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在网上看到有很多人写extjs下的表格控件的增删改查,但是大多数都是直接从后台读取数据,很少有跟数据库进行交互的模式。 今天就来写一个这样的例子。欢迎大家交流指正。
首先简单介绍一下MVC模式,MVC全名是Model View Controller,是模型(model)-视图(view)-控制器(controller)的缩写。 Model(模型)
是应用程序中用于处理应用程序数据逻辑的部分。
通常模型对象负责在数据库中存取数据。 View(视图)
是应用程序中处理数据显示的部分。
通常视图是依据模型数据创建的。 Controller(控制器)
是应用程序中处理用户交互的部分。
通常控制器负责从视图读取数据,控制用户输入,并向模型发送数据。 下面就为大家说明代码示例:
视图部分:
前台JS部分代码:
Ext.onReady(function () { var csm = new Ext.grid.CheckboxSelectionModel({//创建checkbox对象 handleMouseDown: new Ext.emptyFn() }); var cum = new Ext.grid.ColumnModel([ csm, //checkbox对象 {header: "用户ID", dataIndex: "id", sortable: true }, { header: '用户姓名', dataIndex: 'name', sortable: true, editor: new Ext.grid.GridEditor( new Ext.form.TextField({ allowBlank: false })) }, { header: '性别', dataIndex: 'sex', sortable: true, editor: new Ext.grid.GridEditor( new Ext.form.TextField({ allowBlank: false })) } ]); ; var store = new Ext.data.Store({ proxy: new Ext.data.HttpProxy({ url: 'UserData.aspx' }), reader: new Ext.data.JsonReader({ totalProperty: 'totalCount', //json字符串中的字段,数据量大小 root: 'data'//json字符串中的字段 }, [ { name: 'id' }, { name: 'name' }, { name: 'sex' } ]), remoteSort: true }); var Record = Ext.data.Record.create([ { name: 'id', type: 'string' }, { name: 'name', type: 'string' }, { name: 'sex', type: 'string' } ]); store.load({ params: { start: 0, limit: 5} }); //运行加载表格数据 var cumgrid = new Ext.grid.EditorGridPanel({ renderTo: 'cumGrid', store: store, stripeRows: true, //斑马线效果 viewConfig: { forceFit: true, columnsText: "显示的列", sortAscText: "升序", sortDescText: "降序" }, height: 200, width: 550, sm: csm, bbar: new Ext.PagingToolbar({ pageSize: 5, //每页信息条数 store: store, autowidth: true, autoHeight: true, displayInfo: true, prevText: "上一页", nextText: "下一页", refreshText: "刷新", lastText: "最后页", firstText: "第一页", beforePageText: "当前页", afterPageText: "共{0}页", displayMsg: '显示第{0}条到第{1}条记录,一共{2}条', emptyMsg: '没有记录' }), tbar: new Ext.Toolbar(['-', { text: '添加一行', handler: function () { var win = new Ext.Window({ title: '添加用户', layout: 'fit', height: 300, width: 300, border: 0, frame: true, //去除窗体的panel框架 plain: true, html: '<iframe frameborder=0 width="100%" height="100%" allowtransparency="true" scrolling=auto src="addUser.htm"></iframe>' }); win.show(); //显示窗口 } }, '-', { text: '删除一行', handler: function () { Ext.Msg.confirm('信息', '确定要删除?', function (btn) { if (btn = 'yes') { var id = ""; function getid() { for (var i = 0; i < cumgrid.getSelectionModel().getSelections().length; i++) { id += cumgrid.getSelectionModel().getSelections()[i].get("id"); id += ','; } }; getid(); //初始化选中行id字符串数组 Ext.Ajax.request({ url: "DelUserInfo.aspx", method: "post", params: { id: id }, success: function (response) { Ext.Msg.alert("恭喜", "删除成功了!"); store.reload(); }, failure: function () { Ext.Msg.alert("提 示", "删除失败了!"); } }) } }); } }, '-', { text: '保存', handler: function () { var m = store.getModifiedRecords().slice(0); var jsonArray = []; Ext.each(m, function (item) { jsonArray.push(item.data); }) if (false) {//判断条件 return; } else { // alert(Ext.encode(jsonArray)) Ext.Ajax.request({ //url: "Demo/Operator.aspx", url: "SaveUserInfo.aspx", method: "POST", params: 'data=' + encodeURIComponent(Ext.encode(jsonArray)), success: function (response, option) { store.reload(); alert(response.responseText); }, failure: function (response) { store.reload(); alert(response.responseText) Ext.Msg.alert("提示", "修改失败了!"); } }); } } }, '-']), cm: cum }); cumgrid.render(); //刷新表格 });
