封装jQuery表格插件jqGrid,控件化jqGrid(三):查询,编辑,修改,删除
上两篇:
封装jQuery表格插件jqGrid,控件化jqGrid(一):显示
封装jQuery表格插件jqGrid,控件化jqGrid(二):显示
本文将编码表格的动作功能,查询,编辑,修改和删除,并在文末附上源码,供大家参考,一起讨论,希望可以抛砖引玉!
一,在jqGrid.cs控件主体类中加入属性,用于控制这些功能的开关
#region 动作按钮 private bool _search = false; private bool _add = false; private bool _edit = false; private bool _del = false; [Description("是否可查询,默认否")] public bool Search { get { return _search; } set { _search = value; } } [Description("是否可添加,默认否")] public bool Add { get { return _add; } set { _add = value; } } [Description("是否可编辑,默认否")] public bool Edit { get { return _edit; } set { _edit = value; } } [Description("是否可删除,默认否")] public bool Del { get { return _del; } set { _del = value; } } #endregion
相应的,需要在构造jqGrid页面JS时,构造相应的JS脚本,代码大家自己下源码可以看到。
二,做完了控件类,现在开始数据提供类的编码,这也是最核心的。
1)查询
可以用firebug看到jqGrid查询时,使用的是get方式,所以用Request.QueryString的方式取得控件传过来的值
看到传来的的_search参数控件查询的开关,当值为true时,查询打开
本控件仅使用复合查询的方式,并且默认使用“包含”,“大于等于”和“小于等于”,前者符合大部分的通用查询的要求,后者使得查询处理更简单些
其形式如:{"groupOp":"AND","rules":[{"field":"email","op":"cn","data":"1"},{"field":"orderno","op":"ge","data":"2"}]}
使用复合查询时,传过来的查询值是以json的方式包含在filters参数中的,因此,要使用其值,需要对其值进行JSON的反序列化,这里使用DataContractJsonSerializer,需要在类中using System.Runtime.Serialization.Json,工程中也要加入其引用,其核心代码如下:
//反序列化json string conditions = HttpUtility.UrlDecode(context.Request.QueryString["filters"].ToString()); var mStream = new MemoryStream(Encoding.UTF8.GetBytes(conditions)); //解决中文乱码问题 //var mStream = new MemoryStream(Encoding.Unicode.GetBytes(conditions)); DataContractJsonSerializer dcjson = new DataContractJsonSerializer(typeof(jqGridFilter)); jqGridFilter filters = (jqGridFilter)dcjson.ReadObject(mStream); //jqGridFilter filters = (jqGridFilter)dcjson.ReadObject(mStream);
另外,还需要新建一个类,用于对应反序列化
[DataContract] class jqGridFilter { // {"groupOp":"AND","rules":[{"field":"email","op":"cn","data":"1"},{"field":"orderno","op":"ge","data":"2"}]} private string groupOp = "AND"; private List<jqGridFilterRules> jqGridFilterRulesList; [DataMember(Name="groupOp")] public string GroupOp { get { return groupOp; } set { groupOp = value; } } [DataMember(Name = "rules")] public List<jqGridFilterRules> JqGridFilterRulesList { get { return jqGridFilterRulesList; } set { jqGridFilterRulesList = value; } } } [DataContract] class jqGridFilterRules { private string field; private string op; private string data; [DataMember(Name = "field")] public string Field { get { return field; } set { field = value; } } [DataMember(Name = "op")] public string Op { get { return op; } set { op = value; } } [DataMember(Name = "data")] public string Data { get { return data; } set { data = value; } } }
注意类名上的DataContract声明和参数中的形如[DataMember(Name="groupOp")]的声明,这是反序列化所必须的,具体的大家可以搜索一下,这里就不做详细说明了
以上就完成了查询条件方面的参数分析和清理,现在对这些东东进行数据库交互
if (filters.GroupOp == "AND") { foreach(jqGridFilterRules rules in filters.JqGridFilterRulesList) { switch (rules.Op) { case "cn": searchCase += " and " + rules.Field + " like '%" + rules.Data + "%'"; break; case "ge": searchCase += " and " + rules.Field + ">='" + rules.Data + "'"; break; case "le": searchCase += " and " + rules.Field + "<='" + rules.Data + "'"; break; default: break; } } } else { searchCase += " and (1<>1"; foreach (jqGridFilterRules rules in filters.JqGridFilterRulesList) { switch (rules.Op) { case "cn": searchCase += " or " + rules.Field + " like '%" + rules.Data + "%'"; break; case "ge": searchCase += " or " + rules.Field + ">='" + rules.Data + "'"; break; case "le": searchCase += " or " + rules.Field + "<='" + rules.Data + "'"; break; default: break; } } searchCase += ")"; }
