Easyui数据表格-地区列表及工具栏增删改

  1 <%@ page language="java" contentType="text/html; charset=UTF-8"
  2     pageEncoding="UTF-8"%>
  3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
  4 <html>
  5 <head>
  6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  7 <title>数据表格</title>
  8 <%
  9  String pid = request.getParameter("pid");
 10 if(pid == null || pid.trim().length() == 0 )
 11 {
 12     pid = "0";
 13 }
 14 
 15 %>
 16 <script type="text/javascript" src="js/jquery-easyui-1.4.4/jquery.min.js"></script>
 17 <link rel="stylesheet" type="text/css" href="js/jquery-easyui-1.4.4/themes/icon.css">
 18 <link rel="stylesheet" type="text/css" href="js/jquery-easyui-1.4.4/themes/default/easyui.css">
 19 <script type="text/javascript" src="js/jquery-easyui-1.4.4/jquery.easyui.min.js"></script>
 20 <script type="text/javascript" src="js/jquery-easyui-1.4.4/locale/easyui-lang-zh_CN.js"></script>
 21     
 22 <script type="text/javascript">    
 23     $(function(){
 24         $('#mydg').datagrid({
 25             title:'地区列表',
 26             //singleSelect:true,
 27             600,
 28             height:300,
 29             fitColumns:true,
 30             striped:true,
 31             idField:'id',//设置后可实现跨页选择
 32             pagination:true,//分页工具栏
 33             rownumbers:true,
 34             pageSize:5,
 35             pageList:[5,10,15],
 36             sortName:'id',
 37             remoteSort:false,//定义从服务器对数据进行排序。
 38             sortOrder:'desc',
 39             url:'MembersList?pid=<%=pid%>',
 40             toolbar: [{
 41                 iconCls: 'icon-add',
 42                 text:'增加地区',
 43                 handler: function(){
 44                     $("#addform").form('reset');
 45                     //清理id
 46                     $("#id").val("");
 47                     
 48                     $('#add').dialog({
 49                         title:'增加地区'
 50                     });
 51                     $('#add').dialog('open');
 52                     
 53                 }
 54             },'-',{
 55                 iconCls: 'icon-edit',
 56                 text:'编辑地区',
 57                 handler: function(){
 58                     var s = $("#mydg").datagrid('getSelected');
 59                     if(s == null)
 60                         {
 61                         alert('请选择一条数据');
 62                         }
 63                     else
 64                         {
 65                         alert(s);
 66                         //编辑数据
 67                         $("#addform").form('reset');
 68                         $('#add').dialog({
 69                             title:'编辑地区'
 70                         });
 71                         //绑定数据
 72                         $("#addform").form('load',s);
 73                         
 74                         $('#add').dialog('open');
 75                         
 76                         
 77                         }
 78                     //alert('编辑按钮')
 79                     }
 80             },'-',{
 81                 iconCls: 'icon-remove',
 82                 text:'删除地区',
 83                 handler: function(){
 84                     var s = $("#mydg").datagrid('getSelections');
 85                     if(s.length > 0)
 86                     {
 87                         $.messager.confirm('确认','您确认想要删除记录吗？',function(r){    
 88                             if (r){    
 89                                    
 90                             
 91                         var ids = "";
 92                         for(var i = 0; i < s.length; i ++)
 93                         {
 94                             ids += s[i].id;
 95                             if(i != s.length - 1)
 96                                 {
 97                                 ids += ",";
 98                                 }
 99                         }
100                     
101                         //alert('ids=' + ids);
102                         $.get("Deletedg?ids=" + ids,
103                                 function(data,status)
104                                 {
105                                 var data = eval('('+ data + ')');
106                                 $.messager.show({title:'信息', msg:data.message});
107                                 });
108                         
109                         $("#mydg").datagrid('reload');
110                         
111                         $("#mydg").datagrid('clearSelections');
112                         }
113                         });    
114                     }
115                     else
116                     { 
117                         alert('请选择数据');
118                     }
119                 }
120             }],
121 
122             frozenColumns:[[//冻结列
123                 {field:'',checkbox:true},
124                 {field:'id',80,title:'ID'}
125                             ]],
126             columns:[[
127                       {field:'parentid',80,title:'父ID'},
128                       {field:'name',80,title:'地区名',
129                           formatter: function(value,row,index)//列格式化
130                           {
131                              value = '<a href=datagrid.jsp?pid=' + row.id + '>' + value +'</a>' ;
132                              return value;
133                              
134                           }
135                       },
136                       {field:'postcode',80,title:'邮编'},
137                       
138                       ]]
139         });
140         //按钮
141         $('#bt').click(function(){
142             $("#addform").form('submit');
143             return false;
144             });
145         
146         //表单
147         $("#addform").form({
148             url:'AddMem',
149             onSubmit:function(){
150                 //alert('表单测试');
151                 var isValid = $(this).form('validate');
152                 if(!isValid)
153                 {
154                 $.messager.show({title:'信息',msg:'输入有误'});
155                 return false
156                 }
157             },
158             novalidate:false,
159             success:function(data){
160                 
161                 var data = eval('('+ data + ')');
162                 
163                 $.messager.show({title:'信息', msg:data.message});
164                 
165                 if(data.success == true)
166                     {
167                         
168                         $("#add").dialog('close');
169                         $("#mydg").datagrid('reload');
170                     }
171 
172                 //alert(data.message);
173             }
174         });
175     });
176 </script>
177 </head>
178 <body>
179 <!--
180     <table id="mydatagrid" class="easyui-datagrid" style="500px;height:300px;"
181      data-options="url:'',title:'地区列表',singleSelect:true,collapsible:true">
182     <thead>
183         <tr>
184             <th data-options="field:'id',100">id</th>
185             <th data-options="field:'parentid',100">父id</th>
186             <th data-options="field:'name',100">地区名</th>
187             <th data-options="field:'postcode',100">邮编</th>
188         </tr>
189     </thead>
190     </table>
191   -->    
192     <table id="mydg"></table>
193     
194     <div id="add" class="easyui-dialog" style="300px" data-options="title:'添加地区',closed:true">
195         <form id="addform" method="post">
196             <table>
197                 <tr>
198                     <td>地区名称:</td>
199                     <td><input name="name"  class="easyui-textbox"
200                  data-options="required:true,validType:'length[2,5]'"></td>
201                  </tr>
202                  <tr>
203                     <td>邮政编码:</td>
204                     <td><input name="postcode"  class="easyui-numberbox"
205                  data-options="required:false,validType:'length[6,6]'"></td>
206                  
207                  <input type="hidden" value="" name="parentid">
208                  <input type="hidden" value="" name="id" id="id">
209                  
210                 </tr>
211                 <tr>
212                     <td colspan="2" align="center"><a href="#" id="bt" style="100px" class="easyui-linkbutton">提交</a></td>
213                 </tr>
214             </table>
215         </form>
216     </div>
217 </body>
218 </html>

