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cmiller@zippy.cornsilk.net 2007-10-11 14:37:45 -04:00
parent 91b5c11922
commit 2d615a6169
11 changed files with 1029 additions and 994 deletions
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137
sql/net_serv.cc
View File

@ -13,15 +13,16 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*
/**
@file
This file is the net layer API for the MySQL client/server protocol,
which is a tightly coupled, proprietary protocol owned by MySQL AB.
@note
Any re-implementations of this protocol must also be under GPL
unless one has got an license from MySQL AB stating otherwise.
*/
/*
Write and read of logical packets to/from socket
Write and read of logical packets to/from socket.
Writes are cached into net_buffer_length big packets.
Read packets are reallocated dynamicly when reading big packets.
@ -111,7 +112,7 @@ extern void query_cache_insert(NET *net, const char *packet, ulong length);
static my_bool net_write_buff(NET *net,const uchar *packet,ulong len);
/* Init with packet info */
/** Init with packet info. */
my_bool my_net_init(NET *net, Vio* vio)
{
@ -163,7 +164,7 @@ void net_end(NET *net)
}
/* Realloc the packet buffer */
/** Realloc the packet buffer. */
my_bool net_realloc(NET *net, size_t length)
{
@ -201,20 +202,17 @@ my_bool net_realloc(NET *net, size_t length)
}
/*
Check if there is any data to be read from the socket
/**
Check if there is any data to be read from the socket.
SYNOPSIS
net_data_is_ready()
sd socket descriptor
@param sd socket descriptor
DESCRIPTION
Check if there is any data to be read from the socket.
RETURN VALUES
0 No data to read
1 Data or EOF to read
-1 Don't know if data is ready or not
@retval
0 No data to read
@retval
1 Data or EOF to read
@retval
-1 Don't know if data is ready or not
*/
#if !defined(EMBEDDED_LIBRARY)
@ -258,16 +256,10 @@ static int net_data_is_ready(my_socket sd)
#endif /* EMBEDDED_LIBRARY */
/*
/**
Remove unwanted characters from connection
and check if disconnected
and check if disconnected.
SYNOPSIS
net_clear()
net NET handler
clear_buffer If <> 0, then clear all data from communication buffer
DESCRIPTION
Read from socket until there is nothing more to read. Discard
what is read.
@ -278,6 +270,8 @@ static int net_data_is_ready(my_socket sd)
a FIN packet), then select() considers a socket "ready to read",
in the sense that there's EOF to read, but read() returns 0.
@param net NET handler
@param clear_buffer if <> 0, then clear all data from comm buff
*/
void net_clear(NET *net, my_bool clear_buffer)
@ -335,7 +329,7 @@ void net_clear(NET *net, my_bool clear_buffer)
}
/* Flush write_buffer if not empty. */
/** Flush write_buffer if not empty. */
my_bool net_flush(NET *net)
{
@ -358,12 +352,13 @@ my_bool net_flush(NET *net)
** Write something to server/client buffer
*****************************************************************************/
/*
Write a logical packet with packet header
/**
Write a logical packet with packet header.
Format: Packet length (3 bytes), packet number(1 byte)
When compression is used a 3 byte compression length is added
NOTE
@note
If compression is used the original package is modified!
*/
@ -400,19 +395,9 @@ my_net_write(NET *net,const uchar *packet,size_t len)
return test(net_write_buff(net,packet,len));
}
/*
/**
Send a command to the server.
SYNOPSIS
net_write_command()
net NET handler
command Command in MySQL server (enum enum_server_command)
header Header to write after command
head_len Length of header
packet Query or parameter to query
len Length of packet
DESCRIPTION
The reason for having both header and packet is so that libmysql
can easy add a header to a special command (like prepared statements)
without having to re-alloc the string.
@ -420,11 +405,20 @@ my_net_write(NET *net,const uchar *packet,size_t len)
As the command is part of the first data packet, we have to do some data
juggling to put the command in there, without having to create a new
packet.
This function will split big packets into sub-packets if needed.
(Each sub packet can only be 2^24 bytes)
RETURN VALUES
@param net NET handler
@param command Command in MySQL server (enum enum_server_command)
@param header Header to write after command
@param head_len Length of header
@param packet Query or parameter to query
@param len Length of packet
@retval
0 ok
@retval
1 error
*/
@ -468,33 +462,30 @@ net_write_command(NET *net,uchar command,
net_write_buff(net, packet, len) || net_flush(net)));
}
/*
/**
Caching the data in a local buffer before sending it.
SYNOPSIS
net_write_buff()
net Network handler
packet Packet to send
len Length of packet
DESCRIPTION
Fill up net->buffer and send it to the client when full.
Fill up net->buffer and send it to the client when full.
If the rest of the to-be-sent-packet is bigger than buffer,
send it in one big block (to avoid copying to internal buffer).
If not, copy the rest of the data to the buffer and return without
sending data.
NOTES
The cached buffer can be sent as it is with 'net_flush()'.
@param net Network handler
@param packet Packet to send
@param len Length of packet
@note
The cached buffer can be sent as it is with 'net_flush()'.
In this code we have to be careful to not send a packet longer than
MAX_PACKET_LENGTH to net_real_write() if we are using the compressed
protocol as we store the length of the compressed packet in 3 bytes.
RETURN
0 ok
1
@retval
0 ok
@retval
1
*/
static my_bool
@ -547,9 +538,12 @@ net_write_buff(NET *net, const uchar *packet, ulong len)
}
/*
/**
Read and write one packet using timeouts.
If needed, the packet is compressed before sending.
@todo
- TODO is it needed to set this variable if we have no socket
*/
int
@ -726,18 +720,17 @@ static my_bool net_safe_read(NET *net, uchar *buff, size_t length,
return 0;
}
/*
/**
Help function to clear the commuication buffer when we get a too big packet.
SYNOPSIS
my_net_skip_rest()
net Communication handle
remain Bytes to read
alarmed Parameter for thr_alarm()
alarm_buff Parameter for thr_alarm()
@param net Communication handle
@param remain Bytes to read
@param alarmed Parameter for thr_alarm()
@param alarm_buff Parameter for thr_alarm()
RETURN VALUES
@retval
0 Was able to read the whole packet
@retval
1 Got mailformed packet from client
*/
@ -780,10 +773,13 @@ static my_bool my_net_skip_rest(NET *net, uint32 remain, thr_alarm_t *alarmed,
#endif /* NO_ALARM */
/*
Reads one packet to net->buff + net->where_b
Returns length of packet. Long packets are handled by my_net_read().
/**
Reads one packet to net->buff + net->where_b.
Long packets are handled by my_net_read().
This function reallocates the net->buff buffer if necessary.
@return
Returns length of packet.
*/
static ulong
@ -972,15 +968,18 @@ end:
}
/*
/**
Read a packet from the client/server and return it without the internal
package header.
If the packet is the first packet of a multi-packet packet
(which is indicated by the length of the packet = 0xffffff) then
all sub packets are read and concatenated.
If the packet was compressed, its uncompressed and the length of the
uncompressed packet is returned.
@return
The function returns the length of the found packet or packet_error.
net->read_pos points to the read data.
*/

78
sql/nt_servc.cc
View File

@ -1,8 +1,12 @@
/* ------------------------------------------------------------------------
Windows NT Service class library
Copyright Abandoned 1998 Irena Pancirov - Irnet Snc
This file is public domain and comes with NO WARRANTY of any kind
-------------------------------------------------------------------------- */
/**
@file
@brief
Windows NT Service class library.
Copyright Abandoned 1998 Irena Pancirov - Irnet Snc
This file is public domain and comes with NO WARRANTY of any kind
*/
#include <windows.h>
#include <process.h>
#include <stdio.h>
@ -73,12 +77,13 @@ BOOL NTService::GetOS()
}
/* ------------------------------------------------------------------------
Init() Registers the main service thread with the service manager
/**
Registers the main service thread with the service manager.
@param ServiceThread pointer to the main programs entry function
when the service is started
*/
ServiceThread - pointer to the main programs entry function
when the service is started
-------------------------------------------------------------------------- */
long NTService::Init(LPCSTR szInternName,void *ServiceThread)
{
@ -99,13 +104,15 @@ long NTService::Init(LPCSTR szInternName,void *ServiceThread)
}
/* ------------------------------------------------------------------------
Install() - Installs the service with Service manager
/**
Installs the service with Service manager.
nError values:
0 success
1 Can't open the Service manager
2 Failed to create service
-------------------------------------------------------------------------- */
- 0 success
- 1 Can't open the Service manager
- 2 Failed to create service.
*/
BOOL NTService::Install(int startType, LPCSTR szInternName,
LPCSTR szDisplayName,
@ -155,14 +162,16 @@ BOOL NTService::Install(int startType, LPCSTR szInternName,
}
/* ------------------------------------------------------------------------
Remove() - Removes the service
/**
Removes the service.
nError values:
0 success
1 Can't open the Service manager
2 Failed to locate service
3 Failed to delete service
-------------------------------------------------------------------------- */
- 0 success
- 1 Can't open the Service manager
- 2 Failed to locate service
- 3 Failed to delete service.
*/
BOOL NTService::Remove(LPCSTR szInternName)
{
@ -199,10 +208,10 @@ BOOL NTService::Remove(LPCSTR szInternName)
return ret_value;
}
/* ------------------------------------------------------------------------
Stop() - this function should be called before the app. exits to stop
the service
-------------------------------------------------------------------------- */
/**
this function should be called before the app. exits to stop
the service
*/
void NTService::Stop(void)
{
SetStatus(SERVICE_STOP_PENDING,NO_ERROR, 0, 1, 60000);
@ -210,10 +219,11 @@ void NTService::Stop(void)
SetStatus(SERVICE_STOPPED, NO_ERROR, 0, 1, 1000);
}
/* ------------------------------------------------------------------------
ServiceMain() - This is the function that is called from the
service manager to start the service
-------------------------------------------------------------------------- */
/**
This is the function that is called from the
service manager to start the service.
*/
void NTService::ServiceMain(DWORD argc, LPTSTR *argv)
{
@ -264,9 +274,9 @@ error:
return;
}
/* ------------------------------------------------------------------------
StartService() - starts the appliaction thread
-------------------------------------------------------------------------- */
/**
starts the appliaction thread.
*/
BOOL NTService::StartService()
{

