ef 增删改教程
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好了,废话不说了,能看到这篇文章的,应该都是想知道EF的一些增删改查的操作,所以,应该也是知道EF的一些优点。鉴于也有可能有新手可能第一次使用,我就简略讲一下他的优点。EF的优点,本次讲到的就是,他对数据库的操作集成的非常简单,对指定的表操作的话,只需要一个简单的add或者remove即可,非常简洁。好下面就按着教程来,一步一步往下走。
这次,我们用的是DB first模式。
一、首先要做的事情,就是新建数据库了,这次我们用到的数据库名为:Student,表明为:User,下面的是数据库的生成操作:
USE [master]GO/****** Object: Database [Student] Script Date: 05/20/2016 11:36:27 ******/CREATE DATABASE [Student] ON PRIMARY( NAME = N‘Student‘, FILENAME = N‘F:Jeffrey9061SVNDBStudent.mdf‘ , SIZE = 3072KB , MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB )LOG ON( NAME = N‘Student_log‘, FILENAME = N‘F:Jeffrey9061SVNDBStudent_log.ldf‘ , SIZE = 1024KB , MAXSIZE = 2048GB , FILEGROWTH = 10%)GOALTER DATABASE [Student] SET COMPATIBILITY_LEVEL = 100GOIF (1 = FULLTEXTSERVICEPROPERTY(‘IsFullTextInstalled‘))beginEXEC [Student].[dbo].[sp_fulltext_database] @action = ‘enable‘endGOALTER DATABASE [Student] SET ANSI_NULL_DEFAULT OFFGOALTER DATABASE [Student] SET ANSI_NULLS OFFGOALTER DATABASE [Student] SET ANSI_PADDING OFFGOALTER DATABASE [Student] SET ANSI_WARNINGS OFFGOALTER DATABASE [Student] SET ARITHABORT OFFGOALTER DATABASE [Student] SET AUTO_CLOSE OFFGOALTER DATABASE [Student] SET AUTO_CREATE_STATISTICS ONGOALTER DATABASE [Student] SET AUTO_SHRINK OFFGOALTER DATABASE [Student] SET AUTO_UPDATE_STATISTICS ONGOALTER DATABASE [Student] SET CURSOR_CLOSE_ON_COMMIT OFFGOALTER DATABASE [Student] SET CURSOR_DEFAULT GLOBALGOALTER DATABASE [Student] SET CONCAT_NULL_YIELDS_NULL OFFGOALTER DATABASE [Student] SET NUMERIC_ROUNDABORT OFFGOALTER DATABASE [Student] SET QUOTED_IDENTIFIER OFFGOALTER DATABASE [Student] SET RECURSIVE_TRIGGERS OFFGOALTER DATABASE [Student] SET DISABLE_BROKERGOALTER DATABASE [Student] SET AUTO_UPDATE_STATISTICS_ASYNC OFFGOALTER DATABASE [Student] SET DATE_CORRELATION_OPTIMIZATION OFFGOALTER DATABASE [Student] SET TRUSTWORTHY OFFGOALTER DATABASE [Student] SET ALLOW_SNAPSHOT_ISOLATION OFFGOALTER DATABASE [Student] SET PARAMETERIZATION SIMPLEGOALTER DATABASE [Student] SET READ_COMMITTED_SNAPSHOT OFFGOALTER DATABASE [Student] SET HONOR_BROKER_PRIORITY OFFGOALTER DATABASE [Student] SET READ_WRITEGOALTER DATABASE [Student] SET RECOVERY FULLGOALTER DATABASE [Student] SET MULTI_USERGOALTER DATABASE [Student] SET PAGE_VERIFY CHECKSUMGOALTER DATABASE [Student] SET DB_CHAINING OFFGOEXEC sys.sp_db_vardecimal_storage_format N‘Student‘, N‘ON‘GOUSE [Student]GO/****** Object: Table [dbo].[User] Script Date: 05/20/2016 11:36:27 ******/SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER ONGOCREATE TABLE [dbo].[User]([ID] [int] IDENTITY(1,1) NOT NULL,[Name] [nvarchar](50) NULL,[Age] [int] NULL,[Sex] [nvarchar](50) NULL,CONSTRAINT [PK_User] PRIMARY KEY CLUSTERED([ID] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]GO二、新建一个asp.net的Web站点,命名为:LMX.EF.Web,如下图:选择空模板二、添加EF的ADO.NET实体数据模型,如下图:命名为:Student点击:新建连接填写本地SQL数据库的链接,然后选择:Student数据库,如下:点击“确定”点击:“下一步”选择“6.x”,这里,如果你们用的是VS2013,选“5.0”也一样。然后点击“完成”。如下图:添加实体类数据模型到此结束。三、添加增删改查页面。1,增加add.aspx2,修改edit.aspx3,列表list.aspx(包含搜索和删除)四、代码实现add.aspx 前端:<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="add.aspx.cs" Inherits="LMX.EF.Web.add" %> <!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>增加用户</title> <script src="js/jquery-1.8.3.min.js"></script> <style type="text/css"> /* 表格的样式*/ .tab { border-collapse: collapse; padding-top: 10px; padding-left: 0px; padding-right: 0px; margin: 0px; border: 1px solid #BDBCBC; } .tr { border-collapse: collapse; height: 30px; } .td { background-color: #fff; font-size: 14px; font-family: "微软雅黑"; text-align: center; border-right: 1px solid #BDBCBC; border-bottom: 1px dashed #BDBCBC; } </style> <script type="text/javascript"> $(function () { $("#btnSubmit").click(function () { var vData = $("#form1").serialize(); $.ajax({ type: ‘get‘, url: location.href + "?type=add", data: vData, success: function (msg) { alert(msg); } }) }); $("#btnList").click(function () { window.location.href = "list.aspx"; }); }) </script> </head> <body> <form id="form1"> <table class="tab"> <tr class="tr"> <td class="td">姓名</td> <td class="td"> <input type="text" name="Name" /> </td> </tr> <tr class="tr"> <td class="td">年龄</td> <td class="td"> <input type="text" name="Age" /> </td> </tr> <tr class="tr"> <td class="td">性别</td> <td class="td"> <input type="text" name="Sex" /> </td> </tr> <tr class="tr"> <td class="td"> <input type="button" id="btnList" value="返回列表" /> </td> <td class="td"> <input type="button" id="btnSubmit" value="确认提交" /> </td> </tr> </table> </form> </body> </html>
后端:using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; namespace LMX.EF.Web { public partial class add : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { if (Request.QueryString["type"] == "add") { string strName = Request.QueryString["Name"]; string strAge = Request.QueryString["Age"]; string strSex = Request.QueryString["Sex"]; using (StudentEntities ent = new StudentEntities()) { User aNewUser = new User() { Age = 20, Name = strName, Sex = strSex }; ent.User.Add(aNewUser); if (ent.SaveChanges() > 0) { Response.Write("添加成功。"); } else { Response.Write("添加失败。"); } Response.End(); } } } } } }
list.aspx 前端:<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="list.aspx.cs" Inherits="LMX.EF.Web.list" %> <!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>列表</title> <script src="js/jquery-1.8.3.min.js"></script> <style type="text/css"> /* 表格的样式*/ .tab { border-collapse: collapse; padding-top: 10px; padding-left: 0px; padding-right: 0px; margin: 0px; border: 1px solid #BDBCBC; } .tr { border-collapse: collapse; height: 30px; } .td { background-color: #fff; font-size: 14px; font-family: "微软雅黑"; text-align: center; border-right: 1px solid #BDBCBC; border-bottom: 1px dashed #BDBCBC; } </style> <script type="text/javascript"> $(function () { loadData(); //编辑用户 $("#btnEdit").click(function () { var vID = $("#UserID").val(); if (vID == "" || vID == null) { alert("请输入用户编号。"); return; } window.location.href = "edit.aspx?id=" + vID; }); //删除用户 $("#btnDel").click(function () { var vID = $("#UserID").val(); if (vID == "" || vID == null) { alert("请输入用户编号。"); return; } $.ajax({ type: ‘post‘, url: location.href + "?type=del&&id="+vID, success: function (data) { alert(data); loadData(); } }) }); //继续添加 $("#btnAdd").click(function () { window.location.href = "add.aspx"; }); }) //获取用户列表 function loadData() { var vHead = "<tr class="tr"><td class="td">编号</td><td class="td">姓名</td><td class="td">年龄</td><td class="td">性别</td></tr>"; $.ajax({ type: ‘get‘, url: location.href + "?type=loadData", success: function (data) { if (data != null) { data = JSON.parse(data); for (var i = 0; i < data.length; i++) { vHead += "<tr class="tr"><td class="td">" + data[i].ID + "</td><td class="td">" + data[i].Name + "</td><td class="td">" + data[i].Age + "</td><td class="td">" + data[i].Sex + "</td></tr>"; } } $("#tabList").html(vHead); } }) } </script> </head> <body> <table class="tab" id="tabList"> <tr class="tr"> <td class="td">编号</td> <td class="td">姓名</td> <td class="td">年龄</td> <td class="td">性别</td> </tr> </table> <br /> <input type="button" id="btnAdd" value="继续添加" /> <br /> 用户编号:<input type="text" id="UserID" /><input type="button" id="btnEdit" value="编辑" /><input type="button" id="btnDel" value="删除" /> </body> </html>
