Hibernate使用JPA注解声明一个PO类
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这里写代码片开发步骤第一步:在hibernate.cfg.xml配置数据库连接和连接池<?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> <!-- 配置连接数据库 --> <property name="connection.username">root</property> <property name="connection.password">root</property> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql:///hibernate?useUnicode=true&characterEncoding=UTF-8</property> <!-- 配置方言是非常重要!!!我这里配置的为MySQL5Dialect --> <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property> <!-- 配置C3P0连接池 --> <property name="hibernate.c3p0.max_size">200</property> <property name="hibernate.c3p0.min_size">2</property> <property name="hibernate.c3p0.max_statements">50</property> <property name="hibernate.c3p0.timeout"></property> <property name="show_sql">true</property> <property name="format_sql">true</property> <property name="hbm2ddl.auto">update</property> <!-- 配置映射文件 --> <mapping class="cn.codekong.entity.Students"/> </session-factory></hibernate-configuration>第二步编写持久化类package cn.codekong.entity;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;import javax.persistence.Table;@Entity@Table(name="t_StuInfo")public class Students{ @Id @GeneratedValue(strategy=GenerationType.IDENTITY) private int sid; private String sname; private String gender; private String address; public Students() { } public Students(int sid, String sname, String gender, String address) { super(); this.sid = sid; this.sname = sname; this.gender = gender; this.address = address; } public int getSid() { return sid; } public void setSid(int sid) { this.sid = sid; } public String getSname() { return sname; } public void setSname(String sname) { this.sname = sname; } public String getGender() { return gender; } public void setGender(String gender) { this.gender = gender; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } @Override public String toString() { return "Students [sid=" + sid + ", sname=" + sname + ", gender=" + gender + ", address=" + address + "]"; }}第三步测试import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.boot.MetadataSources;import org.hibernate.boot.registry.StandardServiceRegistryBuilder;import org.hibernate.service.ServiceRegistry;import org.junit.After;import org.junit.Before;import org.junit.Test;import cn.codekong.entity.Students;public class StudentsTest { private SessionFactory sessionFactory; private Session session; private Transaction transaction; @Before public void init() { // 创建服务注册对象 ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().configure().build(); // 创建会话工厂对象 sessionFactory = new MetadataSources(serviceRegistry).buildMetadata().buildSessionFactory(); // 会话对象 session = sessionFactory.openSession(); // 开启事物 transaction = session.beginTransaction(); } @After public void destory() { // 提交事物 transaction.commit(); // 关闭会话 session.close(); // 关闭会话工厂 sessionFactory.close(); } @Test // 向数据库中添加数据 public void testSaveStudents() { // 生成学生对象 Students student = new Students(1, "小丽", "女", "成都"); System.out.println(student); session.save(student); System.out.println(session); }}结果:Hibernate: create table t_StuInfo ( sid integer not null auto_increment, address varchar(255), gender varchar(255), sname varchar(255), primary key (sid) ) engine=MyISAMStudents [sid=1, sname=小丽, gender=女, address=成都]Hibernate: insert into t_StuInfo (address, gender, sname) values (?, ?, ?)SessionImpl(PersistenceContext[entityKeys=[EntityKey[cn.codekong.entity.Students#1]],collectionKeys=[]];ActionQueue[insertions=ExecutableList{size=0} updates=ExecutableList{size=0} deletions=ExecutableList{size=0} orphanRemovals=ExecutableList{size=0} collectionCreations=ExecutableList{size=0} collectionRemovals=ExecutableList{size=0} collectionUpdates=ExecutableList{size=0} collectionQueuedOps=ExecutableList{size=0} unresolvedInsertDependencies=null])
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