ZK数据库CURD--Todo
1.建立mysql数据库和表：
create database zktodo character set=utf8; create table event( id varchar(55), name varchar(55), priority int, date date );
2.新建Dynamic web project，添加ZK supports，建立完成之后添加mysql jdbc jar包到项目build path
3.建立entity和dao
package com.zktodo.dao; import java.util.Date; public class MyEvent { private String id; private String name; private int priority; private Date date; public MyEvent(){} public MyEvent(String id,String name,int priority,Date date){ this.id = id; this.name = name; this.priority = priority; this.date = date; } public Date getDate() { return date; } public void setDate(Date date) { this.date = date; } public int getPriority() { return priority; } public void setPriority(int priority) { this.priority = priority; } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
package com.zktodo.dao; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.List; import java.util.UUID; public class EventDAO { private String url = "jdbc:mysql://localhost:3306/zktodo"; private String user = "root"; private String pwd = "root"; public EventDAO() { try { Class.forName("com.mysql.jdbc.Driver"); } catch (ClassNotFoundException e) { e.printStackTrace(); } } public List findAll(){ Statement stmt = null; Connection conn = null; List allEvents = new ArrayList(); try { // get connection conn = DriverManager.getConnection(url, user, pwd); stmt = conn.createStatement(); ResultSet rs = stmt.executeQuery("select * from event"); // fetch all events from database MyEvent evt; while (rs.next()) { evt = new MyEvent(); evt.setId(rs.getString(1)); evt.setName(rs.getString(2)); evt.setPriority(rs.getInt(3)); evt.setDate(rs.getDate(4)); allEvents.add(evt); } } catch (SQLException e) { e.printStackTrace(); }finally{ try { stmt.close(); } catch (SQLException e) { e.printStackTrace(); } try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } return allEvents; } public boolean delete(MyEvent evt){ Connection conn = null; Statement stmt = null; boolean result = false; try { // get connection conn = DriverManager.getConnection(url, user, pwd); stmt = conn.createStatement(); if (stmt.executeUpdate("delete from event where id = '" + evt.getId() + "'") > 0); result = true; } catch (SQLException e) { e.printStackTrace(); }finally { try { stmt.close(); } catch (SQLException e) { e.printStackTrace(); } try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } return result; } public boolean insert(MyEvent evt){ Connection conn = null; Statement stmt = null; boolean result = false; try { // get connection conn = DriverManager.getConnection(url, user, pwd); stmt = conn.createStatement(); if (stmt.executeUpdate("insert into event(id,name,priority,date) " + "values ('" + UUID.randomUUID().toString() + "','" + evt.getName() + "'," + evt.getPriority() + ",'" + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
.format(evt.getDate()) + "')") > 0); result = true; } catch (SQLException e) { e.printStackTrace(); }finally{ try { stmt.close(); } catch (SQLException e) { e.printStackTrace(); } try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } return result; } public boolean update(MyEvent evt){ Connection conn = null; Statement stmt = null; boolean result = false; try { // get connection conn = DriverManager.getConnection(url, user, pwd); stmt = conn.createStatement(); if (stmt.executeUpdate("update event set name = '" + evt.getName() + "', priority = " + evt.getPriority() + ", date = '" + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(evt.getDate())+ "' where id = '" + evt.getId() + "'") > 0); result = true; } catch (SQLException e) { e.printStackTrace(); }finally{ try { stmt.close(); } catch (SQLException e) { e.printStackTrace(); } try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } return result; } }
4.新建index.zul文档