注意到or条件时,searchCase += " and (1<>1"这样的形式,这个小技巧,大家可以在sql中自己试试看,这样可以解决拼接SQL条件时or开头的问题,在第一篇中还有1=1的形式,同样的,也是可以解决and开头的问题。这个是我师傅教的,自认为是一个很牛比的小技巧。
查询至些就OVER了。
2)编辑,删除,添加
在设计控件之初,就为这个编辑伤脑筋,每个表的字段都不一样,类型也不一样,用反射吗,不灵活,也好麻烦,不能控件到细部
用entity framework吧,这个好,自动取到post过来的值,自动更新model,不过要依赖entity,更不通用。
后来想到配置用XML,问题一通百通,不管是表体的呈现灵活还是数据提供类的方面,都可以解决掉。
此三个功能都是使用post方式传递各项值,了解这点以后就很方便了,直接拼接SQL就可以完成这三个功能,很简单
#region 添?加ó,?修T改?,?删?除y case "edit": string tableName = context.Request.QueryString["tablename"].ToString(); string idKey = string.Empty; string oper = context.Request.Form["oper"].ToString(); string xmlPath = System.AppDomain.CurrentDomain.BaseDirectory + tableName + ".xml"; StringBuilder sb; XmlDocument xmlDoc = new XmlDocument(); XmlNodeList xnList = xmlDoc.SelectNodes("root//columns"); xmlDoc.Load(xmlPath); foreach (XmlNode xn in xnList) { if (xn.Attributes["IsIdentity"] != null) { idKey = xn.Attributes["name"].Value; } } switch (oper) { case "edit": sb = new StringBuilder(); sb.Append("update " + tableName + " set "); foreach (XmlNode xn in xnList) { if (xn.Attributes["IsIdentity"] == null || xn.Attributes["IsIdentity"].Value == "False") { if (context.Request.Form[xn.Attributes["name"].Value].ToString() != string.Empty) { if (xn.Attributes["sorttype"].Value == "int" || xn.Attributes["sorttype"].Value == "float") { sb.Append(xn.Attributes["name"].Value + "=" + HttpUtility.UrlDecode(context.Request.Form[xn.Attributes["name"].Value].ToString()) + ","); } else { sb.Append(xn.Attributes["name"].Value + "='" + HttpUtility.UrlDecode(context.Request.Form[xn.Attributes["name"].Value].ToString()) + "',"); } } } } sb.Remove(sb.Length - 1, 1); sb.Append(" where id=" + context.Request.Form[idKey].ToString()); SqlHelper.ExecuteNonQuery(sb.ToString()); break; case "add": sb = new StringBuilder(); StringBuilder fieldstr = new StringBuilder(); StringBuilder valuestr = new StringBuilder(); foreach (XmlNode xn in xnList) { if (xn.Attributes["IsIdentity"] == null || xn.Attributes["IsIdentity"].Value == "False") { if (context.Request.Form[xn.Attributes["name"].Value].ToString() != string.Empty) { fieldstr.Append(xn.Attributes["name"].Value + ","); if (xn.Attributes["sorttype"].Value == "int" || xn.Attributes["sorttype"].Value == "float") { valuestr.Append(HttpUtility.UrlDecode(context.Request.Form[xn.Attributes["name"].Value].ToString()) + ","); } else { valuestr.Append("'" + HttpUtility.UrlDecode(context.Request.Form[xn.Attributes["name"].Value].ToString()) + "',"); } } } } fieldstr.Remove(fieldstr.Length - 1, 1); valuestr.Remove(valuestr.Length - 1, 1); sb.Append("insert into " + tableName + " ("); sb.Append(fieldstr.ToString()); sb.Append(") values ("); sb.Append(valuestr.ToString()); sb.Append(")"); SqlHelper.ExecuteNonQuery(sb.ToString()); break; case "del": string sql="delete from "+tableName+" where id="+context.Request.Form[idKey].ToString(); SqlHelper.ExecuteNonQuery(sql); break; default: break; } #endregion
文章有点长了,本来再慢慢写的,不过这几天很忙,一次写完吧,还是那句话,希望可以抛砖引玉。
这里是源码下载:https://files.cnblogs.com/bestfc/AspJqGrid.rar
使用方法:
web.config中加入
<pages> <controls> <add tagPrefix="AllenJqGrid" assembly="AspJqGrid" namespace="AspJqGrid" /> </controls> </pages> <httpHandlers> <add path="data.ashx" verb="*" type="AspJqGrid.AjaxData,AspJqGrid"/> </httpHandlers>
页面中加入jquery.js和jquery.ui.css后,写入
<AllenJqGrid:JqGrid ID="MyJqGrid" runat="server" TableName="orders" Search="true" Scroll="true" Add="true" Edit="true" Del="true" />,就OK了。
配置文件自动生成在页面文件所在目录,生成会判断是否有配置文件,有则读,无则生成后再读。