Hibernate的Session中一级缓存

其他 2018-06-11 16:32:50 阅读次数: 0 
package easyStart.Run;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

import easyStart.Entity.User;

public class QuickStart {

    public static void main(String[] args) {

        final StandardServiceRegistry registry = new StandardServiceRegistryBuilder().configure().build();
        SessionFactory sessionFactory = null;
        try {
            sessionFactory = new MetadataSources(registry).buildMetadata().buildSessionFactory();
        } catch (Exception e) {
            StandardServiceRegistryBuilder.destroy(registry);
        }

        Session session = sessionFactory.openSession();
        session.beginTransaction();
        // 处理事务 Begin
        
        User user1 = session.get(User.class, 1);
        User user2 = session.get(User.class, 1);
        System.out.println(user1==user2);
        
        // 处理事务 End
        session.getTransaction().commit();
        session.close();
        sessionFactory.close();
    }

}

问题：控制台输出结果是TRUE 还是 FALSE？

 1 六月 11, 2018 4:59:57 下午 org.hibernate.Version logVersion
 2 INFO: HHH000412: Hibernate Core {5.0.1.Final}
 3 六月 11, 2018 4:59:57 下午 org.hibernate.cfg.Environment <clinit>
 4 INFO: HHH000206: hibernate.properties not found
 5 六月 11, 2018 4:59:57 下午 org.hibernate.cfg.Environment buildBytecodeProvider
 6 INFO: HHH000021: Bytecode provider name : javassist
 7 六月 11, 2018 4:59:57 下午 org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
 8 INFO: HCANN000001: Hibernate Commons Annotations {5.0.0.Final}
 9 六月 11, 2018 4:59:57 下午 org.hibernate.boot.jaxb.internal.stax.LocalXmlResourceResolver resolveEntity
10 WARN: HHH90000012: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/hibernate-mapping. Use namespace http://www.hibernate.org/dtd/hibernate-mapping instead.  Support for obsolete DTD/XSD namespaces may be removed at any time.
11 六月 11, 2018 4:59:58 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
12 WARN: HHH000402: Using Hibernate built-in connection pool (not for production use!)
13 六月 11, 2018 4:59:58 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
14 INFO: HHH000401: using driver [com.mysql.cj.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/ssh?serverTimezone=GMT&useSSL=false]
15 六月 11, 2018 4:59:58 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
16 INFO: HHH000046: Connection properties: {user=root, password=****}
17 六月 11, 2018 4:59:58 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
18 INFO: HHH000006: Autocommit mode: false
19 六月 11, 2018 4:59:58 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
20 INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
21 六月 11, 2018 4:59:58 下午 org.hibernate.dialect.Dialect <init>
22 INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLInnoDBDialect
23 六月 11, 2018 4:59:58 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
24 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
25 六月 11, 2018 4:59:58 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
26 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
27 六月 11, 2018 4:59:58 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
28 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
29 六月 11, 2018 4:59:59 下午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
30 INFO: HHH000228: Running hbm2ddl schema update
31 Hibernate: 
32     select
33         user0_.ID as ID1_0_0_,
34         user0_.NAME as NAME2_0_0_,
35         user0_.ADDRESS as ADDRESS3_0_0_ 
36     from
37         USER user0_ 
38     where
39         user0_.ID=?
40 true
41 六月 11, 2018 4:59:59 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
42 INFO: HHH000030: Cleaning up connection pool [jdbc:mysql://localhost:3306/ssh?serverTimezone=GMT&useSSL=false]
日志输出