<?page title="zk todo index" contentType="text/html;charset=UTF-8"?> <zk> <window title="To do list" width="640px" border="normal"> <zscript> import com.zktodo.dao.EventDAO; import java.util.ArrayList; import java.text.SimpleDateFormat; import java.util.UUID; import com.zktodo.dao.MyEvent; EventDAO evtdao = new EventDAO(); List allEvents = evtdao.findAll(); void add(){ //insert into database MyEvent newEvt = new MyEvent(UUID.randomUUID().toString(), name.value,priority.value.intValue(),date.value); evtdao.insert(newEvt); //synchronized data with database allEvents = evtdao.findAll(); //insert a listEvent into the listbox Listitem li = new Listitem(); li.setValue(newEvt); li.appendChild(new Listcell(name.value)); li.appendChild(new Listcell(priority.value.toString())); li.appendChild(new Listcell(new SimpleDateFormat("yyyy-MM-dd").format(date.value))); box.appendChild(li); } void update(){ //update database MyEvent editEvt = (MyEvent)box.selectedItem.value; editEvt.setName(name.value); editEvt.setPriority(priority.value); editEvt.setDate(date.value); evtdao.update(editEvt); //update listbox List children = box.selectedItem.children; ((Listcell)children.get(0)).label = name.value; ((Listcell)children.get(1)).label = priority.value.toString(); ((Listcell)children.get(2)).label = new SimpleDateFormat("yyyy-MM-dd").format(date.value); } void delete(){ evtdao.delete((MyEvent)box.selectedItem.value); box.removeItemAt(box.getSelectedIndex()); cleargb(); } void move(){ name.value = ((MyEvent)box.selectedItem.value).getName(); priority.value = ((MyEvent)box.selectedItem.value).getPriority(); date.value = ((MyEvent)box.selectedItem.value).getDate(); } void cleargb(){ name.value = null; priority.value = null; date.value = null; } </zscript> <listbox id="box" multiple="true" rows="4" onSelect="move()"> <listhead> <listheader label="Item" /> <listheader label="Priority" width="50px" /> <listheader label="Opened" width="90px" /> </listhead> <listitem forEach="${allEvents }" value="${ each }"> <listcell label="${each.name }"/> <listcell label="${each.priority }"/> <listcell label="${each.date }"/> </listitem> </listbox> <groupbox> <caption label="Event" /> Item: <textbox id="name" cols="50" /> Priority: <intbox id="priority" cols="1" /> Date: <datebox id="date" cols="8"/> <button label="Add" width="36px" height="24px" onClick="add()" /> <button label="Update" width="46px" height="24px" onClick="update()"/> <button label="Delete" width="46px" height="24px" onClick="delete()"/> </groupbox> </window> </zk>
5.运行结果：
初步还行，缺点如下：
1.没有分页，数目多了，只有下拉条
2.缺乏输入合法性判断（包括输入空值）
3.没有唯一性判断
4.缺乏选中多个删除和全部删除
优点：
1.界面好看
2.一个文件搞定CURD
3.中文化很顺利
6.要点
（1）zscript代码
<zscript>
import com.zktodo.dao.EventDAO;
import java.util.ArrayList;
import java.text.SimpleDateFormat;
import java.util.UUID;
import com.zktodo.dao.MyEvent;
EventDAO evtdao = new EventDAO();
List allEvents = evtdao.findAll();
void add(){
//insert into database
MyEvent newEvt = new MyEvent(UUID.randomUUID().toString(),
name.value,priority.value.intValue(),date.value);
evtdao.insert(newEvt);
//synchronized data with database
allEvents = evtdao.findAll();
//insert a listEvent into the listbox
Listitem li = new Listitem();
li.setValue(newEvt);
li.appendChild(new Listcell(name.value));
li.appendChild(new Listcell(priority.value.toString()));
li.appendChild(new Listcell(new SimpleDateFormat("yyyy-MM-dd").format(date.value)));
box.appendChild(li);
}
void update(){
//update database
MyEvent editEvt = (MyEvent)box.selectedItem.value;
editEvt.setName(name.value);
editEvt.setPriority(priority.value);
editEvt.setDate(date.value);
evtdao.update(editEvt);
//update listbox
List children = box.selectedItem.children;
((Listcell)children.get(0)).label = name.value;
((Listcell)children.get(1)).label = priority.value.toString();
((Listcell)children.get(2)).label = new SimpleDateFormat("yyyy-MM-dd").format(date.value);
}
void delete(){
evtdao.delete((MyEvent)box.selectedItem.value);
box.removeItemAt(box.getSelectedIndex());
cleargb();
}
void move(){
name.value = ((MyEvent)box.selectedItem.value).getName();
priority.value = ((MyEvent)box.selectedItem.value).getPriority();
date.value = ((MyEvent)box.selectedItem.value).getDate();
}
void cleargb(){
name.value = null;
priority.value = null;
date.value = null;
}
</zscript>
（2）forEach循环显示
<listitem forEach="${allEvents }" value="${ each }"> <listcell label="${each.name }"/> <listcell label="${each.priority }"/> <listcell label="${each.date }"/> </listitem>
（3）注册事件：
<listbox id="box" multiple="true" rows="4" onSelect="move()"> ..... <button label="Add" width="36px" height="24px" onClick="add()" /> <button label="Update" width="46px" height="24px" onClick="update()"/> <button label="Delete" width="46px" height="24px" onClick="delete()"/>