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Article ID: 166083 - Last Review: March 18, 2004 - Revision: 2.0
INFO: How to Enable Connection Pooling in an OLE DB Application
This article was previously published under Q166083
This article describes how to enable ODBC connection pooling in an OLE DB
application.
An OLE DB application can enable ODBC connection pooling if the OLE DB
application is using the OLE DB provider for ODBC. The OLE DB application
that uses the ODBC provider is like an ODBC application because the ODBC
provider internally calls the ODBC API to perform data manipulation.
The ODBC provider does not expose any property to allow an OLE DB
application to enable connection pooling. In order to enable connection
pooling, the OLE DB application needs to use the ODBC API to enable
connection pooling before using the ODBC provider. Because connection
pooling is a process-level attribute, any subsequent connection made
through the ODBC provider will be using connection pooling.
The following code demonstrates how an OLE DB application can enable
connection pooling:
SQLAllocEnv(&henv);
//enable connection pooling
SQLSetEnvAttr(
NULL,
SQL_ATTR_CONNECTION_POOLING,
(SQLPOINTER)SQL_CP_ONE_PER_DRIVER,
SQL_IS_INTEGER);
SQLAllocConnect(henv,&hdbc);
// connect to the OLE DB ODBC provider
OleInitialize(NULL);
...
hr = CoCreateInstance( CLSID_MSDASQL, NULL, CLSCTX_INPROC_SERVER,
IID_IDBInitialize, (void **)&pIDBInit );
...
CoUninitialize();
//finish OLE DB stuff
SQLFreeConnect(hdbc);
SQLFreeEnv(henv);
//disable connection pooling
SQLSetEnvAttr(
NULL, // make process level cursor pooling
SQL_ATTR_CONNECTION_POOLING,
(SQLPOINTER)SQL_CP_OFF,
SQL_IS_INTEGER);
APPLIES TO
- Microsoft Open Database Connectivity 3.0
- Microsoft OLE DB 1.1
| kbhowto kbprogramming KB166083 |
Retired KB Content DisclaimerThis article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.
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