Question

你好，我正在研究C和ODBC 调用SQLExecDirect函数时出错。请帮我这是代码

#include <Windows.h>
#include <sql.h>
#include <sqlext.h>

int main( void )
{
    //DB connect example
    SQLRETURN   nResult     = 0;
    SQLHANDLE   handleEnv   = 0;
    nResult = SQLAllocHandle( SQL_HANDLE_ENV, SQL_NULL_HANDLE, ( SQLHANDLE* )&handleEnv );
    //nResult = SQLSetEnvAttr( handleEnv, SQL_ATTR_ODBC_VERSION, ( SQLPOINTER )SQL_OV_ODBC2, SQL_IS_INTEGER );
    nResult = SQLSetEnvAttr( handleEnv, SQL_ATTR_ODBC_VERSION, ( SQLPOINTER )SQL_OV_ODBC3, SQL_IS_INTEGER );
    nResult = SQLSetEnvAttr( handleEnv, SQL_ATTR_CONNECTION_POOLING, (SQLPOINTER)SQL_CP_ONE_PER_HENV, SQL_IS_INTEGER);

    SQLHANDLE   handleDBC   = 0;
    nResult = SQLAllocHandle( SQL_HANDLE_DBC, handleEnv, ( SQLHANDLE* )&handleDBC );

    SQLCHAR     strConnect[ 256 ]       = "DSN=MY TEST DB; UID=TESTsa; PWD=TESTpw";
    SQLCHAR     strConnectOut[ 1024 ]   = {0};
    SQLSMALLINT nNumOut                 = 0;
    nResult = SQLDriverConnect( handleDBC, NULL, ( SQLCHAR* )strConnect, SQL_NTS, ( SQLCHAR* )strConnectOut, sizeof(strConnectOut),
                                &nNumOut, SQL_DRIVER_NOPROMPT );

    SQLHSTMT    handleStatement = 0;
    //nResult = ::SQLAllocStmt( handleDBC, &handleStatement );
    nResult = SQLAllocHandle( SQL_HANDLE_STMT, handleDBC, ( SQLHANDLE* )&handleStatement );

    SQLHSTMT    hstmt       = handleStatement;
    int         sqlResultOutput = 0;

    SQLINTEGER  cbValue     = 0;
    nResult = SQLBindParameter( hstmt, 1, SQL_PARAM_OUTPUT, SQL_C_SLONG,    SQL_INTEGER,    0, 0, &sqlResultOutput,  0, &cbValue );

    //here is the problem
    nResult = SQLExecDirect( hstmt, (SQLTCHAR*) "{CALL my_TEST_SP(?)}", SQL_NTS );
    //nResult Value is -1 and SQL State is 24000

    return 0;
}

每个通话结果都很好。除了一个之外，返回SQL_SUCCESS SQLExecDirect函数返回-1，SQLState为24000

存储过程很简单，就像这样

CREATE PROCEDURE my_TEST_SP
 @retValue int = 0 output
AS
BEGIN
   SET NOCOUNT ON

   SET @retValue = 0

   SELECT myTestCol
   FROM tTestTable

   IF @@ERROR <> 0
   BEGIN
     SET @retValue = -1
   END
END

我的操作系统是windows7。使用visual studio 2010 sp1，sqlserver 2012

我错过了什么？请告诉我，祝你有个美好的一天：）

Answer 1

主要区别似乎是odbc驱动程序版本。我的版本是2014.120.2000.08。我不认为这是由于不同的视觉工作室版本 - 我认为它们都在引擎盖下使用相同的odbc32.lib。

以下代码适用于我：我更改了存储过程以返回非0的内容（以验证我是否可以实际读取返回的数据）：

 @retValue int = 0 output
AS
BEGIN
   SET NOCOUNT ON

   SET @retValue = 3499

   SELECT myTestCol
   FROM tTestTable

   IF @@ERROR <> 0
   BEGIN
     SET @retValue = -1
   END
END

我在Visual Studio 2013中使用了以下代码：

void printErrDbc(SQLHDBC hDbc)
{
    SQLSMALLINT recNr = 1;
    SQLRETURN ret = SQL_SUCCESS;
    while (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
    {
        SQLWCHAR errMsg[SQL_MAX_MESSAGE_LENGTH + 1];
        SQLWCHAR sqlState[5 + 1];
        errMsg[0] = 0;
        SQLINTEGER nativeError;
        SQLSMALLINT cb = 0;
        ret = SQLGetDiagRec(SQL_HANDLE_DBC, hDbc, recNr, sqlState, &nativeError, errMsg, SQL_MAX_MESSAGE_LENGTH + 1, &cb);
        if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
        {
            std::wcerr << L"ERROR; native: " << nativeError << L"; state: " << sqlState << L"; msg: " << errMsg << std::endl;
        }
        ++recNr;
    }
}

