Hibernate二级缓存配置
Posted 0A1
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了Hibernate二级缓存配置相关的知识,希望对你有一定的参考价值。
实体类
1 package cn.happy.entity; 2 3 public class Emp { 4 private Integer empNo; 5 private String empName; 6 public Integer getEmpNo() { 7 return empNo; 8 } 9 public void setEmpNo(Integer empNo) { 10 this.empNo = empNo; 11 } 12 public String getEmpName() { 13 return empName; 14 } 15 public void setEmpName(String empName) { 16 this.empName = empName; 17 } 18 19 20 21 }
工具类
1 package cn.happy.util; 2 3 import org.hibernate.Session; 4 import org.hibernate.SessionFactory; 5 import org.hibernate.cfg.Configuration; 6 7 public class HibernateUtil { 8 private static final ThreadLocal sessionTL=new ThreadLocal(); 9 private static Configuration cf; 10 private static final SessionFactory factory; 11 static{ 12 try { 13 cf=new Configuration().configure(); 14 factory=cf.buildSessionFactory(); 15 } catch (Exception e) { 16 throw new ExceptionInInitializerError(e); 17 } 18 } 19 public static Session getSession() 20 { 21 //sessionTL的get()方法根据当前线程返回其对应的线程内部变量, 22 //也就是我们需要的Session,多线程情况下共享数据库连接是不安全的。 23 //ThreadLocal保证了每个线程都有自己的Session。 24 Session session = (Session)sessionTL.get(); 25 //如果session为null,则打开一个新的session 26 if (session==null) { 27 //创建一个数据库连接对象session 28 session=factory.openSession(); 29 //保存该数据库连接session到ThreadLocal中。 30 sessionTL.set(session); 31 32 } 33 //如果当前线程已经访问过数据库了, 34 //则从sessionTL中get()就可以获取该线程上次获取过的数据库连接对象。 35 return session; 36 } 37 /** 38 * 关闭Session 39 */ 40 public static void closeSession() 41 { 42 Session session =(Session)sessionTL.get(); 43 sessionTL.set(null); 44 session.close(); 45 } 46 47 }
测试类
package cn.happy.test; import org.hibernate.Session; import org.hibernate.Transaction; import org.junit.Test; import cn.happy.entity.Emp; import cn.happy.util.HibernateUtil; public class STest { Transaction tx; Session session; Transaction tx2; Session session2; @Test public void testBulk(){ session = HibernateUtil.getSession(); tx=session.beginTransaction(); Emp emp = (Emp)session.get(Emp.class, 1); System.out.println(emp); tx.commit(); HibernateUtil.closeSession(); System.out.println("==================="); session2 = HibernateUtil.getSession(); tx2=session2.beginTransaction(); Emp emp2 = (Emp)session2.get(Emp.class, 1); System.out.println(emp2); tx2.commit(); HibernateUtil.closeSession(); } }
小配置
<?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.entity"> <class name="Emp" table="Emp"> <cache usage="read-write"/> <id name="empNo" type="int" column="EMPNO"> <generator class="native"> </generator> </id> <property name="empName" type="string" column="EMPNAME"/> </class> </hibernate-mapping>
大配置
<?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.OracleDriver</property> <property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property> <property name="connection.username">zc</property> <property name="connection.password">zc</property> <!-- 输出所有 SQL 语句到控制台。 --> <property name="hibernate.show_sql">true</property> <!-- 配置Hibernate.cfg.xml开启二级缓存。 --> <property name="hibernate.cache.use_second_level_cache">true</property> <!-- 配置二级缓存的供应商 --> <property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property> <!-- 在 log 和 console 中打印出更漂亮的 SQL。 --> <property name="hibernate.format_sql">true</property> <!-- 自动生成数据表,update/create --> <property name="hbm2ddl.auto">update</property> <!-- 方言 --> <property name="hibernate.dialect"> org.hibernate.dialect.Oracle10gDialect</property> <!-- 关联小配置 --> <mapping resource="cn/happy/entity/Emp.hbm.xml"/> <class-cache usage="read-write" class="cn.happy.entity.Emp"/> </session-factory> </hibernate-configuration>
Jar包导入
package cn.happy.entity;
public class Emp {private Integer empNo; private String empName;public Integer getEmpNo() {return empNo;}public void setEmpNo(Integer empNo) {this.empNo = empNo;}public String getEmpName() {return empName;}public void setEmpName(String empName) {this.empName = empName;}
}
以上是关于Hibernate二级缓存配置的主要内容,如果未能解决你的问题,请参考以下文章