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C++访问SQLServer数据库,该怎么解决

发布时间: 2012-03-09 21:42:54 作者: rapoo

C++访问SQLServer数据库
我想写一个纯C++的程序,就是不用vc提供的MFC等类库,只用标准的C++库!现在想访问MSSQLServer数据库。该怎么做呢?如果有例子提供,小弟不胜感谢!

[解决办法]
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[10]; //学号
  char sname[10]; //姓名
  char ssex[2]; //姓别
  long sage; //年龄
  char smajor[20]; //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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