黑马程序员学习12

 

自己编写的database类，在ado.net中调用
public class DataBase
{
    SqlConnection objConnection = null;
    public DataBase()
    {
        //string ConnectionStr = System.Configuration.ConfigurationSettings.AppSettings["ConnectionStr"].ToString();
        //string ConnectionStr = "Data Source=OEM-20120427JSK;Initial Catalog=test;Integrated Security=True";
        objConnection = new SqlConnection(ConnectionStr);
       
    }
    public void doExe(string sql)
    {
        objConnection.Open();
        SqlCommand cmd = new SqlCommand(sql, objConnection);
        cmd.ExecuteNonQuery();
    }

    public DataTable doSelect(string sql)
    {
        objConnection.Open();
        SqlDataAdapter userInfoDAP = new SqlDataAdapter(sql, objConnection);
        DataTable dt = new DataTable();
        userInfoDAP.Fill(dt);
        return dt;
    }

    public void close()
    {
        objConnection.Close();
    }
}