[英]Connect to sql server 2017 failed but return null error information when using c++ ADO
My environment is: Windows 10 , Microsoft SQL Server 2017 Developer Edition. 我的环境是:Windows 10,Microsoft SQL Server 2017 Developer Edition。
I'm using c++ ADO to connect to sql server, but when it is connecting to the server, it throw an error, but return null error information. 我正在使用c ++ ADO连接到sql server,但是当它连接到服务器时,它会抛出一个错误,但返回null错误信息。
Below is my codes, 以下是我的代码,
// ms_connection.h
#import "C:\Program Files (x86)\Common Files\system\ado\msado15.dll" no_namespace rename("EOF","adoEOF")rename("BOF","adoBOF")
class MSConnection
{
public:
virtual void init();
virtual void connect();
private:
_ConnectionPtr m_connection;
};
// ms_connection.cpp
#include "ms_connection.h"
void MSConnection::init()
{
try
{
m_connection.CreateInstance("ADODB.Connection");
}
catch (_com_error e)
{
LOG_ERROR << "MSConnection failed when try to init the object, " << (const char*)e.Description();
throw (const char*)e.Description();
}
}
void MSConnection::connect()
{
try
{
m_connection->Open(L"Provider=SQLOLEDB;Data Source=127.0.0.1, 1443;", L"root", L"haiwell", adModeUnknown);
}
catch (_com_error e)
{
LOG_ERROR << "MSConnection failed when try to connect to the server, " << (const char*)e.Description();
throw (const char*)e.Description();
}
}
When execute the init()
and connect()
, I found an error in log, 执行
init()
和connect()
,我在日志中发现错误,
2019-05-15 11:00:18.343 ERROR [14408] [MSConnection::connect@36] MSConnection failed when try to connect to the server, (null)
I have restarted my computer and sql server, but the problem is still existed. 我已经重新启动了我的计算机和SQL服务器,但问题仍然存在。
Could someone give me any advice? 有人可以给我任何建议吗? Why is it so strange?
为什么这么奇怪?
Thanks a lot in advance. 非常感谢提前。
Just add ::CoInitialize(NULL);
只需添加
::CoInitialize(NULL);
in the same function of Open
, will be ok. 在
Open
的相同功能中, Open
都会好的。
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