前台HTML代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
<h1>添加商品</h1>
<asp:Button ID="Button1" runat="server" Text="姓名" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
<br />
<br />
<asp:Button ID="Button2" runat="server" Text="价格" />
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
<br />
<br />
<br />
<asp:Button ID="Button3" runat="server" Text="添加" OnClick="Button3_Click" />
<asp:Button ID="Button4" runat="server" OnClick="Button4_Click" Text="随机" />
<br />
</form>
</body>
</html>
后台C#代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button3_Click(object sender, EventArgs e)
{
//取值
string name = TextBox1.Text;
decimal price = Convert.ToDecimal(TextBox2.Text);
TestDataContext context = new TestDataContext();
string code = "";
//流水号的格式 取当前的日期时间 取出他的年月日
//查商品表有没有Code
if (context.ShangPin.Count() == 0)
{
code = DateTime.Now.ToString("yyyyMMdd") + "001";
}
else
{
//找到数据库Code列最大的数据 截取后三位+1
string max = context.ShangPin.Max(p=>p.Code);
//截取字符串
string max1 = max.Substring(8,3);
//截取字符串
string rq = max.Substring(8);
if (rq == DateTime.Now.ToString("yyyyMMdd")) //如果想等 就是同一天
{
//转成整型
int max2 = Convert.ToInt32(max1);// 若果是同一天 执行
max2 = max2 + 1;
if (max2 < 10)
{
code = DateTime.Now.ToString("yyyyMMdd") + "00" + max2;
}
else if (max2 < 100)
{
code = DateTime.Now.ToString("yyyyMMdd") + "0" + max2;
}
else
{
code = DateTime.Now.ToString("yyyyMMdd") + max2;
}
}
//执行到这
else //不是同一天 重新开始
{
code = DateTime.Now.ToString("yyyyMMdd") + "001";
}
}
//添加数据 先造一个ShangPin对象
ShangPin data = new ShangPin();
//赋值
data.Code = code;
data.Name = name;
data.Price = price;
context.ShangPin.InsertOnSubmit(data);
context.SubmitChanges();
}
protected void Button4_Click(object sender, EventArgs e)
{
TestDataContext context = new TestDataContext();
string name = TextBox1.Text;
decimal price = Convert.ToDecimal(TextBox2.Text);
//定义一个随机数
Random rd = new Random();
//生成1000以内的以为随机数
string code = DateTime.Now.ToString("yyyyMMddHHmmss")+rd.Next(1000);
//添加数据 先造一个ShangPin对象
ShangPin data = new ShangPin();
//赋值
data.Code = code;
data.Name = name;
data.Price = price;
context.ShangPin.InsertOnSubmit(data);
context.SubmitChanges();
}
}
SQL显示：
