1.新建一个工具类
2.编写代码
package cn.happy.day01.util;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
/**
* Created by CY on 2017/12/23.
*/
public class HibernateUtil {
private static ThreadLocal<Session> tl=new ThreadLocal<Session>();
private static Configuration cfg;
private static SessionFactory sessionFactory;
static {
cfg=new Configuration().configure();
sessionFactory=cfg.buildSessionFactory();
}
public static Session getSession(){
Session session=tl.get();
if(session==null){
session = sessionFactory.openSession();
tl.set(session);
}
return session;
}
public static void closeSession(){
Session session = (Session) tl.get();
tl.set(null);
session.close();
}
}
注意这里使用的是openSession();
3.大配置小配置:不用解了
<?xml version=‘1.0‘ encoding=‘utf-8‘?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<!---->
<session-factory>
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
<property name="connection.username">happy</property>
<property name="connection.password">happy</property>
<!--sql 方言-->
<property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>
<!--连接池-->
<!--<property name="connection.pool_size">1</property>-->
<!--和当前线程绑定-->
<property name="current_session_context_class">thread</property>
<!--echo 打印控制台语句 shout-->
<property name="show_sql">true</property>
<!--格式化代码-->
<property name="format_sql">true</property>
<!--自动更新表结构 createe 先delete表结构 在创建 update直接更新表结构-->
<property name="hbm2ddl.auto">update</property>
<mapping resource="cn/happy/day01/entity/Dog.hbm.xml" />
<mapping resource="cn/happy/day01/entity/Student.hbm.xml" />
</session-factory>
</hibernate-configuration>
@Entity
public class Student {
private Integer sid;
private String sname;
private Integer sage;
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.happy.day01.entity">
<class name="Student" table="STUDENT" schema="happy">
<id name="sid" column="sid">
<!-- native 数据库方言的可移植性 -->
<generator class="native"/>
</id>
<property name="sname" column="sname" />
<property name="sage" column="sage"/>
</class>
</hibernate-mapping>
4.数据库使用的是Oracle
/*
Navicat Oracle Data Transfer
Oracle Client Version : 11.2.0.1.0
Source Server : happy
Source Server Version : 110200
Source Host : localhost:1521
Source Schema : HAPPY
Target Server Type : ORACLE
Target Server Version : 110200
File Encoding : 65001
Date: 2017-12-24 22:31:33
*/
-- ----------------------------
-- Table structure for STUDENT
-- ----------------------------
DROP TABLE "HAPPY"."STUDENT";
CREATE TABLE "HAPPY"."STUDENT" (
"SID" NUMBER(10) NOT NULL ,
"SNAME" VARCHAR2(255 CHAR) NULL ,
"SAGE" NUMBER(10) NULL
)
LOGGING
NOCOMPRESS
NOCACHE
;
-- ----------------------------
-- Records of STUDENT
-- ----------------------------
INSERT INTO "HAPPY"."STUDENT" VALUES (‘4‘, ‘小红‘, ‘12‘);
-- ----------------------------
-- Indexes structure for table STUDENT
-- ----------------------------
-- ----------------------------
-- Checks structure for table STUDENT
-- ----------------------------
ALTER TABLE "HAPPY"."STUDENT" ADD CHECK ("SID" IS NOT NULL);
-- ----------------------------
-- Primary Key structure for table STUDENT
-- ----------------------------
ALTER TABLE "HAPPY"."STUDENT" ADD PRIMARY KEY ("SID");
5.使用的jar包
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<parent>
<artifactId>Y2166</artifactId>
<groupId>cn.happy</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>hibernate</artifactId>
<packaging>war</packaging>
<name>hibernate Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.3</version>
<scope>test</scope>
</dependency>
<!--oracle jdbc-->
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.1.0</version>
</dependency>
<!--hibernate核心jar-->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.0.6.Final</version>
</dependency>
<!--oracle 事务-->
<dependency>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
<version>1.1</version>
</dependency>
<!--mysql数据库驱动-->
<dependency>
<groupId>org.wisdom-framework</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.34_1</version>
</dependency>
</dependencies>
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.*</include>
</includes>
</resource>
</resources>
</build>
</project>
6.测试类
数据库修改前:
测试修改
package day02hql;
import cn.happy.day01.entity.Student;
import cn.happy.day01.util.HibernateUtil;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.util.List;
/**
* 脏检查和缓存机制探讨
*/
public class mytest20171224_02 {
Configuration cfg;
SessionFactory factory;
Session session;
Transaction tx;
@Before
public void before(){
cfg=new Configuration().configure();
factory=cfg.buildSessionFactory();
session=factory.getCurrentSession();
tx=session.beginTransaction();
}
@Test
public void t1(){
//使用update更新数据
Student student = session.load(Student.class, 4);
student.setSname("小贱贱");
session.update(student);
tx.commit();
//在数据同步情况下更新数据
Student student1 = HibernateUtil.getSession().load(Student.class, 4);
student1.setSname("小军");
HibernateUtil.closeSession();
}
}
数据库运行后
运行结果:
可以看到数据库确实是更新了
但是控制台却打印出来两条查询语句
