使用自定义的类CSetODBC(二)

何志丹

1,利用SQL词句理论上可以使用任何数据库,以sql为例.

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2,使用方法
void CTestODBCDlg::OnUseSql() 
{
CSetODBC dlg;
dlg.SetFileName( "f://setodbc.con");
dlg.SetAppName("test");
const CString strConnect = dlg.GetConnectStr();//获得连接串

CString strSQL;
CDatabase db;
db.OpenEx(strConnect);//打开数据库

{//追加记录
strSQL = "insert into character(Name,Country,Age) values(/'he/',/'china/',24)";
db.ExecuteSQL(strSQL);
}

{//删除记录
strSQL.Format("delete from character where Age = %d",24);
db.ExecuteSQL(strSQL);
}

{//修改记录
strSQL.Format("update character set age = 25 where name = /'he/'");
db.ExecuteSQL(strSQL);
}
//显示所有记录
{
CString strOutPut ;
CRecordset rs(&db);
rs.Open(CRecordset::snapshot,"select * from character");
int nField = rs.GetODBCFieldCount();
while(!rs.IsEOF())
{
for(int i = 0 ; i < nField ; i++)
{
CString strTemp;
rs.GetFieldValue((short)i,strTemp);
strTemp.TrimLeft();
strTemp.TrimRight();
strOutPut +=(strTemp + '/t');
}
strOutPut += "/n";
rs.MoveNext();
}
rs.Close();
AfxMessageBox(strOutPut);
}

db.Close();

}

3,相关信息记录在f://setodbc.con,其内容为:
[test]
DSN=testodbc_sql 
UID=sa
PWD=


4,如果用户想重新设置ODBC,则:
void CTestODBCDlg::OnResetOdbc() 
{
CSetODBC dlg;
dlg.SetFileName( "f://setodbc.con");
dlg.SetAppName("test");
const CString strConnect = dlg.GetConnectStr(true);//重新设置ODBC
}