Mybatis 一級緩存（20）

本文轉載自查看原文 2021-10-20 16:22 236 mybatis

Mybatis中的一級緩存和二級緩存（本博文只是針對一級緩存說明）

概述

ORM框架一般都會有緩存機制，做為其中一員的Mybatis也存在緩存。功能是用以提升查詢的效率和服務給數據庫帶來壓力。同樣的Mybatis也存在有一級緩存和二級緩存，並且預留了集成第三方緩存的接口類：【cache】。

緩存角色

【一級緩存】

MyBatis默認支持一級緩存。在沒有任何配置情況下，默認開啟一級緩存，MyBatis 的一級緩存是在會話（SqlSession）層面進行緩存的；
如果同樣SqlSession對象查詢相同數據，則只會查詢一次。因在第一次查詢時向數據庫發送SQL語句，並將查詢結果放入到SQLSESSION中（作為緩存存在）。后續在此做相同對象查詢時，則直接從緩存中查詢該對象即可（省略了訪問數據庫操作，提高查詢效率）；
Mybatis開啟一個數據庫會話時，會創建一個新的SqlSession對象表示一次數據庫會話，SqlSession對象中會有一個新的Executor對象。Executor對象持有一個新的PerpetualCache對象；會話結束時，SqllSession對象及其內部的 Executor 對象還有PerpetualCache對象都會一同釋放掉；
如SqlSession調用close()方法，會釋放掉一級緩存PerpetualCache對象，一級緩存將不可用；
如SqlSession調用clearCache()方法，會清空PerpetualCache對象中數據，但該對象仍可使用；
SqlSession中insert、update及delete，都會清空PerpetualCache對象的數據，但該對象仍可繼續使用。

一級緩存執行流程

MyBatis回話流程：當客戶端開啟一次數據回話SqlSession對象中創建一個本地緩存(local cache)。執行查詢前嘗試從本地緩存中查找是否存在，如果存在本地緩存中，就直接從緩存中取出，然后返回給客戶端。否則，從數據庫讀取數據，將查詢結果存入緩存並返回給用戶。

驗證（下面通過代碼進行實際驗證）：

1、pom文件

2、數據庫配置文件

<?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>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://127.0.0.1:3306/mybatis01"/>
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/cache/mapper/personMapper.xml"/>
    </mappers>
</configuration>

3、實體類

public class Person {
    /* 人員ID */
    private int id;
    /* 人員名稱 */
    private String name;
    /* 人員年齡 */
    private int age;
    /* 人員性別 */
    private Boolean sex;

    public Person() {
    }
    public Person(int id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
    public Person(int id, String name, int age, Boolean sex) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.sex = sex;
    }
    public Boolean getSex() {
        return sex;
    }
    public void setSex(Boolean sex) {
        this.sex = sex;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    @Override
    public String toString() {
        return "Person{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

4、接口類

package com.cache.mapper;

import com.cache.bean.Person;
import java.util.List;

// 操作mybatis接口
public interface PersonMapper {

    /* 根據ID查詢人員信息 */
    Person queryPersonById(int id);
   /*  根據ID修改人員信息 */
    void updateStudentById(Person person);
}

5、接口對應mapper類

<?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.cache.mapper.PersonMapper">
    <select id="queryPersonById" parameterType="int" resultType="com.cache.bean.Person">
        select
            id,name,age
        from
            t_person
        where
            id = #{id}
    </select>
 
    <update id="updateStudentById"  parameterType="com.cache.bean.Person">
        UPDATE t_person SET NAME =#{name},age = #{age} where id =#{id}
    </update>
</mapper>

6、數據庫表結構和數據

7、測試類

public class test {

    /**
     * 演示一級緩存：根據ID查詢人的信息
     */
    @Test
    public void test01() throws Exception{

        Reader reader = Resources.getResourceAsReader("mybatis-01.xml");
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);

