Hibernate是非常完美的一个持久性框架,但是由于其考虑到各种功能和通用性,导致这个框架太大了,另外就是封装的太好了导致自主性比较小。所以Mybatis受到很多公司的欢迎。Mybatis以前叫做ibatis,用法稍微有点区别,在这里我用的是Mybatis 3
1.去官网下载Mybatis的Jar包 http://mybatis.github.io/
2.配置SqlMapConfig.xml文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 给bean取别名用在mapping文件中 -->
<typeAliases>
<typeAlias type="com.lubby.bean.Worker" alias="Worker" />
</typeAliases>
<environments default="development">
<environment id="development">
<!-- 使用JDBC的事务管理 -->
<transactionManager type="JDBC" />
<!-- 数据源 -->
<dataSource type="POOLED">
<property name="driver" value="org.postgresql.Driver" />
<property name="url" value="jdbc:postgresql://127.0.0.1:5432/lubby" />
<property name="username" value="admin" />
<property name="password" value="admin" />
</dataSource>
</environment>
</environments>
<!-- 这里可以写多个实体的映射文件 -->
<mappers>
<mapper resource="com/lubby/bean/WorkerSqlMap.xml" />
</mappers>
</configuration>
3.worker bean
package com.lubby.bean;
public class Worker {
private String id;
private String name;
int age;
public Worker() {
super();
}
public Worker(String id, String name, int age) {
super();
this.id = id;
this.name = name;
this.age = age;
}
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;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "Worker [id=" + id + ", name=" + name + ", age=" + age + "]";
}
}
3.bean的mapping配置文件 WorkerSqlMap.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- namespace用于java代码调用时识别指定xml的mapper文件 -->
<mapper namespace="com.lubby.bean">
<sql id="field">
id,name,age
</sql>
<select id="getAllWorker" resultType="Worker">
select
<include refid="field" />
from worker
</select>
<select id="getWorkerById" resultType="Worker">
select
<include refid="field" />
from worker where
id= #{id}
</select>
<select id="getWorkerByName" resultType="Worker">
select
<include refid="field" />
from worker where name like '%'||#{name}||'%'
</select>
<insert id="addWorker">
insert into worker (
<include refid="field" />
) values(#{id},#{name},#{age})
</insert>
<update id="updateWorker">
update worker set name=#{name} ,age=#{age} where
id=#{id}
</update>
<delete id="deleteWorkerById">
delete from worker where id=#{id};
</delete>
</mapper>
4.在主函数中使用mybatis
package com.lubby.test;
import java.io.IOException;
import java.io.Reader;
import java.util.List;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import com.lubby.bean.Worker;
public class Test {
public static void main(String[] args) {
SqlSessionFactory factory = null;
try {
Reader reader = Resources.getResourceAsReader("com/lubby/config/SqlMapConfig.xml");
factory = new SqlSessionFactoryBuilder().build(reader);
} catch (IOException e) {
e.printStackTrace();
}
SqlSession session = factory.openSession();
Worker worker = new Worker("003", "Join", 100);
//session.insert("com.lubby.bean.addWorker", worker);
//session.delete("com.lubby.bean.deleteWorkerById", "005");
//session.commit();
List<Worker> list = session.selectList("com.lubby.bean.getAllWorker");
System.out.println(session.selectOne("com.lubby.bean.getWorkerById", "001"));
System.out.println(session.update("com.lubby.bean.updateWorker", worker));
System.out.println(session.delete("com.lubby.bean.deleteWorkerById", "004"));
session.commit();
System.out.println(session.selectList("com.lubby.bean.getWorkerByName", "J"));
System.out.println(list);
}
}