165
sql/opt_sum.cc
View File

@ -14,7 +14,9 @@
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*
/**
@file
Optimising of MIN(), MAX() and COUNT(*) queries without 'group by' clause
by replacing the aggregate expression with a constant.
@ -22,6 +24,7 @@
types of queries are optimised (assuming the table handler supports
the required methods)
@verbatim
SELECT COUNT(*) FROM t1[,t2,t3,...]
SELECT MIN(b) FROM t1 WHERE a=const
SELECT MAX(c) FROM t1 WHERE a=const AND b=const
@ -29,6 +32,7 @@
SELECT MIN(b) FROM t1 WHERE a=const AND b>const
SELECT MIN(b) FROM t1 WHERE a=const AND b BETWEEN const AND const
SELECT MAX(b) FROM t1 WHERE a=const AND b BETWEEN const AND const
@endverbatim
Instead of '<' one can use '<=', '>', '>=' and '=' as well.
Instead of 'a=const' the condition 'a IS NULL' can be used.
@ -36,10 +40,11 @@
If all selected fields are replaced then we will also remove all
involved tables and return the answer without any join. Thus, the
following query will be replaced with a row of two constants:
@verbatim
SELECT MAX(b), MIN(d) FROM t1,t2
WHERE a=const AND b<const AND d>const
@endverbatim
(assuming a index for column d of table t2 is defined)
*/
#include "mysql_priv.h"
@ -83,25 +88,25 @@ static ulonglong get_exact_record_count(TABLE_LIST *tables)
}
/*
/**
Substitutes constants for some COUNT(), MIN() and MAX() functions.
SYNOPSIS
opt_sum_query()
tables list of leaves of join table tree
all_fields All fields to be returned
conds WHERE clause
@param tables list of leaves of join table tree
@param all_fields All fields to be returned
@param conds WHERE clause
NOTE:
@note
This function is only called for queries with sum functions and no
GROUP BY part.
RETURN VALUES
@retval
0 no errors
@retval
1 if all items were resolved
@retval
HA_ERR_KEY_NOT_FOUND on impossible conditions
OR an error number from my_base.h HA_ERR_... if a deadlock or a lock
wait timeout happens, for example
@retval
HA_ERR_... if a deadlock or a lock wait timeout happens, for example
*/
int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
@ -472,19 +477,18 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
}
/*
Test if the predicate compares a field with constants
/**
Test if the predicate compares a field with constants.
SYNOPSIS
simple_pred()
func_item Predicate item
args out: Here we store the field followed by constants
inv_order out: Is set to 1 if the predicate is of the form
'const op field'
@param func_item Predicate item
@param[out] args Here we store the field followed by constants
@param[out] inv_order Is set to 1 if the predicate is of the form
'const op field'
RETURN
@retval
0 func_item is a simple predicate: a field is compared with
constants
constants
@retval
1 Otherwise
*/
@ -556,34 +560,33 @@ bool simple_pred(Item_func *func_item, Item **args, bool *inv_order)
}
/*
Check whether a condition matches a key to get {MAX|MIN}(field):
/**
Check whether a condition matches a key to get {MAX|MIN}(field):.
SYNOPSIS
matching_cond()
max_fl in: Set to 1 if we are optimising MAX()
ref in/out: Reference to the structure we store the key value
keyinfo in Reference to the key info
field_part in: Pointer to the key part for the field
cond in WHERE condition
key_part_used in/out: Map of matchings parts
range_fl in/out: Says whether including key will be used
prefix_len out: Length of common key part for the range
where MAX/MIN is searched for
DESCRIPTION
For the index specified by the keyinfo parameter, index that
contains field as its component (field_part), the function
checks whether the condition cond is a conjunction and all its
conjuncts referring to the columns of the same table as column
field are one of the following forms:
- f_i= const_i or const_i= f_i or f_i is null,
where f_i is part of the index
where f_i is part of the index
- field {<|<=|>=|>|=} const or const {<|<=|>=|>|=} field
- field between const1 and const2
RETURN
@param[in] max_fl Set to 1 if we are optimising MAX()
@param[in,out] ref Reference to the structure we store the key
value
@param[in] keyinfo Reference to the key info
@param[in] field_part Pointer to the key part for the field
@param[in] cond WHERE condition
@param[in,out] key_part_used Map of matchings parts
@param[in,out] range_fl Says whether including key will be used
@param[out] prefix_len Length of common key part for the range
where MAX/MIN is searched for
@retval
0 Index can't be used.
@retval
1 We can use index to get MIN/MAX value
*/
@ -748,31 +751,21 @@ static bool matching_cond(bool max_fl, TABLE_REF *ref, KEY *keyinfo,
}
/*
/**
Check whether we can get value for {max|min}(field) by using a key.
SYNOPSIS
find_key_for_maxmin()
max_fl in: 0 for MIN(field) / 1 for MAX(field)
ref in/out Reference to the structure we store the key value
field in: Field used inside MIN() / MAX()
cond in: WHERE condition
range_fl out: Bit flags for how to search if key is ok
prefix_len out: Length of prefix for the search range
If where-condition is not a conjunction of 0 or more conjuct the
function returns false, otherwise it checks whether there is an
index including field as its k-th component/part such that:
DESCRIPTION
If where condition is not a conjunction of 0 or more conjuct the
function returns false, otherwise it checks whether there is an
index including field as its k-th component/part such that:
1. for each previous component f_i there is one and only one conjunct
-# for each previous component f_i there is one and only one conjunct
of the form: f_i= const_i or const_i= f_i or f_i is null
2. references to field occur only in conjucts of the form:
-# references to field occur only in conjucts of the form:
field {<|<=|>=|>|=} const or const {<|<=|>=|>|=} field or
field BETWEEN const1 AND const2
3. all references to the columns from the same table as column field
-# all references to the columns from the same table as column field
occur only in conjucts mentioned above.
4. each of k first components the index is not partial, i.e. is not
-# each of k first components the index is not partial, i.e. is not
defined on a fixed length proper prefix of the field.
If such an index exists the function through the ref parameter
@ -780,17 +773,26 @@ static bool matching_cond(bool max_fl, TABLE_REF *ref, KEY *keyinfo,
the length of first (k-1) components of the key and flags saying
how to apply the key for the search max/min value.
(if we have a condition field = const, prefix_len contains the length
of the whole search key)
of the whole search key)
NOTE
@param[in] max_fl 0 for MIN(field) / 1 for MAX(field)
@param[in,out] ref Reference to the structure we store the key value
@param[in] field Field used inside MIN() / MAX()
@param[in] cond WHERE condition
@param[out] range_fl Bit flags for how to search if key is ok
@param[out] prefix_len Length of prefix for the search range
@note
This function may set table->key_read to 1, which must be reset after
index is used! (This can only happen when function returns 1)
RETURN
@retval
0 Index can not be used to optimize MIN(field)/MAX(field)
1 Can use key to optimize MIN()/MAX()
In this case ref, range_fl and prefix_len are updated
*/
@retval
1 Can use key to optimize MIN()/MAX().
In this case ref, range_fl and prefix_len are updated
*/
static bool find_key_for_maxmin(bool max_fl, TABLE_REF *ref,
Field* field, COND *cond,
@ -883,20 +885,19 @@ static bool find_key_for_maxmin(bool max_fl, TABLE_REF *ref,
}
/*
Check whether found key is in range specified by conditions
/**
Check whether found key is in range specified by conditions.
SYNOPSIS
reckey_in_range()
max_fl in: 0 for MIN(field) / 1 for MAX(field)
ref in: Reference to the key value and info
field in: Field used the MIN/MAX expression
cond in: WHERE condition
range_fl in: Says whether there is a condition to to be checked
prefix_len in: Length of the constant part of the key
@param[in] max_fl 0 for MIN(field) / 1 for MAX(field)
@param[in] ref Reference to the key value and info
@param[in] field Field used the MIN/MAX expression
@param[in] cond WHERE condition
@param[in] range_fl Says whether there is a condition to to be checked
@param[in] prefix_len Length of the constant part of the key
RETURN
@retval
0 ok
@retval
1 WHERE was not true for the found row
*/
@ -911,16 +912,16 @@ static int reckey_in_range(bool max_fl, TABLE_REF *ref, Field* field,
}
/*
Check whether {MAX|MIN}(field) is in range specified by conditions
SYNOPSIS
maxmin_in_range()
max_fl in: 0 for MIN(field) / 1 for MAX(field)
field in: Field used the MIN/MAX expression
cond in: WHERE condition
/**
Check whether {MAX|MIN}(field) is in range specified by conditions.
RETURN
@param[in] max_fl 0 for MIN(field) / 1 for MAX(field)
@param[in] field Field used the MIN/MAX expression
@param[in] cond WHERE condition
@retval
0 ok
@retval
1 WHERE was not true for the found row
*/

