db2api_linux.cpp

通用的数据库中间库

// db2API_linux.cpp
//
//////////////////////////////////////////////////////////////////////

#include <SQLAPI.h>
#include <db2API.h>

#include <assert.h>

#include "samisc.h"
#include "errmsg.h"

#include <dlfcn.h>

static const char *g_sDB2DLLName = "libdb2.so";
static void* g_hDB2DLL = NULL;
long g_nDB2DLLVersionLoaded = 0;
static long g_nDB2DLLRefs = 0;

// API definitions
db2API g_db2API;

db2API::db2API()
{
	SQLAllocConnect		= NULL;
	SQLAllocEnv			= NULL;
	SQLAllocHandle		= NULL;
	SQLAllocStmt		= NULL;
	SQLBindCol			= NULL;
	SQLBindFileToCol	= NULL;
	SQLBindFileToParam	= NULL;
	SQLBindParameter	= NULL;
	SQLBrowseConnect	= NULL;
	SQLBuildDataLink	= NULL;
	SQLBulkOperations	= NULL;
	SQLCancel			= NULL;
	SQLCloseCursor		= NULL;
	SQLColAttribute		= NULL;
	SQLColAttributes	= NULL;
	SQLColumnPrivileges	= NULL;
	SQLColumns			= NULL;
	SQLConnect			= NULL;
	SQLCopyDesc			= NULL;
	SQLDataSources		= NULL;
	SQLDescribeCol		= NULL;
	SQLDescribeParam	= NULL;
	SQLDisconnect		= NULL;
	SQLDriverConnect	= NULL;
	SQLEndTran			= NULL;
	SQLError			= NULL;
	SQLExecDirect		= NULL;
	SQLExecute			= NULL;
	SQLExtendedBind		= NULL;
	SQLExtendedFetch	= NULL;
	SQLExtendedPrepare	= NULL;
	SQLFetch			= NULL;
	SQLFetchScroll		= NULL;
	SQLForeignKeys		= NULL;
	SQLFreeConnect		= NULL;
	SQLFreeEnv			= NULL;
	SQLFreeHandle		= NULL;
	SQLFreeStmt			= NULL;
	SQLGetConnectAttr	= NULL;
	SQLGetConnectOption	= NULL;
	SQLGetCursorName	= NULL;
	SQLGetData			= NULL;
	SQLGetDataLinkAttr	= NULL;
	SQLGetDescField		= NULL;
	SQLGetDescRec		= NULL;
	SQLGetDiagField		= NULL;
	SQLGetDiagRec		= NULL;
	SQLGetEnvAttr		= NULL;
	SQLGetFunctions		= NULL;
	SQLGetInfo			= NULL;
	SQLGetLength		= NULL;
	SQLGetPosition		= NULL;
	SQLGetSQLCA			= NULL;
	SQLGetStmtAttr		= NULL;
	SQLGetStmtOption	= NULL;
	SQLGetSubString		= NULL;
	SQLGetTypeInfo		= NULL;
	SQLMoreResults		= NULL;
	SQLNativeSql		= NULL;
	SQLNumParams		= NULL;
	SQLNumResultCols	= NULL;
	SQLParamData		= NULL;
	SQLParamOptions		= NULL;
	SQLPrepare			= NULL;
	SQLPrimaryKeys		= NULL;
	SQLProcedureColumns	= NULL;
	SQLProcedures		= NULL;
	SQLPutData			= NULL;
	SQLRowCount			= NULL;
	SQLSetColAttributes	= NULL;
	SQLSetConnectAttr	= NULL;
	SQLSetConnection	= NULL;
	SQLSetConnectOption	= NULL;
	SQLSetCursorName	= NULL;
	SQLSetDescField		= NULL;
	SQLSetDescRec		= NULL;
	SQLSetEnvAttr		= NULL;
	SQLSetParam			= NULL;
	SQLSetPos			= NULL;
	SQLSetStmtAttr		= NULL;
	SQLSetStmtOption	= NULL;
	SQLSpecialColumns	= NULL;
	SQLStatistics		= NULL;
	SQLTablePrivileges	= NULL;
	SQLTables			= NULL;
	SQLTransact			= NULL;
}

db2ConnectionHandles::db2ConnectionHandles()
{
	m_hevn = (SQLHENV)NULL;
	m_hdbc = (SQLHDBC)NULL;
}

