Hibernate+EhCache配置二级缓存

时间  2019-11-11
标签 hibernate+ehcache hibernate ehcache 配置 二级 缓存 栏目 Hibernate 繁體版
原文   原文链接

Hibernate+EhCache配置二级缓存java

博客分类： Hibernate EhCacheHibernatecache二级缓存 blog迁移至 :http://www.micmiu.comsql

本文主要讲一讲hibernate+EhCache配置二级缓存的基本使用方法，主要分如下两个方面介绍：数据库

(有关EhCache的基础介绍可参见：http://sjsky.iteye.com/blog/1288257 ) Cache的多种配置方法 Hibernate+EhCache集成demo [一]、Cache的多种配置方法 Javabean cache的配置有三种，下面将一一介绍,具体以下：： (1).bean中注解配置的方式： @Cache(usage = CacheConcurrencyStrategy.READ_WRITE) (2).hibernate.cfg.xml中标签配置方式： <class-cache class="" usage="" /> (3).映射文件*.hb.xml中标签配置方式： <cache usage=" />c#

1. classpath:ehcahce.xml配置文件以下：

Xml代码 收藏代码缓存

<?xml version="1.0" encoding="UTF-8"?> session

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="ehcache.xsd" updateCheck="true" monitoring="autodetect" dynamicConfig="true">oracle

<diskStore path="java.io.tmpdir"/>  

<transactionManagerLookup class="net.sf.ehcache.transaction.manager.DefaultTransactionManagerLookup"  
                          properties="jndiName=java:/TransactionManager" propertySeparator=";"/>  

<cacheManagerEventListenerFactory class="" properties=""/>  

<defaultCache  
        maxElementsInMemory="100"  
        eternal="false"  
        timeToIdleSeconds="120"  
        timeToLiveSeconds="120"  
        overflowToDisk="true"  
        diskSpoolBufferSizeMB="30"  
        maxElementsOnDisk="100"  
        diskPersistent="false"  
        diskExpiryThreadIntervalSeconds="120"  
        memoryStoreEvictionPolicy="LRU"  
        statistics="false"  
        />  

<cache name="org.hibernate.cache.StandardQueryCache"  
    maxElementsInMemory="5"   
    eternal="false"   
    timeToLiveSeconds="120"  
    overflowToDisk="true" />  

<cache name="org.hibernate.cache.UpdateTimestampsCache"  
    maxElementsInMemory="5000"   
    eternal="true"   
    overflowToDisk="true" />  

<cache name="sampleCache1"  
       maxElementsInMemory="10000"  
       maxElementsOnDisk="1000"  
       eternal="false"  
       overflowToDisk="true"  
       diskSpoolBufferSizeMB="20"  
       timeToIdleSeconds="300"  
       timeToLiveSeconds="600"  
       memoryStoreEvictionPolicy="LFU"  
       transactionalMode="off"  
        />  

<cache name="sampleCache2"  
       maxElementsInMemory="1000"  
       eternal="true"  
       overflowToDisk="false"  
       memoryStoreEvictionPolicy="FIFO"  
        />

</ehcache> 2.hibernate配置文件：hibernate.cfg.xml Xml代码 收藏代码 <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> app

<hibernate-configuration> ide

<session-factory>  
    <property name="connection.driver_class">  
        oracle.jdbc.driver.OracleDriver  
    </property>  
    <property name="connection.url">  
        jdbc:oracle:thin:@localhost:1521:ora11g  
    </property>  
    <property name="connection.username">mytest</property>  
    <property name="connection.password">111111</property>  

    <property name="dialect">  
        org.hibernate.dialect.Oracle9Dialect  
    </property>  

    <property name="connection.useUnicode">true</property>  
    <property name="connection.characterEncoding">UTF-8</property>  
    <property name="connection.SetBigStringTryClob">true</property>  
    <property name="connection.pool_size">10</property>  
    <property name="hibernate.jdbc.batch_size">10</property>  


    <property name="show_sql">true</property>  
    <property name="format_sql">false</property>  
    <property name="current_session_context_class">thread</property>  
    <property name="hbm2ddl.auto">update</property>  
    <!--  Hibernate 3.3 and higher -->  
    <!--  
    <property name="hibernate.cache.region.factory_class">  
        net.sf.ehcache.hibernate.EhCacheRegionFactory  
    </property>  
    <property name="hibernate.cache.region.factory_class">  
        net.sf.ehcache.hibernate.SingletonEhCacheRegionFactory  
    </property>  
    -->  
    <!-- hibernate3.0-3.2 cache config-->  
    <!--   
    <property name="hibernate.cache.region.factory_class">  
        net.sf.ehcache.hibernate.EhCacheProvider  
    </property>  
    -->  
    <property name="hibernate.cache.provider_class">  
        net.sf.ehcache.hibernate.SingletonEhCacheProvider  
    </property>  
      