288
sql/parse_file.cc
View File

@ -13,7 +13,12 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
// Text .frm files management routines
/**
@file
@brief
Text .frm files management routines
*/
#include "mysql_priv.h"
#include <errno.h>
@ -22,17 +27,16 @@
#include <my_dir.h>
/*
write string with escaping
/**
Write string with escaping.
SYNOPSIS
write_escaped_string()
file - IO_CACHE for record
val_s - string for writing
@param file IO_CACHE for record
@param val_s string for writing
RETURN
FALSE - OK
TRUE - error
@retval
FALSE OK
@retval
TRUE error
*/
static my_bool
@ -77,21 +81,21 @@ write_escaped_string(IO_CACHE *file, LEX_STRING *val_s)
}
/*
write parameter value to IO_CACHE
/**
Write parameter value to IO_CACHE.
SYNOPSIS
write_parameter()
file pointer to IO_CACHE structure for writing
base pointer to data structure
parameter pointer to parameter descriptor
old_version for returning back old version number value
@param file pointer to IO_CACHE structure for writing
@param base pointer to data structure
@param parameter pointer to parameter descriptor
@param old_version for returning back old version number value
RETURN
FALSE - OK
TRUE - error
@retval
FALSE OK
@retval
TRUE error
*/
static my_bool
write_parameter(IO_CACHE *file, uchar* base, File_option *parameter,
ulonglong *old_version)
@ -191,24 +195,24 @@ write_parameter(IO_CACHE *file, uchar* base, File_option *parameter,
}
/*
write new .frm
/**
Write new .frm.
SYNOPSIS
sql_create_definition_file()
dir directory where put .frm
file .frm file name
type .frm type string (VIEW, TABLE)
base base address for parameter reading (structure like
TABLE)
parameters parameters description
max_versions number of versions to save
@param dir directory where put .frm
@param file_name .frm file name
@param type .frm type string (VIEW, TABLE)
@param base base address for parameter reading (structure like
TABLE)
@param parameters parameters description
@param max_versions number of versions to save
RETURN
FALSE - OK
TRUE - error
@retval
FALSE OK
@retval
TRUE error
*/
my_bool
sql_create_definition_file(const LEX_STRING *dir, const LEX_STRING *file_name,
const LEX_STRING *type,
@ -345,21 +349,19 @@ err_w_file:
DBUG_RETURN(TRUE);
}
/*
Renames a frm file (including backups) in same schema
/**
Renames a frm file (including backups) in same schema.
SYNOPSIS
rename_in_schema_file
schema name of given schema
old_name original file name
new_name new file name
revision revision number
num_view_backups number of backups
RETURN
0 - OK
1 - Error (only if renaming of frm failed)
@param schema name of given schema
@param old_name original file name
@param new_name new file name
@param revision revision number
@param num_view_backups number of backups
@retval
0 OK
@retval
1 Error (only if renaming of frm failed)
*/
my_bool rename_in_schema_file(const char *schema, const char *old_name,
const char *new_name, ulonglong revision,
@ -401,21 +403,20 @@ my_bool rename_in_schema_file(const char *schema, const char *old_name,
return 0;
}
/*
Prepare frm to parse (read to memory)
/**
Prepare frm to parse (read to memory).
SYNOPSIS
sql_parse_prepare()
file_name - path & filename to .frm file
mem_root - MEM_ROOT for buffer allocation
bad_format_errors - send errors on bad content
@param file_name path & filename to .frm file
@param mem_root MEM_ROOT for buffer allocation
@param bad_format_errors send errors on bad content
RETURN
0 - error
parser object
NOTE
@note
returned pointer + 1 will be type of .frm
@return
0 - error
@return
parser object
*/
File_parser *
@ -506,22 +507,22 @@ frm_error:
}
/*
parse LEX_STRING
/**
parse LEX_STRING.
SYNOPSIS
parse_string()
ptr - pointer on string beginning
end - pointer on symbol after parsed string end (still owned
by buffer and can be accessed
mem_root - MEM_ROOT for parameter allocation
str - pointer on string, where results should be stored
@param ptr pointer on string beginning
@param end pointer on symbol after parsed string end (still owned
by buffer and can be accessed
@param mem_root MEM_ROOT for parameter allocation
@param str pointer on string, where results should be stored
RETURN
0 - error
# - pointer on symbol after string
@retval
0 error
@retval
\# pointer on symbol after string
*/
static char *
parse_string(char *ptr, char *end, MEM_ROOT *mem_root, LEX_STRING *str)
{
@ -539,18 +540,17 @@ parse_string(char *ptr, char *end, MEM_ROOT *mem_root, LEX_STRING *str)
}
/*
read escaped string from ptr to eol in already allocated str
/**
read escaped string from ptr to eol in already allocated str.
SYNOPSIS
read_escaped_string()
ptr - pointer on string beginning
eol - pointer on character after end of string
str - target string
@param ptr pointer on string beginning
@param eol pointer on character after end of string
@param str target string
RETURN
FALSE - OK
TRUE - error
@retval
FALSE OK
@retval
TRUE error
*/
my_bool
@ -598,22 +598,22 @@ read_escaped_string(char *ptr, char *eol, LEX_STRING *str)
}
/*
parse \n delimited escaped string
/**
parse \\n delimited escaped string.
SYNOPSIS
parse_escaped_string()
ptr - pointer on string beginning
end - pointer on symbol after parsed string end (still owned
by buffer and can be accessed
mem_root - MEM_ROOT for parameter allocation
str - pointer on string, where results should be stored
@param ptr pointer on string beginning
@param end pointer on symbol after parsed string end (still owned
by buffer and can be accessed
@param mem_root MEM_ROOT for parameter allocation
@param str pointer on string, where results should be stored
RETURN
0 - error
# - pointer on symbol after string
@retval
0 error
@retval
\# pointer on symbol after string
*/
char *
parse_escaped_string(char *ptr, char *end, MEM_ROOT *mem_root, LEX_STRING *str)
{
@ -628,20 +628,19 @@ parse_escaped_string(char *ptr, char *end, MEM_ROOT *mem_root, LEX_STRING *str)
}
/*
parse '' delimited escaped string
/**
parse '' delimited escaped string.
SYNOPSIS
parse_quoted_escaped_string()
ptr - pointer on string beginning
end - pointer on symbol after parsed string end (still owned
by buffer and can be accessed
mem_root - MEM_ROOT for parameter allocation
str - pointer on string, where results should be stored
@param ptr pointer on string beginning
@param end pointer on symbol after parsed string end (still owned
by buffer and can be accessed
@param mem_root MEM_ROOT for parameter allocation
@param str pointer on string, where results should be stored
RETURN
0 - error
# - pointer on symbol after string
@retval
0 error
@retval
\# pointer on symbol after string
*/
static char *
@ -673,18 +672,16 @@ parse_quoted_escaped_string(char *ptr, char *end,
}
/*
/**
Parser for FILE_OPTIONS_ULLLIST type value.
SYNOPSIS
get_file_options_ulllist()
ptr [in/out] pointer to parameter
end [in] end of the configuration
line [in] pointer to the line begining
base [in] base address for parameter writing (structure
like TABLE)
parameter [in] description
mem_root [in] MEM_ROOT for parameters allocation
@param[in,out] ptr pointer to parameter
@param[in] end end of the configuration
@param[in] line pointer to the line begining
@param[in] base base address for parameter writing (structure
like TABLE)
@param[in] parameter description
@param[in] mem_root MEM_ROOT for parameters allocation
*/
bool get_file_options_ulllist(char *&ptr, char *end, char *line,
@ -728,28 +725,28 @@ nlist_err:
}
/*
parse parameters
/**
parse parameters.
SYNOPSIS
File_parser::parse()
base base address for parameter writing (structure like
TABLE)
mem_root MEM_ROOT for parameters allocation
parameters parameters description
required number of parameters in the above list. If the file
contains more parameters than "required", they will
be ignored. If the file contains less parameters
then "required", non-existing parameters will
remain their values.
hook hook called for unknown keys
hook_data some data specific for the hook
@param base base address for parameter writing (structure like
TABLE)
@param mem_root MEM_ROOT for parameters allocation
@param parameters parameters description
@param required number of required parameters in above list. If the file
contains more parameters than "required", they will
be ignored. If the file contains less parameters
then "required", non-existing parameters will
remain their values.
@param hook hook called for unknown keys
@param hook_data some data specific for the hook
RETURN
FALSE - OK
TRUE - error
@retval
FALSE OK
@retval
TRUE error
*/
my_bool
File_parser::parse(uchar* base, MEM_ROOT *mem_root,
struct File_option *parameters, uint required,
@ -935,26 +932,25 @@ list_err:
}
/*
Dummy unknown key hook
/**
Dummy unknown key hook.
SYNOPSIS
File_parser_dummy_hook::process_unknown_string()
unknown_key [in/out] reference on the line with unknown
parameter and the parsing point
base [in] base address for parameter writing (structure like
TABLE)
mem_root [in] MEM_ROOT for parameters allocation
end [in] the end of the configuration
@param[in,out] unknown_key reference on the line with unknown
parameter and the parsing point
@param[in] base base address for parameter writing
(structure like TABLE)
@param[in] mem_root MEM_ROOT for parameters allocation
@param[in] end the end of the configuration
NOTE
@note
This hook used to catch no longer supported keys and process them for
backward compatibility, but it will not slow down processing of modern
format files.
This hook does nothing except debug output.
RETURN
@retval
FALSE OK
@retval
TRUE Error
*/

11
sql/procedure.cc
View File

@ -68,10 +68,13 @@ my_decimal *Item_proc_real::val_decimal(my_decimal *decimal_value)
}
/*****************************************************************************
** Setup handling of procedure
** Return 0 if everything is ok
*****************************************************************************/
/**
Setup handling of procedure.
@return
Return 0 if everything is ok
*/
Procedure *
setup_procedure(THD *thd,ORDER *param,select_result *result,