由运行后日志输出可以看出，查询语句仅仅执行了1条！也就是说session的get方法第一次执行了SQL查询，第二次是取得第一次查询的缓存！

而且结果输出TRUE，user1==user2！

 session.get方法进行查询，如果查询不到结果返回NULL；

 session.load方法进行查询，如果查询不到结果抛出异常；

session.flush();会发起一条update语句；当事务提交的时候，强制使得数据库中的数据和缓存中的数据一致！

 1 package easyStart.Run;
 2 
 3 import org.hibernate.Session;
 4 import org.hibernate.SessionFactory;
 5 import org.hibernate.boot.MetadataSources;
 6 import org.hibernate.boot.registry.StandardServiceRegistry;
 7 import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
 8 
 9 import easyStart.Entity.User;
10 
11 public class QuickStart {
12 
13     public static void main(String[] args) {
14 
15         final StandardServiceRegistry registry = new StandardServiceRegistryBuilder().configure().build();
16         SessionFactory sessionFactory = null;
17         try {
18             sessionFactory = new MetadataSources(registry).buildMetadata().buildSessionFactory();
19         } catch (Exception e) {
20             StandardServiceRegistryBuilder.destroy(registry);
21         }
22 
23         Session session = sessionFactory.openSession();
24         session.beginTransaction();
25         // 处理事务 Begin
26         User user = session.load(User.class, 2);
27         user.setAddress("JangSu-ChangZhou");
28         session.flush();
29         // 处理事务 End
30         session.getTransaction().commit();
31         session.close();
32         sessionFactory.close();
33     }
34 
35 }
Java代码

执行后，结果：

 1 六月 11, 2018 5:16:50 下午 org.hibernate.Version logVersion
 2 INFO: HHH000412: Hibernate Core {5.0.1.Final}
 3 六月 11, 2018 5:16:50 下午 org.hibernate.cfg.Environment <clinit>
 4 INFO: HHH000206: hibernate.properties not found
 5 六月 11, 2018 5:16:50 下午 org.hibernate.cfg.Environment buildBytecodeProvider
 6 INFO: HHH000021: Bytecode provider name : javassist
 7 六月 11, 2018 5:16:51 下午 org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
 8 INFO: HCANN000001: Hibernate Commons Annotations {5.0.0.Final}
 9 六月 11, 2018 5:16:51 下午 org.hibernate.boot.jaxb.internal.stax.LocalXmlResourceResolver resolveEntity
10 WARN: HHH90000012: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/hibernate-mapping. Use namespace http://www.hibernate.org/dtd/hibernate-mapping instead.  Support for obsolete DTD/XSD namespaces may be removed at any time.
11 六月 11, 2018 5:16:52 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
12 WARN: HHH000402: Using Hibernate built-in connection pool (not for production use!)
13 六月 11, 2018 5:16:52 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
14 INFO: HHH000401: using driver [com.mysql.cj.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/ssh?serverTimezone=GMT&useSSL=false]
15 六月 11, 2018 5:16:52 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
16 INFO: HHH000046: Connection properties: {user=root, password=****}
17 六月 11, 2018 5:16:52 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
18 INFO: HHH000006: Autocommit mode: false
19 六月 11, 2018 5:16:52 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
20 INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
21 六月 11, 2018 5:16:52 下午 org.hibernate.dialect.Dialect <init>
22 INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLInnoDBDialect
23 六月 11, 2018 5:16:52 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
24 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
25 六月 11, 2018 5:16:52 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
26 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
27 六月 11, 2018 5:16:52 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
28 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
29 六月 11, 2018 5:16:52 下午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
30 INFO: HHH000228: Running hbm2ddl schema update
31 Hibernate: 
32     select
33         user0_.ID as ID1_0_0_,
34         user0_.NAME as NAME2_0_0_,
35         user0_.ADDRESS as ADDRESS3_0_0_ 
36     from
37         USER user0_ 
38     where
39         user0_.ID=?
40 Hibernate: 
41     update
42         USER 
43     set
44         NAME=?,
45         ADDRESS=? 
46     where
47         ID=?
48 六月 11, 2018 5:16:53 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
49 INFO: HHH000030: Cleaning up connection pool [jdbc:mysql://localhost:3306/ssh?serverTimezone=GMT&useSSL=false]
日志信息

可以看出当user.setAddress("JangSu-ChangZhou");执行了过后，影响了缓存中的内容，然后session.flush();函数强制更新了数据库，导致了数据库中的数据发生了变化！