    <!-- Enable Second-Level Cache and Query Cache Settings -->  
    <property name="hibernate.cache.use_second_level_cache">  
        true  
    </property>  
    <property name="hibernate.cache.use_query_cache">  
        true  
    </property>  

    <!-- 注解配置  -->  
    <mapping class="michael.cache.ehcache.hibernate.EhUserInfo" />  
    <mapping class="michael.cache.ehcache.hibernate.EhBlogTopic" />  
    <mapping class="michael.cache.ehcache.hibernate.EhBlogTopic2" />  

    <!-- 映射文件 -->  
    <mapping  
        resource="michael/cache/ehcache/hibernate/tb_EhBlogTopic3.hb.xml" />  

    <!-- class-cache config -->  
    <class-cache class="michael.cache.ehcache.hibernate.EhBlogTopic"  
        usage="read-write" />  

</session-factory>

</hibernate-configuration> 3.相关javabean代码片断以下： (1).hibernate.cfg.xml中<calss-cache>标签配置的：EhBlogTopic.Java: Java代码 收藏代码 /** * @blog http://sjsky.iteye.com * @author Michael */ @Entity @Table(name = "MY_TB_EH_BLOG_TOPIC") public class EhBlogTopic implements Serializable { 测试

/** 
 * serialVersionUID 
 */  
private static final long serialVersionUID = -570936907944909799L;  

private Integer id;  

private String userId;  

private String topic;  

private String site;  

//其余省略

}
(2). bean中注解的方式配置cache的：EhBlogTopic2.java Java代码 收藏代码 /**

  • @blog http://sjsky.iteye.com
  • @author Michael /
    @Entity
    @Table(name = "MY_TB_EH_BLOG_TOPIC2")
    @Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
    public class EhBlogTopic2 implements Serializable {
    //属性和EhBlogTopic同样
    //其余省略
    }
    (3). 映射文件    .hb.xml中添加cache标签的： EhBlogTopic3.java Java代码 收藏代码 /**
  • @blog http://sjsky.iteye.com
  • @author Michael */
    public class EhBlogTopic3 implements Serializable {
    //属性和EhBlogTopic同样
    //其余省略
    }
    tb_EhBlogTopic3.hb.xml Xml代码 收藏代码

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="michael.cache.ehcache.hibernate"> 

<class name="EhBlogTopic3" table="MY_TB_EH_BLOG_TOPIC3">  
    <cache usage="read-write" />  
    <id name="id" type="int" unsaved-value="null">  
        <generator class="increment" />  
    </id>  
    <property name="userId" column="USER_ID" type="string"  
        not-null="false" length="20" />  

    <property name="topic" column="TOPIC" type="string"  
        not-null="false" length="100" />  
    <property name="site" column="SITE" type="string"  
        not-null="false" length="100" />  

</class>

</hibernate-mapping> (4). 没有配置cache的bean:EhUserInfo.java Java代码 收藏代码 /** * @blog http://sjsky.iteye.com * @author Michael */ @Entity @Table(name = "MY_TB_EH_USER_INFO") public class EhUserInfo implements Serializable { 

/** 
 * serialVersionUID 
 */  
private static final long serialVersionUID = 930384253681679239L;  

private Integer id;  

private String userId;  

private String userName;  

private String otherInfo;  

/** 
 * @return the id 
 */  
@Id  
@GeneratedValue  
@Column(name = "ID")  
public Integer getId() {  
    return id;  
}

//其余省略。。。

}

4.测试运行代码以下：

Java代码 收藏代码 package michael.cache.ehcache.hibernate;

import java.util.List;

import michael.hibernate.bigstring.oracle.BigStrBlob;
import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;

/** *

  • @blog http://sjsky.iteye.com

  • @author Michael */
    public class TestEhcacheHibernate {

    /**

    • @param args */
      @SuppressWarnings("unchecked")
      public static void main(String[] args) {
      testMulitConfigMethod();
      }

