VC++数据库学习笔记：ADO:: Connection 对象

VC++数据库学习笔记：

ADO:: Connection 对象

Attributes 属性

错误提示：“在事务处理过程中,连接对对象不能被明确地切断。“

pConnect->PutAttributes(adXactCommitRetaining);//这里不能修改连接对象的属性，不然会处理事备时会出错。

nAttrib = pConnect->GetAttributes();

cout<<"Attrib:"<<nAttrib<<endl;

cout<<"Provider:"<<(LPCSTR)pConnect->Provider<<endl;

cout<<"State:"<<pConnect->State<<endl;

cout<<"version:"<<(LPCSTR)pConnect->Version<<endl;

pConnect->BeginTrans();

pConnect->Execute("delete From employees where emp_id = 1",&vtMissing,adCmdText);

pConnect->CommitTrans();

BeginTrans不能嵌套，只能处理单一的事务

pConnect->BeginTrans()

pConnect->CommitTrans()

pConnection->Close() 不能处理已经关闭的对象，不然出错。