212
sql/protocol.cc
View File

@ -13,8 +13,10 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*
Low level functions for storing data to be send to the MySQL client
/**
@file
Low level functions for storing data to be send to the MySQL client.
The actual communction is handled by the net_xxx functions in net_serv.cc
*/
@ -53,17 +55,18 @@ bool Protocol_binary::net_store_data(const uchar *from, size_t length)
}
/*
Send a error string to client
/**
Send a error string to client.
Design note:
Design note:
net_printf_error and net_send_error are low-level functions
that shall be used only when a new connection is being
established or at server startup.
For SIGNAL/RESIGNAL and GET DIAGNOSTICS functionality it's
critical that every error that can be intercepted is issued in one
place only, my_message_sql.
net_printf_error and net_send_error are low-level functions
that shall be used only when a new connection is being
established or at server startup.
For SIGNAL/RESIGNAL and GET DIAGNOSTICS functionality it's
critical that every error that can be intercepted is issued in one
place only, my_message_sql.
*/
void net_send_error(THD *thd, uint sql_errno, const char *err)
{
@ -120,19 +123,22 @@ void net_send_error(THD *thd, uint sql_errno, const char *err)
DBUG_VOID_RETURN;
}
/*
Write error package and flush to client
It's a little too low level, but I don't want to use another buffer for
this
/**
Write error package and flush to client.
Design note:
@note
It's a little too low level, but I don't want to use another buffer for
this.
net_printf_error and net_send_error are low-level functions
that shall be used only when a new connection is being
established or at server startup.
For SIGNAL/RESIGNAL and GET DIAGNOSTICS functionality it's
critical that every error that can be intercepted is issued in one
place only, my_message_sql.
Design note:
net_printf_error and net_send_error are low-level functions
that shall be used only when a new connection is being
established or at server startup.
For SIGNAL/RESIGNAL and GET DIAGNOSTICS functionality it's
critical that every error that can be intercepted is issued in one
place only, my_message_sql.
*/
void
@ -239,31 +245,28 @@ net_printf_error(THD *thd, uint errcode, ...)
DBUG_VOID_RETURN;
}
/*
/**
Return ok to the client.
SYNOPSIS
send_ok()
thd Thread handler
affected_rows Number of rows changed by statement
id Auto_increment id for first row (if used)
message Message to send to the client (Used by mysql_status)
The ok packet has the following structure:
DESCRIPTION
The ok packet has the following structure
- 0 : Marker (1 byte)
- affected_rows : Stored in 1-9 bytes
- id : Stored in 1-9 bytes
- server_status : Copy of thd->server_status; Can be used by client
to check if we are inside an transaction.
New in 4.0 protocol
- warning_count : Stored in 2 bytes; New in 4.1 protocol
- message : Stored as packed length (1-9 bytes) + message.
Is not stored if no message.
0 Marker (1 byte)
affected_rows Stored in 1-9 bytes
id Stored in 1-9 bytes
server_status Copy of thd->server_status; Can be used by client
to check if we are inside an transaction
New in 4.0 protocol
warning_count Stored in 2 bytes; New in 4.1 protocol
message Stored as packed length (1-9 bytes) + message
Is not stored if no message
If net->no_send_ok return without sending packet.
If net->no_send_ok return without sending packet
*/
@param thd Thread handler
@param affected_rows Number of rows changed by statement
@param id Auto_increment id for first row (if used)
@param message Message to send to the client (Used by mysql_status)
*/
#ifndef EMBEDDED_LIBRARY
void
@ -319,27 +322,24 @@ send_ok(THD *thd, ha_rows affected_rows, ulonglong id, const char *message)
static uchar eof_buff[1]= { (uchar) 254 }; /* Marker for end of fields */
/*
Send eof (= end of result set) to the client
/**
Send eof (= end of result set) to the client.
SYNOPSIS
send_eof()
thd Thread handler
no_flush Set to 1 if there will be more data to the client,
like in send_fields().
The eof packet has the following structure:
DESCRIPTION
The eof packet has the following structure
- 254 : Marker (1 byte)
- warning_count : Stored in 2 bytes; New in 4.1 protocol
- status_flag : Stored in 2 bytes;
For flags like SERVER_MORE_RESULTS_EXISTS.
254 Marker (1 byte)
warning_count Stored in 2 bytes; New in 4.1 protocol
status_flag Stored in 2 bytes;
For flags like SERVER_MORE_RESULTS_EXISTS
Note that the warning count will not be sent if 'no_flush' is set as
we don't want to report the warning count until all data is sent to the
client.
Note that the warning count will not be sent if 'no_flush' is set as
we don't want to report the warning count until all data is sent to the
client.
*/
@param thd Thread handler
@param no_flush Set to 1 if there will be more data to the client,
like in send_fields().
*/
void
send_eof(THD *thd)
@ -357,7 +357,7 @@ send_eof(THD *thd)
}
/*
/**
Format EOF packet according to the current protocol and
write it to the network output buffer.
*/
@ -388,15 +388,15 @@ static void write_eof_packet(THD *thd, NET *net)
VOID(my_net_write(net, eof_buff, 1));
}
/*
Please client to send scrambled_password in old format.
SYNOPSYS
send_old_password_request()
thd thread handle
RETURN VALUE
0 ok
!0 error
/**
Please client to send scrambled_password in old format.
@param thd thread handle
@retval
0 ok
@retval
!0 error
*/
bool send_old_password_request(THD *thd)
@ -450,14 +450,15 @@ void net_send_error_packet(THD *thd, uint sql_errno, const char *err)
#endif /* EMBEDDED_LIBRARY */
/*
/**
Faster net_store_length when we know that length is less than 65536.
We keep a separate version for that range because it's widely used in
libmysql.
uint is used as agrument type because of MySQL type conventions:
uint for 0..65536
ulong for 0..4294967296
ulonglong for bigger numbers.
- uint for 0..65536
- ulong for 0..4294967296
- ulonglong for bigger numbers.
*/
static uchar *net_store_length_fast(uchar *packet, uint length)
@ -530,27 +531,26 @@ bool Protocol::flush()
#endif
}
/*
#ifndef EMBEDDED_LIBRARY
/**
Send name and type of result to client.
SYNOPSIS
send_fields()
THD Thread data object
list List of items to send to client
flag Bit mask with the following functions:
1 send number of rows
2 send default values
4 don't write eof packet
Sum fields has table name empty and field_name.
DESCRIPTION
Sum fields has table name empty and field_name.
@param THD Thread data object
@param list List of items to send to client
@param flag Bit mask with the following functions:
- 1 send number of rows
- 2 send default values
- 4 don't write eof packet
RETURN VALUES
@retval
0 ok
1 Error (Note that in this case the error is not sent to the client)
@retval
1 Error (Note that in this case the error is not sent to the
client)
*/
#ifndef EMBEDDED_LIBRARY
bool Protocol::send_fields(List<Item> *list, uint flags)
{
List_iterator_fast<Item> it(*list);
@ -704,18 +704,17 @@ bool Protocol::write()
#endif /* EMBEDDED_LIBRARY */
/*
Send \0 end terminated string
/**
Send \\0 end terminated string.
SYNOPSIS
store()
from NullS or \0 terminated string
@param from NullS or \\0 terminated string
NOTES
@note
In most cases one should use store(from, length) instead of this function
RETURN VALUES
@retval
0 ok
@retval
1 error
*/
@ -728,8 +727,8 @@ bool Protocol::store(const char *from, CHARSET_INFO *cs)
}
/*
Send a set of strings as one long string with ',' in between
/**
Send a set of strings as one long string with ',' in between.
*/
bool Protocol::store(I_List<i_string>* str_list)
@ -781,7 +780,7 @@ bool Protocol_text::store_null()
#endif
/*
/**
Auxilary function to convert string to the given character set
and store in network buffer.
*/
@ -957,13 +956,12 @@ bool Protocol_text::store(Field *field)
}
/*
TODO:
Second_part format ("%06") needs to change when
we support 0-6 decimals for time.
/**
@todo
Second_part format ("%06") needs to change when
we support 0-6 decimals for time.
*/
bool Protocol_text::store(MYSQL_TIME *tm)
{
#ifndef DBUG_OFF
@ -1001,10 +999,10 @@ bool Protocol_text::store_date(MYSQL_TIME *tm)
}
/*
TODO:
Second_part format ("%06") needs to change when
we support 0-6 decimals for time.
/**
@todo
Second_part format ("%06") needs to change when
we support 0-6 decimals for time.
*/
bool Protocol_text::store_time(MYSQL_TIME *tm)

127
sql/records.cc
View File

@ -14,7 +14,12 @@
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* Functions for easy reading of records, possible through a cache */
/**
@file
@brief
Functions for easy reading of records, possible through a cache
*/
#include "mysql_priv.h"
@ -31,25 +36,20 @@ static int rr_index_first(READ_RECORD *info);
static int rr_index(READ_RECORD *info);
/*
Initialize READ_RECORD structure to perform full index scan
/**
Initialize READ_RECORD structure to perform full index scan (in forward
direction) using read_record.read_record() interface.
SYNOPSIS
init_read_record_idx()
info READ_RECORD structure to initialize.
thd Thread handle
table Table to be accessed
print_error If true, call table->file->print_error() if an error
occurs (except for end-of-records error)
idx index to scan
DESCRIPTION
Initialize READ_RECORD structure to perform full index scan (in forward
direction) using read_record.read_record() interface.
This function has been added at late stage and is used only by
UPDATE/DELETE. Other statements perform index scans using
join_read_first/next functions.
@param info READ_RECORD structure to initialize.
@param thd Thread handle
@param table Table to be accessed
@param print_error If true, call table->file->print_error() if an error
occurs (except for end-of-records error)
@param idx index to scan
*/
void init_read_record_idx(READ_RECORD *info, THD *thd, TABLE *table,
@ -284,7 +284,7 @@ static int rr_handle_error(READ_RECORD *info, int error)
}
/* Read a record from head-database */
/** Read a record from head-database. */
static int rr_quick(READ_RECORD *info)
{
@ -306,20 +306,19 @@ static int rr_quick(READ_RECORD *info)
}
/*
Reads first row in an index scan
/**
Reads first row in an index scan.
SYNOPSIS
rr_index_first()
info Scan info
RETURN
@param info Scan info
@retval
0 Ok
-1 End of records
1 Error
@retval
-1 End of records
@retval
1 Error
*/
static int rr_index_first(READ_RECORD *info)
{
int tmp= info->file->index_first(info->record);
@ -330,24 +329,22 @@ static int rr_index_first(READ_RECORD *info)
}
/*
Reads index sequentially after first row
/**
Reads index sequentially after first row.
SYNOPSIS
rr_index()
info Scan info
DESCRIPTION
Read the next index record (in forward direction) and translate return
value.
RETURN
Read the next index record (in forward direction) and translate return
value.
@param info Scan info
@retval
0 Ok
-1 End of records
1 Error
@retval
-1 End of records
@retval
1 Error
*/
static int rr_index(READ_RECORD *info)
{
int tmp= info->file->index_next(info->record);
@ -401,22 +398,20 @@ static int rr_from_tempfile(READ_RECORD *info)
} /* rr_from_tempfile */
/*
Read a result set record from a temporary file after sorting
/**
Read a result set record from a temporary file after sorting.
SYNOPSIS
rr_unpack_from_tempfile()
info Reference to the context including record descriptors
The function first reads the next sorted record from the temporary file.
into a buffer. If a success it calls a callback function that unpacks
the fields values use in the result set from this buffer into their
positions in the regular record buffer.
DESCRIPTION
The function first reads the next sorted record from the temporary file.
into a buffer. If a success it calls a callback function that unpacks
the fields values use in the result set from this buffer into their
positions in the regular record buffer.
@param info Reference to the context including record descriptors
RETURN
0 - Record successfully read.
-1 - There is no record to be read anymore.
@retval
0 Record successfully read.
@retval
-1 There is no record to be read anymore.
*/
static int rr_unpack_from_tempfile(READ_RECORD *info)
@ -454,22 +449,20 @@ static int rr_from_pointers(READ_RECORD *info)
return tmp;
}
/*
Read a result set record from a buffer after sorting
/**
Read a result set record from a buffer after sorting.
SYNOPSIS
rr_unpack_from_buffer()
info Reference to the context including record descriptors
The function first reads the next sorted record from the sort buffer.
If a success it calls a callback function that unpacks
the fields values use in the result set from this buffer into their
positions in the regular record buffer.
DESCRIPTION
The function first reads the next sorted record from the sort buffer.
If a success it calls a callback function that unpacks
the fields values use in the result set from this buffer into their
positions in the regular record buffer.
@param info Reference to the context including record descriptors
RETURN
0 - Record successfully read.
-1 - There is no record to be read anymore.
@retval
0 Record successfully read.
@retval
-1 There is no record to be read anymore.
*/
static int rr_unpack_from_buffer(READ_RECORD *info)