    /**

    • 测试多种配置缓存的方法 */
      public static void testMulitConfigMethod() {
      SessionFactory sessionFactory = null;
      try {
      System.out.println("ehcache - hibernate Test ...");
      Configuration config = new AnnotationConfiguration()
      .configure("michael/cache/ehcache/hibernate/hibernate.cfg.xml");
      System.out.println("hibernate config successful :" + config);
      sessionFactory = config.buildSessionFactory();
      Transaction ta = null;
      try {
      Session session = sessionFactory.getCurrentSession();
      ta = session.beginTransaction();
      } catch (Exception e) {
      e.printStackTrace();
      ta.rollback();
      }
      String[] cacheNames = CacheManager.getInstance().getCacheNames();
      System.out.println("缓存的key cacheNames length := "
      + cacheNames.length + " 具体详细列表以下：");
      for (String name : cacheNames) {
      System.out.println("name := " + name);
      }
      } catch (Exception e) {
      e.printStackTrace();
      }
      System.out.println("ehcache - hibernate Test end.");
      }
      }
      运行结果以下：

ehcache - hibernate Test ... hibernate config successful :org.hibernate.cfg.AnnotationConfiguration@193c0cf 2011-12-15 11:32:36 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache 警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic]; using defaults. 2011-12-15 11:32:36 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache 警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic2]; using defaults. 2011-12-15 11:32:36 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache 警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic3]; using defaults. 2011-12-15 11:32:37 net.sf.ehcache.util.UpdateChecker doCheck 信息: New update(s) found: 2.4.6 [http://www.terracotta.org/confluence/display/release/Release+Notes+Ehcache+Core+2.4]. Please check http://ehcache.org for the latest version. 缓存的key cacheNames length := 7 具体详细列表以下： name := sampleCache2 name := michael.cache.ehcache.hibernate.EhBlogTopic2 name := org.hibernate.cache.UpdateTimestampsCache name := sampleCache1 name := michael.cache.ehcache.hibernate.EhBlogTopic name := org.hibernate.cache.StandardQueryCache name := michael.cache.ehcache.hibernate.EhBlogTopic3 ehcache - hibernate Test end. 从运行结果可见：三种方式的缓存配置都已经成功。

[二]、Hibernate+EhCache集成demo 1.分别初始化EhUserInfo（没有配置cache的）和EhBlogTopic（配置过cache的）数据以下： EhUserInfo：

EhBlogTopic：

2.演示代码： Java代码 收藏代码 package michael.cache.ehcache.hibernate;

import java.util.List;

import michael.hibernate.bigstring.oracle.BigStrBlob;
import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;

/** *

  • @blog http://sjsky.iteye.com

  • @author Michael */
    public class TestEhcacheHibernate {

    /**

    • @param args */
      @SuppressWarnings("unchecked")
      public static void main(String[] args) {
      SessionFactory sessionFactory = null;
      try {
      System.out.println("ehcache - hibernate Test ...");
      Configuration config = new AnnotationConfiguration()
      .configure("michael/cache/ehcache/hibernate/hibernate.cfg.xml");

      sessionFactory = config.buildSessionFactory();  
 System.out.println("buildSessionFactory===============");  

 System.out.println("====================================");  
 System.out.println("session open ....");  
 System.out.println("同一个session(一级缓存默认的)中，没有配置cache的Bean");  
 Transaction ta = null;  
 try {  
     Session session = sessionFactory.getCurrentSession();  
     String hsql = "select t from EhUserInfo t ";  
     ta = session.beginTransaction();  
     Query query = session.createQuery(hsql);  
     System.out.println("查询所有query.list().size:"  
             + query.list().size());  

     System.out.println("再根据ID=1查询某记录时不会再去查数据库,故不会打印hsql");  
     EhUserInfo vo1 = (EhUserInfo) session.get(EhUserInfo.class, 1);  
     System.out.println("根据ID=1找到的记录:" + vo1);  
     ta.commit();  
 } catch (Exception e) {  
     e.printStackTrace();  
     ta.rollback();  
 }  
 System.out.println("session closed.");  

 System.out.println("session open ....");  
 try {  
     Session session = sessionFactory.getCurrentSession();  
     ta = session.beginTransaction();  
     System.out.println("第一次根据ID=1查询某记录时,会打印hsql");  
     EhUserInfo vo1 = (EhUserInfo) session.get(EhUserInfo.class, 1);  
     System.out.println("根据ID=1找到的记录:" + vo1);  
     ta.commit();  
 } catch (Exception e) {  
     e.printStackTrace();  
     ta.rollback();  
 }  
 System.out.println("session closed.");  

 System.out.println("====================================");  
 System.out.println("当前同一个sessionFactory，没有配置cache的Bean,");  
 System.out.println("session open ....");  
 try {  
     Session session = sessionFactory.getCurrentSession();  
     ta = session.beginTransaction();  
     System.out.println("第一次根据ID=1查询记录时会再去查数据库,故打印hsql以下：");  
     EhUserInfo vo1 = (EhUserInfo) session.get(EhUserInfo.class, 1);  
     System.out.println("根据ID=1找到的记录:" + vo1);  
     ta.commit();  
 } catch (Exception e) {  
     e.printStackTrace();  
     ta.rollback();  
 }  
 System.out.println("session closed.");  
 System.out.println("====================================");  
 String[] cacheNames = CacheManager.getInstance().getCacheNames();  
 System.out.println("缓存的key cacheNames length := "  
         + cacheNames.length);  
 for (String name : cacheNames) {  
     System.out.println("name := " + name);  
 }  

