IBATIS技术

 首先来看看配置文件。据自己目前了解。好像最少得两个。官方的例子就是两个。

我这里举例是三个配置文件

名字跟官方命名的一样，其中这个一个是SqlMapConfig.xml ，配置如下：

 

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMapConfig     
    PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"     
    "http://ibatis.apache.org/dtd/sql-map-config-2.dtd">
<sqlMapConfig>

<!--注意这里是完整路径名-->
 <properties resource="com/fssoft/SqlMap.properties"  />
 <transactionManager type="JDBC">
  <dataSource type="SIMPLE">
   <property name="JDBC.Driver" value="${driver}" />
   <property name="JDBC.ConnectionURL" value="${url}" />
   <property name="JDBC.Username" value="${username}" />
   <property name="JDBC.Password" value="${password}" />
  </dataSource>
 </transactionManager>
 <sqlMap resource="com/fssoft/Log.xml" />
</sqlMapConfig>

然后连接的jdbc的配置文件命名SqlMap.properties ，我这里用的是MySQL

 

driver=com.mysql.jdbc.Driver
url=jdbc\:mysql\://127.0.0.1\:3306/xlnewsdb
username=root
password=root

以Log表为例子首先要有Log这个实体类

 

package com.fssoft.vo;

import java.util.Date;

public class Log {
 private int lid;
 private String message;
 private Date ldate;
 private String lname;

 @Override
 public String toString() {
  return "Log [ldate=" + ldate + ", lid=" + lid + ", lname=" + lname
    + ", message=" + message + "]";
 }

 public int getLid() {
  return lid;
 }

 public void setLid(int lid) {
  this.lid = lid;
 }

 public String getMessage() {
  return message;
 }

 public void setMessage(String message) {
  this.message = message;
 }

 public Date getLdate() {
  return ldate;
 }

 public void setLdate(Date ldate) {
  this.ldate = ldate;
 }

 public String getLname() {
  return lname;
 }

 public void setLname(String lname) {
  this.lname = lname;
 }

}

 

然后接着是Log.xml ：

 

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE sqlMap     
    PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"     
    "http://ibatis.apache.org/dtd/sql-map-2.dtd">
<sqlMap namespace="Log">

  <typeAlias alias="Log" type="com.fssoft.vo.Log"/>

  <resultMap id="LogResult" class="Log">
    <result property="lid" column="lid"/>
    <result property="message" column="message"/>
    <result property="ldate" column="ldate"/>
    <result property="lname" column="lname"/>
  </resultMap>

  <select id="selectAllLogs" resultMap="LogResult">
    select * from Log
  </select>
</sqlMap>

 

刚开始看官方的配置认为这些似曾相似，但事实上就是以前学习的基础

在这里我只是简单的写了查询，所以接口跟实现类都很简单ILogDAO：

package com.fssoft.dao;

import java.util.List;

import com.fssoft.vo.Log;

public interface ILogDAO {
 List<Log> getAllLogs();
}

 

package com.fssoft.dao.impl;

import java.io.IOException;
import java.io.Reader;
import java.sql.SQLException;
import java.util.List;

import com.fssoft.dao.ILogDAO;
import com.fssoft.vo.Log;
import com.ibatis.common.resources.Resources;
import com.ibatis.sqlmap.client.SqlMapClient;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;

public class LogDAOImpl implements ILogDAO {

 private static SqlMapClient sqlMapClient = null;

 static {
  try {
   //读取配置
   Reader reader = Resources
     .getResourceAsReader("com/fssoft/SqlMapConfig.xml");
   sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
  } catch (IOException e) {
   e.printStackTrace();
  }
 }

 @SuppressWarnings("unchecked")
 public List<Log> getAllLogs() {
  List<Log> log = null;
  try {
   log = sqlMapClient.queryForList("selectAllLogs");
  } catch (SQLException e) {
   e.printStackTrace();
  }
  return log;
 }
}

 

package com.test;

import org.junit.Test;

import com.fssoft.dao.ILogDAO;
import com.fssoft.dao.impl.LogDAOImpl;
import com.fssoft.vo.Log;

public class IbatisTest {
 @Test
 public void getAll(){
  try {
   ILogDAO logDAO = new LogDAOImpl();
   for (Log log:logDAO.getAllLogs()){
    System.out.println(log);
   }
   
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
}