Post-review fix for BUG#15011.
Added comments.
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@ -164,6 +164,33 @@ sp_rcontext::set_return_value(THD *thd, Item *return_value_item)
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#define IS_NOT_FOUND_CONDITION(S) ((S)[0] == '0' && (S)[1] == '2')
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#define IS_EXCEPTION_CONDITION(S) ((S)[0] != '0' || (S)[1] > '2')
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/*
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Find a handler for the given errno.
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This is called from all error message functions (e.g. push_warning,
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net_send_error, et al) when a sp_rcontext is in effect. If a handler
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is found, no error is sent, and the the SP execution loop will instead
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invoke the found handler.
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This might be called several times before we get back to the execution
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loop, so m_hfound can be >= 0 if a handler has already been found.
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(In which case we don't search again - the first found handler will
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be used.)
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Handlers are pushed on the stack m_handler, with the latest/innermost
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one on the top; we then search for matching handlers from the top and
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down.
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We search through all the handlers, looking for the most specific one
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(sql_errno more specific than sqlstate more specific than the rest).
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Note that mysql error code handlers is a MySQL extension, not part of
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the standard.
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SYNOPSIS
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sql_errno The error code
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level Warning level
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RETURN
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1 if a handler was found, m_hfound is set to its index (>= 0)
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0 if not found, m_hfound is -1
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*/
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bool
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sp_rcontext::find_handler(uint sql_errno,
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MYSQL_ERROR::enum_warning_level level)
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@ -174,11 +201,13 @@ sp_rcontext::find_handler(uint sql_errno,
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const char *sqlstate= mysql_errno_to_sqlstate(sql_errno);
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int i= m_hcount, found= -1;
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/* Search handlers from the latest (innermost) to the oldest (outermost) */
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while (i--)
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{
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sp_cond_type_t *cond= m_handler[i].cond;
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int j= m_ihsp;
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/* Check active handlers, to avoid invoking one recursively */
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while (j--)
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if (m_in_handler[j] == m_handler[i].handler)
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break;
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