63
sql/repl_failsafe.cc
View File

@ -13,6 +13,16 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/**
@file
All of the functions defined in this file which are not used (the ones to
handle failsafe) are not used; their code has not been updated for more
than one year now so should be considered as BADLY BROKEN. Do not enable
it. The used functions (to handle LOAD DATA FROM MASTER, plus some small
functions like register_slave()) are working.
*/
#include "mysql_priv.h"
#ifdef HAVE_REPLICATION
@ -144,12 +154,13 @@ void unregister_slave(THD* thd, bool only_mine, bool need_mutex)
}
/*
Register slave in 'slave_list' hash table
/**
Register slave in 'slave_list' hash table.
RETURN VALUES
0 ok
1 Error. Error message sent to client
@return
0 ok
@return
1 Error. Error message sent to client
*/
int register_slave(THD* thd, uchar* packet, uint packet_length)
@ -252,7 +263,8 @@ static int find_target_pos(LEX_MASTER_INFO *mi, IO_CACHE *log, char *errmsg)
/* Impossible */
}
/*
/**
@details
Before 4.0.15 we had a member of THD called log_pos, it was meant for
failsafe replication code in repl_failsafe.cc which is disabled until
it is reworked. Event's log_pos used to be preserved through
@ -388,8 +400,8 @@ err:
}
/*
Caller must delete result when done
/**
Caller must delete result when done.
*/
static Slave_log_event* find_slave_event(IO_CACHE* log,
@ -428,9 +440,11 @@ static Slave_log_event* find_slave_event(IO_CACHE* log,
return (Slave_log_event*)ev;
}
/*
This function is broken now. See comment for translate_master().
*/
/**
This function is broken now.
@seealso translate_master()
*/
bool show_new_master(THD* thd)
{
@ -466,20 +480,19 @@ bool show_new_master(THD* thd)
}
}
/*
/**
Asks the master for the list of its other connected slaves.
This is for failsafe replication:
This is for failsafe replication:
in order for failsafe replication to work, the servers involved in
replication must know of each other. We accomplish this by having each
slave report to the master how to reach it, and on connection, each
slave receives information about where the other slaves are.
SYNOPSIS
update_slave_list()
mysql pre-existing connection to the master
mi master info
@param mysql pre-existing connection to the master
@param mi master info
NOTES
@note
mi is used only to give detailed error messages which include the
hostname/port of the master, the username used by the slave to connect to
the master.
@ -487,10 +500,11 @@ bool show_new_master(THD* thd)
REPLICATION SLAVE privilege, it will pop in this function because
SHOW SLAVE HOSTS will fail on the master.
RETURN VALUES
@retval
1 error
@retval
0 success
*/
*/
int update_slave_list(MYSQL* mysql, Master_info* mi)
{
@ -754,11 +768,16 @@ static int fetch_db_tables(THD *thd, MYSQL *mysql, const char *db,
return 0;
}
/*
/**
Load all MyISAM tables from master to this slave.
REQUIREMENTS
- No active transaction (flush_relay_log_info would not work in this case)
- No active transaction (flush_relay_log_info would not work in this case).
@todo
- add special option, not enabled
by default, to allow inclusion of mysql database into load
data from master
*/
bool load_master_data(THD* thd)

196
sql/set_var.cc
View File

@ -13,9 +13,13 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*
/**
@file
@brief
Handling of MySQL SQL variables
@details
To add a new variable, one has to do the following:
- Use one of the 'sys_var... classes from set_var.h or write a specific
@ -28,18 +32,19 @@
- Don't forget to initialize new fields in global_system_variables and
max_system_variables!
NOTES:
- Be careful with var->save_result: sys_var::check() only updates
@todo
Add full support for the variable character_set (for 4.1)
@todo
When updating myisam_delay_key_write, we should do a 'flush tables'
of all MyISAM tables to ensure that they are reopen with the
new attribute.
@note
Be careful with var->save_result: sys_var::check() only updates
ulonglong_value; so other members of the union are garbage then; to use
them you must first assign a value to them (in specific ::check() for
example).
TODO:
- Add full support for the variable character_set (for 4.1)
- When updating myisam_delay_key_write, we should do a 'flush tables'
of all MyISAM tables to ensure that they are reopen with the
new attribute.
*/
#ifdef USE_PRAGMA_IMPLEMENTATION
@ -819,9 +824,9 @@ static void sys_default_ftb_syntax(THD *thd, enum_var_type type)
}
/*
/**
If one sets the LOW_PRIORIY UPDATES flag, we also must change the
used lock type
used lock type.
*/
static void fix_low_priority_updates(THD *thd, enum_var_type type)
@ -843,8 +848,8 @@ fix_myisam_max_sort_file_size(THD *thd, enum_var_type type)
(my_off_t) global_system_variables.myisam_max_sort_file_size;
}
/*
Set the OPTION_BIG_SELECTS flag if max_join_size == HA_POS_ERROR
/**
Set the OPTION_BIG_SELECTS flag if max_join_size == HA_POS_ERROR.
*/
static void fix_max_join_size(THD *thd, enum_var_type type)
@ -859,7 +864,7 @@ static void fix_max_join_size(THD *thd, enum_var_type type)
}
/*
/**
Can't change the 'next' tx_isolation while we are already in
a transaction
*/
@ -875,7 +880,7 @@ static int check_tx_isolation(THD *thd, set_var *var)
/*
If one doesn't use the SESSION modifier, the isolation level
is only active for the next command
is only active for the next command.
*/
static void fix_tx_isolation(THD *thd, enum_var_type type)
{
@ -1447,9 +1452,12 @@ err:
}
/*
Return an Item for a variable. Used with @@[global.]variable_name
If type is not given, return local value if exists, else global
/**
Return an Item for a variable.
Used with @@[global.]variable_name.
If type is not given, return local value if exists, else global.
*/
Item *sys_var::item(THD *thd, enum_var_type var_type, LEX_STRING *base)
@ -1611,7 +1619,7 @@ uchar *sys_var_thd_bit::value_ptr(THD *thd, enum_var_type type,
}
/* Update a date_time format variable based on given value */
/** Update a date_time format variable based on given value. */
void sys_var_thd_date_time_format::update2(THD *thd, enum_var_type type,
DATE_TIME_FORMAT *new_value)
@ -2028,6 +2036,12 @@ end:
}
/**
@todo
Abort if some other thread is changing the key cache.
This should be changed so that we wait until the previous
assignment is done and then do the new assign
*/
bool sys_var_key_cache_long::update(THD *thd, set_var *var)
{
ulong tmp= (ulong) var->value->val_int();
@ -2720,23 +2734,20 @@ static uchar *get_error_count(THD *thd)
}
/*
Get the tmpdir that was specified or chosen by default
/**
Get the tmpdir that was specified or chosen by default.
SYNOPSIS
get_tmpdir()
thd thread handle
This is necessary because if the user does not specify a temporary
directory via the command line, one is chosen based on the environment
or system defaults. But we can't just always use mysql_tmpdir, because
that is actually a call to my_tmpdir() which cycles among possible
temporary directories.
DESCRIPTION
This is necessary because if the user does not specify a temporary
directory via the command line, one is chosen based on the environment
or system defaults. But we can't just always use mysql_tmpdir, because
that is actually a call to my_tmpdir() which cycles among possible
temporary directories.
@param thd thread handle
RETURN VALUES
@retval
ptr pointer to NUL-terminated string
*/
*/
static uchar *get_tmpdir(THD *thd)
{
if (opt_mysql_tmpdir)
@ -2751,16 +2762,16 @@ static uchar *get_tmpdir(THD *thd)
- Update loop
****************************************************************************/
/*
Find variable name in option my_getopt structure used for command line args
/**
Find variable name in option my_getopt structure used for
command line args.
SYNOPSIS
find_option()
opt option structure array to search in
name variable name
@param opt option structure array to search in
@param name variable name
RETURN VALUES
@retval
0 Error
@retval
ptr pointer to option structure
*/
@ -2783,8 +2794,8 @@ static struct my_option *find_option(struct my_option *opt, const char *name)
}
/*
Return variable name and length for hashing of variables
/**
Return variable name and length for hashing of variables.
*/
static uchar *get_sys_var_length(const sys_var *var, size_t *length,
@ -2986,17 +2997,17 @@ int mysql_append_static_vars(const SHOW_VAR *show_vars, uint count)
}
/*
Find a user set-table variable
/**
Find a user set-table variable.
SYNOPSIS
intern_find_sys_var()
str Name of system variable to find
length Length of variable. zero means that we should use strlen()
on the variable
@param str Name of system variable to find
@param length Length of variable. zero means that we should use strlen()
on the variable
@param no_error Refuse to emit an error, even if one occurred.
RETURN VALUES
@retval
pointer pointer to variable definitions
@retval
0 Unknown variable (error message is given)
*/
@ -3017,25 +3028,23 @@ sys_var *intern_find_sys_var(const char *str, uint length, bool no_error)
}
/*
Execute update of all variables
/**
Execute update of all variables.
SYNOPSIS
First run a check of all variables that all updates will go ok.
If yes, then execute all updates, returning an error if any one failed.
sql_set
THD Thread id
set_var List of variables to update
This should ensure that in all normal cases none all or variables are
updated.
DESCRIPTION
First run a check of all variables that all updates will go ok.
If yes, then execute all updates, returning an error if any one failed.
@param THD Thread id
@param var_list List of variables to update
This should ensure that in all normal cases none all or variables are
updated
RETURN VALUE
@retval
0 ok
@retval
1 ERROR, message sent (normally no variables was updated)
@retval
-1 ERROR, message not sent
*/
@ -3064,20 +3073,19 @@ err:
}
/*
Say if all variables set by a SET support the ONE_SHOT keyword (currently,
only character set and collation do; later timezones will).
/**
Say if all variables set by a SET support the ONE_SHOT keyword
(currently, only character set and collation do; later timezones
will).
SYNOPSIS
@param var_list List of variables to update
not_all_support_one_shot
set_var List of variables to update
NOTES
@note
It has a "not_" because it makes faster tests (no need to "!")
RETURN VALUE
@retval
0 all variables of the list support ONE_SHOT
@retval
1 at least one does not support ONE_SHOT
*/
@ -3136,17 +3144,17 @@ int set_var::check(THD *thd)
}
/*
Check variable, but without assigning value (used by PS)
/**
Check variable, but without assigning value (used by PS).
SYNOPSIS
set_var::light_check()
thd thread handler
@param thd thread handler
RETURN VALUE
@retval
0 ok
@retval
1 ERROR, message sent (normally no variables was updated)
-1 ERROR, message not sent
@retval
-1 ERROR, message not sent
*/
int set_var::light_check(THD *thd)
{
@ -3193,17 +3201,17 @@ int set_var_user::check(THD *thd)
}
/*
Check variable, but without assigning value (used by PS)
/**
Check variable, but without assigning value (used by PS).
SYNOPSIS
set_var_user::light_check()
thd thread handler
@param thd thread handler
RETURN VALUE
@retval
0 ok
@retval
1 ERROR, message sent (normally no variables was updated)
-1 ERROR, message not sent
@retval
-1 ERROR, message not sent
*/
int set_var_user::light_check(THD *thd)
{
@ -3377,13 +3385,15 @@ bool sys_var_thd_table_type::update(THD *thd, set_var *var)
Functions to handle sql_mode
****************************************************************************/
/*
Make string representation of mode
/**
Make string representation of mode.
SYNOPSIS
thd in thread handler
val in sql_mode value
rep out pointer pointer to string with sql_mode representation
@param[in] thd thread handler
@param[in] val sql_mode value
@param[out] len pointer on length of string
@return
pointer to string with sql_mode representation
*/
bool
@ -3454,7 +3464,7 @@ void fix_sql_mode_var(THD *thd, enum_var_type type)
}
}
/* Map database specific bits to function bits */
/** Map database specific bits to function bits. */
ulong fix_sql_mode(ulong sql_mode)
{

