mybatis实现CRUD操作（mysql数据库）（二）

接着前一篇继续说

1.创建了test2包与util包

2.MybatisUtils类的代码

package com.kpzc.util;

import java.io.InputStream;

import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import com.kpzc.test1.Test;


/**返回factory
 * @author kpzc
 *
 */
public class MybatisUtils {

	public static SqlSessionFactory getFactory() {
		String resource = "conf.xml";
		InputStream is = Test.class.getClassLoader().getResourceAsStream(
				resource);

		SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);

		return factory;
	}
}

　3.mapper文件

<?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">
<!-- 一般写包的路径（不带.xml） -->
<mapper namespace="com.kpzc.test2.userMapper">
	<!-- 
		根据id查询得到一个user对象
		parameterType id的参数类型
		resultType 写bean对象
	 -->
	 <select id="getUser" parameterType="int" resultType="com.kpzc.bean.User">
	 	select * from users where id=#{id}
	 </select>
	<insert id="addUser" parameterType="com.kpzc.bean.User">
	 	insert into users(name, age) values(#{name}, #{age})
	 </insert>
	 
	 <delete id="deleteUser" parameterType="int">
	 	delete from users where id=#{id}
	 </delete>
	 
	 <update id="updateUser" parameterType="com.kpzc.bean.User">
	 	update users set name=#{name},age=#{age} where id=#{id}
	 </update> 
	 <select id="getAllUsers" resultType="com.kpzc.bean.User">
	 	select * from users
	 </select>
</mapper>

　4.Test2.java（一个个测试，别冲突了）

package com.kpzc.test2;

import java.util.List;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.junit.Test;
import com.kpzc.bean.User;
import com.kpzc.util.MybatisUtils;

/**
 * @author kpzc
 *
 */
public class Test2 {

	/*@Test
	public void testAdd() {
		SqlSessionFactory factory = MybatisUtils.getFactory();
		SqlSession session = factory.openSession();
		String statement = "com.kpzc.test2.userMapper.addUser";
		int insert = session.insert(statement , new User(-2, "王者农药", 3));
		//提交
		session.commit();
		session.close();
		System.out.println(insert);
	}
	*/
	/*@Test
	public void testUpate() {
		SqlSessionFactory factory = MybatisUtils.getFactory();
		SqlSession session = factory.openSession(true);		
		String statement = "com.kpzc.test2.userMapper.updateUser";
		int update = session.update(statement, new User(5, "kKpzcc", 4));
		session.close();
		System.out.println(update);
	}
*/	
/*	@Test
	public void testDelete() {
		SqlSessionFactory factory = MybatisUtils.getFactory();
		SqlSession session = factory.openSession(true);
		String statement = "com.kpzc.test2.userMapper.deleteUser";
		int delete = session.delete(statement, 5);
		session.close();
		System.out.println(delete);
	}*/
	
	@Test
	public void testGetUser() {
		SqlSessionFactory factory = MybatisUtils.getFactory();
		SqlSession session = factory.openSession(true);
		String statement = "com.kpzc.test2.userMapper.getUser";
		User user = session.selectOne(statement, 1);
		session.close();
		System.out.println(user);
	}
	
	/*@Test
	public void testGetAll() {
		SqlSessionFactory factory = MybatisUtils.getFactory();
		SqlSession session = factory.openSession(true);
		String statement = "com.kpzc.test2.userMapper.getAllUsers";
		List<User> list = session.selectList(statement);
		session.close();
		System.out.println(list);
	}
	*/
}

　5.还有conf.xml(添加上这句<mapper resource="com/kpzc/test2/userMapper.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>
<!-- 
	development : 开发模式
	work : 工作模式
 -->
	<environments default="development">
		<environment id="development">
			<transactionManager type="JDBC" />
			<dataSource type="POOLED">
				<property name="driver" value="com.mysql.jdbc.Driver" />
				<property name="url" value="jdbc:mysql://localhost:3306/mybatis" />
				<property name="username" value="root" />
				<property name="password" value="" />
			</dataSource>
		</environment>
	</environments>
	
	<mappers>
	<!-- 写mapper所在的包的路径 -->
		<mapper resource="com/kpzc/test1/userMapper.xml"/>
		 <mapper resource="com/kpzc/test2/userMapper.xml"/>
	</mappers>
</configuration>