无法使用C ++连接到Access数据库
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我的主题对我来说有些愚蠢和复杂。我正在尝试与Access 2007 db建立非常简单的连接，但是连接从未发生。我正在尝试查看SQLGetDiagRec（）会发生什么，但是执行SQLGetDiagRec（）时程序崩溃。我对C ++的了解不多，因此在过去的几天中，我一直陷于此。任何帮助将不胜感激。我正在使用Visual C ++ 2008。
编辑：将字符集从Unicode更改为多字节后，我能够执行SQLGetDiagRec。然后，我将我的两个指针从int和char更改为SQLSMALLINT和SQLCHAR，并且，bam成功了。非常感谢那些单挑的家伙。
#include \"stdafx.h\"
#include <windows.h>
#include <conio.h>
#include <iostream>
#include <sql.h>
#include <sqltypes.h>
#include <sqlext.h>
#include <stdio.h>
#include <stdlib.h>
int main(){
char szDSN[256] = \"DRIVER={Microsoft Access Driver (*.mdb, *.accdb)};DSN=\'Hospital_mdb\';DBQ=C:\\\\Hospital.mdb;\";
SQLHANDLE EnvHandlePtr;
SQLHANDLE ConHandle;
SQLHANDLE StmtHandle;
SQLRETURN rc;
SQLSMALLINT iConnStrLength2Ptr; // Changing from int iConnStrLength2Ptr;
SQLCHAR szConnStrOut[256]; //changing from char szConnStrOut[256];
SQLCHAR SQLState[6], Msg[SQL_MAX_MESSAGE_LENGTH];
SQLINTEGER NativeError;
SQLSMALLINT MsgLen;
if ( (rc = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &EnvHandlePtr)) == SQL_SUCCESS){
printf(\"Environment Set!\");
if( (rc = SQLSetEnvAttr(EnvHandlePtr, SQL_ATTR_ODBC_VERSION,
(SQLPOINTER) SQL_OV_ODBC3, SQL_IS_UINTEGER))==SQL_SUCCESS ){
printf(\"Driver Set!\");
if ( (rc = SQLAllocHandle(SQL_HANDLE_DBC, EnvHandlePtr, &ConHandle))==SQL_SUCCESS ){
printf(\"Allocation Done!\");//**so far, so good, but then the connection doesn\'t happen**
rc = SQLDriverConnect(ConHandle, NULL, (SQLWCHAR*)szDSN,
SQL_NTS, (SQLWCHAR*) szConnStrOut, 0, (SQLSMALLINT*) iConnStrLength2Ptr, SQL_DRIVER_NOPROMPT);
if ( rc == SQL_SUCCESS ){
//if ( (rc = SQLConnect(ConHandle, (SQLWCHAR*)szDSN, SQL_NTS, (SQLWCHAR*)\"\", SQL_NTS, (SQLWCHAR*)\"\", SQL_NTS))== SQL_SUCCESS ){
printf(\"Connection Done\");
}//end of Connection clause
else{
SQLGetDiagRec(SQL_HANDLE_DBC, ConHandle, 1, (SQLWCHAR*)SQLState, &NativeError, (SQLWCHAR*)Msg, sizeof(Msg), &MsgLen);
printf(\"Connection Failed\\n%s\", Msg);
}
SQLDisconnect(ConHandle);
}//end of Connection Allocation clause
SQLFreeHandle(SQL_HANDLE_DBC, ConHandle);
}//end of Driver clause
SQLFreeHandle(SQL_HANDLE_ENV, EnvHandlePtr);
}//end of Enviroment clause
_getch();
}//end of main
没有找到相关结果
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纫合峭