查询Servlet

 1 package com.hanqi;
 2 
 3 import java.io.IOException;
 4 import java.util.ArrayList;
 5 
 6 import javax.servlet.ServletException;
 7 import javax.servlet.annotation.WebServlet;
 8 import javax.servlet.http.HttpServlet;
 9 import javax.servlet.http.HttpServletRequest;
10 import javax.servlet.http.HttpServletResponse;
11 
12 import com.alibaba.fastjson.JSON;
13 
14 /**
15  * Servlet implementation class jsonMembers
16  */
17 @WebServlet("/jsonMembers")
18 public class jsonMembers extends HttpServlet {
19     private static final long serialVersionUID = 1L;
20        
21     /**
22      * @see HttpServlet#HttpServlet()
23      */
24     public jsonMembers() {
25         super();
26         // TODO Auto-generated constructor stub
27     }
28 
29     /**
30      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
31      */
32     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
33         // TODO Auto-generated method stub
34         //接收地区父id
35         String pid = request.getParameter("pid");
36         
37         //如果没有收到,赋初值-1
38         if(pid == null || pid.trim().length() == 0)
39         {
40             pid = "-1";
41         }
42 
43         try {
44     
45             //实例化集合,接收查询结果
46             ArrayList<Member> arr = new ArrayList<Member>();
47             
48             //实例化数据库操作类
49             AreaDao ad = new AreaDao();
50             
51             //调用查询方法
52             arr = ad.selArea(Integer.parseInt(pid));
53             
54             //初始化向前台输出的json字符串
55             String str = "";
56             
57             //如果查询到数据
58             if(arr != null)
59             {
60                 //转换成json
61                 str = JSON.toJSON(arr).toString();
62             }
63             
64             //str = JSON.toJSONString(arr);
65 
66             //输出json
67             response.getWriter().print(str);
68 
69             }catch (Exception e) {
70             
71             response.getWriter().append(e.getMessage());
72         }
73 
74 
75         //response.getWriter().append("Served at: ").append(request.getContextPath());
76     }
77 
78     /**
79      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
80      */
81     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
82         // TODO Auto-generated method stub
83         doGet(request, response);
84     }
85 
86 }