        SqlSession session = sessionFactory.openSession();
        PersonMapper personMapper = session.getMapper(PersonMapper.class);
        /* 默認使用一級緩存演示 */
        Person person = personMapper.queryPersonById(1001);
        System.out.println("初次查詢結果為："+person);
        Person person01 = personMapper.queryPersonById(1001);
        System.out.println("第二次查詢結果為："+person);
        session.close();
}

執行結果：

"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=28708: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-cache-03\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\log4j\log4j\1.2.17\log4j-1.2.17.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\slf4j\slf4j-log4j12\1.7.12\slf4j-log4j12-1.7.12.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\slf4j\slf4j-api\1.7.30\slf4j-api-1.7.30.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.cache.test.test,test01
[lsjSso]2021-10-20 12:55:30,892-org.apache.ibatis.logging.LogFactory-0   [main]DEBUGorg.apache.ibatis.logging.LogFactory-Logging initialized using 'class org.apache.ibatis.logging.slf4j.Slf4jImpl' adapter.
[lsjSso]2021-10-20 12:55:31,036-org.apache.ibatis.datasource.pooled.PooledDataSource-144 [main]DEBUGorg.apache.ibatis.datasource.pooled.PooledDataSource-PooledDataSource forcefully closed/removed all connections.
[lsjSso]2021-10-20 12:55:31,037-org.apache.ibatis.datasource.pooled.PooledDataSource-145 [main]DEBUGorg.apache.ibatis.datasource.pooled.PooledDataSource-PooledDataSource forcefully closed/removed all connections.
[lsjSso]2021-10-20 12:55:31,037-org.apache.ibatis.datasource.pooled.PooledDataSource-145 [main]DEBUGorg.apache.ibatis.datasource.pooled.PooledDataSource-PooledDataSource forcefully closed/removed all connections.
[lsjSso]2021-10-20 12:55:31,037-org.apache.ibatis.datasource.pooled.PooledDataSource-145 [main]DEBUGorg.apache.ibatis.datasource.pooled.PooledDataSource-PooledDataSource forcefully closed/removed all connections.
[lsjSso]2021-10-20 12:55:31,137-org.apache.ibatis.transaction.jdbc.JdbcTransaction-245 [main]DEBUGorg.apache.ibatis.transaction.jdbc.JdbcTransaction-Opening JDBC Connection
[lsjSso]2021-10-20 12:55:31,414-org.apache.ibatis.datasource.pooled.PooledDataSource-522 [main]DEBUGorg.apache.ibatis.datasource.pooled.PooledDataSource-Created connection 52908367.
[lsjSso]2021-10-20 12:55:31,415-org.apache.ibatis.transaction.jdbc.JdbcTransaction-523 [main]DEBUGorg.apache.ibatis.transaction.jdbc.JdbcTransaction-Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@327514f]
[lsjSso]2021-10-20 12:55:31,418-com.cache.mapper.PersonMapper.queryPersonById-526 [main]DEBUGcom.cache.mapper.PersonMapper.queryPersonById-==>  Preparing: select id,name,age from t_person where id = ? 
[lsjSso]2021-10-20 12:55:31,459-com.cache.mapper.PersonMapper.queryPersonById-567 [main]DEBUGcom.cache.mapper.PersonMapper.queryPersonById-==> Parameters: 1001(Integer)
[lsjSso]2021-10-20 12:55:31,500-com.cache.mapper.PersonMapper.queryPersonById-608 [main]DEBUGcom.cache.mapper.PersonMapper.queryPersonById-<==      Total: 1
初次查詢結果為：Person{id=1001, name='zhangsan', age=27}
第二次查詢結果為：Person{id=1001, name='zhangsan', age=27}
[lsjSso]2021-10-20 12:55:31,501-org.apache.ibatis.transaction.jdbc.JdbcTransaction-609 [main]DEBUGorg.apache.ibatis.transaction.jdbc.JdbcTransaction-Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@327514f]
[lsjSso]2021-10-20 12:55:31,502-org.apache.ibatis.transaction.jdbc.JdbcTransaction-610 [main]DEBUGorg.apache.ibatis.transaction.jdbc.JdbcTransaction-Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@327514f]
[lsjSso]2021-10-20 12:55:31,502-org.apache.ibatis.datasource.pooled.PooledDataSource-610 [main]DEBUGorg.apache.ibatis.datasource.pooled.PooledDataSource-Returned connection 52908367 to pool.

