fatal error LNK1120: 2 个无法解析的外部命令,该怎么处理

fatal error LNK1120: 2 个无法解析的外部命令
USers.cpp
// Users.cpp: implementation of the CUsers class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "kuncunxinxiguanl.h"
#include "Client.h"
#include "Users.h"
#include "ADOConn.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
#if !defined(AFX_CLIENT_H__C210C883_216F_4A4E_BB2F_F034570AA92F__INCLUDED_)
#define AFX_CLIENT_H__C210C883_216F_4A4E_BB2F_F034570AA92F__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CUsers::CUsers()
{
UserName = "";
Pwd = "";
User_type = 0;
}

CUsers::~CUsers()
{

}

CString CUsers::GetUserName()
{
return UserName;
}

void CUsers::SetUserName(CString cUserName)
{
UserName = cUserName;
}

CString CUsers::GetPwd()
{
return Pwd;
}

void CUsers::SetPwd(CString cPwd)
{
Pwd = cPwd;
}

int CUsers::GetUser_type()
{
return User_type;
}

void CUsers::SetUser_type(int iUser_type)
{
User_type = iUser_type;
}

//数据库操作
int CUsers::HaveName(CString cUserName)
{
//连接数据库
ADOConn m_AdoConn;
m_AdoConn.OnInitADOConn();
//设置SELECT语句
_bstr_t vSQL;
vSQL = "SELECT * FROM Users WHERE UserName='" + cUserName + "'";

//执行SELECT语句
_RecordsetPtr m_pRecordset;
m_pRecordset = m_AdoConn.GetRecordSet(vSQL);
if (m_pRecordset->adoEOF)
return -1;
else
return 1;

//断开与数据库的连接
m_AdoConn.ExitConnect();
}


void CUsers::sql_insert()
{
//连接数据库
ADOConn m_AdoConn;
m_AdoConn.OnInitADOConn();
//设置INSERT语句
CString strType;
strType.Format("%d", User_type);

_bstr_t vSQL;
vSQL = "INSERT INTO Users VALUES('" + UserName + "','" + Pwd + "'," 
+ strType + ")";
//执行INSERT语句
m_AdoConn.ExecuteSQL(vSQL);
//断开与数据库的连接
m_AdoConn.ExitConnect();
}

void CUsers::sql_updatePwd(CString cUserName)
{
//连接数据库
ADOConn m_AdoConn;
m_AdoConn.OnInitADOConn();
//设置UPDATE语句
CString strType;
strType.Format("%d", User_type);

_bstr_t vSQL;
vSQL = "UPDATE Users SET Pwd='" + Pwd + "' WHERE UserName='" + cUserName + "'";
//执行UPDATE语句
m_AdoConn.ExecuteSQL(vSQL);
//断开与数据库的连接
m_AdoConn.ExitConnect();
}

void CUsers::sql_delete(CString cUserName)
{
//连接数据库
ADOConn m_AdoConn;
m_AdoConn.OnInitADOConn();
//设置DELETE语句
_bstr_t vSQL;
vSQL = "DELETE FROM Users WHERE UserName='" + cUserName + "'";
//执行DELETE语句
m_AdoConn.ExecuteSQL(vSQL);
//断开与数据库的连接
m_AdoConn.ExitConnect();
}

//根据员工编号读取所有字段值
void CUsers::GetData(CString cUserName)
{
//连接数据库
ADOConn m_AdoConn;
m_AdoConn.OnInitADOConn();
//设置SELECT语句
_bstr_t vSQL;
vSQL = "SELECT * FROM Users WHERE UserName='" + cUserName + "'";
//执行SELETE语句
_RecordsetPtr m_pRecordset;
m_pRecordset = m_AdoConn.GetRecordSet(vSQL);

//返回各列的值
if (m_pRecordset->adoEOF)
CUsers();
else
{
UserName = cUserName;
Pwd = (LPCTSTR)(_bstr_t)m_pRecordset->GetCollect("Pwd");
User_type = atoi((LPCTSTR)(_bstr_t)m_pRecordset->GetCollect("User_type"));