增加/修改的Servlet

  1 package com.hanqi;
  2 
  3 import java.io.IOException;
  4 import javax.servlet.ServletException;
  5 import javax.servlet.annotation.WebServlet;
  6 import javax.servlet.http.HttpServlet;
  7 import javax.servlet.http.HttpServletRequest;
  8 import javax.servlet.http.HttpServletResponse;
  9 
 10 /**
 11  * Servlet implementation class AddMem
 12  */
 13 @WebServlet("/AddMem")
 14 public class AddMem extends HttpServlet {
 15     private static final long serialVersionUID = 1L;
 16        
 17     /**
 18      * @see HttpServlet#HttpServlet()
 19      */
 20     public AddMem() {
 21         super();
 22         // TODO Auto-generated constructor stub
 23     }
 24 
 25     /**
 26      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 27      */
 28     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 29         
 30         //接收表单数据
 31         String name = request.getParameter("name");
 32         String postcode = request.getParameter("postcode");
 33         String parentid = request.getParameter("parentid");
 34         //id用来判断是添加还是修改
 35         String id = request.getParameter("id");
 36         
 37         //判断数据是否合法
 38         if(name == null || name.trim().length() == 0)
 39         {
 40             response.getWriter().append("{"success":false, "message":"名称不能为空"}");
 41         }
 42         else if(parentid == null || parentid.trim().length() == 0)
 43         {
 44             response.getWriter().append("{"success":false, "message":"父id不能为空"}");
 45         }
 46         else
 47         {
 48             //转换数据类型
 49             int pid = Integer.parseInt(parentid);
 50             
 51             //实例化实体类
 52             Member mem = new Member();
 53             
 54             //向实体类对象添加参数
 55             mem.setName(name);
 56             mem.setPostcode(postcode);
 57             mem.setParentid(pid);
 58             
 59             //实例化数据库操作类
 60             AreaDao ad = new AreaDao();
 61             
 62             try {
 63                 //影响行数
 64                 int row = -1;
 65                 
 66                 //如果收到id,说明是修改请求
 67                 if(id != null && id.trim().length() > 0)
 68                 {
 69                     int iid = Integer.parseInt(id);
 70                     //向实体类对象添加id参数
 71                     mem.setId(iid);
 72                     //调用修改方法
 73                     row = ad.updateArea(mem);
 74                     //输出成功信息
 75                     response.getWriter().append("{"success":true, "message":"成功修改"+row +"条数据"}");
 76                 }
 77                 else
 78                 {
 79                     //没有收到id,则添加数据
 80                     row = ad.addArea(mem);
 81                     //输出成功信息
 82                     response.getWriter().append("{"success":true, "message":"成功添加"+row +"条数据"}");
 83                 }    
 84                 
 85             } catch (Exception e) {
 86                 //异常处理,输出错误信息
 87                 response.getWriter().append("{"success":false, "message":"错误信息:"+ e.getMessage()+""}");
 88             }
 89         
 90         }
 91 
 92         //response.setHeader("refresh", "1;URL=memList.jsp?pid=" + parentid);
 93         //response.getWriter().append("Served at: ").append(request.getContextPath());
 94     }
 95 
 96     /**
 97      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 98      */
 99     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
100         // TODO Auto-generated method stub
101         doGet(request, response);
102     }
103 
104 }

