northeastTycoon

MyBatis 中实现SQL语句中in的操作

概括:应用myBatis实现SQL查询中IN的操作

1、数据库结构及其数据

 

 2、mapper.xml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">
<mapper namespace="com.mybatis03.mapper.PersonMapper">   
 <!-- foreach 操作 -->
    <select id="queryPersonWithInIDs" parameterType="com.mybatis03.bean.PersonIDs" resultType="com.mybatis03.bean.Person">
        select * from  t_person_01
        <!-- where 只会处理第一个条件 -->
<!--   
    1、PersonIDs 为集合类
    2、personNos  为PersonIDs集合类中的属性
    3、personNo 为遍历personNos  的临时变量(相当于 for循环中的i)
    4、separator 作用为 select * from  t_person_01 where in(1001,1002,1003) 中的分割符号逗号,既:“,”
  -->
        <where>
            <if test="personNos !=null and personNos.size >0 ">
                <foreach collection="personNos" open=" and id in(" close=")" item="personNo" separator=",">
                  #{personNo}
                </foreach>
            </if>
        </where>
    </select>

</mapper>

3、接口类

/**
 * @author :jack.zhao
 * @Describe: 操作mybatis接口
 * @date :2021-10-16 22:55
 */
public interface PersonMapper {   
// 人员编号集合(根据人员id集合查询)select * from t_person_01 where id in(1001,1002,1003);
    List<Person> queryPersonWithInIDs(PersonIDs personIDs);
}

4、作为查询条件集合类

package com.mybatis03.bean;

import java.util.List;

/**
 * @author :jack.zhao
 * @Describe: 查询条件集合类
 * @date :2021-10-16 22:55
 */
public class PersonIDs {

    public List<Integer> getPersonNos() {
        return personNos;
    }

    public void setPersonNos(List<Integer> personNos) {
        this.personNos = personNos;
    }

    // 人员编号集合(根据人员id集合查询)select * from t_person_01 where id in(1001,1002,1003);
    private List<Integer> personNos;
}

5、测试类中测试方法

/**
 * @author :jack.zhao
 * @Describe: 测试类
 * @date :2021-10-16 22:55
 */
public class test03 {
 //  // 人员编号集合(根据人员id集合查询)select * from t_person_01 where id in(1001,1002,1003);
    @Test
    public void queryPersonWithInIDs() throws Exception{
        Reader reader = Resources.getResourceAsReader("mybatis-03.xml");
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);

        SqlSession session = sessionFactory.openSession();
        PersonIDs personIDs = new PersonIDs();

        List<Integer> lists = new ArrayList<>();
        lists.add(1001);
        lists.add(1002);
        lists.add(1003);
        personIDs.setPersonNos(lists);


        // 动态代理
        PersonMapper personMapper = session.getMapper(PersonMapper.class);
        List<Person> personList = personMapper.queryPersonWithInIDs(personIDs);
        System.out.println("动态SQL查询结果为:"+personList);
        session.close();
    }
}

查询结果:

"C:\Program Files\Java\jdk1.8.0_25\bin\java" -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:C:\Users\newsoft\AppData\Roaming\JetBrains\IntelliJ IDEA 2017.3.5\lib\idea_rt.jar=1182:C:\Users\newsoft\AppData\Roaming\JetBrains\IntelliJ IDEA 2017.3.5\bin" -Dfile.encoding=UTF-8 -classpath "C:\Users\newsoft\AppData\Roaming\JetBrains\IntelliJ IDEA 2017.3.5\lib\idea_rt.jar;C:\Users\newsoft\AppData\Roaming\JetBrains\IntelliJ IDEA 2017.3.5\plugins\junit\lib\junit-rt.jar;C:\Users\newsoft\AppData\Roaming\JetBrains\IntelliJ IDEA 2017.3.5\plugins\junit\lib\junit5-rt.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\junit\platform\junit-platform-launcher\1.5.2\junit-platform-launcher-1.5.2.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\apiguardian\apiguardian-api\1.1.0\apiguardian-api-1.1.0.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\junit\platform\junit-platform-engine\1.5.2\junit-platform-engine-1.5.2.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\opentest4j\opentest4j\1.2.0\opentest4j-1.2.0.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\junit\platform\junit-platform-commons\1.5.2\junit-platform-commons-1.5.2.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\junit\jupiter\junit-jupiter-engine\5.5.2\junit-jupiter-engine-5.5.2.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\junit\jupiter\junit-jupiter-api\5.5.2\junit-jupiter-api-5.5.2.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\junit\vintage\junit-vintage-engine\5.5.2\junit-vintage-engine-5.5.2.jar;D:\download\lib\mavenTollTransfer\mic-repository\junit\junit\4.12\junit-4.12.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_25\jre\lib\rt.jar;D:\ideaworkspace\ProjectStudy\mybatis-02\target\classes;D:\download\lib\mavenTollTransfer\mic-repository\org\hamcrest\hamcrest-core\2.1\hamcrest-core-2.1.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\hamcrest\hamcrest\2.1\hamcrest-2.1.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\mybatis\mybatis\3.4.5\mybatis-3.4.5.jar;D:\download\lib\mavenTollTransfer\mic-repository\mysql\mysql-connector-java\5.1.44\mysql-connector-java-5.1.44.jar;D:\download\lib\mavenTollTransfer\mic-repository\cglib\cglib\3.3.0\cglib-3.3.0.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\ow2\asm\asm\7.1\asm-7.1.jar;D:\download\lib\mavenTollTransfer\mic-repository\net\logstash\logback\logstash-logback-encoder\5.3\logstash-logback-encoder-5.3.jar;D:\download\lib\mavenTollTransfer\mic-repository\com\fasterxml\jackson\core\jackson-databind\2.10.3\jackson-databind-2.10.3.jar;D:\download\lib\mavenTollTransfer\mic-repository\com\fasterxml\jackson\core\jackson-annotations\2.10.3\jackson-annotations-2.10.3.jar;D:\download\lib\mavenTollTransfer\mic-repository\com\fasterxml\jackson\core\jackson-core\2.10.3\jackson-core-2.10.3.jar" com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 -junit5 com.mybatis03.test.test03,queryPersonWithInIDs
动态SQL查询结果为:[Person{id=1001, name='zhangsan', age=27, sex=true, address=null}, Person{id=1002, name='chenqi', age=29, sex=true, address=null}, Person{id=1003, name='maliu', age=16, sex=true, address=null}]

Process finished with exit code 0

 

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