MyBatis 中实现SQL语句中in的操作 (11)

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 FilesJavajdk1.8.0_25injava" -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:C:Users
ewsoftAppDataRoamingJetBrainsIntelliJ IDEA 2017.3.5libidea_rt.jar=1182:C:Users
ewsoftAppDataRoamingJetBrainsIntelliJ IDEA 2017.3.5in" -Dfile.encoding=UTF-8 -classpath "C:Users
ewsoftAppDataRoamingJetBrainsIntelliJ IDEA 2017.3.5libidea_rt.jar;C:Users
ewsoftAppDataRoamingJetBrainsIntelliJ IDEA 2017.3.5pluginsjunitlibjunit-rt.jar;C:Users
ewsoftAppDataRoamingJetBrainsIntelliJ IDEA 2017.3.5pluginsjunitlibjunit5-rt.jar;D:downloadlibmavenTollTransfermic-repositoryorgjunitplatformjunit-platform-launcher1.5.2junit-platform-launcher-1.5.2.jar;D:downloadlibmavenTollTransfermic-repositoryorgapiguardianapiguardian-api1.1.0apiguardian-api-1.1.0.jar;D:downloadlibmavenTollTransfermic-repositoryorgjunitplatformjunit-platform-engine1.5.2junit-platform-engine-1.5.2.jar;D:downloadlibmavenTollTransfermic-repositoryorgopentest4jopentest4j1.2.0opentest4j-1.2.0.jar;D:downloadlibmavenTollTransfermic-repositoryorgjunitplatformjunit-platform-commons1.5.2junit-platform-commons-1.5.2.jar;D:downloadlibmavenTollTransfermic-repositoryorgjunitjupiterjunit-jupiter-engine5.5.2junit-jupiter-engine-5.5.2.jar;D:downloadlibmavenTollTransfermic-repositoryorgjunitjupiterjunit-jupiter-api5.5.2junit-jupiter-api-5.5.2.jar;D:downloadlibmavenTollTransfermic-repositoryorgjunitvintagejunit-vintage-engine5.5.2junit-vintage-engine-5.5.2.jar;D:downloadlibmavenTollTransfermic-repositoryjunitjunit4.12junit-4.12.jar;D:downloadlibmavenTollTransfermic-repositoryorghamcresthamcrest-core1.3hamcrest-core-1.3.jar;C:Program FilesJavajdk1.8.0_25jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_25jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_25jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_25jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_25jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_25jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_25jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_25jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_25jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_25jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_25jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_25jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_25jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_25jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_25jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_25jrelibjce.jar;C:Program FilesJavajdk1.8.0_25jrelibjfr.jar;C:Program FilesJavajdk1.8.0_25jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_25jrelibjsse.jar;C:Program FilesJavajdk1.8.0_25jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_25jrelibplugin.jar;C:Program FilesJavajdk1.8.0_25jrelib
esources.jar;C:Program FilesJavajdk1.8.0_25jrelib
t.jar;D:ideaworkspaceProjectStudymybatis-02	argetclasses;D:downloadlibmavenTollTransfermic-repositoryorghamcresthamcrest-core2.1hamcrest-core-2.1.jar;D:downloadlibmavenTollTransfermic-repositoryorghamcresthamcrest2.1hamcrest-2.1.jar;D:downloadlibmavenTollTransfermic-repositoryorgmybatismybatis3.4.5mybatis-3.4.5.jar;D:downloadlibmavenTollTransfermic-repositorymysqlmysql-connector-java5.1.44mysql-connector-java-5.1.44.jar;D:downloadlibmavenTollTransfermic-repositorycglibcglib3.3.0cglib-3.3.0.jar;D:downloadlibmavenTollTransfermic-repositoryorgow2asmasm7.1asm-7.1.jar;D:downloadlibmavenTollTransfermic-repository
etlogstashlogbacklogstash-logback-encoder5.3logstash-logback-encoder-5.3.jar;D:downloadlibmavenTollTransfermic-repositorycomfasterxmljacksoncorejackson-databind2.10.3jackson-databind-2.10.3.jar;D:downloadlibmavenTollTransfermic-repositorycomfasterxmljacksoncorejackson-annotations2.10.3jackson-annotations-2.10.3.jar;D:downloadlibmavenTollTransfermic-repositorycomfasterxmljacksoncorejackson-core2.10.3jackson-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