 System.out.println("====================================");  
 System.out.println("同一个session(一级缓存默认的)中，配置cache的Bean");  

 System.out.println("session open ....");  
 try {  
     Session session = sessionFactory.getCurrentSession();  
     String hsql = "select t from EhBlogTopic t ";  
     ta = session.beginTransaction();  
     Query query = session.createQuery(hsql);  
     query.setCacheable(true);  
     System.out.println("查询所有query.list().size:"  
             + query.list().size());  

     Cache myCache1 = CacheManager.getInstance().getCache(  
             "michael.cache.ehcache.hibernate.EhBlogTopic");  
     System.out.println("查询到EhBlogTopic cache size:"  
             + myCache1.getKeys().size());  
     myCache1 = CacheManager.getInstance().getCache(  
             "michael.cache.ehcache.hibernate.EhBlogTopic");  
     System.out.println("EhBlogTopic cache size:"  
             + myCache1.getKeys().size() + ",详细记录以下：");  
     for (Object str : myCache1.getKeys()) {  
         System.out.println(str);  
     }  

     System.out  
             .println("在同一个session，再根据ID=1查询记录时不会再去查数据库,故不会打印hsql");  
     EhBlogTopic vo1 = (EhBlogTopic) session.get(EhBlogTopic.class,  
             1);  
     System.out.println("根据ID=1找到的记录:" + vo1);  
     EhBlogTopic vo2 = new EhBlogTopic();  
     vo2.setId(10);  
     vo2.setUserId("michael");  
     vo2.setTopic("Myblog:11");  
     vo2.setSite("http://sjsky.iteye.com");  
     session.save(vo2);  
     ta.commit();  
     System.out.println("新增长一条记录ID=10");  
 } catch (Exception e) {  
     e.printStackTrace();  
     ta.rollback();  
 }  
 System.out.println("session closed.");  

 System.out.println("====================================");  
 Cache myCache1 = CacheManager.getInstance().getCache(  
         "michael.cache.ehcache.hibernate.EhBlogTopic");  
 System.out.println("EhBlogTopic cache size:"  
         + myCache1.getKeys().size() + ",详细记录以下：");  
 for (Object str : myCache1.getKeys()) {  
     System.out.println(str);  
 }  

 System.out.println("====================================");  
 System.out.println("在当前同一个sessionFactory，配置cache的bean");  
 System.out.println("session open ....");  
 try {  
     Session session = sessionFactory.getCurrentSession();  
     ta = session.beginTransaction();  
     System.out  
             .println("无论是否第一次查询ID=1的记录，若是cache中存在的，则不会再查数据库,故不打印hsql");  
     EhBlogTopic vo1 = (EhBlogTopic) session.get(EhBlogTopic.class,  
             1);  
     System.out.println("根据ID=1找到的记录:" + vo1);  
     System.out.println("查询以前session保存的数据ID=10，也不会再查数据库,故不打印hsql");  
     EhBlogTopic vo2 = (EhBlogTopic) session.get(EhBlogTopic.class,  
             10);  
     System.out.println("根据以前save的ID=10找到的记录:" + vo2);  
     ta.commit();  
 } catch (Exception e) {  
     e.printStackTrace();  
     ta.rollback();  
 }  
 System.out.println("session closed.");

      } catch (Exception e) {
      e.printStackTrace();
      } finally {
      if (null != sessionFactory) {
      sessionFactory.close();

      }

      }
      System.out.println("sessionFactory closed.");
      }
      }

运行结果以下：

ehcache - hibernate Test ... 2011-12-15 13:27:15 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache 警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic]; using defaults. 2011-12-15 13:27:15 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache 警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic2]; using defaults. 2011-12-15 13:27:15 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache 警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic3]; using defaults. buildSessionFactory===============

session open .... 同一个session(一级缓存默认的)中，没有配置cache的Bean Hibernate: select ehuserinfo0_.ID as ID1_, ehuserinfo0_.USER_ID as USER2_1_, ehuserinfo0_.USER_NAME as USER3_1_, ehuserinfo0_.OHTER_INFO as OHTER4_1_ from MY_TB_EH_USER_INFO ehuserinfo0_ 查询所有query.list().size:2 再根据ID=1查询某记录时不会再去查数据库,故不会打印hsql 根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhUserInfo@63b2e6 session closed. session open .... 第一次根据ID=1查询某记录时,会打印hsql Hibernate: select ehuserinfo0_.ID as ID1_0_, ehuserinfo0_.USER_ID as USER2_1_0_, ehuserinfo0_.USER_NAME as USER3_1_0_, ehuserinfo0_.OHTER_INFO as OHTER4_1_0_ from MY_TB_EH_USER_INFO ehuserinfo0_ where ehuserinfo0_.ID=? 根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhUserInfo@123a389 session closed.

