Mybatis中mapper代理方法

User.java  存储用户的信息

UserMapper.xml   配置查询用户的sql语句

SqlMapConfig.xml    加载配置文件(即全局配置文件)

UserMapper.java      mapper接口

UserMapperTest.java   数据库操作文件

UserMapperTest.java

public class UserMapperTest {
private SqlSessionFactory sqlSessionFactory;

@Before
public void setUp() throws Exception {
// MyBatis配置文件
String resource = "SqlMapConfig.xml";
// 得到配置文件流
InputStream inputStream = Resources.getResourceAsStream(resource);

// 创建会话工厂,想build中传入配置文件信息
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

}

@Test
public void testFindUserById() throws Exception {
SqlSession sqlSession = sqlSessionFactory.openSession();

// 创建UserMapper对象，mybatis自动生成mapper代理对象
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

// 调用userMapper的方法
User user = userMapper.findUserById(1);
sqlSession.close();
System.out.println(user);
}

@Test
public void testFindUserByName() throws Exception {
SqlSession sqlSession = sqlSessionFactory.openSession();

// 创建UserMapper对象，mybatis自动生成mapper代理对象
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

List<User> userList = userMapper.findUserByName("小明");
sqlSession.close();
System.out.println(userList);
}

}

UserMapper.java

package dancheng.mybatis.mapper;

import java.util.List;

import dancheng.mybatis.po.User;

/**
* mapper接口，相当于dao接口，用户管理
* @author Administrator
*
*/
public interface UserMapper {

//根据用户id查询
public User findUserById(int id) throws Exception;

//根据用户名查询
public List<User> findUserByName(String name) throws Exception;

//添加用户信息
public void insertUser(User user) throws Exception;
//删除用户信息
public void deleteUser(int id) throws Exception;
}

UserMapper.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="dancheng.mybatis.mapper.UserMapper">
<select id="findUserById" parameterType="int" resultType="dancheng.mybatis.po.User">
SELECT * FROM USER WHERE id=#{value}
</select>

<select id="findUserByName" parameterType="java.lang.String" resultType="dancheng.mybatis.po.User">
SELECT * FROM USER WHERE username LIKE '%${value}%'
</select>

<insert id="insertUser" parameterType="dancheng.mybatis.po.User">
<selectKey keyProperty="id" order="AFTER" resultType="java.lang.Integer">
SELECT LAST_INSERT_ID()
</selectKey>
insert into user(username,birthday,sex,address) value(#{username},#{birthday},#{sex},#{address})
</insert>

<delete id="deleteUser" parameterType="java.lang.Integer">
delete from user where id=#{id}
</delete>

<!--
需要传入用户的id
需要传入用户的更新信息
-->
<update id="updateUser" parameterType="dancheng.mybatis.po.User">
update user set username=#{username},birthday=#{birthday},sex=#{sex},address=#{address} where id=#{id}
</update>
</mapper>

SqlMapConfig.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>
<!-- 和spring整合后 environments配置将废除-->
<environments default="development">
<environment id="development">
<!-- 使用jdbc事务管理-->
<transactionManager type="JDBC" />
<!-- 数据库连接池-->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8" />
<property name="username" value="root" />
<property name="password" value="123" />
</dataSource>
</environment>
</environments>
<!-- 加载映射文件 -->
<mappers>
<mapper resource="mapper/UserMapper.xml"/>
</mappers>
</configuration>

User.java

package dancheng.mybatis.po;

import java.util.Date;

public class User {
private int id;
private String username;//  用户姓名
private String sex;// 性别
private Date birthday;// 生日
private String address;// 地址

public User(){}

public User(String username, String sex, Date birthday, String address) {
this.username = username;
this.sex = sex;
this.birthday = birthday;
this.address = address;
}
@Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", sex=" + sex
+ ", birthday=" + birthday + ", address=" + address + "]";
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}

}