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SQL/ODBC: add another check to detect unicode availability in driver

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Since ODBC does not have a direct way finding out if unicode is
supported by the underlying driver the ODBC plugin does some checks. As
a last resort a sql statement is executed which returns a string. But
even this may fail because the select statement has no FROM part which
is rejected by at least Oracle does not allow. Therefore add another
query which is correct for Oracle & DB2 as a workaround. The question
why the first three statements to check for unicode availability fail
is still open but can't be checked since I've no access to an oracle
database.

Pick-to: 6.5
Fixes: QTBUG-96616
Fixes: QTBUG-102958
Change-Id: I8ec0115bbfbfc40852bcfb8e94b4b4ad3e395b37
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
This commit is contained in:
Christian Ehrlicher 2023-03-06 20:44:48 +01:00
parent 3b2c09a13c
commit f19320748d
1 changed files with 12 additions and 1 deletions
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13
src/plugins/sqldrivers/odbc/qsql_odbc.cpp
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@ -2050,7 +2050,18 @@ void QODBCDriverPrivate::checkUnicode()
hDbc,
&hStmt);
r = SQLExecDirect(hStmt, toSQLTCHAR("select 'test'"_L1).data(), SQL_NTS);
// for databases which do not return something useful in SQLGetInfo and are picky about a
// 'SELECT' statement without 'FROM' but support VALUE(foo) statement like e.g. DB2 or Oracle
const auto statements = {
"select 'test'"_L1,
"values('test')"_L1,
"select 'test' from dual"_L1,
};
for (const auto &statement : statements) {
r = SQLExecDirect(hStmt, toSQLTCHAR(statement).data(), SQL_NTS);
if (r == SQL_SUCCESS)
break;
}
if (r == SQL_SUCCESS) {
r = SQLFetch(hStmt);
if (r == SQL_SUCCESS) {