表格界面如上图所示。增删改查分别通过,添加,删除,保存修改,和后台读取数据并分页实现。 业务处理部分:
UserBll.cs:
public class UserBLL { public UserBLL() { // //TODO: 在此处添加构造函数逻辑 // } UserDao dao = new UserDao(); JsonHelper json = new JsonHelper(); DataTable dt = new DataTable(); //获取全部数据 public string GetUserInfo() { dt = dao.GetAllInfo();//从数据库中读取数据 json.success = true; foreach (DataRow dr in dt.Rows) //将读取出的数据转换成字符串 { json.AddItem("id", dr["id"].ToString()); json.AddItem("name", dr["name"].ToString()); json.AddItem("sex", dr["sex"].ToString()); json.ItemOk(); } string jsons = json.ToString(); return jsons; } //根据id获取用户数据 public UserBean getUserInfosNoState(int id) { return dao.getUserInfosNoState(id); } //分页获取数据 public string GetUserInfoPage(int start, int limit) { JSONHelper json = new JSONHelper(); dt = dao.GetUserInfoPaging(start, limit); //从数据库中读取数据 json.success = true; foreach (DataRow dr in dt.Rows) //将读取出的数据转换成字符串 { json.AddItem("id", dr["id"].ToString()); json.AddItem("name", dr["name"].ToString()); json.AddItem("sex", dr["sex"].ToString()); json.ItemOk(); } json.totlalCount = dao.GetAllUserCount(); string jsons = ""; if (json.totlalCount > 0) { jsons = json.ToString(); } else { jsons = @"{success:false}"; } return jsons; } //删除用户信息 public int DelUserInfos(int id) { return dao.DelUserInfos(id); } //更新用户信息 public int SaveUserInfo(UserBean user) { return dao.SaveUserInfo(user); } //添加用户信息 public int AddUserInfo(UserBean user) { return dao.AddUserInfo(user); } }
后台查询数据部分:
UserData.aspx.cs:
public string ds = string.Empty; public UserBLL ub = new UserBLL(); protected void Page_Load(object sender, EventArgs e) { string starts = Request.Form["start"];//获取读取数据的范围 string limits = Request.Form["limit"]; int index = Convert.ToInt32(starts); int length = Convert.ToInt32(limits); ds = ub.GetUserInfoPage(index, length); }
增加数据: AddUserInfo.aspx.cs: UserBLL ub = new UserBLL(); protected void Page_Load(object sender, EventArgs e) { AddUserInfos(); } public void AddUserInfos() //添加数据 { //获取姓名性别 string name = Request.Form["name"]; string sex = Request.Form["sex"]; UserBean user = new UserBean(); user.Name = name; user.Sex = sex; int count = ub.AddUserInfo(user); if (count > 0) Response.Write(@"{success:true}"); else Response.Write(@"{success:false}"); }
删除数据部分: DelUserInfo.aspx.cs: 需要注意因为从前台传来的是所有改变行所有数据id的json字符串,需要进行字符串分割获取到要删除行的id UserBLL ub = new UserBLL(); protected void Page_Load(object sender, EventArgs e) { DeleteRoomInfo(); } public void DeleteRoomInfo() { string id = Request.Form["id"];//获取要删除用户的id字符串 if (id != null) { string[] ids = id.Split(',');//将每一名用户的id分割存入字符串数组 try { foreach (string r in ids) { ub.DelUserInfos(Convert.ToInt32(r));//循环删除用户信息 } Response.Write(@"{success:true}"); } catch (Exception) { Response.Write(@"{success:false}"); } } else { Response.Write(@"{success:false}"); } }
