147 lines
3.9 KiB
C++
147 lines
3.9 KiB
C++
/*++
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Copyright (c) 1995-1996 Microsoft Corporation
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Module Name:
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dynodbc.c
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Abstract:
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This module provides functions for dynamically loading the ODBC
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functions.
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Author:
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Murali R. Krishnan (MuraliK) 3-Nov-1995
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Revision History:
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--*/
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#include "precomp.hxx"
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extern "C"
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{
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# include "dynodbc.h"
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}
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//
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// ODBC DLL Entry Points, fill by calling LoadODBC
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//
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pfnSQLAllocConnect pSQLAllocConnect ;
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pfnSQLAllocEnv pSQLAllocEnv ;
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pfnSQLAllocStmt pSQLAllocStmt ;
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pfnSQLBindCol pSQLBindCol ;
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pfnSQLCancel pSQLCancel ;
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pfnSQLColAttributes pSQLColAttributes ;
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pfnSQLConnect pSQLConnect ;
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pfnSQLDescribeCol pSQLDescribeCol ;
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pfnSQLDisconnect pSQLDisconnect ;
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pfnSQLError pSQLError ;
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pfnSQLExecDirect pSQLExecDirect ;
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pfnSQLExecute pSQLExecute ;
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pfnSQLFetch pSQLFetch ;
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pfnSQLFreeConnect pSQLFreeConnect ;
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pfnSQLFreeEnv pSQLFreeEnv ;
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pfnSQLFreeStmt pSQLFreeStmt ;
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pfnSQLGetCursorName pSQLGetCursorName ;
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pfnSQLNumResultCols pSQLNumResultCols ;
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pfnSQLPrepare pSQLPrepare ;
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pfnSQLRowCount pSQLRowCount ;
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pfnSQLSetCursorName pSQLSetCursorName ;
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pfnSQLTransact pSQLTransact ;
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pfnSQLSetConnectOption pSQLSetConnectOption;
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pfnSQLDrivers pSQLDrivers ;
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pfnSQLDataSources pSQLDataSources ;
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pfnSQLBindParameter pSQLBindParameter ;
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pfnSQLGetInfo pSQLGetInfo ;
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pfnSQLMoreResults pSQLMoreResults ;
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# define ODBC_MODULE_NAME "odbc32.dll"
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#define LOAD_ENTRY( hMod, Name ) \
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(p##Name = (pfn##Name) GetProcAddress( (hMod), #Name ))
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static BOOL s_fODBCLoaded = FALSE;
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HMODULE g_hODBC = NULL;
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BOOL
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DynLoadODBC(
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VOID
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)
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{
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HMODULE hMod;
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if ( s_fODBCLoaded ) {
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return TRUE;
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}
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if ( (hMod = (HMODULE) LoadLibrary( ODBC_MODULE_NAME ))) {
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if (LOAD_ENTRY( hMod, SQLAllocConnect ) &&
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LOAD_ENTRY( hMod, SQLAllocEnv ) &&
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LOAD_ENTRY( hMod, SQLAllocStmt ) &&
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LOAD_ENTRY( hMod, SQLBindCol ) &&
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LOAD_ENTRY( hMod, SQLCancel ) &&
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LOAD_ENTRY( hMod, SQLColAttributes ) &&
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LOAD_ENTRY( hMod, SQLConnect ) &&
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LOAD_ENTRY( hMod, SQLDescribeCol ) &&
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LOAD_ENTRY( hMod, SQLDisconnect ) &&
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LOAD_ENTRY( hMod, SQLError ) &&
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LOAD_ENTRY( hMod, SQLExecDirect ) &&
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LOAD_ENTRY( hMod, SQLExecute ) &&
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LOAD_ENTRY( hMod, SQLFetch ) &&
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LOAD_ENTRY( hMod, SQLFreeConnect ) &&
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LOAD_ENTRY( hMod, SQLFreeEnv ) &&
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LOAD_ENTRY( hMod, SQLFreeStmt ) &&
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LOAD_ENTRY( hMod, SQLNumResultCols ) &&
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LOAD_ENTRY( hMod, SQLPrepare ) &&
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LOAD_ENTRY( hMod, SQLRowCount ) &&
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LOAD_ENTRY( hMod, SQLTransact ) &&
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LOAD_ENTRY( hMod, SQLSetConnectOption ) &&
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LOAD_ENTRY( hMod, SQLDrivers ) &&
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LOAD_ENTRY( hMod, SQLDataSources ) &&
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LOAD_ENTRY( hMod, SQLGetInfo ) &&
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LOAD_ENTRY( hMod, SQLBindParameter ) &&
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LOAD_ENTRY( hMod, SQLMoreResults ) ) {
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s_fODBCLoaded = TRUE;
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g_hODBC = hMod;
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} else {
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FreeLibrary(hMod);
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}
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}
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return (s_fODBCLoaded);
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} // DynLoadODBC()
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VOID
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DynUnloadODBC(
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VOID
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)
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{
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if ( !s_fODBCLoaded ) {
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return;
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}
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FreeLibrary( g_hODBC );
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s_fODBCLoaded = FALSE;
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g_hODBC = NULL;
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return;
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} // DynUnloadODBC
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