c# 中dataset的使用

查询数据的源代码：

string conString="data source=127.0.0.1;database=test;user id=sa;password=123"; string strSQL="select * from student"; SqlConnection myConnection=new SqlConnection(conString); DataSet ds=new DataSet(); myConnection.Open(); SqlDataAdapter adapter=new SqlDataAdapter(strSQL,myConnection); adapter.Fill(ds,"ds"); myconnection.Close();

封装后的代码是：

public static DataSet Query(string StrSql) { using (SqlConnection connection = new SqlConnection(myConStr)) { DataSet ds = new DataSet(); connection.Open(); SqlDataAdapter command = new SqlDataAdapter(StrSql,connection); command.Fill(ds,"ds"); return ds; } }
使用的方法： private void button2_Click(object sender, EventArgs e) { string StrQuery = "select * from student"; DataSet ds = OperateDatabase.Query(StrQuery); for (int i = 0; i < ds.Tables[0].Rows.Count; i++) { string j = ds.Tables[0].Rows[i][0].ToString(); MessageBox.Show(j); } }