void printErrStmt(SQLHSTMT hStmt)
{
    SQLSMALLINT recNr = 1;
    SQLRETURN ret = SQL_SUCCESS;
    while (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
    {
        SQLWCHAR errMsg[SQL_MAX_MESSAGE_LENGTH + 1];
        SQLWCHAR sqlState[5 + 1];
        errMsg[0] = 0;
        SQLINTEGER nativeError;
        SQLSMALLINT cb = 0;
        ret = SQLGetDiagRec(SQL_HANDLE_STMT, hStmt, recNr, sqlState, &nativeError, errMsg, SQL_MAX_MESSAGE_LENGTH + 1, &cb);
        if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
        {
            std::wcerr << L"ERROR; native: " << nativeError << L"; state: " << sqlState << L"; msg: " << errMsg << std::endl;
        }
        ++recNr;
    }
}

int _tmain(int argc, _TCHAR* argv[])
{
    //DB connect example
    SQLRETURN   nResult = 0;
    SQLHANDLE   handleEnv = 0;
    nResult = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, (SQLHANDLE*)&handleEnv);
    //nResult = SQLSetEnvAttr( handleEnv, SQL_ATTR_ODBC_VERSION, ( SQLPOINTER )SQL_OV_ODBC2, SQL_IS_INTEGER );
    nResult = SQLSetEnvAttr(handleEnv, SQL_ATTR_ODBC_VERSION, (SQLPOINTER)SQL_OV_ODBC3, SQL_IS_INTEGER);
    nResult = SQLSetEnvAttr(handleEnv, SQL_ATTR_CONNECTION_POOLING, (SQLPOINTER)SQL_CP_ONE_PER_HENV, SQL_IS_INTEGER);

    SQLHANDLE   handleDBC = 0;
    nResult = SQLAllocHandle(SQL_HANDLE_DBC, handleEnv, (SQLHANDLE*)&handleDBC);

    SQLWCHAR     strConnect[256] = L"DSN=test;UID=sa;PWD=MySecretPassword";
    SQLWCHAR     strConnectOut[1024] = { 0 };
    SQLSMALLINT nNumOut = 0;
    nResult = SQLDriverConnect(handleDBC, NULL, (SQLWCHAR*)strConnect, SQL_NTS, (SQLWCHAR*)strConnectOut, sizeof(strConnectOut),
        &nNumOut, SQL_DRIVER_NOPROMPT);
    if (!SQL_SUCCEEDED(nResult))
    {
        printErrDbc(handleDBC);
    }

    SQLHSTMT    handleStatement = 0;
    //nResult = ::SQLAllocStmt( handleDBC, &handleStatement );
    nResult = SQLAllocHandle(SQL_HANDLE_STMT, handleDBC, (SQLHANDLE*)&handleStatement);

    SQLHSTMT    hstmt = handleStatement;
    int         sqlResultOutput = 0;

    SQLINTEGER  cbValue = 0;
    nResult = SQLBindParameter(hstmt, 1, SQL_PARAM_OUTPUT, SQL_C_SLONG, SQL_INTEGER, 0, 0, &sqlResultOutput, 0, &cbValue);

    //here is the problem
    nResult = SQLExecDirect(hstmt, (SQLWCHAR*)L"{CALL my_TEST_SP(?)}", SQL_NTS);
    if (!SQL_SUCCEEDED(nResult))
    {
        printErrStmt(hstmt);
    }
    nResult = SQLMoreResults(hstmt);
    if (!(SQL_SUCCEEDED(nResult) || nResult == SQL_NO_DATA))
    {
        printErrStmt(hstmt);
    }
    std::wcout << L"Value of sqlResultOutput is: " << sqlResultOutput << std::endl;

    return 0;
}

在ODBC数据源管理器中，我使用版本为 2014.120.2000.08 的test创建了名为ODBC Driver 11 for SQL Server的相应DSN。最后，DSN条目显示以下属性（在您可以点击Test Data Source...的对话框中）：

Microsoft ODBC Driver for SQL Server Version 12.00.2000

Data Source Name: test
Data Source Description: 
Server: .\SQLSERVERINSTANCE
Use Integrated Security: Yes
Database: Test
Language: (Default)
Data Encryption: No
Trust Server Certificate: No
Multiple Active Result Sets(MARS): No
Mirror Server: 
Translate Character Data: Yes
Log Long Running Queries: No
Log Driver Statistics: No
Use Regional Settings: No
Use ANSI Quoted Identifiers: Yes
Use ANSI Null, Paddings and Warnings: Yes

如果我运行此示例应用程序，我会得到预期的输出：

Value of sqlResultOutput is: 3499

所以我建议您尝试使用最新的SQL Server ODBC驱动程序。我想这是下载：http://www.microsoft.com/de-ch/download/details.aspx?id=36434

SQLExecDirect结果-1在C中表示24000

1 个答案: