Question

我一直在尝试使用odbc将记录插入sql server数据库，但有一些问题。下面的程序是在visual studio上使用控制台c ++的代码。

#include "stdafx.h"
#include <iostream>
#include <Windows.h>
#include <sqltypes.h>
#include <sql.h>
#include <sqlext.h>

using namespace std;


int _tmain(int argc, _TCHAR* argv[])
{

    RETCODE rc;
    HENV henv;
    HDBC hdbc;
    HSTMT hstmt;
    SDWORD cdData;

    cout << "Attempting Connection " << endl;

    SQLAllocEnv(&henv);
    SQLAllocConnect(henv, &hdbc);
    rc = SQLConnect(hdbc, L"DatasourceTest", SQL_NTS, 0, SQL_NTS, 0, SQL_NTS);

    if ((rc != SQL_SUCCESS) && (rc != SQL_SUCCESS_WITH_INFO))
    {
        cout << "Cannot open database -- make sure ODBC is confugured properly." << endl;
        SQLFreeConnect(hdbc);
        SQLFreeEnv(henv);
        cout << "Press ENTER to continue." << endl;
        cin.get();
        return 1;
    }
    else
    {
        cout << "Connected -- ODBC is confugured properly." << endl;
    }

    //Create a SQL statement




    UCHAR  szSqlStr[] = "INSERT INTO PERSONS (FirstName, LastName) VALUES ('Jack', 'Benson')";
    cout << "Executing " << szSqlStr << endl;
    rc = SQLAllocStmt(hdbc, &hstmt);
    rc = SQLPrepare(hstmt, (SQLWCHAR*)szSqlStr, sizeof(szSqlStr));
    rc = SQLExecute(hstmt);

    cout << "rc" << rc << endl;
    cout << "SQL_SUCCESS" << SQL_SUCCESS << endl;
    cout << "SQL_SUCCESS_WITH_INFO" << SQL_SUCCESS_WITH_INFO << endl;



    if ((rc != SQL_SUCCESS) && (rc != SQL_SUCCESS_WITH_INFO))
    {
        //ERROR 
        SQLWCHAR sqlState[8];
        SQLWCHAR msgText[1024];
        SQLINTEGER NativeErrorPtr;
        SQLSMALLINT TextLengthPtr;
        SQLGetDiagRec(SQL_HANDLE_STMT, hstmt, 1, sqlState, &NativeErrorPtr, msgText, sizeof(msgText), &TextLengthPtr);

        SQLFreeStmt(hstmt, SQL_DROP);
        SQLDisconnect(hdbc);
        SQLFreeConnect(hdbc);
        SQLFreeEnv(henv);
        cout << "Error " << endl << msgText << endl;
        cout << "Press ENTER to continue." << endl;


    }


    cin.get();
    return 0;
}

我在这个帖子中附加了程序的输出。返回的RETCODE为-1，屏幕截图中显示此错误。我无法将任何记录插入数据库。与数据库的连接没问题。每次执行程序时错误代码都不同。

Answer 1

主要错误是您将ANSI字符串传递给SQLPrepare的unicode版本。

UCHAR  szSqlStr[] = "INSERT INTO PERSONS (FirstName, LastName) VALUES ('Jack', 'Benson')";
...
rc = SQLPrepare(hstmt, (SQLWCHAR*)szSqlStr, sizeof(szSqlStr));

将程序的字符集更改为ANSI或将请求字符串转换为unicode。另外，您应该考虑最后一个参数取符号长度而不是字节

无法将数据插入SQL Server数据库ODBC C ++

1 个答案: