MVC日记的增删改方法实现

这里我就不过多介绍数据库了,根据实体模型层自行设计数据库就好

首先创建实体模型层

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MVC.Notes.DataModel
{
public class NotesDataModel
{
public int Id { get; set; }
public string Title { get; set; }
public string Content { get; set; }
public int CId { get; set; }
public DateTime Times { get; set; }
public bool Gk { get; set; }
public string CFl { get; set; }
}
}

创建ado调用连接数据库的帮助类,这里你需要自行改动你自己创建的数据库名字,及登录账号及密码,话不多说,直接上代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;
using System.Data;
using System.Reflection;
using System.Net;
using System.Net.Sockets;

namespace MVC.Notes.DAL
{
public class DBHelper
{
private SqlConnection conn = null;
///

/// 构造函数
///

public DBHelper()
{
if (conn == null)
{
conn = new SqlConnection("Data Source=.;Initial Catalog=NotesDB;Integrated Security=True");
}
}
///

/// 返回DataTable查询结果
///

///
///
///
public DataTable GetTable(string sql, SqlParameter[] par = null)
{
try
{
SqlCommand com = new SqlCommand(sql, conn);
if (par != null)
{
com.Parameters.AddRange(par);
}
SqlDataAdapter ada = new SqlDataAdapter(com);
DataTable dt = new DataTable();
ada.Fill(dt);
ada.Dispose();
if (conn.State == ConnectionState.Open)
{
this.Close();
}
return dt;
}
catch (Exception ex)
{
if (conn.State == ConnectionState.Open)
{
this.Close();
}
throw;
}
}
///

/// 返回List查询结果
///

///
///
///
public List GetToList(string sql, SqlParameter[] par = null)
{
List li = DataTableToList(GetTable(sql));
return li;
}
///

/// 返回查询结果首行首列
///

///
///
///
public object ExecuteScalar(string sql, SqlParameter[] par = null)
{
try
{
this.Open();
SqlCommand com = new SqlCommand(sql, conn);
if (par != null)
{
com.Parameters.AddRange(par);
}
return com.ExecuteScalar();
}
catch (Exception ex)
{
this.Close();
throw;
}
}
///

/// 返回执行结果受影响行数
///

///
///
///
public int ExecuteNonQuery(string sql, SqlParameter[] par = null)
{
try
{
this.Open();
SqlCommand com = new SqlCommand(sql,conn);
if (par != null)
{
com.Parameters.AddRange(par);
}
return com.ExecuteNonQuery();
}
catch (Exception ex)
{
this.Close();
throw;
}
}
///

/// Table转list集合
///

///
///
private static List DataTableToList(DataTable dt)
{
//初始化值
List result = new List();
for (int i = 0; i < dt.Rows.Count; i++)
{
T _t = (T)Activator.CreateInstance(typeof(T));
PropertyInfo[] propertys = _t.GetType().GetProperties();
foreach (PropertyInfo pro in propertys)
{
for (int j = 0; j < dt.Columns.Count; j++)
{
if (pro.Name.Equals(dt.Columns[j].ColumnName))
{
if (dt.Rows[i][j] != DBNull.Value)
{
pro.SetValue(_t, dt.Rows[i][j], null);
}
else
{
pro.SetValue(_t, null, null);
}
break;
}
}
}
result.Add(_t);
}
return result;
}
///

/// 打开数据库链接
///

private void Open()
{
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
}
///

/// 关闭数据库链接
///

private void Close()
{
if (conn.State != ConnectionState.Closed)
{
conn.Dispose();
}
}
}
}

写的sql语句调用帮助类操作数据库,dal层

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MVC.Notes.DataModel;
namespace MVC.Notes.DAL
{
public class NotesDAL
{
//实例化DBHlper
DBHelper db = new DBHelper();
//下拉
public List BindSel()
{
return db.GetToList("select * from Category");
}
//添加笔记
public int Add(NotesDataModel nm)
{
string sql = $"insert into NoteBook values ('{nm.Title}','{nm.Content}',{nm.CId},'{nm.Times}',{(nm.Gk ?1:0)})";
return db.ExecuteNonQuery(sql);
}
//显示
public List Show()
{
return db.GetToList("select * from Category c join NoteBook n on c.CId=n.CId");
}
//删除 单删/批删
public int Del(string id)
{
string sql = $"delete from NoteBook where Id in ({id})";
return db.ExecuteNonQuery(sql);
}
}
}

