The handle types required for ODBC programs are as follows:
| Item | Handle type |
|---|---|
| Environment | SQLHENV |
| Connection | SQLHDBC |
| Statement | SQLHSTMT |
| Descriptor | SQLHDESC |
To use an ODBC handle, you perform the following tasks:
Call the SQLAllocHandle function.
Use the handle in subsequent function calls.
Free the object using SQLFreeHandle.
SQLAllocHandle takes the following parameters:
an identifier for the type of item being allocated
the handle of the parent item
a pointer to the location of the handle to be allocated
For information, see SQLAllocHandle in the Microsoft ODBC API Reference at ![[external link]](gif/external.gif)
http://msdn.microsoft.com/en-us/library/ms712455.aspx.
SQLFreeHandle takes the following parameters:
an identifier for the type of item being freed
the handle of the item being freed
For information, see SQLFreeHandle in the Microsoft ODBC API Reference at http://msdn.microsoft.com/en-us/library/ms710123.aspx.
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