Hibernate 使用注释
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Hibernate 使用注释
Hibernate使用注释有个好处就是我们不需要建立.hbm.xml文件,直接在实体类中添加注解就可以完成往数据库中进行数据操作
配置文件:hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- Database connection settings --> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost:3306/student?serverTimezone=UTC</property> <property name="connection.username">root</property> <property name="connection.password">123456</property> <!-- JDBC connection pool (use the built-in) --> <!-- <property name="connection.pool_size">1</property> --> <!-- SQL dialect 方言 MySQLDialect不同数据库不一样--> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <!-- Enable Hibernate‘s automatic session context management --> <!-- <property name="current_session_context_class">thread</property> --> <!-- Disable the second-level cache --> <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property> <!-- Echo all executed SQL to stdout 生产的sql打印出来--> <property name="show_sql">true</property> <!-- <mapping resource="com/xxc/model/Student.hbm.xml"></mapping> --> <mapping class="com.xxc.model.Teacher"></mapping> </session-factory> </hibernate-configuration>
实体类Teacher.java
package com.xxc.model; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.Table; @Entity @Table(name="teacher") public class Teacher { private int id; private String name; private String title; @Id 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 String getTitle() { return title; } public void setTitle(String title) { this.title = title; } }
操作类TeacherTest.java
在这里,我们使用StandardServiceRegistryBuilder
类和MetadataSources
类从持久化类获取映射的信息。
package hibernateTest; 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 com.xxc.model.Teacher; public class TeacherTest { public static void main(String[] args) { Teacher t = new Teacher(); t.setId(1); t.setName("xxc"); t.setTitle("高级"); final StandardServiceRegistry registry = new StandardServiceRegistryBuilder().configure("hibernate.cfg.xml").build(); SessionFactory sf = new MetadataSources(registry).buildMetadata().buildSessionFactory(); Session session = sf.openSession(); //开始事务 session.beginTransaction(); session.save(t); //结束事务 session.getTransaction().commit(); session.close(); sf.close(); } }
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