hibernate学习2(以单元测试方式练习)

一、新建一个java工程名为：hibernate_0200；

二、导入必要的包：hibernate相关和junit4；

三、目录结构如图：

四、各个对应的类：

Category：

View Code

package com.bjsxt.hibernate;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

import org.hibernate.annotations.BatchSize;

@Entity

public class Category {
    private int id;
    private String name;
    @Id
    @GeneratedValue
    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;
    }
}

Msg：

View Code

package com.bjsxt.hibernate;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;

@Entity
public class Msg {
    private int id;
    private String cont;
    private Topic topic;
    @ManyToOne
    public Topic getTopic() {
        return topic;
    }
    public void setTopic(Topic topic) {
        this.topic = topic;
    }
    @Id
    @GeneratedValue
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    
    public String getCont() {
        return cont;
    }
    public void setCont(String cont) {
        this.cont = cont;
    }
    
}

MsgInfo：

View Code

package com.bjsxt.hibernate;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;


public class MsgInfo {
    private int id;
    private String cont;
    private String topicName;
    private String categoryName;
    public MsgInfo(int id, String cont, String topicName, String categoryName) {
        super();
        this.id = id;
        this.cont = cont;
        this.topicName = topicName;
        this.categoryName = categoryName;
    }
    public String getTopicName() {
        return topicName;
    }
    public void setTopicName(String topicName) {
        this.topicName = topicName;
    }
    public String getCategoryName() {
        return categoryName;
    }
    public void setCategoryName(String categoryName) {
        this.categoryName = categoryName;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    
    public String getCont() {
        return cont;
    }
    public void setCont(String cont) {
        this.cont = cont;
    }
    
}

Topic：

View Code

package com.bjsxt.hibernate;

import java.util.Date;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;

import org.hibernate.annotations.BatchSize;

@Entity
public class Topic {
    private int id;
    private String title;
    private Category category;
    
    private Date createDate;
    
    public Date getCreateDate() {
        return createDate;
    }
    public void setCreateDate(Date createDate) {
        this.createDate = createDate;
    }
    @ManyToOne
    public Category getCategory() {
        return category;
    }
    public void setCategory(Category category) {
        this.category = category;
    }
    @Id
    @GeneratedValue
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    
}

hibernate.cfg.xml:

View Code

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

         
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost/hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password">admin</property>
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
       <!--
        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
        <property name="connection.url">jdbc:oracle:thin:@localhost:1521:SXT</property>
        <property name="connection.username">scott</property>
        <property name="connection.password">tiger</property>
          <property name="dialect">org.hibernate.dialect.OracleDialect</property>
       -->

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</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.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>
        <property name="format_sql">true</property>

        <!-- Drop and re-create the database schema on startup
        <property name="hbm2ddl.auto">update</property>
         -->
        <!--  
        
        <mapping resource="com/bjsxt/hibernate/Group.hbm.xml"/>
         <mapping resource="com/bjsxt/hibernate/User.hbm.xml"/>
         -->
         <mapping class="com.bjsxt.hibernate.Category"/>
          <mapping class="com.bjsxt.hibernate.Msg"/>
          <mapping class="com.bjsxt.hibernate.Topic"/>
          
        
        
    </session-factory>

</hibernate-configuration>

log4j.properties:

View Code

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c:%L - %m%n

### direct messages to file hibernate.log ###
#log4j.appender.file=org.apache.log4j.FileAppender
#log4j.appender.file.File=hibernate.log
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=warn, stdout

#log4j.logger.org.hibernate=info
#log4j.logger.org.hibernate=debug

### log HQL query parser activity
#log4j.logger.org.hibernate.hql.ast.AST=debug

### log just the SQL
#log4j.logger.org.hibernate.SQL=debug

### log JDBC bind parameters ###
#log4j.logger.org.hibernate.type=info
#log4j.logger.org.hibernate.type=debug

### log schema export/update ###
log4j.logger.org.hibernate.tool.hbm2ddl=debug

### log HQL parse trees
#log4j.logger.org.hibernate.hql=debug

### log cache activity ###
#log4j.logger.org.hibernate.cache=debug

### log transaction activity
#log4j.logger.org.hibernate.transaction=debug

### log JDBC resource acquisition
#log4j.logger.org.hibernate.jdbc=debug

### enable the following line if you want to track down connection ###
### leakages when using DriverManagerConnectionProvider ###
#log4j.logger.org.hibernate.connection.DriverManagerConnectionProvider=trace

HibernateQLTest:

View Code

package com.bjsxt.hibernate;

import java.util.Date;
import java.util.Iterator;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

public class HibernateQLTest {
    private static SessionFactory sf;
    
    @BeforeClass
    public static void beforeClass() {
        sf = new AnnotationConfiguration().configure().buildSessionFactory();
    }
    @AfterClass
    public static void afterClass() {
        sf.close();
    }
    
    @Test
    public void testSchemaExport() {
        new SchemaExport(new AnnotationConfiguration().configure()).create(false, true);
    }
    
    @Test
    public void testSave() {
        Session session = sf.openSession();
        session.beginTransaction();
        
        for(int i=0; i<10; i++) {
            Category c = new Category();
            c.setName("c" + i);
            session.save(c);
        }
        
        for(int i=0; i<10; i++) {
            Category c = new Category();
            c.setId(1);
            Topic t = new Topic();
            t.setCategory(c);
            t.setTitle("t" + i);
            t.setCreateDate(new Date());
            session.save(t);
            
        }
        
        for(int i=0; i<10; i++) {
            
            Topic t = new Topic();
            t.setId(1);
            Msg m = new Msg();
            m.setCont("m" + i);
            m.setTopic(t);
            session.save(m);
            
        }
        
        session.getTransaction().commit();
        session.close();
    }
    
    //list 与 iterate 
    @Test
    public void testQuery5() {
        Session session = sf.openSession();
        session.beginTransaction();
        Iterator<Topic> topics = session.createQuery("from Topic").iterate();
        while(topics.hasNext()){ 
            System.out.println(topics.next().getTitle());
        }
        
        Iterator<Topic> topics2 = session.createQuery("from Topic").iterate();
        while(topics2.hasNext()){ 
            System.out.println(topics2.next().getTitle());
        }
        
        
        session.getTransaction().commit();
        session.close();
    }
    
    //list 与 iterate 
    @Test
    public void testQuery6() {
        Session session = sf.openSession();
        session.beginTransaction();
        Iterator<Topic> topics = session.createQuery("from Topic").list().iterator();
        while(topics.hasNext()){ 
            System.out.println(topics.next().getTitle());
        }
        
        Iterator<Topic> topics2 = session.createQuery("from Topic").list().iterator();
        while(topics2.hasNext()){ 
            System.out.println(topics2.next().getTitle());
        }
        
        
        session.getTransaction().commit();
        session.close();
    }
    
    public static void main(String[] args) {
        beforeClass();
    }
}

 五、运行如下：