vs2012用C连接sql server2008失败了

[买柴火的小火柴]

 #include <stdio.h>
#include <iostream>
#include <string.h>
#include <windows.h>
#include <sql.h>
#include <sqlext.h>
#include <odbcss.h>

using namespace std;

#define MAXBUFLEN   255	
#define MaxNameLen  20

//下面这句是预处理语句，使程序在编译时分别编译绑定段或SQLGetdata段
//#define SQLBINDCOL

SQLHENV      henv = SQL_NULL_HENV;//定义环境句柄
SQLHDBC      hdbc1 = SQL_NULL_HDBC;//定义数据库连接句柄     
SQLHSTMT      hstmt1 = SQL_NULL_HSTMT;//定义语句句柄

int main() 
{
	RETCODE retcode;//错误返回码
	
    // Allocate the ODBC Environment and save handle.
	retcode = SQLAllocHandle (SQL_HANDLE_ENV, NULL, &henv);	
	if(retcode < 0 )//错误处理
	{
		cout<<"allocate ODBC Environment handle errors."<<endl;
		return -1;
	}

	// Notify ODBC that this is an ODBC 3.0 application.
	retcode = SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION,
		(SQLPOINTER) SQL_OV_ODBC3, SQL_IS_INTEGER);
	if(retcode < 0 ) //错误处理
	{
		cout<<"the  ODBC is not version3.0 "<<endl;
		return -1;
	}
	
	// Allocate an ODBC connection and connect.
	retcode = SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc1);
	if(retcode < 0 ) //错误处理
	{
		cout<<"allocate ODBC connection handle errors."<<endl;
		return -1;
	}

	//Data Source Name must be of type User DNS or System DNS
	char* szdDSN = "Test";
	char* szUID = "sa";//log name
	char* szAuthStr ="123";//passward

	
	//connect to the Data SourceW
	retcode=SQLConnect(hdbc1,(SQLWCHAR*)szdDSN,(SWORD)strlen(szdDSN),(SQLWCHAR*)szUID, (SWORD)strlen(szUID),(SQLWCHAR*)szAuthStr, (SWORD)strlen(szAuthStr));
	if(retcode < 0 ) //错误处理
	{		
//******************************************程序在这里结束，下面代码可以先不看
		cout<<"connect to  ODBC datasource errors."<<endl;
		return -1;
	}

	// Allocate a statement handle.
	retcode = SQLAllocHandle(SQL_HANDLE_STMT, hdbc1, &hstmt1);
	if(retcode < 0 ) //错误处理
	{
		cout<<"allocate ODBC statement handle errors."<<endl;
		return -1;
	}
	
	// Execute an SQL statement directly on the statement handle.每一句后面都跟了一个错误处理，当发生错误时可以很方便的判断错在哪里
	

	retcode = SQLExecDirect(hstmt1,(SQLWCHAR*)"select sname,city  FROM product", SQL_NTS);
	if(retcode < 0 )
	{
		cout<<"Executing statement  throught ODBC  errors."<<endl;
		return -1;
	}

	// SQLBindCol variables
	SQLCHAR      city[MaxNameLen + 1];	
	SQLCHAR		 name[MaxNameLen + 1];
	SQLINTEGER   columnLen = 0;//数据库定义中该属性列的长度

#ifdef SQLBINDCOL
	
//游标已被封装在其中，一开始把两个列号分别写为provider中的列号2（name），4（city），结果name的值为city的值，city的值为烫烫烫烫烫烫烫烫，这才发现第二个参数应为游标中的列号，而不是表中的列号，
	retcode = SQLBindCol(hstmt1, 1, SQL_C_CHAR,name,MaxNameLen , &columnLen); 
	retcode = SQLBindCol(hstmt1, 2, SQL_C_CHAR,city,MaxNameLen , &columnLen);
	while ( (retcode = SQLFetch(hstmt1) ) != SQL_NO_DATA) 
	{		
		if(columnLen>0)
			printf("name = %s  city = %s\n", name,city);
		else
			printf("name = %s  city = NULL\n", name,city);
	}
	
#else
	
	while(1 )
	{
		retcode = SQLFetch(hstmt1);
		if(retcode == SQL_NO_DATA)
			break;
		
		retcode = SQLGetData(hstmt1, 1, SQL_C_CHAR, name, MaxNameLen, &columnLen);
		retcode = SQLGetData(hstmt1, 2, SQL_C_CHAR, city, MaxNameLen, &columnLen);		
		if(columnLen>0)
			printf("name = %s  city = %s\n", name,city);
		else
			printf("name = %s  city = NULL\n", name,city);
		
	}

#endif

	/* Clean up.*/
	SQLFreeHandle(SQL_HANDLE_STMT, hstmt1);
	SQLDisconnect(hdbc1);
	SQLFreeHandle(SQL_HANDLE_DBC, hdbc1);
	SQLFreeHandle(SQL_HANDLE_ENV, henv);
	
	return(0);
}

[买柴火的小火柴]

数据库方面， 我直接打开sql server 2008，运行如下语句 CREATE TABLE mytable ( id char (10) primary key, name char (10), phone char (10) ) insert into mytable values('001','wang',123456) insert into mytable values('002','zhang',123456) insert into mytable values('003','Li',123456)

[买柴火的小火柴]

ODBC方面，添加了一个 驱动程序选了sql server 创建一个test,其他都默认

[买柴火的小火柴]

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