 注意了：session.flush();会发起一条update语句；但是还不会提交事务，只有事务被提交了，才会改变数据库的语句；

refresh()方法：他会强制发出一条SELECT语句，与缓存数据比较，如有不同，强制更新缓存使其与数据库一致！

 1 package easyStart.Run;
 2 
 3 import org.hibernate.Session;
 4 import org.hibernate.SessionFactory;
 5 import org.hibernate.boot.MetadataSources;
 6 import org.hibernate.boot.registry.StandardServiceRegistry;
 7 import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
 8 
 9 import easyStart.Entity.User;
10 
11 public class QuickStart {
12 
13     public static void main(String[] args) {
14 
15         final StandardServiceRegistry registry = new StandardServiceRegistryBuilder().configure().build();
16         SessionFactory sessionFactory = null;
17         try {
18             sessionFactory = new MetadataSources(registry).buildMetadata().buildSessionFactory();
19         } catch (Exception e) {
20             StandardServiceRegistryBuilder.destroy(registry);
21         }
22 
23         Session session = sessionFactory.openSession();
24         session.beginTransaction();
25         // 处理事务 Begin
26         User user = session.load(User.class, 2);
27         user.setAddress("JangSu-NanJing");
28         System.out.println(user);
29         session.refresh(user);
30         System.out.println(user);
31         // 处理事务 End
32         session.getTransaction().commit();
33         session.close();
34         sessionFactory.close();
35     }
36 
37 }
java源码 
 1 六月 11, 2018 5:36:37 下午 org.hibernate.Version logVersion
 2 INFO: HHH000412: Hibernate Core {5.0.1.Final}
 3 六月 11, 2018 5:36:37 下午 org.hibernate.cfg.Environment <clinit>
 4 INFO: HHH000206: hibernate.properties not found
 5 六月 11, 2018 5:36:37 下午 org.hibernate.cfg.Environment buildBytecodeProvider
 6 INFO: HHH000021: Bytecode provider name : javassist
 7 六月 11, 2018 5:36:37 下午 org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
 8 INFO: HCANN000001: Hibernate Commons Annotations {5.0.0.Final}
 9 六月 11, 2018 5:36:37 下午 org.hibernate.boot.jaxb.internal.stax.LocalXmlResourceResolver resolveEntity
10 WARN: HHH90000012: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/hibernate-mapping. Use namespace http://www.hibernate.org/dtd/hibernate-mapping instead.  Support for obsolete DTD/XSD namespaces may be removed at any time.
11 六月 11, 2018 5:36:38 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
12 WARN: HHH000402: Using Hibernate built-in connection pool (not for production use!)
13 六月 11, 2018 5:36:38 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
14 INFO: HHH000401: using driver [com.mysql.cj.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/ssh?serverTimezone=GMT&useSSL=false]
15 六月 11, 2018 5:36:38 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
16 INFO: HHH000046: Connection properties: {user=root, password=****}
17 六月 11, 2018 5:36:38 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
18 INFO: HHH000006: Autocommit mode: false
19 六月 11, 2018 5:36:38 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
20 INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
21 六月 11, 2018 5:36:39 下午 org.hibernate.dialect.Dialect <init>
22 INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLInnoDBDialect
23 六月 11, 2018 5:36:39 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
24 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
25 六月 11, 2018 5:36:39 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
26 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
27 六月 11, 2018 5:36:39 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
28 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
29 六月 11, 2018 5:36:39 下午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
30 INFO: HHH000228: Running hbm2ddl schema update
31 Hibernate: 
32     select
33         user0_.ID as ID1_0_0_,
34         user0_.NAME as NAME2_0_0_,
35         user0_.ADDRESS as ADDRESS3_0_0_ 
36     from
37         USER user0_ 
38     where
39         user0_.ID=?
40 User [id=2, name=YinRui, address=JangSu-NanJing]
41 Hibernate: 
42     select
43         user0_.ID as ID1_0_0_,
44         user0_.NAME as NAME2_0_0_,
45         user0_.ADDRESS as ADDRESS3_0_0_ 
46     from
47         USER user0_ 
48     where
49         user0_.ID=?
50 User [id=2, name=YinRui, address=JangSu-ChangZhou]
51 六月 11, 2018 5:36:39 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
52 INFO: HHH000030: Cleaning up connection pool [jdbc:mysql://localhost:3306/ssh?serverTimezone=GMT&useSSL=false]
控制台日志

