C#數據庫連接類

/// <summary>
/// dataset ds =new dataset();
/// string sql="select * from [user]";
/// ds=dodatabase.getdataset(sql);
/// datagrid1.datasource=ds.tables[0].defaultview;
///以上四行爲用02wangluo數據庫中user表來填充dataset後綁定到datagrid1
///這是調用的getdataset方法-->此方法主要面對的是查(select)
/// </summary>
public class AccessDB
{
 public AccessDB()
 {
 //
 // todo: 在此處添加構造函數邏輯
 //
 }
 public static  DataSet getdataset(string sql)
 {
  SqlConnection conn=new SqlConnection();
  DataSet ds=new DataSet();
  try
  {
  conn=new SqlConnection("server=130.199.100.160;uid=scdacf;pwd=scdacfhrsrs;database=hrs_acf");
  SqlDataAdapter sda=new SqlDataAdapter(sql,conn);
  sda.Fill(ds);
  return ds;
  }
  catch(Exception ex)
  {
  throw(ex);
  }
  finally
  {    
  conn.Close();
  }
 }
 public static int executesql(string sql)
 {
  SqlConnection conn=new SqlConnection();
  try
  {
  conn=new SqlConnection("server=130.199.100.160;uid=scdacf;pwd=scdacfhrsrs;database=hrs_acf");
  SqlCommand sqlcmd =new SqlCommand(sql,conn);
  conn.Open();
  return sqlcmd.ExecuteNonQuery();
  }
  catch(Exception ex)
  {
  throw ex;
  }
  finally
  {
  conn.Close();
  }
  }
}