用C++访问SQL Server 2000的实例
/*******************************************************************利用ADO访问MS SQL2000
要求: 【1】输出stu_info表内的每一条记录
【2】添加一条新记录
【3】删除名字为"本拉登"的记录
*/
#import "c:\Program Files\Common Files\System\ADO\msado15.dll" \
no_namespace rename("EOF", "EndOfFile")
#include ＜iostream＞
#include ＜iomanip＞ //for setw()
using namespace std;
class STU
{
public:
char snum; //学号
char sname; //姓名
char ssex; //姓别
long sage; //年龄
char smajor; //专业
public:
STU(){}
~STU(){}
};
int main()
{
STU student;
::CoInitialize(NULL); // 初始化OLE/COM库环境 ，为访问ADO接口做准备
_RecordsetPtr m_pRecordset("ADODB.Recordset");
_ConnectionPtr m_pConnection("ADODB.Connection");
_bstr_t bstrSQL("select * from stu_info"); //查询语句
char * query_cmd = "DELETE FROM stu_info WHERE sname = '本拉登'";
try
{
// 创建Connection对象
m_pConnection.CreateInstance("ADODB.Connection");
// 设置连接字符串，必须是BSTR型或者_bstr_t类型
_bstr_t strConnect= "Provider=SQLOLEDB;Server=(local);Database=student; uid=sa; pwd=123;";
//若数据库在网络上则Server为形如(192.168.1.5,3340)
//用户sa和密码123只是针对我的库
m_pConnection-＞Open(strConnect,"","",adModeUnknown);
if(m_pConnection==NULL)
cerr＜＜"Lind data ERROR!\n";
// 创建记录集对象
m_pRecordset.CreateInstance(__uuidof(Recordset));
// 取得表中的记录
m_pRecordset-＞Open(bstrSQL,m_pConnection.GetInterfacePtr(),
adOpenDynamic,adLockOptimistic,adCmdText);
_variant_t vsnum,vsname,vsage,vssex,vsmajor; //对应库中的snum,sname,sage,ssex,smajor
cout ＜＜ "学号 姓名 年龄 姓别 专业";
cout ＜＜ "\n----------------------------------------------------------------\n";
while (!m_pRecordset-＞EndOfFile)
{
vsnum = m_pRecordset-＞GetCollect(_variant_t((long)0));//这儿给字段编号和字段名都可以
vsname = m_pRecordset-＞GetCollect("sname");
vsage = m_pRecordset-＞GetCollect("sage");
vssex = m_pRecordset-＞GetCollect("ssex");
vsmajor = m_pRecordset-＞GetCollect("smajor");
if (vsnum.vt != VT_NULL && vsname.vt != VT_NULL && vsage.vt != VT_NULL
&& vssex.vt != VT_NULL && vsmajor.vt != VT_NULL)
{
cout.setf(ios::left);
cout ＜＜ setw(14) ＜＜ (char*)(_bstr_t)vsnum;
cout ＜＜ setw(14) ＜＜ (char*)(_bstr_t)vsname;
cout ＜＜ setw(8) ＜＜ vsage.lVal;
cout ＜＜ setw(8) ＜＜ (char*)(_bstr_t)vssex;
cout ＜＜setw(20) ＜＜ (char*)(_bstr_t)vsmajor;
cout.unsetf(ios::left);
cout ＜＜ endl;
}
m_pRecordset-＞MoveNext(); ///移到下一条记录
}
cout ＜＜ "\n----------------------------------------------------------------\n";
cout ＜＜ "\n请输入你要添加的学生信息\n";
cout ＜＜ "学号:";
cin ＞＞ student.snum;
cout ＜＜ "\n姓名:";
cin ＞＞ student.sname;
cout ＜＜ "\n年龄:";
cin ＞＞ student.sage;
cout ＜＜ "\n姓别:";
cin ＞＞ student.ssex;
cout ＜＜ "\n专业:";
cin ＞＞ student.smajor;
m_pRecordset-＞MoveFirst(); //移动到第一条记录
m_pRecordset-＞AddNew(); ///添加新记录
m_pRecordset-＞PutCollect("snum",_variant_t(student.snum));
m_pRecordset-＞PutCollect("sname",_variant_t(student.sname));
m_pRecordset-＞PutCollect("sage",_variant_t(student.sage));
m_pRecordset-＞PutCollect("ssex",_variant_t(student.ssex));
m_pRecordset-＞PutCollect("smajor",_variant_t(student.smajor));
m_pRecordset-＞Update();
m_pConnection-＞Execute(query_cmd,NULL,1); //用Execute执行sql语句来删除
m_pRecordset-＞Close(); // 关闭记录集
}
// 捕捉异常
catch(_com_error e)
{
// 显示错误信息
cerr ＜＜ "\nERROR:" ＜＜ (char*)e.Description();//抛出异常
}
if(m_pConnection-＞State)
m_pConnection-＞Close();
::CoUninitialize();
return 0;
}
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