C++ msodbcsql17 SQLConnect 挂起

Question

我们有一个 C++ 应用程序，它使用 ODBC 连接到 SQL 服务器数据库。在CentOS 7应用服务器上是运行。它与 msodbcsql17 版本 17.4.2.1-1 完美配合，但与版本 17.6.1.1-1 一起中断。你能告诉我为什么吗？相关代码如下：

#include "DBODBC.h"
#include "ODBCResultSet.h"
#include <sqlext.h>
#include <sqlncli.h>

/* ----------------------------------------------------------------------------- */
/** Creates environment handle and sets ODBC version
*   /returns True if intialization succeeds, false otherwise
*/
/* ----------------------------------------------------------------------------- */
bool DBODBC::Init()
{
    DB::Init();
    if (!Check(SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &m_Env), m_Env,SQL_HANDLE_ENV ))
    {
        LOG_E("DBODBC::Init - Failed to create environment handle");
        return false;
    };

    if (!Check(SQLSetEnvAttr(m_Env,SQL_ATTR_ODBC_VERSION,(SQLPOINTER)SQL_OV_ODBC3,0), m_Env,SQL_HANDLE_ENV))
    {
        LOG_E("DBODBC::Init - Failed to set ODBC version");
        return false;
    };

    return true;
}

/* ----------------------------------------------------------------------------- */
/** Creates a connection to the database based on the parameters passed
*   /param user Null terminated string containing username to be used to connect to the DB
*   /param password Null terminated string containing password to be used to connect to the DB
*   /param DBName Null terminated string containing ODBC datasource name of the DB to connect to
*   /returns True if succeeded to connect to the DB, false otherwise
*/
/* ----------------------------------------------------------------------------- */
bool DBODBC::Connect(const char * user, const char * password, const char * DBName)
{
    LOG_I(2, "DBODBC::Connect - Started");
    
    if (IsConnected()) 
    {
        LOG_I(5, "DBODBC::Connect - DB connection is already up");
        return false;
    }
    //allocate connection handle
    if (SQLAllocHandle(SQL_HANDLE_DBC, m_Env, &m_Conn)==SQL_ERROR) 
    {
        LOG_W("DBODBC::Connect - Failed to allocate connection handle");
        return false;
    }

    SQLSetConnectAttr(m_Conn, SQL_COPT_SS_MARS_ENABLED, (SQLPOINTER)SQL_MARS_ENABLED_YES, SQL_IS_UINTEGER);

    LOG_I(2, "DBODBC::Connect - Calling SQLConnect");

    if (!Check(SQLConnect(m_Conn, (SQLCHAR*)DBName, SQL_NTS,(SQLCHAR*)user,SQL_NTS, (SQLCHAR*)password, SQL_NTS), m_Conn, SQL_HANDLE_DBC))
    {
        LOG_W("DBODBC::Connect - Failed to open connection to datasource \"%s\"", DBName);
        return false;
    }

    LOG_I(5, "DBODBC::Connect - Successfully connected to %s", DBName);
    m_bConnectionOk=true;
    m_bIsConnected=true;
    return true;
}

/* ----------------------------------------------------------------------------- */
/** Checks value returned by ODBC and collects diagnostic info if failed
*/
/* ----------------------------------------------------------------------------- */
bool DBODBC::Check(SQLRETURN RetCode, SQLHANDLE hHandle, SQLSMALLINT  hType)
{
    LOG_I(2, "DBODBC::Check - Started");
    SQLSMALLINT iRec = 0;
    SQLINTEGER  iError;
    SQLCHAR     wszMessage[1000];
    SQLCHAR     wszState[SQL_SQLSTATE_SIZE+1];
    bool        retval;

    switch (RetCode)
    {
    case SQL_SUCCESS_WITH_INFO:
        while (SQLGetDiagRec(hType,
                                hHandle,
                                ++iRec,
                                wszState,
                                &iError,
                                wszMessage,
                                (SQLSMALLINT)(sizeof(wszMessage) / sizeof(WCHAR)),
                                (SQLSMALLINT *)NULL) == SQL_SUCCESS)
        {
            LOG_W("DBODBC::Check - [%5.5s] %s (%d)\n", wszState, wszMessage, iError);
        }
    case SQL_SUCCESS:
        return true;
    case SQL_INVALID_HANDLE:
        LOG_W("DBODBC::Check - SQL handle is invalid");
        return false;
        break;
    case SQL_ERROR:
        while (SQLGetDiagRec(hType,
                                hHandle,
                                ++iRec,
                                wszState,
                                &iError,
                                wszMessage,
                                (SQLSMALLINT)(sizeof(wszMessage) / sizeof(WCHAR)),
                                (SQLSMALLINT *)NULL) == SQL_SUCCESS)
        {
            LOG_W("DBODBC::Check - [%5.5s] %s (%d)\n", wszState, wszMessage, iError);
        }
        return false;
        break;
    case SQL_NO_DATA:
        //No data found, no need to log it, just return true;
        return true;
        break;
    default:
        LOG_W("DBODBC::Check - Unknown result %d", RetCode);
        return false;
    }
}

在日志中我可以看到它挂在 SQLConnect 方法调用上：

2073163264 - INFO (2) - [2020.12.11 15:13:10.728] - DBODBC::Check - Started
2073163264 - INFO (2) - [2020.12.11 15:13:10.728] - DBODBC::Check - Started
2073163264 - INFO (2) - [2020.12.11 15:13:10.729] - DBODBC::Init - Done
2073163264 - INFO (2) - [2020.12.11 15:13:10.729] - DBODBC::Connect - Started
2073163264 - INFO (2) - [2020.12.11 15:13:10.729] - DBODBC::Connect - Calling SQLConnect

此后不再记录，甚至 Check 方法中的“已启动”消息也未记录。根据 msodbcsql 文档 (https://docs.microsoft.com/en-us/sql/odbc/reference/syntax/sqlconnect-function?view=sql-server-ver15)，我们正确地使用了该库。此外，我在发行说明中找不到任何表明某些内容已更改的详细信息，我也应该升级我的应用程序。

编辑：

我删除了当前版本的msodbcsql17并安装了早期版本，甚至尝试了多个版本，它根本无法工作。我们有两台服务器，其中一台仍在 17.4.2.1-1 版本的 msodbcsql17 上，应用程序运行正常。其他服务器默认安装了新的17.6.1.1-1版本，应用无法运行，降级到17.4.2.1-1版本后无法运行

Answer 1

好吧，我似乎错过了我不知何故所做的一项检查：odbcinst.ini 实际上已经改变了！在 17.6 msodbc 安装期间，删除了一行。再次添加后，立即开始运行：

为什么删除了这一行，我不知道。或者，在全新安装的情况下，此行从未添加到 odbcinst.ini。不管怎样，现在可以了。

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