Process finished with exit code 0

分析：

分析一：查詢兩次結果只進行一次查詢

分析二：查詢了兩次執行結果

驗證執行，commit操作后緩存失效：

第一：測試代碼修改update操作后再查詢兩次，其他保持不變：

A、修改測試代碼為：

@Test
    public void test01() throws Exception{

        Reader reader = Resources.getResourceAsReader("mybatis-01.xml");
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);

        SqlSession session = sessionFactory.openSession();
        PersonMapper personMapper = session.getMapper(PersonMapper.class);
        /* 默認使用一級緩存演示
        Person person = personMapper.queryPersonById(1001);
        System.out.println("初次查詢結果為："+person);
        Person person01 = personMapper.queryPersonById(1001);
        System.out.println("第二次查詢結果為："+person);
        session.close();
        */
        /* 清除緩存演示 */
        Person personFirst = personMapper.queryPersonById(1001);
        System.out.println("update執行前，操作第一次查詢結果為："+personFirst);
        Person personSecond = personMapper.queryPersonById(1001);
        System.out.println("update執行前，操作第二次查詢結果為："+personSecond);
        Person personEntity = new Person(1001,"HuanCun",26);
        personMapper.updateStudentById(personEntity);
        System.out.println("執行update操作，清除一級緩存！");
        session.commit();
        System.out.println("update執行后commit提交成功！");

        Person personEarCache = personMapper.queryPersonById(1001);
        System.out.println("update執行后，初次查詢結果為："+personEarCache);
        Person person01 = personMapper.queryPersonById(1001);
        System.out.println("update執行后，第二次查詢結果為："+person01);
        session.close();
    }