351
sql/sp.cc
View File

@ -249,19 +249,18 @@ Stored_routine_creation_ctx::load_from_db(THD *thd,
/*************************************************************************/
/*
/**
Open the mysql.proc table for read.
SYNOPSIS
open_proc_table_for_read()
thd Thread context
backup Pointer to Open_tables_state instance where information about
currently open tables will be saved, and from which will be
restored when we will end work with mysql.proc.
@param thd Thread context
@param backup Pointer to Open_tables_state instance where information about
currently open tables will be saved, and from which will be
restored when we will end work with mysql.proc.
RETURN
@retval
0 Error
# Pointer to TABLE object of mysql.proc
@retval
\# Pointer to TABLE object of mysql.proc
*/
TABLE *open_proc_table_for_read(THD *thd, Open_tables_state *backup)
@ -281,19 +280,18 @@ TABLE *open_proc_table_for_read(THD *thd, Open_tables_state *backup)
}
/*
/**
Open the mysql.proc table for update.
SYNOPSIS
open_proc_table_for_update()
thd Thread context
@param thd Thread context
NOTES
@note
Table opened with this call should closed using close_thread_tables().
RETURN
@retval
0 Error
# Pointer to TABLE object of mysql.proc
@retval
\# Pointer to TABLE object of mysql.proc
*/
static TABLE *open_proc_table_for_update(THD *thd)
@ -310,19 +308,18 @@ static TABLE *open_proc_table_for_update(THD *thd)
}
/*
/**
Find row in open mysql.proc table representing stored routine.
SYNOPSIS
db_find_routine_aux()
thd Thread context
type Type of routine to find (function or procedure)
name Name of routine
table TABLE object for open mysql.proc table.
@param thd Thread context
@param type Type of routine to find (function or procedure)
@param name Name of routine
@param table TABLE object for open mysql.proc table.
RETURN VALUE
SP_OK - Routine found
SP_KEY_NOT_FOUND- No routine with given name
@retval
SP_OK Routine found
@retval
SP_KEY_NOT_FOUND No routine with given name
*/
static int
@ -357,25 +354,24 @@ db_find_routine_aux(THD *thd, int type, sp_name *name, TABLE *table)
}
/*
/**
Find routine definition in mysql.proc table and create corresponding
sp_head object for it.
SYNOPSIS
db_find_routine()
thd Thread context
type Type of routine (TYPE_ENUM_PROCEDURE/...)
name Name of routine
sphp Out parameter in which pointer to created sp_head
object is returned (0 in case of error).
@param thd Thread context
@param type Type of routine (TYPE_ENUM_PROCEDURE/...)
@param name Name of routine
@param sphp Out parameter in which pointer to created sp_head
object is returned (0 in case of error).
NOTE
@note
This function may damage current LEX during execution, so it is good
idea to create temporary LEX and make it active before calling it.
RETURN VALUE
0 - Success
non-0 - Error (may be one of special codes like SP_KEY_NOT_FOUND)
@retval
0 Success
@retval
non-0 Error (may be one of special codes like SP_KEY_NOT_FOUND)
*/
static int
@ -1284,22 +1280,21 @@ sp_show_create_routine(THD *thd, int type, sp_name *name)
}
/*
/**
Obtain object representing stored procedure/function by its name from
stored procedures cache and looking into mysql.proc if needed.
SYNOPSIS
sp_find_routine()
thd - thread context
type - type of object (TYPE_ENUM_FUNCTION or TYPE_ENUM_PROCEDURE)
name - name of procedure
cp - hash to look routine in
cache_only - if true perform cache-only lookup
(Don't look in mysql.proc).
@param thd thread context
@param type type of object (TYPE_ENUM_FUNCTION or TYPE_ENUM_PROCEDURE)
@param name name of procedure
@param cp hash to look routine in
@param cache_only if true perform cache-only lookup
(Don't look in mysql.proc).
RETURN VALUE
Non-0 pointer to sp_head object for the procedure, or
0 - in case of error.
@retval
NonNULL pointer to sp_head object for the procedure
@retval
NULL in case of error.
*/
sp_head *
@ -1395,7 +1390,7 @@ sp_find_routine(THD *thd, int type, sp_name *name, sp_cache **cp,
}
/*
/**
This is used by sql_acl.cc:mysql_routine_grant() and is used to find
the routines in 'routines'.
*/
@ -1444,18 +1439,17 @@ sp_exist_routines(THD *thd, TABLE_LIST *routines, bool any, bool no_error)
}
/*
/**
Check if a routine exists in the mysql.proc table, without actually
parsing the definition. (Used for dropping)
parsing the definition. (Used for dropping).
SYNOPSIS
sp_routine_exists_in_table()
thd - thread context
name - name of procedure
@param thd thread context
@param name name of procedure
RETURN VALUE
0 - Success
non-0 - Error; SP_OPEN_TABLE_FAILED or SP_KEY_NOT_FOUND
@retval
0 Success
@retval
non-0 Error; SP_OPEN_TABLE_FAILED or SP_KEY_NOT_FOUND
*/
int
@ -1477,7 +1471,7 @@ sp_routine_exists_in_table(THD *thd, int type, sp_name *name)
}
/*
/**
Structure that represents element in the set of stored routines
used by statement or routine.
*/
@ -1485,14 +1479,16 @@ struct Sroutine_hash_entry;
struct Sroutine_hash_entry
{
/* Set key consisting of one-byte routine type and quoted routine name. */
/**
Set key consisting of one-byte routine type and quoted routine name.
*/
LEX_STRING key;
/*
/**
Next element in list linking all routines in set. See also comments
for LEX::sroutine/sroutine_list and sp_head::m_sroutines.
*/
Sroutine_hash_entry *next;
/*
/**
Uppermost view which directly or indirectly uses this routine.
0 if routine is not used in view. Note that it also can be 0 if
statement uses routine both via view and directly.
@ -1510,24 +1506,22 @@ extern "C" uchar* sp_sroutine_key(const uchar *ptr, size_t *plen,
}
/*
/**
Check if
- current statement (the one in thd->lex) needs table prelocking
- first routine in thd->lex->sroutines_list needs to execute its body in
prelocked mode.
SYNOPSIS
sp_get_prelocking_info()
thd Current thread, thd->lex is the statement to be
checked.
need_prelocking OUT TRUE - prelocked mode should be activated
before executing the statement
FALSE - Don't activate prelocking
first_no_prelocking OUT TRUE - Tables used by first routine in
thd->lex->sroutines_list should be
prelocked.
FALSE - Otherwise.
NOTES
@param thd Current thread, thd->lex is the statement to be
checked.
@param[out] need_prelocking TRUE - prelocked mode should be activated
before executing the statement;
FALSE - Don't activate prelocking
@param[out] first_no_prelocking TRUE - Tables used by first routine in
thd->lex->sroutines_list should be
prelocked. FALSE - Otherwise.
@note
This function assumes that for any "CALL proc(...)" statement routines_list
will have 'proc' as first element (it may have several, consider e.g.
"proc(sp_func(...)))". This property is currently guaranted by the parser.
@ -1547,36 +1541,37 @@ void sp_get_prelocking_info(THD *thd, bool *need_prelocking,
}
/*
/**
Auxilary function that adds new element to the set of stored routines
used by statement.
SYNOPSIS
add_used_routine()
lex LEX representing statement
arena Arena in which memory for new element will be allocated
key Key for the hash representing set
belong_to_view Uppermost view which uses this routine
(0 if routine is not used by view)
In case when statement uses stored routines but does not need
prelocking (i.e. it does not use any tables) we will access the
elements of LEX::sroutines set on prepared statement re-execution.
Because of this we have to allocate memory for both hash element
and copy of its key in persistent arena.
NOTES
@param lex LEX representing statement
@param arena Arena in which memory for new element will be
allocated
@param key Key for the hash representing set
@param belong_to_view Uppermost view which uses this routine
(0 if routine is not used by view)
@note
Will also add element to end of 'LEX::sroutines_list' list.
In case when statement uses stored routines but does not need
prelocking (i.e. it does not use any tables) we will access the
elements of LEX::sroutines set on prepared statement re-execution.
Because of this we have to allocate memory for both hash element
and copy of its key in persistent arena.
TODO
@todo
When we will got rid of these accesses on re-executions we will be
able to allocate memory for hash elements in non-persitent arena
and directly use key values from sp_head::m_sroutines sets instead
of making their copies.
RETURN VALUE
TRUE - new element was added.
FALSE - element was not added (because it is already present in the set).
@retval
TRUE new element was added.
@retval
FALSE element was not added (because it is already present in
the set).
*/
static bool add_used_routine(LEX *lex, Query_arena *arena,
@ -1606,24 +1601,22 @@ static bool add_used_routine(LEX *lex, Query_arena *arena,
}
/*
/**
Add routine which is explicitly used by statement to the set of stored
routines used by this statement.
SYNOPSIS
sp_add_used_routine()
lex - LEX representing statement
arena - arena in which memory for new element of the set
will be allocated
rt - routine name
rt_type - routine type (one of TYPE_ENUM_PROCEDURE/...)
To be friendly towards prepared statements one should pass
persistent arena as second argument.
NOTES
@param lex LEX representing statement
@param arena arena in which memory for new element of the set
will be allocated
@param rt routine name
@param rt_type routine type (one of TYPE_ENUM_PROCEDURE/...)
@note
Will also add element to end of 'LEX::sroutines_list' list (and will
take into account that this is explicitly used routine).
To be friendly towards prepared statements one should pass
persistent arena as second argument.
*/
void sp_add_used_routine(LEX *lex, Query_arena *arena,
@ -1636,13 +1629,11 @@ void sp_add_used_routine(LEX *lex, Query_arena *arena,
}
/*
/**
Remove routines which are only indirectly used by statement from
the set of routines used by this statement.
SYNOPSIS
sp_remove_not_own_routines()
lex LEX representing statement
@param lex LEX representing statement
*/
void sp_remove_not_own_routines(LEX *lex)
@ -1665,16 +1656,14 @@ void sp_remove_not_own_routines(LEX *lex)
}
/*
/**
Merge contents of two hashes representing sets of routines used
by statements or by other routines.
SYNOPSIS
sp_update_sp_used_routines()
dst - hash to which elements should be added
src - hash from which elements merged
@param dst hash to which elements should be added
@param src hash from which elements merged
NOTE
@note
This procedure won't create new Sroutine_hash_entry objects,
instead it will simply add elements from source to destination
hash. Thus time of life of elements in destination hash becomes
@ -1694,18 +1683,17 @@ void sp_update_sp_used_routines(HASH *dst, HASH *src)
}
/*
/**
Add contents of hash representing set of routines to the set of
routines used by statement.
SYNOPSIS
sp_update_stmt_used_routines()
thd Thread context
lex LEX representing statement
src Hash representing set from which routines will be added
belong_to_view Uppermost view which uses these routines, 0 if none
@param thd Thread context
@param lex LEX representing statement
@param src Hash representing set from which routines will
be added
@param belong_to_view Uppermost view which uses these routines, 0 if none
NOTE
@note
It will also add elements to end of 'LEX::sroutines_list' list.
*/
@ -1721,18 +1709,17 @@ sp_update_stmt_used_routines(THD *thd, LEX *lex, HASH *src,
}
/*
/**
Add contents of list representing set of routines to the set of
routines used by statement.
SYNOPSIS
sp_update_stmt_used_routines()
thd Thread context
lex LEX representing statement
src List representing set from which routines will be added
belong_to_view Uppermost view which uses these routines, 0 if none
@param thd Thread context
@param lex LEX representing statement
@param src List representing set from which routines will
be added
@param belong_to_view Uppermost view which uses these routines, 0 if none
NOTE
@note
It will also add elements to end of 'LEX::sroutines_list' list.
*/
@ -1745,27 +1732,28 @@ static void sp_update_stmt_used_routines(THD *thd, LEX *lex, SQL_LIST *src,
}
/*
/**
Cache sub-set of routines used by statement, add tables used by these
routines to statement table list. Do the same for all routines used
by these routines.
SYNOPSIS
sp_cache_routines_and_add_tables_aux()
thd - thread context
lex - LEX representing statement
start - first routine from the list of routines to be cached
(this list defines mentioned sub-set).
first_no_prelock - If true, don't add tables or cache routines used by
the body of the first routine (i.e. *start)
will be executed in non-prelocked mode.
NOTE
@param thd thread context
@param lex LEX representing statement
@param start first routine from the list of routines to be cached
(this list defines mentioned sub-set).
@param first_no_prelock If true, don't add tables or cache routines used by
the body of the first routine (i.e. *start)
will be executed in non-prelocked mode.
@param tabs_changed Set to TRUE some tables were added, FALSE otherwise
@note
If some function is missing this won't be reported here.
Instead this fact will be discovered during query execution.
RETURN VALUE
0 - success
non-0 - failure
@retval
0 success
@retval
non-0 failure
*/
static int
@ -1857,21 +1845,20 @@ sp_cache_routines_and_add_tables_aux(THD *thd, LEX *lex,
}
/*
/**
Cache all routines from the set of used by statement, add tables used
by those routines to statement table list. Do the same for all routines
used by those routines.
SYNOPSIS
sp_cache_routines_and_add_tables()
thd - thread context
lex - LEX representing statement
first_no_prelock - If true, don't add tables or cache routines used by
the body of the first routine (i.e. *start)
@param thd thread context
@param lex LEX representing statement
@param first_no_prelock If true, don't add tables or cache routines used by
the body of the first routine (i.e. *start)
RETURN VALUE
0 - success
non-0 - failure
@retval
0 success
@retval
non-0 failure
*/
int
@ -1883,20 +1870,21 @@ sp_cache_routines_and_add_tables(THD *thd, LEX *lex, bool first_no_prelock)
}
/*
Add all routines used by view to the set of routines used by statement.
/**
Add all routines used by view to the set of routines used by
statement.
Add tables used by those routines to statement table list. Do the same
for all routines used by these routines.
SYNOPSIS
sp_cache_routines_and_add_tables_for_view()
thd Thread context
lex LEX representing statement
view Table list element representing view
@param thd Thread context
@param lex LEX representing statement
@param view Table list element representing view
RETURN VALUE
0 - success
non-0 - failure
@retval
0 success
@retval
non-0 failure
*/
int
@ -1911,20 +1899,19 @@ sp_cache_routines_and_add_tables_for_view(THD *thd, LEX *lex, TABLE_LIST *view)
}
/*
/**
Add triggers for table to the set of routines used by statement.
Add tables used by them to statement table list. Do the same for
all implicitly used routines.
SYNOPSIS
sp_cache_routines_and_add_tables_for_triggers()
thd thread context
lex LEX respresenting statement
table Table list element for table with trigger
@param thd thread context
@param lex LEX respresenting statement
@param table Table list element for table with trigger
RETURN VALUE
0 - success
non-0 - failure
@retval
0 success
@retval
non-0 failure
*/
int
@ -1970,10 +1957,12 @@ sp_cache_routines_and_add_tables_for_triggers(THD *thd, LEX *lex,
}
/*
* Generates the CREATE... string from the table information.
* Returns TRUE on success, FALSE on (alloc) failure.
*/
/**
Generates the CREATE... string from the table information.
@return
Returns TRUE on success, FALSE on (alloc) failure.
*/
static bool
create_string(THD *thd, String *buf,
int type,

