WB AJax 例子2 第二种方法

前台代码不变 ， 后台C#　　代码需要建一个类  网页显示效果不变

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;

/// <summary>
/// DB 的摘要说明
/// </summary>
public class DB
{
	public DB()
	{
		//
		// TODO: 在此处添加构造函数逻辑
		//
	}

    public string SqlDB(string database, string type, string sql)
    {
        string connstring = "server=.;database=" + database + ";uid=sa;pwd=123";
        SqlConnection conn = new SqlConnection(connstring);

        SqlCommand cmd = conn.CreateCommand();
        cmd.CommandText = sql;

        string shuju = "";
        conn.Open();
        if (type == "CX")
        {
            SqlDataReader _dr = cmd.ExecuteReader();
            while (_dr.Read())
            {
                for (int i = 0; i < _dr.FieldCount; i++)
                {
                    shuju += _dr[i].ToString() + "^";
                }
                shuju = shuju.Substring(0, shuju.Length - 1);
                shuju += "|";
            }
            shuju = shuju.Substring(0, shuju.Length - 1);

        }
        else
        {
            int a = cmd.ExecuteNonQuery();

            if (a > 0)
            {
                shuju = "成功！";
            }
            else
            {
                shuju = "失败！";
            }
        }
        conn.Close();

        return shuju;
    }
}

　　然后 Select页面 也要变：

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

public class Select : IHttpHandler {

    public void ProcessRequest (HttpContext context) {
        //取值
        string name = context.Request["name"].ToString();
        //用类的方法
        //做一个SQL语句
        string sql = "select *from Info where name like ‘%" + name + "%‘";
        //调DB类里面的函数
        DB cmd = new DB();
        //函数需要三个参数 返回一个字符串
        string shuju = cmd.SqlDB("mydb", "CX", sql);
        //把字符串写出去
        context.Response.Write(shuju);
        context.Response.End();

    }

    public bool IsReusable {
        get {
            return false;
        }
    }