放在控制器里的方法,一个方法用来加载页面,一个用来执行后台调用的代码,有些特定的方式只有一个方法,自行理解,不懂得可以问我

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MVC.Notes.BLL;
using MVC.Notes.DataModel;
using Webdiyer.WebControls.Mvc;
namespace MVC.Notes.UI.Controllers
{
public class NotesController : Controller
{
//实例化bll层
NotesBLL nb = new NotesBLL();
// GET: Notes
//下拉框
public void BindSel()
{
ViewBag.sl = new SelectList(nb.BindSel(), "CId", "CFl");
}
//添加笔记页面
public ActionResult AddNotes()
{
BindSel();
return View();
}
//添加笔记功能
[HttpPost]
public int AddNotes(NotesDataModel nm)
{
BindSel();
int i = nb.Add(nm);
return i;
}
//显示页面
public ActionResult Show(int index=1)
{
BindSel();
return View(nb.Show().ToPagedList(index,3));
}
//查询功能
[HttpPost]
public ActionResult Show(int id=0,string title="",int index=1)
{
BindSel();
if (id!=0)
{

return PartialView("_PartialShow", nb.Show().Where(m => m.CId == id & m.Title.Contains(title)).ToPagedList(index,3));
}
else
{
return PartialView("_PartialShow", nb.Show().Where(m => m.Title.Contains(title)).ToPagedList(index, 3));
}
}
//删除功能
public ActionResult Del(string id,int index=1)
{
BindSel();
int i = nb.Del(id);
if (i>0)
{
Response.Write("");
}
else
{
Response.Write("");
}
return PartialView("_PartialShow", nb.Show().ToPagedList(index,3));
}
}
}

还需要在mvc项目下的文件夹models里创建实体视图模型,用于在mvc中显示,这里我就不多多解释了

添加视图页面中需要写的代码,我们这里用的方法是ajax方法,也可以不用ajax书写,个人比较喜欢使用ajax方法

@{
ViewBag.Title = "AddNotes";
}
@using MVC.Notes.UI.Models;
@model NotesViewModel

添加笔记页面

@using (Ajax.BeginForm("AddNotes",new AjaxOptions { @OnSuccess="suc"}))
{

@Html.LabelFor(m => m.Title)	@Html.TextBoxFor(m => m.Title)
@Html.LabelFor(m => m.Content)	@Html.TextBoxFor(m => m.Content)
@Html.LabelFor(m => m.CId)	@Html.DropDownListFor(m => m.CId, ViewBag.sl as SelectList, "==请选择==")
@Html.LabelFor(m => m.Times)	@Html.TextBoxFor(m => m.Times)
@Html.LabelFor(m => m.Gk)	@Html.RadioButtonFor(m => m.Gk, true)是 @Html.RadioButtonFor(m => m.Gk, false, new { @checked = true })否

}

 显示视图中的代码,因为我们用的是ajax方法,所以显示或者进行查询或者删除时,需要一个分部视图来实现我们的功能,我下面写的是用于显示页面的代码

@{
ViewBag.Title = "Show";
}
@using MVC.Notes.DataModel;
@using Webdiyer.WebControls.Mvc;
@model PagedList

显示页面

@using (Ajax.BeginForm("Show", new AjaxOptions { UpdateTargetId = "divData" }))
{
@Html.DropDownList("id", ViewBag.sl as SelectList, "==请选择==")
@Html.TextBox("title")

}

@Html.Partial("_PartialShow", Model)

 分部视图的代码如下

@using MVC.Notes.DataModel;
@using Webdiyer.WebControls.Mvc;
@model PagedList

@{
if (Model != null)
{
foreach (var ss in Model)
{









}
}
}

全选	标题	内容	分类	发布时间	是否公开	操作
	@ss.Title	@(ss.Gk ? "*******" : "**********")	@ss.CFl	@ss.Times	@(ss.Gk ? "是" : "否")	@Ajax.ActionLink("删除", "Del", new { @id = ss.Id }, new AjaxOptions { UpdateTargetId = "divData", Confirm = "确认删除吗?" })

@*//分页*@

共 @Model.TotalPageCount 页 @Model.TotalItemCount 条记录，当前为第 @Model.CurrentPageIndex 页
@Ajax.Pager(Model, new PagerOptions
{
/*
* 设置分页显示的样式
*/
ActionName = "Show",
FirstPageText = "首页",
LastPageText = "最后一页",
NextPageText = "下一页",
PrevPageText = "上一页",
PageIndexParameterName = "index",
ContainerTagName = "ul",
CssClass = "pagination",
CurrentPagerItemTemplate = "

{0}

",
DisabledPagerItemTemplate = "

{0}

",
PagerItemTemplate = "

{0}

"
},
new MvcAjaxOptions
{
HttpMethod = "post",
UpdateTargetId = "divData",//更新数据的标签ID
DataFormId = "form0" //分页对应的条件搜索表单ID
})

第一次发技术文章,还望大家多多指教,逻辑有点不清晰,有什么不懂得可以问我,觉得我写的还可以的话,点点赞,关注一下,小学生在此先谢过了