395
sql/sp_head.cc
View File

@ -80,19 +80,20 @@ sp_map_item_type(enum enum_field_types type)
}
/*
/**
Return a string representation of the Item value.
NOTE: If the item has a string result type, the string is escaped
according to its character set.
@param thd thread handle
@param str string buffer for representation of the value
SYNOPSIS
item a pointer to the Item
str string buffer for representation of the value
@note
If the item has a string result type, the string is escaped
according to its character set.
RETURN
NULL on error
a pointer to valid a valid string on success
@retval
NULL on error
@retval
non-NULL a pointer to valid a valid string on success
*/
static String *
@ -137,16 +138,12 @@ sp_get_item_value(THD *thd, Item *item, String *str)
}
/*
SYNOPSIS
sp_get_flags_for_command()
DESCRIPTION
Returns a combination of:
* sp_head::MULTI_RESULTS: added if the 'cmd' is a command that might
result in multiple result sets being sent back.
* sp_head::CONTAINS_DYNAMIC_SQL: added if 'cmd' is one of PREPARE,
EXECUTE, DEALLOCATE.
/**
Returns a combination of:
- sp_head::MULTI_RESULTS: added if the 'cmd' is a command that might
result in multiple result sets being sent back.
- sp_head::CONTAINS_DYNAMIC_SQL: added if 'cmd' is one of PREPARE,
EXECUTE, DEALLOCATE.
*/
uint
@ -286,17 +283,16 @@ sp_get_flags_for_command(LEX *lex)
return flags;
}
/*
/**
Prepare an Item for evaluation (call of fix_fields).
SYNOPSIS
sp_prepare_func_item()
thd thread handler
it_addr pointer on item refernce
@param thd thread handler
@param it_addr pointer on item refernce
RETURN
NULL error
prepared item
@retval
NULL error
@retval
non-NULL prepared item
*/
Item *
@ -316,17 +312,16 @@ sp_prepare_func_item(THD* thd, Item **it_addr)
}
/*
/**
Evaluate an expression and store the result in the field.
SYNOPSIS
sp_eval_expr()
thd - current thread object
expr_item - the root item of the expression
result_field - the field to store the result
@param thd current thread object
@param result_field the field to store the result
@param expr_item_ptr the root item of the expression
RETURN VALUES
@retval
FALSE on success
@retval
TRUE on error
*/
@ -386,6 +381,9 @@ sp_eval_expr(THD *thd, Field *result_field, Item **expr_item_ptr)
*
*/
/**
Init the qualified name from the db and name.
*/
void
sp_name::init_qname(THD *thd)
{
@ -400,16 +398,17 @@ sp_name::init_qname(THD *thd)
}
/*
Check that the name 'ident' is ok. It's assumed to be an 'ident'
/**
Check that the name 'ident' is ok. It's assumed to be an 'ident'
from the parser, so we only have to check length and trailing spaces.
The former is a standard requirement (and 'show status' assumes a
non-empty name), the latter is a mysql:ism as trailing spaces are
removed by get_field().
RETURN
TRUE - bad name
FALSE - name is ok
@retval
TRUE bad name
@retval
FALSE name is ok
*/
bool
@ -417,7 +416,7 @@ check_routine_name(LEX_STRING *ident)
{
if (!ident || !ident->str || !ident->str[0] ||
ident->str[ident->length-1] == ' ')
{
{
my_error(ER_SP_WRONG_NAME, MYF(0), ident->str);
return TRUE;
}
@ -742,7 +741,7 @@ sp_head::destroy()
}
/*
/**
This is only used for result fields from functions (both during
fix_length_and_dec() and evaluation).
*/
@ -861,29 +860,23 @@ int cmp_splocal_locations(Item_splocal * const *a, Item_splocal * const *b)
*/
/*
Replace thd->query{_length} with a string that one can write to the binlog
or the query cache.
SYNOPSIS
subst_spvars()
thd Current thread.
instr Instruction (we look for Item_splocal instances in
instr->free_list)
query_str Original query string
DESCRIPTION
/**
Replace thd->query{_length} with a string that one can write to
the binlog.
The binlog-suitable string is produced by replacing references to SP local
variables with NAME_CONST('sp_var_name', value) calls. To make this string
suitable for the query cache this function allocates some additional space
for the query cache flags.
RETURN
FALSE on success
thd->query{_length} either has been appropriately replaced or there
is no need for replacements.
TRUE out of memory error.
variables with NAME_CONST('sp_var_name', value) calls.
@param thd Current thread.
@param instr Instruction (we look for Item_splocal instances in
instr->free_list)
@param query_str Original query string
@return
- FALSE on success.
thd->query{_length} either has been appropriately replaced or there
is no need for replacements.
- TRUE out of memory error.
*/
static bool
@ -1002,14 +995,17 @@ void sp_head::recursion_level_error(THD *thd)
}
/*
Execute the routine. The main instruction jump loop is there
/**
Execute the routine. The main instruction jump loop is there.
Assume the parameters already set.
RETURN
FALSE on success
TRUE on error
@todo
- Will write this SP statement into binlog separately
(TODO: consider changing the condition to "not inside event union")
@retval
FALSE on success
@retval
TRUE on error
*/
bool
@ -1299,22 +1295,26 @@ sp_head::execute(THD *thd)
#ifndef NO_EMBEDDED_ACCESS_CHECKS
/*
/**
set_routine_security_ctx() changes routine security context, and
checks if there is an EXECUTE privilege in new context. If there is
no EXECUTE privilege, it changes the context back and returns a
error.
SYNOPSIS
set_routine_security_ctx()
thd thread handle
sp stored routine to change the context for
is_proc TRUE is procedure, FALSE if function
save_ctx pointer to an old security context
RETURN
TRUE if there was a error, and the context wasn't changed.
FALSE if the context was changed.
@param thd thread handle
@param sp stored routine to change the context for
@param is_proc TRUE is procedure, FALSE if function
@param save_ctx pointer to an old security context
@todo
- Cache if the definer has the right to use the object on the
first usage and only reset the cache if someone does a GRANT
statement that 'may' affect this.
@retval
TRUE if there was a error, and the context wasn't changed.
@retval
FALSE if the context was changed.
*/
bool
@ -1356,22 +1356,27 @@ set_routine_security_ctx(THD *thd, sp_head *sp, bool is_proc,
/**
Execute trigger stored program.
Execute a trigger:
- changes security context for triggers;
- switch to new memroot;
- call sp_head::execute;
- restore old memroot;
- restores security context.
- changes security context for triggers
- switch to new memroot
- call sp_head::execute
- restore old memroot
- restores security context
@param thd Thread context.
@param db_name Database name.
@param table_name Table name.
@param grant_info GRANT_INFO structure to be filled with information
about definer's privileges on subject table.
@param thd Thread handle
@param db database name
@param table table name
@param grant_info GRANT_INFO structure to be filled with
information about definer's privileges
on subject table
@return Error status.
@retval FALSE on success.
@retval TRUE on error.
@todo
- TODO: we should create sp_rcontext once per command and reuse it
on subsequent executions of a trigger.
@retval
FALSE on success
@retval
TRUE on error
*/
bool
@ -1479,8 +1484,9 @@ err_with_cleanup:
}
/*
Execute a function:
/**
Execute a function.
- evaluate parameters
- changes security context for SUID routines
- switch to new memroot
@ -1489,17 +1495,25 @@ err_with_cleanup:
- evaluate the return value
- restores security context
SYNOPSIS
sp_head::execute_function()
thd Thread handle
argp Passed arguments (these are items from containing
statement?)
argcount Number of passed arguments. We need to check if this is
correct.
return_value_fld Save result here.
RETURN
@param thd Thread handle
@param argp Passed arguments (these are items from containing
statement?)
@param argcount Number of passed arguments. We need to check if
this is correct.
@param return_value_fld Save result here.
@todo
We should create sp_rcontext once per command and reuse
