mybatis之sql传递参数映射(六)

悠悠 2022-06-10 03:07 202阅读 0赞

1.传递包装类  
User类

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
        //set/get方法省略
        }

User包装类

public class UserQueryVo {
        private User user;
    
        public User getUser() {
            return user;
        }
    
        public void setUser(User user) {
            this.user = user;
        }
    
    }

UserMapper接口

public interface UserMapper {
        User findUserByName(UserQueryVo uv);
    }

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="com.test.mapper.UserMapper">
        //${}和#{}中的参数名需要和包装类中的对象层级一致,并且属性名要一致
        <select id="findUserByName" parameterType="com.test.domain.UserQueryVo" resultType="com.test.domain.User">
            SELECT * FROM USER WHERE username like '%${user.username}%' AND sex = #{user.sex}
        </select>
    </mapper>

测试代码

@Test
        public void test_04(){
            SqlSession sqlSession = sqlSessionFactory.openSession();
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
            UserQueryVo uv = new UserQueryVo();
            User user = new User();
            user.setUsername("五");
            user.setSex("2");
            uv.setUser(user);
            User user2 = userMapper.findUserByName(uv);
            System.out.println(user2);
        }

2.传递HashMap  
同传递POJO对象一样，map的key相当于pojo的属性。

UserMapper接口

public interface UserMapper {
        List<User> findUserByHashMap(Map<String, Object> map);
    }

UserMapper.xml

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    
    <mapper namespace="com.test.mapper.UserMapper">
        <select id="findUserByHashMap" parameterType="hashmap" resultType="com.test.domain.User">
            SELECT * FROM USER WHERE username like '%${username}%' AND sex = #{sex}
        </select>
    </mapper>

测试代码

@Test
        public void test_05(){
            SqlSession sqlSession = sqlSessionFactory.openSession();
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("username", "小");
            map.put("sex", "1");
            List<User> user2 = userMapper.findUserByHashMap(map);
            System.out.println(user2);
        }