数据库没有改变！

 1 package easyStart.Run;
 2 
 3 import org.hibernate.Session;
 4 import org.hibernate.SessionFactory;
 5 import org.hibernate.boot.MetadataSources;
 6 import org.hibernate.boot.registry.StandardServiceRegistry;
 7 import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
 8 
 9 import easyStart.Entity.User;
10 
11 public class QuickStart {
12 
13     public static void main(String[] args) {
14 
15         final StandardServiceRegistry registry = new StandardServiceRegistryBuilder().configure().build();
16         SessionFactory sessionFactory = null;
17         try {
18             sessionFactory = new MetadataSources(registry).buildMetadata().buildSessionFactory();
19         } catch (Exception e) {
20             StandardServiceRegistryBuilder.destroy(registry);
21         }
22 
23         Session session = sessionFactory.openSession();
24         session.beginTransaction();
25         // 处理事务 Begin
26         User user1 = session.get(User.class, 2);
27         System.out.println(user1);
28         
29         User user2 = session.get(User.class, 2);
30         System.out.println(user2);
31         // 处理事务 End
32         session.getTransaction().commit();
33         session.close();
34         sessionFactory.close();
35     }
36 
37 }
Java源码[缓存未被清空] 
 1 六月 11, 2018 5:44:50 下午 org.hibernate.Version logVersion
 2 INFO: HHH000412: Hibernate Core {5.0.1.Final}
 3 六月 11, 2018 5:44:50 下午 org.hibernate.cfg.Environment <clinit>
 4 INFO: HHH000206: hibernate.properties not found
 5 六月 11, 2018 5:44:50 下午 org.hibernate.cfg.Environment buildBytecodeProvider
 6 INFO: HHH000021: Bytecode provider name : javassist
 7 六月 11, 2018 5:44:50 下午 org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
 8 INFO: HCANN000001: Hibernate Commons Annotations {5.0.0.Final}
 9 六月 11, 2018 5:44:50 下午 org.hibernate.boot.jaxb.internal.stax.LocalXmlResourceResolver resolveEntity
10 WARN: HHH90000012: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/hibernate-mapping. Use namespace http://www.hibernate.org/dtd/hibernate-mapping instead.  Support for obsolete DTD/XSD namespaces may be removed at any time.
11 六月 11, 2018 5:44:51 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
12 WARN: HHH000402: Using Hibernate built-in connection pool (not for production use!)
13 六月 11, 2018 5:44:51 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
14 INFO: HHH000401: using driver [com.mysql.cj.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/ssh?serverTimezone=GMT&useSSL=false]
15 六月 11, 2018 5:44:51 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
16 INFO: HHH000046: Connection properties: {user=root, password=****}
17 六月 11, 2018 5:44:51 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
18 INFO: HHH000006: Autocommit mode: false
19 六月 11, 2018 5:44:51 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
20 INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
21 六月 11, 2018 5:44:51 下午 org.hibernate.dialect.Dialect <init>
22 INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLInnoDBDialect
23 六月 11, 2018 5:44:51 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
24 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
25 六月 11, 2018 5:44:51 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
26 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
27 六月 11, 2018 5:44:51 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
28 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
29 六月 11, 2018 5:44:52 下午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
30 INFO: HHH000228: Running hbm2ddl schema update
31 Hibernate: 
32     select
33         user0_.ID as ID1_0_0_,
34         user0_.NAME as NAME2_0_0_,
35         user0_.ADDRESS as ADDRESS3_0_0_ 
36     from
37         USER user0_ 
38     where
39         user0_.ID=?
40 User [id=2, name=YinRui, address=JangSu-ChangZhou]
41 User [id=2, name=YinRui, address=JangSu-ChangZhou]
42 六月 11, 2018 5:44:52 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
43 INFO: HHH000030: Cleaning up connection pool [jdbc:mysql://localhost:3306/ssh?serverTimezone=GMT&useSSL=false]
控制台日志[只有一条查询语句]

