MDAC 2.5 SDK - ODBC Programmer's Reference
Appendix G: Driver Guidelines for Backward Compatibility
When an application calls SQLSetScrollOptions through an ODBC 3.x driver and the driver does not support SQLSetScrollOptions, the call to
SQLSetScrollOptions(StatementHandle, Concurrency, KeysetSize, RowsetSize)
will result as follows:
SQLGetInfo(ConnectionHandle, InfoType, InfoValuePtr, BufferLength, StringLengthPtr)
with the InfoType argument set to one of the values in the following table, depending on the value of the KeysetSize argument in SQLSetScrollOptions.
| KeysetSize argument | InfoType argument |
| SQL_SCROLL_FORWARD_ONLY | SQL_FORWARD_ONLY_CURSOR_ATTRIBUTES2 |
| SQL_SCROLL_STATIC | SQL_STATIC_CURSOR_ATTRIBUTES2 |
| SQL_SCROLL_KEYSET_DRIVEN | SQL_KEYSET_CURSOR_ATTRIBUTES2 |
| SQL_SCROLL_DYNAMIC | SQL_DYNAMIC_CURSOR_ATTRIBUTES2 |
| A value greater than the RowsetSize argument | SQL_KEYSET_CURSOR_ATTRIBUTES2 |
If the value of the KeysetSize argument is not listed in the preceding table, the call to SQLSetScrollOptions returns SQLSTATE S1107 (Row value out of range) and none of the following steps are performed.
The Driver Manager then verifies whether the appropriate bit is set in the *InfoValuePtr value returned by the call to SQLGetInfo, according to the value of the Concurrency argument in SQLSetScrollOptions.
| Concurrency argument | InfoType setting |
| SQL_CONCUR_READ_ONLY | SQL_CA2_READ_ONLY_CONCURRENCY |
| SQL_CONCUR_LOCK | SQL_CA2_LOCK_CONCURRENCY |
| SQL_CONCUR_ROWVER | SQL_CA2_ROWVER_CONCURRENCY |
| SQL_CONCUR_VALUES | SQL_CA2_VALUES_CONCURRENCY |
If the Concurrency argument is not one of the values in the preceding table, the call to SQLSetScrollOptions returns SQLSTATE S1108 (Concurrency option out of range) and none of the following steps are performed. If the appropriate bit (as indicated in the preceding table) is not set in *InfoValuePtr to one of the values corresponding to the Concurrency argument, the call to SQLSetScrollOptions returns SQLSTATE S1C00 (Driver not capable) and none of the following steps are performed.
SQLSetStmtAttr(StatementHandle, SQL_ATTR_CURSOR_TYPE, ValuePtr, 0)
with *ValuePtr set to one of the values in the following table, according to the value of the KeysetSize argument in SQLSetScrollOptions.
| KeysetSize argument | *ValuePtr |
| SQL_SCROLL_FORWARD_ONLY | SQL_CURSOR_FORWARD_ONLY |
| SQL_SCROLL_STATIC | SQL_CURSOR_STATIC |
| SQL_SCROLL_KEYSET_DRIVEN | SQL_CURSOR_KEYSET_DRIVEN |
| SQL_SCROLL_DYNAMIC | SQL_CURSOR_DYNAMIC |
| A value greater than the RowsetSize argument | SQL_CURSOR_KEYSET_DRIVEN |
SQLSetStmtAttr(StatementHandle, SQL_ATTR_CONCURRENCY, ValuePtr, 0)
with *ValuePtr set to the Concurrency argument in SQLSetScrollOptions.
SQLSetStmtAttr(StatementHandle, SQL_ATTR_KEYSET_SIZE, ValuePtr, 0)
with *ValuePtr set to the KeysetSize argument in SQLSetScrollOptions.
SQLSetStmtAttr(StatementHandle, SQL_ROWSET_SIZE, ValuePtr, 0)
with *ValuePtr set to the RowsetSize argument in SQLSetScrollOptions.
Note When the Driver Manager maps SQLSetScrollOptions for an application working with an ODBC 3.x driver that does not support SQLSetScrollOptions, the Driver Manager sets the SQL_ROWSET_SIZE statement option, not the SQL_ATTR_ROW_ARRAY_SIZE statement attribute, to the RowsetSize argument in SQLSetScrollOption. As a result, SQLSetScrollOptions cannot be used by an application when fetching multiple rows by a call to SQLFetch or SQLFetchScroll. It can be used only when fetching multiple rows by a call to SQLExtendedFetch.