删除的Servlet

  1 package com.hanqi;
  2 
  3 import java.io.IOException;
  4 import javax.servlet.ServletException;
  5 import javax.servlet.annotation.WebServlet;
  6 import javax.servlet.http.HttpServlet;
  7 import javax.servlet.http.HttpServletRequest;
  8 import javax.servlet.http.HttpServletResponse;
  9 
 10 /**
 11  * Servlet implementation class AddMem
 12  */
 13 @WebServlet("/AddMem")
 14 public class AddMem extends HttpServlet {
 15     private static final long serialVersionUID = 1L;
 16        
 17     /**
 18      * @see HttpServlet#HttpServlet()
 19      */
 20     public AddMem() {
 21         super();
 22         // TODO Auto-generated constructor stub
 23     }
 24 
 25     /**
 26      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 27      */
 28     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 29         
 30         //接收表单数据
 31         String name = request.getParameter("name");
 32         String postcode = request.getParameter("postcode");
 33         String parentid = request.getParameter("parentid");
 34         //id用来判断是添加还是修改
 35         String id = request.getParameter("id");
 36         
 37         //判断数据是否合法
 38         if(name == null || name.trim().length() == 0)
 39         {
 40             response.getWriter().append("{"success":false, "message":"名称不能为空"}");
 41         }
 42         else if(parentid == null || parentid.trim().length() == 0)
 43         {
 44             response.getWriter().append("{"success":false, "message":"父id不能为空"}");
 45         }
 46         else
 47         {
 48             //转换数据类型
 49             int pid = Integer.parseInt(parentid);
 50             
 51             //实例化实体类
 52             Member mem = new Member();
 53             
 54             //向实体类对象添加参数
 55             mem.setName(name);
 56             mem.setPostcode(postcode);
 57             mem.setParentid(pid);
 58             
 59             //实例化数据库操作类
 60             AreaDao ad = new AreaDao();
 61             
 62             try {
 63                 //影响行数
 64                 int row = -1;
 65                 
 66                 //如果收到id,说明是修改请求
 67                 if(id != null && id.trim().length() > 0)
 68                 {
 69                     int iid = Integer.parseInt(id);
 70                     //向实体类对象添加id参数
 71                     mem.setId(iid);
 72                     //调用修改方法
 73                     row = ad.updateArea(mem);
 74                     //输出成功信息
 75                     response.getWriter().append("{"success":true, "message":"成功修改"+row +"条数据"}");
 76                 }
 77                 else
 78                 {
 79                     //没有收到id,则添加数据
 80                     row = ad.addArea(mem);
 81                     //输出成功信息
 82                     response.getWriter().append("{"success":true, "message":"成功添加"+row +"条数据"}");
 83                 }    
 84                 
 85             } catch (Exception e) {
 86                 //异常处理,输出错误信息
 87                 response.getWriter().append("{"success":false, "message":"错误信息:"+ e.getMessage()+""}");
 88             }
 89         
 90         }
 91 
 92         //response.setHeader("refresh", "1;URL=memList.jsp?pid=" + parentid);
 93         //response.getWriter().append("Served at: ").append(request.getContextPath());
 94     }
 95 
 96     /**
 97      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 98      */
 99     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
100         // TODO Auto-generated method stub
101         doGet(request, response);
102     }
103 
104 }