当执行clear函数后，缓存被清理了！再看结果：

 1 package easyStart.Run;
 2 
 3 import org.hibernate.Session;
 4 import org.hibernate.SessionFactory;
 5 import org.hibernate.boot.MetadataSources;
 6 import org.hibernate.boot.registry.StandardServiceRegistry;
 7 import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
 8 
 9 import easyStart.Entity.User;
10 
11 public class QuickStart {
12 
13     public static void main(String[] args) {
14 
15         final StandardServiceRegistry registry = new StandardServiceRegistryBuilder().configure().build();
16         SessionFactory sessionFactory = null;
17         try {
18             sessionFactory = new MetadataSources(registry).buildMetadata().buildSessionFactory();
19         } catch (Exception e) {
20             StandardServiceRegistryBuilder.destroy(registry);
21         }
22 
23         Session session = sessionFactory.openSession();
24         session.beginTransaction();
25         // 处理事务 Begin
26         User user1 = session.get(User.class, 2);
27         System.out.println(user1);
28         session.clear();// 清理缓存
29         User user2 = session.get(User.class, 2);
30         System.out.println(user2);
31         // 处理事务 End
32         session.getTransaction().commit();
33         session.close();
34         sessionFactory.close();
35     }
36 
37 }
Java源码[缓存被清空] 
 1 六月 11, 2018 5:47:09 下午 org.hibernate.Version logVersion
 2 INFO: HHH000412: Hibernate Core {5.0.1.Final}
 3 六月 11, 2018 5:47:09 下午 org.hibernate.cfg.Environment <clinit>
 4 INFO: HHH000206: hibernate.properties not found
 5 六月 11, 2018 5:47:09 下午 org.hibernate.cfg.Environment buildBytecodeProvider
 6 INFO: HHH000021: Bytecode provider name : javassist
 7 六月 11, 2018 5:47:09 下午 org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
 8 INFO: HCANN000001: Hibernate Commons Annotations {5.0.0.Final}
 9 六月 11, 2018 5:47:09 下午 org.hibernate.boot.jaxb.internal.stax.LocalXmlResourceResolver resolveEntity
10 WARN: HHH90000012: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/hibernate-mapping. Use namespace http://www.hibernate.org/dtd/hibernate-mapping instead.  Support for obsolete DTD/XSD namespaces may be removed at any time.
11 六月 11, 2018 5:47:10 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
12 WARN: HHH000402: Using Hibernate built-in connection pool (not for production use!)
13 六月 11, 2018 5:47:10 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
14 INFO: HHH000401: using driver [com.mysql.cj.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/ssh?serverTimezone=GMT&useSSL=false]
15 六月 11, 2018 5:47:10 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
16 INFO: HHH000046: Connection properties: {user=root, password=****}
17 六月 11, 2018 5:47:10 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
18 INFO: HHH000006: Autocommit mode: false
19 六月 11, 2018 5:47:10 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
20 INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
21 六月 11, 2018 5:47:10 下午 org.hibernate.dialect.Dialect <init>
22 INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLInnoDBDialect
23 六月 11, 2018 5:47:10 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
24 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
25 六月 11, 2018 5:47:10 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
26 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
27 六月 11, 2018 5:47:10 下午 org.hibernate.boot.model.source.internal.hbm.ModelBinder bindProperty
28 WARN: HHH90000003: Use of DOM4J entity-mode is considered deprecated
29 六月 11, 2018 5:47:11 下午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
30 INFO: HHH000228: Running hbm2ddl schema update
31 Hibernate: 
32     select
33         user0_.ID as ID1_0_0_,
34         user0_.NAME as NAME2_0_0_,
35         user0_.ADDRESS as ADDRESS3_0_0_ 
36     from
37         USER user0_ 
38     where
39         user0_.ID=?
40 User [id=2, name=YinRui, address=JangSu-ChangZhou]
41 Hibernate: 
42     select
43         user0_.ID as ID1_0_0_,
44         user0_.NAME as NAME2_0_0_,
45         user0_.ADDRESS as ADDRESS3_0_0_ 
46     from
47         USER user0_ 
48     where
49         user0_.ID=?
50 User [id=2, name=YinRui, address=JangSu-ChangZhou]
51 六月 11, 2018 5:47:11 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
52 INFO: HHH000030: Cleaning up connection pool [jdbc:mysql://localhost:3306/ssh?serverTimezone=GMT&useSSL=false]
控制台日志[多了一条查询语句]

证实了一点：session.clear();// 清理缓存 可以清空缓存内容！

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