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C/C++ code:
#include "stdafx.h"

#include <windows.h>

#include <windowsx.h>

#include <sql.h>

#include <sqlext.h>

#include <sqltypes.h>

#include "resource.h"

#include "MainDlg.h"

#define LOGIN_TIMEOUT 30

#define MAXBUFLEN 255

#define CHECKDBSTMTERROR(hwnd,result,hstmt) if(SQL_ERROR==result){ShowDBStmtError(hwnd,hstmt);return;}


void ShowDBError(HWND hwnd,SQLSMALLINT type,SQLHANDLE sqlHandle)

{

char pStatus[10], pMsg[101];

SQLSMALLINT SQLmsglen;

char error[200] = {0};

SQLINTEGER SQLerr;

long erg2 = SQLGetDiagRec(type, sqlHandle,1,

(SQLCHAR *)pStatus,&SQLerr,(SQLCHAR *)pMsg,100,&SQLmsglen);

wsprintf(error,"%s (%d)\n",pMsg,(int)SQLerr);

MessageBox(hwnd,error,TEXT("Êý¾Ý¿âÖ´ÐдíÎó"),MB_ICONERROR|MB_OK);

}

void ShowDBConnError(HWND hwnd,SQLHDBC hdbc)

{

ShowDBError(hwnd,SQL_HANDLE_DBC,hdbc);

}

void ShowDBStmtError(HWND hwnd,SQLHSTMT hstmt)

{

ShowDBError(hwnd,SQL_


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String sqlCount="select count(*) from usertable where username='"+
userName+"'";Õâ¾ä»° ʲôÒâ˼°¡£¡
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select count(*) from usertable where username='ÄãµÄ±äÁ¿ ......

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#include "stdlib.h"
#include "math.h"
#include "stdio.h"
float objfx(float x[]);
void constraint(float x[],float g ......
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