B、驗證結果

"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=13417: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-cache-03\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\log4j\log4j\1.2.17\log4j-1.2.17.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\slf4j\slf4j-log4j12\1.7.12\slf4j-log4j12-1.7.12.jar;D:\download\lib\mavenTollTransfer\mic-repository\org\slf4j\slf4j-api\1.7.30\slf4j-api-1.7.30.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.cache.test.test,test01
[lsjSso]2021-10-20 13:14:00,298-org.apache.ibatis.logging.LogFactory-0   [main]DEBUGorg.apache.ibatis.logging.LogFactory-Logging initialized using 'class org.apache.ibatis.logging.slf4j.Slf4jImpl' adapter.
[lsjSso]2021-10-20 13:14:00,459-org.apache.ibatis.datasource.pooled.PooledDataSource-161 [main]DEBUGorg.apache.ibatis.datasource.pooled.PooledDataSource-PooledDataSource forcefully closed/removed all connections.
[lsjSso]2021-10-20 13:14:00,459-org.apache.ibatis.datasource.pooled.PooledDataSource-161 [main]DEBUGorg.apache.ibatis.datasource.pooled.PooledDataSource-PooledDataSource forcefully closed/removed all connections.
[lsjSso]2021-10-20 13:14:00,459-org.apache.ibatis.datasource.pooled.PooledDataSource-161 [main]DEBUGorg.apache.ibatis.datasource.pooled.PooledDataSource-PooledDataSource forcefully closed/removed all connections.
[lsjSso]2021-10-20 13:14:00,460-org.apache.ibatis.datasource.pooled.PooledDataSource-162 [main]DEBUGorg.apache.ibatis.datasource.pooled.PooledDataSource-PooledDataSource forcefully closed/removed all connections.
[lsjSso]2021-10-20 13:14:00,554-org.apache.ibatis.transaction.jdbc.JdbcTransaction-256 [main]DEBUGorg.apache.ibatis.transaction.jdbc.JdbcTransaction-Opening JDBC Connection
[lsjSso]2021-10-20 13:14:00,832-org.apache.ibatis.datasource.pooled.PooledDataSource-534 [main]DEBUGorg.apache.ibatis.datasource.pooled.PooledDataSource-Created connection 52908367.
[lsjSso]2021-10-20 13:14:00,832-org.apache.ibatis.transaction.jdbc.JdbcTransaction-534 [main]DEBUGorg.apache.ibatis.transaction.jdbc.JdbcTransaction-Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@327514f]
[lsjSso]2021-10-20 13:14:00,834-com.cache.mapper.PersonMapper.queryPersonById-536 [main]DEBUGcom.cache.mapper.PersonMapper.queryPersonById-==>  Preparing: select id,name,age from t_person where id = ? 
[lsjSso]2021-10-20 13:14:00,869-com.cache.mapper.PersonMapper.queryPersonById-571 [main]DEBUGcom.cache.mapper.PersonMapper.queryPersonById-==> Parameters: 1001(Integer)
[lsjSso]2021-10-20 13:14:00,891-com.cache.mapper.PersonMapper.queryPersonById-593 [main]DEBUGcom.cache.mapper.PersonMapper.queryPersonById-<==      Total: 1
update執行前，操作第一次查詢結果為：Person{id=1001, name='HuanCun', age=26}
update執行前，操作第二次查詢結果為：Person{id=1001, name='HuanCun', age=26}
[lsjSso]2021-10-20 13:14:00,892-com.cache.mapper.PersonMapper.updateStudentById-594 [main]DEBUGcom.cache.mapper.PersonMapper.updateStudentById-==>  Preparing: UPDATE t_person SET NAME =?,age = ? where id =? 
[lsjSso]2021-10-20 13:14:00,892-com.cache.mapper.PersonMapper.updateStudentById-594 [main]DEBUGcom.cache.mapper.PersonMapper.updateStudentById-==> Parameters: HuanCun(String), 26(Integer), 1001(Integer)
[lsjSso]2021-10-20 13:14:00,950-com.cache.mapper.PersonMapper.updateStudentById-652 [main]DEBUGcom.cache.mapper.PersonMapper.updateStudentById-<==    Updates: 1
執行update操作，清除一級緩存！
[lsjSso]2021-10-20 13:14:00,951-org.apache.ibatis.transaction.jdbc.JdbcTransaction-653 [main]DEBUGorg.apache.ibatis.transaction.jdbc.JdbcTransaction-Committing JDBC Connection [com.mysql.jdbc.JDBC4Connection@327514f]
update執行后commit提交成功！
[lsjSso]2021-10-20 13:14:00,953-com.cache.mapper.PersonMapper.queryPersonById-655 [main]DEBUGcom.cache.mapper.PersonMapper.queryPersonById-==>  Preparing: select id,name,age from t_person where id = ? 
[lsjSso]2021-10-20 13:14:00,953-com.cache.mapper.PersonMapper.queryPersonById-655 [main]DEBUGcom.cache.mapper.PersonMapper.queryPersonById-==> Parameters: 1001(Integer)
[lsjSso]2021-10-20 13:14:00,954-com.cache.mapper.PersonMapper.queryPersonById-656 [main]DEBUGcom.cache.mapper.PersonMapper.queryPersonById-<==      Total: 1
update執行后，初次查詢結果為：Person{id=1001, name='HuanCun', age=26}
update執行后，第二次查詢結果為：Person{id=1001, name='HuanCun', age=26}
[lsjSso]2021-10-20 13:14:00,954-org.apache.ibatis.transaction.jdbc.JdbcTransaction-656 [main]DEBUGorg.apache.ibatis.transaction.jdbc.JdbcTransaction-Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@327514f]
[lsjSso]2021-10-20 13:14:00,955-org.apache.ibatis.transaction.jdbc.JdbcTransaction-657 [main]DEBUGorg.apache.ibatis.transaction.jdbc.JdbcTransaction-Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@327514f]
[lsjSso]2021-10-20 13:14:00,955-org.apache.ibatis.datasource.pooled.PooledDataSource-657 [main]DEBUGorg.apache.ibatis.datasource.pooled.PooledDataSource-Returned connection 52908367 to pool.

Process finished with exit code 0

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