数据库操作类

  1 package com.hanqi;
  2 
  3 import java.sql.*;
  4 import java.util.*;
  5 
  6 //数据操作类
  7 public class AreaDao {
  8     
  9     //增
 10     public int addArea(Member mem) throws Exception
 11     {
 12         int row = -1;
 13         Connection conn = DBHelper.getConnection();
 14         PreparedStatement ps = null;
 15         
 16         if(conn != null)
 17         {
 18             try
 19             {
 20                 String sql = "insert into MEMBERS(id, parentid, name, postcode) values(sq_members_id.nextval,?,?,?)";
 21                 
 22                 ps = conn.prepareStatement(sql);
 23                 
 24                 ps.setInt(1, mem.getParentid());
 25                 ps.setString(2, mem.getName());
 26                 ps.setString(3, mem.getPostcode());
 27                 
 28                 row = ps.executeUpdate();
 29             }
 30             catch(Exception e)
 31             {
 32                 throw e;
 33             }
 34             finally
 35             {
 36                 ps.close();
 37             }
 38             
 39         }
 40         conn.close();
 41         return row;
 42     }
 43     
 44     //修改
 45     public int updateArea(Member mem) throws Exception
 46     {
 47         int row = -1;
 48         Connection conn = DBHelper.getConnection();
 49         PreparedStatement ps = null;
 50         
 51         if(conn != null)
 52         {
 53             try
 54             {
 55                 String sql = "update MEMBERS set parentid=?, name=?, postcode=? where id = ?";
 56                 
 57                 ps = conn.prepareStatement(sql);
 58                 
 59                 ps.setInt(1, mem.getParentid());
 60                 ps.setString(2, mem.getName());
 61                 ps.setString(3, mem.getPostcode());
 62                 ps.setInt(4, mem.getId());
 63                 
 64                 row = ps.executeUpdate();
 65             }
 66             catch(Exception e)
 67             {
 68                 throw e;
 69             }
 70             finally
 71             {
 72                 ps.close();
 73             }
 74             
 75         }
 76         conn.close();
 77         return row;
 78     }
 79     
 80     //删除
 81     public int delArea(int id) throws Exception
 82     {
 83         int row = -1;
 84         Connection conn = DBHelper.getConnection();
 85         PreparedStatement ps = null;
 86         
 87         if(conn != null)
 88         {
 89             try
 90             {
 91                 String sql = "delete from MEMBERS where id = ? or parentid = ?";
 92                 
 93                 ps = conn.prepareStatement(sql);
 94                 
 95                 ps.setInt(1, id);
 96                 ps.setInt(2, id);
 97                 
 98                 row = ps.executeUpdate();
 99             }
100             catch(Exception e)
101             {
102                 throw e;
103             }
104             finally
105             {
106                 ps.close();
107             }
108             
109         }
110         conn.close();
111         return row;
112     }
113     
114     //递归方法
115     private int dg(Connection conn, int id, int row) throws Exception
116     {
117         
118         //遍历子节点
119         PreparedStatement ps = null;
120         
121         PreparedStatement ps1 = null;
122         
123         ResultSet rs =null;
124         
125         try{
126             
127             String sql = "delete from MEMBERS where id = ?";
128             
129             ps1 = conn.prepareStatement(sql);
130             
131             ps1.setInt(1, id);
132             
133             row = row + ps1.executeUpdate();
134                 
135                 sql = "select * from MEMBERS where parentid = ?";
136         
137                 ps = conn.prepareStatement(sql);
138                 
139                 ps.setInt(1, id);
140                 
141                 rs = ps.executeQuery();
142                 
143                 if(rs != null)
144                 {
145                     
146                     while(rs.next())
147                     {
148                         row = dg(conn, rs.getInt("id"),row);//递归调用
149                     }
150                 }
151                 
152             }
153         
154         catch(Exception e)
155         {
156             e.printStackTrace();
157         
158         }
159         finally
160         {
161             try
162             {
163             rs.close();
164             ps.close();
165             ps1.close();
166             
167             }
168             catch(Exception e)
169             {
170                 throw e;
171             }
172         }
173         return row;        
174     }
175     
176     //递归删除
177     public int delDG(int id) throws Exception
178     {
179         int row = 0;
180         
181         Connection conn = DBHelper.getConnection();
182         
183         if(conn != null)
184         {
185             try
186             {
187                 //设置手动提交
188                 conn.setAutoCommit(false);
189                 
190                 //递归级联删除
191                 
192                 row = dg(conn,id,row);
193                 
194                 conn.commit();
195             }
196             catch(Exception e)
197             {
198                 //事务回滚
199                 conn.rollback();
200                 throw e;
201             }
202             
203         }
204         
205         conn.close();
206         return row;
207     }
208 
209     //查询
210     public ArrayList<Member> selArea(int pid) throws Exception
211     {
212         ArrayList<Member> arr = null;
213     
214         Member mem = null;
215         
216         Connection conn = DBHelper.getConnection();
217         
218         PreparedStatement ps = null;
219         
220         ResultSet rs = null;
221         
222         if(conn != null  )
223         {
224             try
225             {
226                 
227                 
228                 String sql = "select * from MEMBERS where parentid = ?";
229                 
230                 ps = conn.prepareStatement(sql);
231                 
232                 ps.setInt(1, pid);
233                                 
234                 rs = ps.executeQuery();
235                 
236                 if(rs != null)
237                 {
238                     
239                     arr = new ArrayList<Member>();
240                     
241                     while(rs.next())
242                     {
243                         
244                         mem = new Member();
245                         
246                         mem.setId((rs.getInt("id")));
247                         mem.setParentid(rs.getInt("parentid"));
248                         mem.setName(rs.getString("name"));
249                         mem.setPostcode(rs.getString("postcode"));
250                         
