DataAdapter对象的Update方法批量更新(UpdateCommand)

Default.aspx

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<%@ 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">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>

Default.aspx.cs

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View Code 

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;
//引入命名空间
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //创建数据库连接对象
        SqlConnection con = new SqlConnection(ConfigurationSettings.AppSettings["strCon"]);
        //创建数据适配器
        SqlDataAdapter da = new SqlDataAdapter("select ID,Name,Price from bccd", con);
        DataSet ds = new DataSet();//创建数据集
        da.Fill(ds, "Bccd");//填充数据集
        //调用自定义方法ShowDsTable显示未更新前的数据信息
        ShowDsTable(ds.Tables[0]);
        //清空内存表中数据
        ds.Tables.Clear();
        //给SqlDataAdapter的UpdateCommand属性指定执行更新操作的SQL语句
        da.UpdateCommand = new SqlCommand("update bccd set Name = @Name where ID=@id", con);
        //添加参数并赋值
        da.UpdateCommand.Parameters.Add("@Name", SqlDbType.NVarChar, 800, "Name");
        SqlParameter prams_ID = da.UpdateCommand.Parameters.Add("@id", SqlDbType.Int);
        prams_ID.SourceColumn = "ID";
        prams_ID.SourceVersion = DataRowVersion.Original;
        //填充数据集
        da.Fill(ds, "Bccd");
        //应用一个for循环更改数据集ds的MRBccd表中brccdName列的值
        for (int i = 0; i <= ds.Tables["Bccd"].Rows.Count-1; i++)
        {
            ds.Tables["Bccd"].Rows[i]["Name"] += DateTime.Today.ToShortDateString();
        }
        //调用Update方法提交更新后的数据集ds,并同步更新数据库数据
        da.Update(ds, "Bccd");
        //调用自定义方法ShowDsTable显示更新后的数据
        ShowDsTable(ds.Tables[0]);
    }
    public void ShowDsTable(DataTable dataTable)
    {
        foreach (DataRow row in dataTable.Rows)
        {
            //输出表格
            Response.Write("<table border=1 align='center' ");
            Response.Write("<tr><th>编号</th><th>名称</th><th>价格</th></tr>");
            Response.Write("<tr>");
            for (int i = 0; i < dataTable.Columns.Count; i++)
            {
                //按照顺序以列名指定要读取的项
                Response.Write("<td align='center'>" + row[i] + "</td>");
            }
            Response.Write("</tr>");
            Response.Write("</table>");
        }
    }
}

posted on 2013-03-12 02:15 松竹梅阅读(822) 评论(0) 编辑收藏举报