为了使用Mybatis进行持久化操作,通常有如下操作步骤:
- 开发持久化类PO和编写持久化操作的Mapper.xml, 在其中定义要执行的SQL语句
- 获取SqlSessionFactory
- 获取SqlSession
- 用面向对象的方式操作数据库
- 关闭事务,关闭SqlSession
Mapper.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">
<mapper namespace="org.tsui.mapper.UserMapper" >
<insert id="save" parameterType="org.tsui.domain.User" useGeneratedKeys="true">
INSERT INTO tb_user(name, sex, age) VALUES(#{name}, #{sex}, #{age})
</insert>
</mapper>
MyBatis的配置文件mybatis-config.xml
<?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>
<settings>
<setting name="logImpl" value="LOG4J"/>
</settings>
<environments default="mysql">
<environment id="mysql">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://127.0.0.1:3306/mybatis"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="org/tsui/mapper/UserMapper.xml"/>
</mappers>
</configuration>
测试代码
package org.tsui.tst;
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 org.tsui.domain.User;
import java.io.IOException;
import java.io.InputStream;
public class MybatisTest {
public static void main(String[] args) throws IOException {
//读取mybatis-config.xml文件
InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
//初始化mybatis,创建SqlSessionFactory实例
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
//创建Session实例
SqlSession session = factory.openSession();
//创建User对象
User user = new User();
user.setName("cuiyunhong");
user.setAge(22);
user.setSex("男");
//插入数据
session.insert("org.tsui.mapper.UserMapper.save", user);
//提交事务
session.commit();
//关闭session
session.close();
}
}