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QODBC: fix converted string values empty SQLServer 2012 

SQL Server 2012 Native Client (version 11.0.2100.60) or later introduced
a change in the behavior of the SQLGetData method when converted string values
are involved. In older version a (sometimes wrong) size was returned. Now always
SQL_NO_TOTAL is returned which signals to read as much data as available.
SQL_NO_TOTAL was handled like SQL_NULL_DATA in the code before which indicates a
NULL value so the returned string was empty.

See link for more info: http://msdn.microsoft.com/en-us/library/jj219209.aspx

Change-Id: Ia0d2296caf593890b301ee1848d1bf3eb8d7b6fe
Reviewed-by: Mark Brand <mabrand@mabrand.nl>
bb10
Maximilian Hrabowski 2014-10-11 13:44:28 +02:00 committed by Mark Brand
parent 190f64aab3
commit a44749855e
1 changed files with 11 additions and 1 deletions
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12
src/sql/drivers/odbc/qsql_odbc.cpp
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@ -373,10 +373,20 @@ static QString qGetStringData(SQLHANDLE hStmt, int column, int colSize, bool uni
colSize*sizeof(SQLTCHAR),
&lengthIndicator);
if (r == SQL_SUCCESS || r == SQL_SUCCESS_WITH_INFO) {
if (lengthIndicator == SQL_NULL_DATA || lengthIndicator == SQL_NO_TOTAL) {
if (lengthIndicator == SQL_NULL_DATA) {
fieldVal.clear();
break;
}
// starting with ODBC Native Client 2012, SQL_NO_TOTAL is returned
// instead of the length (which sometimes was wrong in older versions)
// see link for more info: http://msdn.microsoft.com/en-us/library/jj219209.aspx
// if length indicator equals SQL_NO_TOTAL, indicating that
// more data can be fetched, but size not known, collect data
// and fetch next block
if (lengthIndicator == SQL_NO_TOTAL) {
fieldVal += fromSQLTCHAR(buf, colSize);
continue;
}
// if SQL_SUCCESS_WITH_INFO is returned, indicating that
// more data can be fetched, the length indicator does NOT
// contain the number of bytes returned - it contains the