当前同一个sessionFactory，没有配置cache的Bean, session open .... 第一次根据ID=1查询记录时会再去查数据库,故打印hsql以下： Hibernate: select ehuserinfo0_.ID as ID1_0_, ehuserinfo0_.USER_ID as USER2_1_0_, ehuserinfo0_.USER_NAME as USER3_1_0_, ehuserinfo0_.OHTER_INFO as OHTER4_1_0_ from MY_TB_EH_USER_INFO ehuserinfo0_ where ehuserinfo0_.ID=? 根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhUserInfo@429c19 session closed.

缓存的key cacheNames length := 7 name := sampleCache2 name := michael.cache.ehcache.hibernate.EhBlogTopic2 name := org.hibernate.cache.UpdateTimestampsCache name := sampleCache1 name := michael.cache.ehcache.hibernate.EhBlogTopic name := org.hibernate.cache.StandardQueryCache name := michael.cache.ehcache.hibernate.EhBlogTopic3

同一个session(一级缓存默认的)中，配置cache的Bean session open .... Hibernate: select ehblogtopi0_.ID as ID2_, ehblogtopi0_.USER_ID as USER2_2_, ehblogtopi0_.TOPIC as TOPIC2_, ehblogtopi0_.SITE as SITE2_ from MY_TB_EH_BLOG_TOPIC ehblogtopi0_ 查询所有query.list().size:9 查询到EhBlogTopic cache size:9 EhBlogTopic cache size:9,详细记录以下： michael.cache.ehcache.hibernate.EhBlogTopic#6 michael.cache.ehcache.hibernate.EhBlogTopic#5 michael.cache.ehcache.hibernate.EhBlogTopic#7 michael.cache.ehcache.hibernate.EhBlogTopic#8 michael.cache.ehcache.hibernate.EhBlogTopic#2 michael.cache.ehcache.hibernate.EhBlogTopic#9 michael.cache.ehcache.hibernate.EhBlogTopic#1 michael.cache.ehcache.hibernate.EhBlogTopic#4 michael.cache.ehcache.hibernate.EhBlogTopic#3 在同一个session，再根据ID=1查询记录时不会再去查数据库,故不会打印hsql 根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhBlogTopic@11a0d35 Hibernate: insert into MY_TB_EH_BLOG_TOPIC (USER_ID, TOPIC, SITE, ID) values (?, ?, ?, ?) 新增长一条记录ID=10 session closed.

EhBlogTopic cache size:10,详细记录以下： michael.cache.ehcache.hibernate.EhBlogTopic#6 michael.cache.ehcache.hibernate.EhBlogTopic#5 michael.cache.ehcache.hibernate.EhBlogTopic#7 michael.cache.ehcache.hibernate.EhBlogTopic#8 michael.cache.ehcache.hibernate.EhBlogTopic#2 michael.cache.ehcache.hibernate.EhBlogTopic#9 michael.cache.ehcache.hibernate.EhBlogTopic#10 michael.cache.ehcache.hibernate.EhBlogTopic#1 michael.cache.ehcache.hibernate.EhBlogTopic#4 michael.cache.ehcache.hibernate.EhBlogTopic#3

在当前同一个sessionFactory，配置cache的bean session open .... 无论是否第一次查询ID=1的记录，若是cache中存在的，则不会再查数据库,故不打印hsql 根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhBlogTopic@1321f5 查询以前session保存的数据ID=10，也不会再查数据库,故不打印hsql 根据以前save的ID=10找到的记录:michael.cache.ehcache.hibernate.EhBlogTopic@1a6518 session closed. sessionFactory closed.

相关文章
相关标签/搜索
每日一句
    每一个你不满意的现在，都有一个你没有努力的曾经。
本站公众号
   欢迎关注本站公众号,获取更多信息
联系我们 最近搜索 最新文章 沪ICP备13005482号-10 MyBatis教程 SQL 教程 MySQL教程 Java 教程 Thymeleaf 教程 Hibernate教程 Spring教程 Redis教程