使用DataAdapter填充多個表(利用DataRelation)的實例代碼

2024-07-10 13:17:16

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Default.aspx

復制代碼代碼如下:

View Code

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

Default.aspx.cs

復制代碼代碼如下:

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

using System.Data.SqlClient;
using System.Text;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string connectionString = ConfigurationSettings.AppSettings["strCon"];
        SqlConnection mycon = new SqlConnection(connectionString);//創建數據庫連接
        string sqlCategory = "select ID,C_Name from Photo_Category";//查詢相冊分類表中信息
        string sqlPhoto = "select CategoryID,Title from Photo";//查詢相冊表中信息
        SqlDataAdapter da = new SqlDataAdapter(sqlCategory, mycon);//創建數據適配器
        DataSet ds = new DataSet();//創建數據集
        try
        {
            if (mycon.State.Equals(ConnectionState.Closed))
            { mycon.Open(); }//顯式地打開數據庫連接
            da.Fill(ds, "Photo_Category");//填充相冊分類表
            da.SelectCommand.CommandText = sqlPhoto;
            da.Fill(ds, "Photo");//填充相冊信息表
        }
        finally
        {
            mycon.Close();//顯式地關閉數據庫連接
        }
        //創建DataRelation對象，關聯表間關系
        DataRelation relat = new DataRelation("Photo_Category", ds.Tables["Photo_Category"].Columns["ID"],ds.Tables["Photo"].Columns["CategoryID"]);
        ds.Relations.Add(relat);//添加表間關系
        StringBuilder builder = new StringBuilder("");
        foreach (DataRow row in ds.Tables["Photo_Category"].Rows)
        {
            builder.Append("<b>");
            builder.Append(row["C_Name"].ToString());
            builder.Append("</b><ul>");
            DataRow[] childRows = row.GetChildRows(relat);
            foreach (DataRow childRow in childRows)
            {
                builder.Append("<li>");
                builder.Append(childRow["Title"].ToString());
                builder.Append("</li>");
            }
            builder.Append("</ul>");
        }
        lbText.Text += builder.ToString();//將運行結果輸出到頁面中
    }