it on subsequent executions of a function/trigger.
@todo
In future we should associate call arena/mem_root with
sp_rcontext and allocate all these objects (and sp_rcontext
itself) on it directly rather than juggle with arenas.
@retval
FALSE on success
@retval
TRUE on error
*/
@ -1716,14 +1730,8 @@ err_with_cleanup:
}
/*
/**
Execute a procedure.
SYNOPSIS
sp_head::execute_procedure()
thd Thread handle
args List of values passed as arguments.
DESCRIPTION
The function does the following steps:
- Set all parameters
@ -1732,8 +1740,12 @@ err_with_cleanup:
- copy back values of INOUT and OUT parameters
- restores security context
RETURN
@param thd Thread handle
@param args List of values passed as arguments.
@retval
FALSE on success
@retval
TRUE on error
*/
@ -1935,7 +1947,7 @@ sp_head::execute_procedure(THD *thd, List<Item> *args)
}
// Reset lex during parsing, before we parse a sub statement.
/// Reset lex during parsing, before we parse a sub statement.
void
sp_head::reset_lex(THD *thd)
{
@ -1968,7 +1980,7 @@ sp_head::reset_lex(THD *thd)
DBUG_VOID_RETURN;
}
// Restore lex during parsing, after we have parsed a sub statement.
/// Restore lex during parsing, after we have parsed a sub statement.
void
sp_head::restore_lex(THD *thd)
{
@ -2011,6 +2023,9 @@ sp_head::restore_lex(THD *thd)
DBUG_VOID_RETURN;
}
/**
Put the instruction on the backpatch list, associated with the label.
*/
void
sp_head::push_backpatch(sp_instr *i, sp_label_t *lab)
{
@ -2024,6 +2039,10 @@ sp_head::push_backpatch(sp_instr *i, sp_label_t *lab)
}
}
/**
Update all instruction with this label in the backpatch list to
the current position.
*/
void
sp_head::backpatch(sp_label_t *lab)
{
@ -2038,19 +2057,18 @@ sp_head::backpatch(sp_label_t *lab)
}
}
/*
/**
Prepare an instance of Create_field for field creation (fill all necessary
attributes).
SYNOPSIS
sp_head::fill_field_definition()
thd [IN] Thread handle
lex [IN] Yacc parsing context
field_type [IN] Field type
field_def [OUT] An instance of Create_field to be filled
@param[in] thd Thread handle
@param[in] lex Yacc parsing context
@param[in] field_type Field type
@param[out] field_def An instance of create_field to be filled
RETURN
@retval
FALSE on success
@retval
TRUE on error
*/
@ -2196,18 +2214,17 @@ sp_head::restore_thd_mem_root(THD *thd)
}
/*
Check if a user has access right to a routine
/**
Check if a user has access right to a routine.
SYNOPSIS
check_show_routine_access()
thd Thread handler
sp SP
full_access Set to 1 if the user has SELECT right to the
'mysql.proc' able or is the owner of the routine
RETURN
0 ok
1 error
@param thd Thread handler
@param sp SP
@param full_access Set to 1 if the user has SELECT right to the
'mysql.proc' able or is the owner of the routine
@retval
false ok
@retval
true error
*/
bool check_show_routine_access(THD *thd, sp_head *sp, bool *full_access)
@ -2334,12 +2351,10 @@ sp_head::show_create_routine(THD *thd, int type)
/*
Add instruction to SP
/**
Add instruction to SP.
SYNOPSIS
sp_head::add_instr()
instr Instruction
@param instr Instruction
*/
void sp_head::add_instr(sp_instr *instr)
@ -2357,20 +2372,20 @@ void sp_head::add_instr(sp_instr *instr)
}
/*
/**
Do some minimal optimization of the code:
1) Mark used instructions
1.1) While doing this, shortcut jumps to jump instructions
2) Compact the code, removing unused instructions
-# Mark used instructions
-# While doing this, shortcut jumps to jump instructions
-# Compact the code, removing unused instructions.
This is the main mark and move loop; it relies on the following methods
in sp_instr and its subclasses:
opt_mark() Mark instruction as reachable
opt_shortcut_jump() Shortcut jumps to the final destination;
used by opt_mark().
opt_move() Update moved instruction
set_destination() Set the new destination (jump instructions only)
- opt_mark() : Mark instruction as reachable
- opt_shortcut_jump(): Shortcut jumps to the final destination;
used by opt_mark().
- opt_move() : Update moved instruction
- set_destination() : Set the new destination (jump instructions only)
*/
void sp_head::optimize()
@ -2461,9 +2476,10 @@ sp_head::opt_mark()
#ifndef DBUG_OFF
/*
/**
Return the routine instructions as a result set.
Returns 0 if ok, !=0 on error.
@return
0 if ok, !=0 on error.
*/
int
sp_head::show_routine_code(THD *thd)
@ -2526,27 +2542,25 @@ sp_head::show_routine_code(THD *thd)
#endif // ifndef DBUG_OFF
/*
/**
Prepare LEX and thread for execution of instruction, if requested open
and lock LEX's tables, execute instruction's core function, perform
cleanup afterwards.
SYNOPSIS
reset_lex_and_exec_core()
thd - thread context
nextp - out - next instruction
open_tables - if TRUE then check read access to tables in LEX's table
list and open and lock them (used in instructions which
need to calculate some expression and don't execute
complete statement).
sp_instr - instruction for which we prepare context, and which core
function execute by calling its exec_core() method.
@param thd thread context
@param nextp out - next instruction
@param open_tables if TRUE then check read access to tables in LEX's table
list and open and lock them (used in instructions which
need to calculate some expression and don't execute
complete statement).
@param sp_instr instruction for which we prepare context, and which core
function execute by calling its exec_core() method.
NOTE
@note
We are not saving/restoring some parts of THD which may need this because
we do this once for whole routine execution in sp_head::execute().
RETURN VALUE
@return
0/non-0 - Success/Failure
*/
@ -3300,6 +3314,11 @@ sp_instr_cpop::print(String *str)
sp_instr_copen class functions
*/
/**
@todo
Assert that we either have an error or a cursor
*/
int
sp_instr_copen::execute(THD *thd, uint *nextp)
{
@ -3621,24 +3640,23 @@ uchar *sp_table_key(const uchar *ptr, size_t *plen, my_bool first)
}
/*
/**
Merge the list of tables used by some query into the multi-set of
tables used by routine.
SYNOPSIS
merge_table_list()
thd - thread context
table - table list
lex_for_tmp_check - LEX of the query for which we are merging
table list.
@param thd thread context
@param table table list
@param lex_for_tmp_check LEX of the query for which we are merging
table list.
NOTE
@note
This method will use LEX provided to check whenever we are creating
temporary table and mark it as such in target multi-set.
RETURN VALUE
TRUE - Success
FALSE - Error
@retval
TRUE Success
@retval
FALSE Error
*/
bool
@ -3726,27 +3744,26 @@ sp_head::merge_table_list(THD *thd, TABLE_LIST *table, LEX *lex_for_tmp_check)
}
/*
/**
Add tables used by routine to the table list.
SYNOPSIS
add_used_tables_to_table_list()
thd [in] Thread context
query_tables_last_ptr [in/out] Pointer to the next_global member of
last element of the list where tables
will be added (or to its root).
belong_to_view [in] Uppermost view which uses this routine,
0 if none.
DESCRIPTION
Converts multi-set of tables used by this routine to table list and adds
this list to the end of table list specified by 'query_tables_last_ptr'.
Elements of list will be allocated in PS memroot, so this list will be
persistent between PS executions.
RETURN VALUE
TRUE - if some elements were added, FALSE - otherwise.
@param[in] thd Thread context
@param[in,out] query_tables_last_ptr Pointer to the next_global member of
last element of the list where tables
will be added (or to its root).
@param[in] belong_to_view Uppermost view which uses this routine,
0 if none.
@retval
TRUE if some elements were added
@retval
FALSE otherwise.
*/
bool
@ -3816,7 +3833,7 @@ sp_head::add_used_tables_to_table_list(THD *thd,
}
/*
/**
Simple function for adding an explicetly named (systems) table to
the global table list, e.g. "mysql", "proc".
*/