JDF bean模块想法交流-优快云博客

今天做了一个JDF的bean的简单实现，由于不利用配置文件存放信息，所以bean里面存放的内容还是蛮多的，下面就介绍下我的bean的设计。

首先申明了一个原始bean的接口

package com.db.beans; import java.util.HashMap; import java.util.List; public interface BeanInterface { //获取表名 public String getTable(); //逻辑删除设置 public void deleteLogic(); //保存 public void save(); //物理删除 public void deletePhysics(); //输出各个变量的值 public String toString(); //获取主键的ID public HashMap getPriKeyName(); //获取主键值 public HashMap getPriKeyValue(); //判断是否是从数据库读出填充的bean public boolean isGetBean(); //设置bean的状态，是否是从数据库中读取 public void isGetBean(boolean b); }

然后是一个AbstractBean，集成于这个接口，其实类似于数据容器。

package com.db.beans; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import org.apache.commons.lang.StringUtils; import net.chinacsharp.proxy.ConnectionProxy; public abstract class AbstractBean implements BeanInterface { public HashMap cMap = null; //bean 的每个字段，以及对应的值 public HashMap uMap = null;//修改列，以及值保存 public HashMap cName = null; //每个字段的ID public long flag = -1; //0 逻辑删除，-1 ，物理删除， 1 add 2 update public void init(HashMap map,HashMap umap,HashMap cName){ cMap = map; this.uMap = umap; this.cName = cName; } public AbstractBean(){ System.out.println("AbstractBean"); } public void deleteLogic() { // TODO Auto-generated method stub } public void save() { } public void deletePhysics() { // TODO Auto-generated method stub } public String toString(){ StringBuffer buffer = new StringBuffer(); for ( Iterator i = cMap.keySet().iterator(); i.hasNext();) { Object key = i.next(); Object value = cMap.get(key); buffer.append(key).append("=").append(value).append("\n"); } return buffer.toString(); } protected BeanInterface getBean(BeanInterface o,Object id_) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException{ List list = new ArrayList(); HashMap map = new HashMap(); java.lang.reflect.Method[] m = o.getClass().getMethods(); for (int i = 0; i < m.length; i++) { map.put(m[i].getName(),m[i]); if(cName.get(m[i].getName())!=null){ list.add(m[i]); } } Method[] m1 = (Method[])list.toArray(new Method[0]); HashMap keyMap = o.getPriKeyName(); String key = ""; String type = ""; for ( Iterator i = keyMap.keySet().iterator(); i.hasNext();) { key = (String) i.next(); type = (String) keyMap.get(key); } String sql = "select * from "+ o.getTable()+" where "+key+"=?"; try { Connection con = getMysql(); PreparedStatement st = con.prepareStatement(sql); if(type.equals("long")) st.setLong(1,Long.parseLong(id_.toString())); else st.setString(1,id_.toString()); ResultSet rs = st.executeQuery(); while (rs.next()) { for (int i = 0; i < m1.length; i++) { String name = cName.get(m1[i].getName()).toString(); type = m1[i].getParameterTypes()[0].getName(); if(type.equals("java.lang.String")) { m1[i].invoke(o,new Object[]{rs.getString(name)}); } else if(type.equals("long")){ m1[i].invoke(o,new Object[]{new Long(rs.getLong(name))}); } } o.isGetBean(true); } rs.close(); con.close(); return o; } catch (Throwable e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } private Connection getMysql() throws Exception, Throwable, ClassNotFoundException{ Class.forName("com.mysql.jdbc.Driver").newInstance(); Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "admin"); conn.setAutoCommit(false); return ConnectionProxy.newInstance(conn); } private boolean isGet = false; public boolean isGetBean() { return isGet; } public void isGetBean(boolean b) { isGet = b; } }

然后对应的Bean 是

package com.db.beans; import java.lang.reflect.InvocationTargetException; import java.util.ArrayList; import java.util.HashMap; import java.util.List; public class Person extends AbstractBean { public final static String TABLE_NAME="PERSON"; private long personId = -1; private long age = -1; private String firstName = null; private String lastName = null; private long state = -1; private PersonEmail personEmail = null; public String C_PERSON_ID = "PERSON_ID"; public String C_AGE = "AGE"; public String C_FIRSTNAME = "FIRSTNAME"; public String C_LASTNAME = "LASTNAME"; public String C_STATE = "STATE"; private HashMap cName = new HashMap(); private HashMap cMap = new HashMap();//存放列和值的对应 private HashMap uMap = new HashMap();//存放修改列的值 private HashMap relateBean = new HashMap(); public Person(){ cName.put("setAge",C_AGE); cName.put("setFirstName",C_FIRSTNAME); cName.put("setLastName",C_LASTNAME); cName.put("setPersonId",C_PERSON_ID); cName.put("setState",C_STATE); relateBean.put(PersonEmail.class,"array"); init(cMap,uMap,cName); } public long getState() { return state; } public void setState(long state) { if(this.state!=-1&&this.state!=state){ uMap.put(C_STATE,new Long(state)); } cMap.put(C_STATE,new Long(state)); this.state = state; } public long getAge() { return age; } public void setAge(long age) { if(this.age!=-1&&this.age!=age){ uMap.put(C_AGE,new Long(age)); } cMap.put(C_AGE,new Long(age)); this.age = age; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { if(this.firstName!=null&&!this.firstName.equals(firstName)){ uMap.put(C_FIRSTNAME,firstName); } cMap.put(C_FIRSTNAME,firstName); this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { if(this.lastName!=null&&!this.lastName.equals(lastName)){ uMap.put(C_LASTNAME,lastName); } cMap.put(C_LASTNAME,lastName); this.lastName = lastName; } public long getPersonId() { return personId; } public void setPersonId(long personId) { cMap.put(C_PERSON_ID,new Long(personId)); this.personId = personId; } public HashMap getPriKeyName() { HashMap map = new HashMap(); map.put("PERSON_ID","NUMBER"); return map; } public HashMap getPriKeyValue() { HashMap map = new HashMap(); map.put("PERSON_ID",new Long(personId)); return map; } public String getTable() { return TABLE_NAME; } public static Person getPerson(long personId) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException{ Person p = new Person(); return (Person) p.getBean(p,new Long(personId)); } public Person getPerson(String cond,HashMap map){ return null; } }

写个Main函数跑跑

public static void main(String[] args) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { Person p = Person.getPerson(1); System.out.println(p.getFirstName()); System.out.println(p.toString()); }

输出：

AbstractBean
ConnectionId=100000
ConnectionId=100000 Preparing Statement: select * from PERSON where PERSON_ID=?
PreparedStatementId=100001 Executing Statement: select * from PERSON where PERSON_ID=?
PreparedStatementId=100001 Parameters: [1]
PreparedStatementId=100001 Types: [java.lang.Long]
ResultSetId = 100002 ResultSet
ResultSetId =100002 Header: [AGE, FIRSTNAME, LASTNAME, PERSON_ID, STATE]
ResultSetId =100002 Result: [22, sun, lei, 1, 0]
sun
STATE=0
PERSON_ID=1
AGE=22
LASTNAME=lei
FIRSTNAME=sun

以上代码值得看的就是 protected BeanInterface getBean(BeanInterface o,Object id_) 方法

这个方法通过Method.invoke 来把每个字段set到bean里面，类似于dbutils里面原理。

明天继续，欢迎大家讨论。

http://blog.youkuaiyun.com/keyboardsun

作者KEYBOARDSUN