Implicit Cursor Conversions (ODBC)
Applications can request a cursor type through SQLSetStmtAttr and then execute an SQL statement that is not supported by server cursors of the type requested. A call to SQLExecute or SQLExecDirect returns SQL_SUCCESS_WITH_INFO and SQLGetDiagRec returns:
szSqlState = "01S02", *pfNativeError = 0,
szErrorMsg="[Microsoft][SQL Native Client]Cursor type changed"
The application can determine what type of cursor is now being used by calling SQLGetStmtOption set to SQL_CURSOR_TYPE. The cursor type conversion applies to only one statement. The next SQLExecDirect or SQLExecute will be done using the original statement cursor settings.
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概念
Cursor Programming Details (ODBC)