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hibernate_02_session介绍
写一个java类
1 package com.imooc.hibernate; 2 3 import java.util.Date; 4 5 public class Students { 6 7 private int sid; 8 private String sname; 9 private String gender; 10 private Date birthday; 11 private String address; 12 13 public Students(int sid, String sname, String gender, Date birthday, String address) { 14 super(); 15 this.sid = sid; 16 this.sname = sname; 17 this.gender = gender; 18 this.birthday = birthday; 19 this.address = address; 20 } 21 22 @Override 23 public String toString() { 24 return "Students [sid=" + sid + ", sname=" + sname + ", gender=" + gender + ", birthday=" + birthday 25 + ", address=" + address + "]"; 26 } 27 28 public int getSid() { 29 return sid; 30 } 31 32 public void setSid(int sid) { 33 this.sid = sid; 34 } 35 36 public String getSname() { 37 return sname; 38 } 39 40 public void setSname(String sname) { 41 this.sname = sname; 42 } 43 44 public String getGender() { 45 return gender; 46 } 47 48 public void setGender(String gender) { 49 this.gender = gender; 50 } 51 52 public Date getBirthday() { 53 return birthday; 54 } 55 56 public void setBirthday(Date birthday) { 57 this.birthday = birthday; 58 } 59 60 public String getAddress() { 61 return address; 62 } 63 64 public void setAddress(String address) { 65 this.address = address; 66 } 67 }
生成类的配置文件
<?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <!-- Generated 2017-5-23 0:24:09 by Hibernate Tools 3.5.0.Final --> <hibernate-mapping> <class name="com.imooc.hibernate.Students" table="STUDENTS"> <id name="sid" type="int"> <column name="SID" /> <generator class="assigned" /> </id> <property name="sname" type="java.lang.String"> <column name="SNAME" /> </property> <property name="gender" type="java.lang.String"> <column name="GENDER" /> </property> <property name="birthday" type="java.util.Date"> <column name="BIRTHDAY" /> </property> <property name="address" type="java.lang.String"> <column name="ADDRESS" /> </property> </class> </hibernate-mapping>
配置hibernate.cfg.xml文件
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE hibernate-configuration PUBLIC 3 "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 4 "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> 5 <hibernate-configuration> 6 <session-factory> 7 <property name="connection.username">root</property> 8 <property name="connection.password">root</property> 9 <property name="connection.driver_class">com.mysql.jdbc.Driver</property> 10 <property name="connection.url">jdbc:mysql://localhost:3306/hibernate?useUnicode=true&characterEncoding=UTF-8</property> 11 <property name="dialect">org.hibernate.dialect.MySQLDialect</property> 12 <!-- 是否将sql语句打印到控制台,编码阶段便于测试,建议设为true --> 13 <property name="show_sql">true</property> 14 <!-- 是否将sql语句进行排版,建议设为true --> 15 <property name="format_sql">true</property> 16 <!-- 生成表结构的策略。create是如果之前有表结构,先删除表结构再重建; 17 update:原有的基础上更新; 18 create-drop:先删除表结构再重建 19 validate:与原表进行验证,如果和原表表结构不同,则不进行创建。 20 一般使用create和update 21 --> 22 <property name="hbm2ddl.auto">create</property> 23 24 <mapping resource="com/imooc/hibernate/Students.hbm.xml"/> 25 </session-factory> 26 </hibernate-configuration>
如果不使用事务,hibernate不会在数据库生成相应的数据。当然,即使不使用事务,也不是没办法写入数据库。方法如下:
1 package com.icoom.test; 2 import static org.junit.Assert.fail; 3 4 import java.sql.Connection; 5 import java.sql.SQLException; 6 import java.util.Date; 7 8 import org.hibernate.Session; 9 import org.hibernate.SessionFactory; 10 import org.hibernate.Transaction; 11 import org.hibernate.cfg.Configuration; 12 import org.hibernate.jdbc.Work; 13 import org.hibernate.service.ServiceRegistry; 14 import org.hibernate.service.ServiceRegistryBuilder; 15 import org.junit.After; 16 import org.junit.Before; 17 import org.junit.Test; 18 19 import com.imooc.hibernate.Students; 20 21 public class StudentsTest { 22 23 private SessionFactory sessionFactory; 24 private Session session; 25 private Transaction transaction; 26 27 @Before 28 public void init() { 29 // 1.创建配置对象 30 Configuration config = new Configuration().configure(); 31 // 2.创建服务注册对象 32 ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry(); 33 // 3.创建会话工厂对象 34 sessionFactory = config.buildSessionFactory(serviceRegistry); 35 // 会话对象 36 session = sessionFactory.openSession(); 37 // 开启事务(注意:不开启事物就不能将对象保存在数据库中) 38 // transaction = session.beginTransaction(); 39 } 40 @After 41 public void destory() { 42 // transaction.commit(); 43 session.close(); 44 sessionFactory.close(); 45 } 46 @Test 47 public void testSaveStudents() { 48 // 生成学生对象 49 Students s = new Students(1, "老张", "男", new Date(), "山东"); 50 //如果不使用事务,又想将数据像jdbc一样自动提交到数据库中,可以使用session.doWork方法 51 session.doWork(new Work(){ 52 53 @Override 54 public void execute(Connection connection) throws SQLException { 55 connection.setAutoCommit(true); 56 } 57 58 }); 59 session.save(s);//保存对象进入数据库 60 session.flush(); 61 } 62 63 }
但是不推荐使用这种办法。
hibernate_02_session介绍
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