E:\jdk\bin\java -ea -Didea.launcher.port=7535 "-Didea.launcher.bin.path=E:\ideat\IntelliJ IDEA 2016.3.2\bin" -Dfile.encoding=UTF-8 -classpath "E:\ideat\IntelliJ IDEA 2016.3.2\lib\idea_rt.jar;E:\ideat\IntelliJ IDEA 2016.3.2\plugins\junit\lib\junit-rt.jar;E:\jdk\jre\lib\charsets.jar;E:\jdk\jre\lib\deploy.jar;E:\jdk\jre\lib\ext\access-bridge-32.jar;E:\jdk\jre\lib\ext\cldrdata.jar;E:\jdk\jre\lib\ext\dnsns.jar;E:\jdk\jre\lib\ext\jaccess.jar;E:\jdk\jre\lib\ext\jfxrt.jar;E:\jdk\jre\lib\ext\localedata.jar;E:\jdk\jre\lib\ext\nashorn.jar;E:\jdk\jre\lib\ext\sunec.jar;E:\jdk\jre\lib\ext\sunjce_provider.jar;E:\jdk\jre\lib\ext\sunmscapi.jar;E:\jdk\jre\lib\ext\sunpkcs11.jar;E:\jdk\jre\lib\ext\zipfs.jar;E:\jdk\jre\lib\javaws.jar;E:\jdk\jre\lib\jce.jar;E:\jdk\jre\lib\jfr.jar;E:\jdk\jre\lib\jfxswt.jar;E:\jdk\jre\lib\jsse.jar;E:\jdk\jre\lib\management-agent.jar;E:\jdk\jre\lib\plugin.jar;E:\jdk\jre\lib\resources.jar;E:\jdk\jre\lib\rt.jar;E:\Y2166\hibernate\target\test-classes;E:\Y2166\hibernate\target\classes;E:\mavon\repository\junit\junit\4.3\junit-4.3.jar;E:\mavon\repository\com\oracle\ojdbc6\11.2.0.1.0\ojdbc6-11.2.0.1.0.jar;E:\mavon\repository\org\hibernate\hibernate-core\5.0.6.Final\hibernate-core-5.0.6.Final.jar;E:\mavon\repository\org\jboss\logging\jboss-logging\3.3.0.Final\jboss-logging-3.3.0.Final.jar;E:\mavon\repository\org\hibernate\javax\persistence\hibernate-jpa-2.1-api\1.0.0.Final\hibernate-jpa-2.1-api-1.0.0.Final.jar;E:\mavon\repository\org\javassist\javassist\3.18.1-GA\javassist-3.18.1-GA.jar;E:\mavon\repository\antlr\antlr\2.7.7\antlr-2.7.7.jar;E:\mavon\repository\org\jboss\jandex\2.0.0.Final\jandex-2.0.0.Final.jar;E:\mavon\repository\dom4j\dom4j\1.6.1\dom4j-1.6.1.jar;E:\mavon\repository\xml-apis\xml-apis\1.0.b2\xml-apis-1.0.b2.jar;E:\mavon\repository\org\hibernate\common\hibernate-commons-annotations\5.0.1.Final\hibernate-commons-annotations-5.0.1.Final.jar;E:\mavon\repository\javax\transaction\jta\1.1\jta-1.1.jar;E:\mavon\repository\org\wisdom-framework\mysql-connector-java\5.1.34_1\mysql-connector-java-5.1.34_1.jar;E:\mavon\repository\org\apache\felix\org.apache.felix.ipojo.annotations\1.12.1\org.apache.felix.ipojo.annotations-1.12.1.jar;E:\mavon\repository\org\wisdom-framework\abstract-jdbc-driver\0.5\abstract-jdbc-driver-0.5.jar" com.intellij.rt.execution.application.AppMain com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 day02hql.mytest20171224_02,t1
十二月 24, 2017 10:36:14 下午 org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.0.6.Final}
十二月 24, 2017 10:36:14 下午 org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
十二月 24, 2017 10:36:14 下午 org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
十二月 24, 2017 10:36:14 下午 org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
十二月 24, 2017 10:36:15 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
十二月 24, 2017 10:36:15 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001005: using driver [oracle.jdbc.driver.OracleDriver] at URL [jdbc:oracle:thin:@localhost:1521:orcl]
十二月 24, 2017 10:36:15 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001001: Connection properties: {user=happy, password=****}
十二月 24, 2017 10:36:15 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001003: Autocommit mode: false
十二月 24, 2017 10:36:15 下午 org.hibernate.engine.jdbc.connections.internal.PooledConnections <init>
INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
十二月 24, 2017 10:36:16 下午 org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.Oracle10gDialect
十二月 24, 2017 10:36:16 下午 org.hibernate.id.UUIDHexGenerator <init>
WARN: HHH000409: Using org.hibernate.id.UUIDHexGenerator which does not generate IETF RFC 4122 compliant UUID values; consider using org.hibernate.id.UUIDGenerator instead
十二月 24, 2017 10:36:17 下午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000228: Running hbm2ddl schema update
Hibernate:
select
student0_.sid as sid1_1_0_,
student0_.sname as sname2_1_0_,
student0_.sage as sage3_1_0_
from
happy.STUDENT student0_
where
student0_.sid=?
十二月 24, 2017 10:36:18 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
十二月 24, 2017 10:36:18 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001005: using driver [oracle.jdbc.driver.OracleDriver] at URL [jdbc:oracle:thin:@localhost:1521:orcl]
十二月 24, 2017 10:36:18 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001001: Connection properties: {user=happy, password=****}
十二月 24, 2017 10:36:18 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001003: Autocommit mode: false
十二月 24, 2017 10:36:18 下午 org.hibernate.engine.jdbc.connections.internal.PooledConnections <init>
INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
十二月 24, 2017 10:36:18 下午 org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.Oracle10gDialect
十二月 24, 2017 10:36:18 下午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000228: Running hbm2ddl schema update
Hibernate:
select
student0_.sid as sid1_1_0_,
student0_.sname as sname2_1_0_,
student0_.sage as sage3_1_0_
from
happy.STUDENT student0_
where
student0_.sid=?
Process finished with exit code 0
?待讨论
时间： 2024-10-14 07:47:39