MDAC 2.5 SDK - ODBC Programmer's Reference
Appendix F: ODBC Cursor Library

Processing SQL Statements

The ODBC cursor library passes all SQL statements directly to the driver except the following:

• Positioned update and delete statements
  
  
• SELECT FOR UPDATE statements
  
  
• Batched SQL statements

To execute positioned update and delete statements and to position the cursor on a row to call SQLGetData for that row, the cursor library constructs a searched statement that identifies the row.