修改数据部分: SaveUserInfo.aspx.cs: 此处需要注意,因为前台传来的是所有改变行所有数据的json字符串,需要进行分割处理,先去掉多余的字符,在根据','分割成“数据名:数据值的形式”,再循环根据:进行分割 UserBLL ub = new UserBLL(); protected void Page_Load(object sender, EventArgs e) { SaveRoomInfo(); } public void SaveRoomInfo() { int count=0; string data = Request.Form["data"];// 对传值过来的json字符串进行处理,分解成键值对 data = RemoveChars(data,"["); data = RemoveChars(data, "]"); data = RemoveChars(data,"\""); data = RemoveChars(data, "}"); data = RemoveChars(data, "{"); string[] field = data.Split(','); string[] keyvalue; for (int i = 0; i < field.Length / 3; i++) { UserBean user = new UserBean(); for (int j = i * 3, k = 0; k < 3; j++, k++) { keyvalue = field[j].Split(':');//将json字符串中的数据项名和数据项值分开,分别存入user对象中 if (keyvalue[0] == "id") { user.Id = Convert.ToInt32(keyvalue[1]); } else if (keyvalue[0] == "name") { user.Name = keyvalue[1]; } else if (keyvalue[0] == "sex") { user.Sex = keyvalue[1]; } } count = ub.SaveUserInfo(user); } if (count > 0) { Response.Write("{success:'true'},{data:" + field[2] + "}"); } else { Response.Write("{success:'false'},{data:" + field[2] + "}"); } } //删除字符串中某个字符 static string RemoveChars(string str, string remove) { if (string.IsNullOrEmpty(str) || string.IsNullOrEmpty(remove)) { throw new ArgumentException("...."); } StringBuilder result = new StringBuilder(str.Length); Dictionary<char, bool> dictionary = new Dictionary<char, bool>(); foreach (char ch in remove) { dictionary[ch] = true; } foreach (char ch in str) { if (!dictionary.ContainsKey(ch)) { result.Append(ch); } } return result.ToString(); }
模型部分: UserBean.cs: public class UserDao { public UserDao() { // //TODO: 在此处添加构造函数逻辑 // } private DataTable dt; public DataTable GetAllInfo() { try { return SqlHelper.ExecuteDataTable("select * from T_user"); } catch(Exception){throw;} } //分页读取数据 public DataTable GetUserInfoPaging(int start, int limit) { try { return SqlHelper.ExecuteDataTable("select top " + limit + " * from T_user where id not in(select top " + start + " id from T_user order by id asc) order by id asc"); } catch (Exception) { throw; } } public UserBean getUserInfosNoState(int id) { try { dt = SqlHelper.ExecuteDataTable("select * from T_user where id=" + id); UserBean user = new UserBean(); user.Id = int.Parse(dt.Rows[0]["id"].ToString()); user.Name = dt.Rows[0]["name"].ToString(); user.Sex = dt.Rows[0]["sex"].ToString(); return user; } catch (Exception){ throw; } } //获得用户总数 public int GetAllUserCount() { try { return (int)SqlHelper.ExecuteScalar("select count(*) from T_user"); } catch (Exception) { throw; } } //删除用户信息 public int DelUserInfos(int id) { try { int count = SqlHelper.ExecuteNonQuery("delete T_user where id=" + id); return count; } catch (Exception){ throw; } } //保存修改 public int SaveUserInfo(UserBean user) { try { int count = SqlHelper.ExecuteNonQuery("update T_user set name='" + user.Name + "',sex='" + user.Sex + "' where id=" + user.Id); return count; } catch (Exception){ throw;} } //新增用户 public int AddUserInfo(UserBean user) { try { int count = SqlHelper.ExecuteNonQuery("insert into T_user values('" + user.Name + "','" + user.Sex + "')"); return count; } catch (Exception) { throw; } } }
UserBean.cs public class UserBean { public UserBean() { // //TODO: 在此处添加构造函数逻辑 // } private long id; private string sex; private string name; public long Id { get { return id; } set { id = value; } } public string Name { get { return name; } set { name = value; } } public string Sex { get { return sex; } set { sex = value; } } } |
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