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Using Default Result Sets

SQL Server 2000

Using Default Result Sets

The default ODBC cursor attributes are:

SQLSetStmtAttr(hstmt, SQL_ATTR_CURSOR_TYPE, SQL_CURSOR_FORWARD_ONLY);
SQLSetStmtAttr(hstmt, SQL_ATTR_CONCURRENCY, SQL_CONCUR_READ_ONLY);
SQLSetStmtAttr(hstmt, SQL_ATTR_ROW_ARRAY_SIZE, 1);

Whenever these attributes are set to their defaults, the Microsoft® SQL Server™ ODBC driver uses a SQL Server default result set. Default result sets can be used for any SQL statement supported by SQL Server, and are the most efficient method of transferring an entire result set to the client.

Default result sets do not support multiple active statements on the same connection. After an SQL statement is executed on a connection, the server does not accept commands (except a request to cancel the rest of the result set) from the client on that connection until all the rows in the result set have been processed. To cancel the remainder of a partially processed result set, call SQLCloseCursor or SQLFreeStmt with the fOption parameter set to SQL_CLOSE. To finish a partially processed result set and test for the presence of another result set, call SQLMoreResults. If an ODBC application attempts a command on a connection handle before a default result set has been completely processed, the call generates SQL_ERROR and a call to SQLGetDiagRec returns:

szSqlState: "HY000", pfNativeError: 0
szErrorMsg: "[Microsoft][SQL Server ODBC Driver]
            Connection is busy with results for another hstmt."

To use cursors

ODBC

See Also

SQLCloseCursor

SQLFreeStmt

SQLMoreResults

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