MyBatis中映射文件的输入映射为pojo包装类型

╰+攻爆jí腚メ 2022-06-15 04:57 188阅读 0赞

MyBatis中映射文件的输入映射为pojo包装类型  
自定义pojo类（User.java）

package com.hl.myabtis.first.beas;
    
    import java.util.Date;
    
    public class User { 
    
        private int id;
        private String username;
        private char sex;
        private Date birthday;
        private String address;
        public String getUsername() {
            return username;
        }
        public void setUsername(String username) {
            this.username = username;
        }
        public char getSex() {
            return sex;
        }
        public void setSex(char 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;
        }
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        @Override
        public String toString() {
            return "User [id=" + id + ", username=" + username + ", sex=" + sex
                    + ", birthday=" + birthday + ", address=" + address + "]";
        }
    
    }

自定义pojo类的增强类（UserCustomer .java）

package com.hl.myabtis.first.beas;
    
    /** * 用户增强类 * @author 浪丶荡 * */
    public class UserCustomer extends User{ 
        //可以扩展用户类
    }

用于综合查询的包装类（UserQueryVo .java）

package com.hl.myabtis.first.beas;
    
    /** * 查询用户包装类型 * @author 浪丶荡 * */
    public class UserQueryVo extends User{ 
        //包装用户类增强类
        private UserCustomer userCustomer;
        //还可以包装其他的（订但、商品等）
    
    
        public UserCustomer getUserCustomer() {
            return userCustomer;
        }
    
        public void setUserCustomer(UserCustomer userCustomer) {
            this.userCustomer = userCustomer;
        }
    }

Mapper接口（UserMapper.java）

package com.hl.mybatis.first.mapper;
    
    
    import java.util.List;
    
    import com.hl.myabtis.first.beas.User;
    import com.hl.myabtis.first.beas.UserCustomer;
    import com.hl.myabtis.first.beas.UserQueryVo;
    
    public interface UserMapper { 
    
        //根据id查询用户信息
        public User findUserById(int id) throws Exception;
        //添加用户信息
        public void insertUser(User user);
        //根据id删除用户
        public void deleteUser(int id);
        //根据用户姓名模糊查找
        public List<User> findUserByName(String name);
        //用户信息的综合查询
        public List<UserCustomer> fingUserList(UserQueryVo userQueryVo) throws Exception;
    }

mapper.xml映射文件

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    
    <mapper namespace="com.hl.mybatis.first.mapper.UserMapper">
        
        <select id="findUserById" parameterType="int" resultType="user">
            select * FROM user WHERE id = #{id}
        </select>
        
        <select id="findUserByName" parameterType="String" resultType="user">
            select * FROM user WHERE address LIKE '%${value}%'
        </select>
        
        <select id="fingUserList" parameterType="com.hl.myabtis.first.beas.UserQueryVo" resultType="com.hl.myabtis.first.beas.UserCustomer">
            select * from user where user.sex=#{userCustomer.sex} or user.address like '$%{userCustomer.address}%'
        </select>
    
    
        
        <insert id="insertUser" parameterType="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 = #{value}
        </delete>
        
         <update id="updateUserByID" parameterType="user">
            update user set username = #{username},birthday = #{birthday},sex = #{sex},address = #{address} where id = #{id}
         </update>
    </mapper>

全局配置文件

<?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>
        
        <properties resource="db.properties" />
        
        
        <typeAliases>
            
            
            <package name="com.hl.myabtis.first.beas"/>
        </typeAliases>
    
      <environments default="development">
        <environment id="development">
          <transactionManager type="JDBC"/>
          <dataSource type="POOLED">
            <property name="driver" value="${jdbc.driver}"/>
            <property name="url" value="${jdbc.url}"/>
            <property name="username" value="${jdbc.username}"/>
            <property name="password" value="${jdbc.password}"/>
          </dataSource>
        </environment>
      </environments>
      
      <mappers>
        <mapper resource="sqlmap/user.xml"/>
        <mapper class="com.hl.mybatis.first.mapper.UserMapper"/>
      </mappers>
    </configuration>

db参数：

jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/MyBatis?useUnicode=true&characterEncoding=UTF8
    jdbc.username=root
    jdbc.password=123456

测试类：

@Test
        public void testfindUserList() throws Exception{
            SqlSession sqlSession = sqlSessionFactory.openSession();
            UserMapper usermapper = sqlSession.getMapper(UserMapper.class);
            //构建一个包装类
            UserQueryVo userQueryVo = new UserQueryVo();
            //构建一个增强类
            UserCustomer userCustomer = new UserCustomer();
            userCustomer.setAddress("明月");
            userCustomer.setSex('1');
            //包装类包装这增强类作为查询条件
            userQueryVo.setUserCustomer(userCustomer);
    
    
            List<UserCustomer> userList = usermapper.fingUserList(userQueryVo);
            sqlSession.close();
            for (UserCustomer user : userList) {
                System.out.println(user);
            }
        }