MyBatis入门案例

package com.mybatis.entity;

public class User {
	private Long userId;
	private String userName;
	private Integer userAge;
	private String 	userAddress;
	private Type type;
	public Long getUserId() {
		return userId;
	}
	public void setUserId(Long userId) {
		this.userId = userId;
	}
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public Integer getUserAge() {
		return userAge;
	}
	public void setUserAge(Integer userAge) {
		this.userAge = userAge;
	}
	public String getUserAddress() {
		return userAddress;
	}
	public void setUserAddress(String userAddress) {
		this.userAddress = userAddress;
	}
	public Type getType() {
		return type;
	}
	public void setType(Type type) {
		this.type = type;
	}

	@Override
	public String toString() {
		return "User [userId=" + userId + ", userName=" + userName
				+ ", userAge=" + userAge + ", userAddress=" + userAddress
				+ ", type=" + type + "]";
	}

}

package com.mybatis.entity;

import java.util.HashSet;
import java.util.Set;

public class Type {

	private Long typeId;
	private String typeName;
	private Set<User> users = new HashSet<User>();

	public Long getTypeId() {
		return typeId;
	}
	public void setTypeId(Long typeId) {
		this.typeId = typeId;
	}
	public String getTypeName() {
		return typeName;
	}
	public void setTypeName(String typeName) {
		this.typeName = typeName;
	}
	public Set<User> getUsers() {
		return users;
	}
	public void setUsers(Set<User> users) {
		this.users = users;
	}
	@Override
	public String toString() {
		return "Type [typeId=" + typeId + ", typeName=" + typeName + ", users="
				+ users + "]";
	}

}

<?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="com.mybatis.dao.UserMapper">

	<!-- 定义用户集合对象 -->
	<resultMap type="user" id="userMap">
		<id column="id"  property="userId"/>
		<result column="userName" property="userName"/>
		<result column="userAge" property="userAge"/>
		<result column="userAddress" property="userAddress"/>
		<!-- 配置多对一的关联 -->
		<association property="type" column="typeId" javaType="type"  select="selectTypeInfoByTypeId"/>
	</resultMap>

	<select id="selectAllUsers" resultMap="userMap">
		select * from User
	</select>

	<select id="selectTypeInfoByTypeId" resultType="type">
		select * from type where typeId=#{typeId}
	</select>

	<select id="selectUserByUserId" parameterType="user" resultMap="userMap">
		<!-- 如果查询语句中只有一个参数可以随便写参数名称 -->
		select * from user where 1=1 
		<if test="userName!=null">
			AND userName=#{userName}
		</if>
	</select>

	<insert id="addUserInfo">
		<!-- 如果语句中存在多个参数，参数名称必须和属性名称一致 -->
		insert into user values(#{userId},#{userName},#{userAge},#{userAddress},#{type.typeId})
	</insert>

	<update id="updateUserInfo">
		update User set 
			userName=#{userName},
			userAge=#{userAge},
			userAddress=#{userAddress},
			typeId=#{type.typeId} 
			where id=#{userId}
	</update>

	<delete id="deleteUserByUserId">
		delete from user where id = #{id}
	</delete>
</mapper>

<?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="typeInfo">

	<!-- 定义类型信息对象 -->
	<resultMap type="type" id="typeMap">
		<id column="typeId" property="typeId" />
		<result column="typeName" property="typeName"/>
		<!-- 一对多 -->
		<collection property="users" column="typeId" ofType="user" select="selectUserByTypeId" />
	</resultMap>

	<select id="selectUserByTypeId" resultMap="com.mybatis.dao.UserMapper.userMap">
		select * from User where typeId = #{typeId}
	</select>

	<select id="selectTypeInfoByTypeId" resultMap="typeMap">
		select * from type where typeId=#{typeId}
	</select>
</mapper>

<?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>
	<!-- 给个实体取别名 -->
	<typeAliases>
		<typeAlias type="com.mybatis.entity.User" alias="user"/>
		<typeAlias type="com.mybatis.entity.Type" alias="type"/>
	</typeAliases>

	<!-- 配置数据源 
		注意：environment id属性值必须为和default的值相同
	-->
	<environments default="dev">
		<environment id="dev">
			<transactionManager type="JDBC" />
			<dataSource type="UNPOOLED">
				<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>

	<!-- 导入Mybatis映射文件 -->
	<mappers>
		<mapper resource="config/UserMapper.xml"/>
		<mapper resource="config/TypeMapper.xml"/>
	</mappers>
</configuration>

package com.mybatis.dao;

import com.mybatis.entity.User;

public interface UserMapper {
	int addUserInfo(User user);
}

package com.mybatis.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 org.junit.Test;

import com.mybatis.dao.UserMapper;
import com.mybatis.entity.Type;
import com.mybatis.entity.User;

public class TestMyBatis {

	private static SqlSessionFactory sqlSessionFactory;

	static {

		try {
			// 把mybatis-config.xml文件转换为字符流对象
			Reader reader = Resources.getResourceAsReader("mybatis-config.xml");
			sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	private SqlSession getSession() {
		return sqlSessionFactory.openSession();
	}

	@Test
	public void test() {
		System.out.println(sqlSessionFactory);
	}

	@Test
	public void testSelectAll() {
		List<Object> objects = (List<Object>) getSession().selectList("selectAllUsers");
		System.out.println(objects);
	}

	@Test
	public void testSelectUser() {
		User userInfo = new User();
		userInfo.setUserName("赞赏");
		List<Object> objects = (List<Object>) getSession().selectList("selectUserByUserId",userInfo);
		System.out.println(objects);
	}

	@Test
	public void insertUserInfo() {

		SqlSession session = getSession();
		// 创建用户对象
		User user = new User();
		user.setUserId(40002L);
		user.setUserName("展示那1");
		user.setUserAge(40);
		user.setUserAddress("重庆1");
		Type type = new Type();
		type.setTypeId(1003L);
		user.setType(type);
		session.insert("addUserInfo",user);
		session.commit();
		session.close();
	}

	@Test
	public void updateUserInfo() {

		SqlSession session = getSession();
		// 创建用户对象
		User user = new User();
		user.setUserId(40002L);
		user.setUserName("赞赏");
		user.setUserAge(40);
		user.setUserAddress("重庆1");
		Type type = new Type();
		type.setTypeId(1003L);
		user.setType(type);
		session.update("updateUserInfo",user);
		session.commit();
		session.close();
	}

	@Test
	public void deletetUser() {
		SqlSession session = getSession();
		int row = session.delete("deleteUserByUserId",40001);
		session.commit();
		session.close();

		System.out.println(row>0?"成功":"失败");
	}

	@Test // 测试一对多的管理查询
	public void selectTypeByTypeId() {
		SqlSession session = getSession();
		Type type = session.selectOne("typeInfo.selectTypeInfoByTypeId", 1003);
		System.out.println(type);
	}

	@Test // 开发中常用方法
	public void testAddUserInfo() {
		SqlSession session = getSession();
		UserMapper userMapper = session.getMapper(UserMapper.class);
		User user = new User();
		user.setUserId(40005L);
		user.setUserName("fdsfds");
		user.setUserAge(40);
		user.setUserAddress("hgfgd");
		Type type = new Type();
		type.setTypeId(1003L);
		user.setType(type);
		System.out.println(userMapper.addUserInfo(user));
		session.commit();
		session.close();
	}
}