db2CommandHandles::db2CommandHandles()
{
	m_hstmt = (SQLHSTMT)NULL;
}

static void LoadAPI()
{
	g_db2API.SQLAllocConnect	= (SQLAllocConnect_t)::dlsym(g_hDB2DLL, "SQLAllocConnect");	assert(g_db2API.SQLAllocConnect != NULL);
	g_db2API.SQLAllocEnv		= (SQLAllocEnv_t)::dlsym(g_hDB2DLL, "SQLAllocEnv");	assert(g_db2API.SQLAllocEnv != NULL);
	g_db2API.SQLAllocHandle		= (SQLAllocHandle_t)::dlsym(g_hDB2DLL, "SQLAllocHandle");	assert(g_db2API.SQLAllocHandle != NULL);
	g_db2API.SQLAllocStmt		= (SQLAllocStmt_t)::dlsym(g_hDB2DLL, "SQLAllocStmt");	assert(g_db2API.SQLAllocStmt != NULL);
	g_db2API.SQLBindCol			= (SQLBindCol_t)::dlsym(g_hDB2DLL, "SQLBindCol");	assert(g_db2API.SQLBindCol != NULL);
	g_db2API.SQLBindFileToCol	= (SQLBindFileToCol_t)::dlsym(g_hDB2DLL, "SQLBindFileToCol");	assert(g_db2API.SQLBindFileToCol != NULL);
	g_db2API.SQLBindFileToParam	= (SQLBindFileToParam_t)::dlsym(g_hDB2DLL, "SQLBindFileToParam");	assert(g_db2API.SQLBindFileToParam != NULL);
	g_db2API.SQLBindParameter	= (SQLBindParameter_t)::dlsym(g_hDB2DLL, "SQLBindParameter");	assert(g_db2API.SQLBindParameter != NULL);
	g_db2API.SQLBrowseConnect	= (SQLBrowseConnect_t)::dlsym(g_hDB2DLL, "SQLBrowseConnect");	assert(g_db2API.SQLBrowseConnect != NULL);
	g_db2API.SQLBuildDataLink	= (SQLBuildDataLink_t)::dlsym(g_hDB2DLL, "SQLBuildDataLink");	assert(g_db2API.SQLBuildDataLink != NULL);
	g_db2API.SQLBulkOperations	= (SQLBulkOperations_t)::dlsym(g_hDB2DLL, "SQLBulkOperations");	assert(g_db2API.SQLBulkOperations != NULL);
	g_db2API.SQLCancel			= (SQLCancel_t)::dlsym(g_hDB2DLL, "SQLCancel");	assert(g_db2API.SQLCancel != NULL);
	g_db2API.SQLCloseCursor		= (SQLCloseCursor_t)::dlsym(g_hDB2DLL, "SQLCloseCursor");	assert(g_db2API.SQLCloseCursor != NULL);
	g_db2API.SQLColAttribute	= (SQLColAttribute_t)::dlsym(g_hDB2DLL, "SQLColAttribute");	assert(g_db2API.SQLColAttribute != NULL);
	g_db2API.SQLColAttributes	= (SQLColAttributes_t)::dlsym(g_hDB2DLL, "SQLColAttributes");	assert(g_db2API.SQLColAttributes != NULL);
	g_db2API.SQLColumnPrivileges= (SQLColumnPrivileges_t)::dlsym(g_hDB2DLL, "SQLColumnPrivileges");	assert(g_db2API.SQLColumnPrivileges != NULL);
	g_db2API.SQLColumns			= (SQLColumns_t)::dlsym(g_hDB2DLL, "SQLColumns");	assert(g_db2API.SQLColumns != NULL);
	g_db2API.SQLConnect			= (SQLConnect_t)::dlsym(g_hDB2DLL, "SQLConnect");	assert(g_db2API.SQLConnect != NULL);
	g_db2API.SQLCopyDesc		= (SQLCopyDesc_t)::dlsym(g_hDB2DLL, "SQLCopyDesc");	assert(g_db2API.SQLCopyDesc != NULL);
	g_db2API.SQLDataSources		= (SQLDataSources_t)::dlsym(g_hDB2DLL, "SQLDataSources");	assert(g_db2API.SQLDataSources != NULL);
	g_db2API.SQLDescribeCol		= (SQLDescribeCol_t)::dlsym(g_hDB2DLL, "SQLDescribeCol");	assert(g_db2API.SQLDescribeCol != NULL);