251                         arr.add(mem);
252                     }        
253                 }
254     
255             }
256             catch(Exception e)
257             {
258                 throw e;
259             }
260             finally
261             {
262                 try
263                 {
264                     ps.close();
265                     rs.close();
266                     conn.close();
267                 }
268                 catch(Exception e)
269                 {
270                     conn.close();
271                 }
272                 
273             }
274         }
275         
276         return arr;
277     }
278 
279     //单条查询
280     public Member getList(int id) throws Exception
281     {
282         Member m = null;
283         
284         Connection conn = DBHelper.getConnection();
285         
286         PreparedStatement ps = null;
287         
288         ResultSet rs = null;
289             
290         
291         if(conn != null  )
292         {
293             try
294             {
295                 
296                 
297             String sql = "select * from members where id = ?";
298             
299             ps = conn.prepareStatement(sql);
300             
301             ps.setInt(1, id);
302             
303             rs = ps.executeQuery();
304             
305             if(rs != null && rs.next())
306             {
307                 m = new Member();
308                 
309                     m.setId(rs.getInt("id"));
310                     m.setParentid(rs.getInt("parentid"));
311                     m.setName(rs.getString("name"));
312                     m.setPostcode(rs.getString("postcode"));
313                     
314             }
315 
316             }
317             catch(Exception e)
318             {
319                 throw e;
320             }
321             finally
322             {
323                 try
324                 {
325                     ps.close();
326                     rs.close();
327                     conn.close();
328                 }
329                 catch(Exception e)
330                 {
331                     conn.close();
332                 }
333                 
334             }
335             
336         }
337         
338         return m;
339     }
340     
341     //分页查询
342     public ArrayList<Member> selArea(int pid,int page,int rows) throws Exception
343     {
344         ArrayList<Member> arr = null;
345     
346         Member mem = null;
347         
348         Connection conn = DBHelper.getConnection();
349         
350         PreparedStatement ps = null;
351         
352         ResultSet rs = null;
353         
354         if(conn != null  )
355         {
356             try
357             {
358                 int max = page * rows;
359                 int min = (page - 1) * rows;
360                 
361                 String sql = "select * from (select t.*,rownum rn from (select * from MEMBERS where parentid = ? order by id desc) t where rownum <= ?) where rn > ?";
362                 
363                 ps = conn.prepareStatement(sql);
364                 
365                 ps.setInt(1, pid);
366                 ps.setInt(2, max);
367                 ps.setInt(3, min);
368                                 
369                 rs = ps.executeQuery();
370                 
371                 if(rs != null)
372                 {
373                     
374                     arr = new ArrayList<Member>();
375                     
376                     while(rs.next())
377                     {
378                         
379                         mem = new Member();
380                         
381                         mem.setId((rs.getInt("id")));
382                         mem.setParentid(rs.getInt("parentid"));
383                         mem.setName(rs.getString("name"));
384                         mem.setPostcode(rs.getString("postcode"));
385                         
386                         arr.add(mem);
387                     }        
388                 }
389     
390             }
391             catch(Exception e)
392             {
393                 throw e;
394             }
395             finally
396             {
397                 try
398                 {
399                     ps.close();
400                     rs.close();
401                     conn.close();
402                 }
403                 catch(Exception e)
404                 {
405                     conn.close();
406                 }
407                 
408             }
409         }
410         
411         return arr;
412     }
413     
414     //记录条数查询
415     public  int getcount(int pid) throws Exception
416     {
417         int row = -1;
418     
419         Connection conn = DBHelper.getConnection();
420         
421         PreparedStatement ps = null;
422         
423         ResultSet rs = null;
424         
425         if(conn != null  )
426         {
427             try
428             {
429                 
430                 String sql = "select count(1) as rn from MEMBERS where parentid = ?";
431                 
432                 ps = conn.prepareStatement(sql);
433                 ps.setInt(1, pid);
434                 rs = ps.executeQuery();
435                 
436                 if(rs != null && rs.next())
437                 {
438                     row = rs.getInt("rn");
439                 }
440     
441             }
442             catch(Exception e)
443             {
444                 throw e;
445             }
446             finally
447             {
448                 try
449                 {
450                     ps.close();
451                     rs.close();
452                     conn.close();
453                 }
454                 catch(Exception e)
455                 {
456                     conn.close();
457                 }
458                 
459             }
460         }
461         
462         return row;
463     }
464 }
465

实体类

 1 package com.hanqi;
 2 
 3 //实体类
 4 public class Member {
 5     
 6     //成员变量设为私有
 7     private int id;
 8     private int parentid;
 9     private String name;
10     private String postcode;
11 
12     //对外开放getter和setter方法
13     public int getId() {
14         return id;
15     }
16 
17     public void setId(int id) {
18         this.id = id;
19     }
20 
21     public int getParentid() {
22         return parentid;
23     }
24 
25     public void setParentid(int parentid) {
26         this.parentid = parentid;
27     }
28 
29     public String getName() {
30         return name;
31     }
32 
33     public void setName(String name) {
34         this.name = name;
35     }
36 
37     public String getPostcode() {
38         return postcode;
39     }
40 
41     public void setPostcode(String postcode) {
42         this.postcode = postcode;
43     }
44 
45 
46     
47 }

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原文地址：https://www.cnblogs.com/dirgo/p/5116326.html