后端:using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Script.Serialization; using System.Web.UI; using System.Web.UI.WebControls; namespace LMX.EF.Web { public partial class list : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { if (Request.QueryString["type"] == "loadData") { using (StudentEntities ent = new StudentEntities()) { List<User> userList = ent.User.ToList(); JavaScriptSerializer js = new JavaScriptSerializer(); string strJsonData = js.Serialize(userList); Response.Write(strJsonData); Response.End(); } } if (Request.QueryString["type"] == "del") { string strID = Request.QueryString["id"]; int iID = int.Parse(strID); using (StudentEntities ent = new StudentEntities()) { User aUser = (from c in ent.User where c.ID == iID select c).FirstOrDefault(); if (aUser != null) { ent.User.Remove(aUser); if (ent.SaveChanges() > 0) { Response.Write("删除成功。"); } else { Response.Write("删除失败。"); } } else { Response.Write("不存在此用户,请确认用户ID是否正确。"); } Response.End(); } } } } } }
edit.aspx 前端:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="edit.aspx.cs" Inherits="LMX.EF.Web.edit" %> <!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>编辑</title> <script src="js/jquery-1.8.3.min.js"></script> <script type="text/javascript"> $(function () { $("#btnList").click(function () { window.location.href = "list.aspx"; }); }) </script> </head> <body> <form id="form1" runat="server"> <table class="tab"> <tr class="tr"> <td class="td">姓名</td> <td class="td"> <asp:TextBox ID="Name" runat="server"></asp:TextBox> <asp:TextBox ID="id" runat="server" Visible="False"></asp:TextBox> </td> </tr> <tr class="tr"> <td class="td">年龄</td> <td class="td"> <asp:TextBox ID="Age" runat="server"></asp:TextBox> </td> </tr> <tr class="tr"> <td class="td">性别</td> <td class="td"> <asp:TextBox ID="Sex" runat="server"></asp:TextBox> </td> </tr> <tr class="tr"> <td class="td"> <input type="button" id="btnList" value="返回列表" /> </td> <td class="td"> <asp:Button ID="btnSubmit" runat="server" Text="确认提交" OnClick="btnSubmit_Click" /> </td> </tr> </table> </form> </body> </html>
后端:using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; namespace LMX.EF.Web { public partial class edit : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { string strID = Request.QueryString["id"]; int iID = int.Parse(strID); using (StudentEntities ent = new StudentEntities()) { User aUser = (from c in ent.User where c.ID == iID select c).FirstOrDefault(); if (aUser != null) { Name.Text = aUser.Name; Age.Text = aUser.Age.ToString(); Sex.Text = aUser.Sex; id.Text = strID; } } } } /// <summary> /// 提交修改 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void btnSubmit_Click(object sender, EventArgs e) { string strName = Name.Text; string strAge = Age.Text; string strSex = Sex.Text; string strID = id.Text; int iID = int.Parse(strID); using (StudentEntities ent = new StudentEntities()) { User aUser = (from c in ent.User where c.ID == iID select c).FirstOrDefault(); if (aUser != null) { aUser.Name = strName; aUser.Age = 20; aUser.Sex = strSex; if (ent.SaveChanges() > 0) { Response.Write("<script>alert(‘修改成功。‘)</script>"); } } } } } }
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