	g_db2API.SQLDescribeParam	= (SQLDescribeParam_t)::dlsym(g_hDB2DLL, "SQLDescribeParam");	assert(g_db2API.SQLDescribeParam != NULL);
	g_db2API.SQLDisconnect		= (SQLDisconnect_t)::dlsym(g_hDB2DLL, "SQLDisconnect");	assert(g_db2API.SQLDisconnect != NULL);
	g_db2API.SQLDriverConnect	= (SQLDriverConnect_t)::dlsym(g_hDB2DLL, "SQLDriverConnect");	assert(g_db2API.SQLDriverConnect != NULL);
	g_db2API.SQLEndTran			= (SQLEndTran_t)::dlsym(g_hDB2DLL, "SQLEndTran");	assert(g_db2API.SQLEndTran != NULL);
	g_db2API.SQLError			= (SQLError_t)::dlsym(g_hDB2DLL, "SQLError");	assert(g_db2API.SQLError != NULL);
	g_db2API.SQLExecDirect		= (SQLExecDirect_t)::dlsym(g_hDB2DLL, "SQLExecDirect");	assert(g_db2API.SQLExecDirect != NULL);
	g_db2API.SQLExecute			= (SQLExecute_t)::dlsym(g_hDB2DLL, "SQLExecute");	assert(g_db2API.SQLExecute != NULL);
	g_db2API.SQLExtendedBind	= (SQLExtendedBind_t)::dlsym(g_hDB2DLL, "SQLExtendedBind");	assert(g_db2API.SQLExtendedBind != NULL);
	g_db2API.SQLExtendedFetch	= (SQLExtendedFetch_t)::dlsym(g_hDB2DLL, "SQLExtendedFetch");	assert(g_db2API.SQLExtendedFetch != NULL);
	g_db2API.SQLExtendedPrepare	= (SQLExtendedPrepare_t)::dlsym(g_hDB2DLL, "SQLExtendedPrepare");	assert(g_db2API.SQLExtendedPrepare != NULL);
	g_db2API.SQLFetch			= (SQLFetch_t)::dlsym(g_hDB2DLL, "SQLFetch");	assert(g_db2API.SQLFetch != NULL);
	g_db2API.SQLFetchScroll		= (SQLFetchScroll_t)::dlsym(g_hDB2DLL, "SQLFetchScroll");	assert(g_db2API.SQLFetchScroll != NULL);
	g_db2API.SQLForeignKeys		= (SQLForeignKeys_t)::dlsym(g_hDB2DLL, "SQLForeignKeys");	assert(g_db2API.SQLForeignKeys != NULL);
	g_db2API.SQLFreeConnect		= (SQLFreeConnect_t)::dlsym(g_hDB2DLL, "SQLFreeConnect");	assert(g_db2API.SQLFreeConnect != NULL);
	g_db2API.SQLFreeEnv			= (SQLFreeEnv_t)::dlsym(g_hDB2DLL, "SQLFreeEnv");	assert(g_db2API.SQLFreeEnv != NULL);
	g_db2API.SQLFreeHandle		= (SQLFreeHandle_t)::dlsym(g_hDB2DLL, "SQLFreeHandle");	assert(g_db2API.SQLFreeHandle != NULL);
	g_db2API.SQLFreeStmt		= (SQLFreeStmt_t)::dlsym(g_hDB2DLL, "SQLFreeStmt");	assert(g_db2API.SQLFreeStmt != NULL);
	g_db2API.SQLGetConnectAttr	= (SQLGetConnectAttr_t)::dlsym(g_hDB2DLL, "SQLGetConnectAttr");	assert(g_db2API.SQLGetConnectAttr != NULL);
	g_db2API.SQLGetConnectOption= (SQLGetConnectOption_t)::dlsym(g_hDB2DLL, "SQLGetConnectOption");	assert(g_db2API.SQLGetConnectOption != NULL);
	g_db2API.SQLGetCursorName	= (SQLGetCursorName_t)::dlsym(g_hDB2DLL, "SQLGetCursorName");	assert(g_db2API.SQLGetCursorName != NULL);
	g_db2API.SQLGetData			= (SQLGetData_t)::dlsym(g_hDB2DLL, "SQLGetData");	assert(g_db2API.SQLGetData != NULL);
	g_db2API.SQLGetDataLinkAttr	= (SQLGetDataLinkAttr_t)::dlsym(g_hDB2DLL, "SQLGetDataLinkAttr");	assert(g_db2API.SQLGetDataLinkAttr != NULL);