• 吴裕雄--天生自然轻量级JAVA EE企业应用开发Struts2Sping4Hibernate整合开发学习笔记:Hibernate_unidirectional_1-Njointable


    <?xml version="1.0" encoding="GBK"?>
    <project name="hibernate" basedir="." default="">
        <property name="src" value="src"/>
        <property name="dest" value="classes"/>
    
        <path id="classpath">
            <fileset dir="../../../lib">
                <include name="**/*.jar"/>
            </fileset>
            <pathelement path="${dest}"/>
        </path>
    
        <target name="compile" description="Compile all source code">
            <delete dir="${dest}"/>
            <mkdir dir="${dest}"/>
            <copy todir="${dest}">
                <fileset dir="${src}">
                    <exclude name="**/*.java"/>
                </fileset>        
            </copy>
            <javac destdir="${dest}" debug="true" includeantruntime="yes"
                deprecation="false" optimize="false" failonerror="true">
                <src path="${src}"/>
                <classpath refid="classpath"/>
                <compilerarg value="-Xlint:deprecation"/>
            </javac>
        </target>
    
        <target name="run" description="Run the main class" depends="compile">
            <java classname="lee.PersonManager" fork="yes" failonerror="true">
                <classpath refid="classpath"/>
            </java>
        </target>
    
    </project>
    <?xml version="1.0" encoding="GBK"?>
    <!-- 指定Hibernate配置文件的DTD信息 -->
    <!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
    <!-- hibernate-configuration是配置文件的根元素 -->
    <hibernate-configuration>
        <session-factory>
            <!-- 指定连接数据库所用的驱动 -->
            <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
            <!-- 指定连接数据库的url,其中hibernate是本应用连接的数据库名 -->
            <property name="connection.url">jdbc:mysql://localhost/hibernate</property>
            <!-- 指定连接数据库的用户名 -->
            <property name="connection.username">root</property>
            <!-- 指定连接数据库的密码 -->
            <property name="connection.password">32147</property>
            <!-- 指定连接池里最大连接数 -->
            <property name="hibernate.c3p0.max_size">20</property>
            <!-- 指定连接池里最小连接数 -->
            <property name="hibernate.c3p0.min_size">1</property>
            <!-- 指定连接池里连接的超时时长 -->
            <property name="hibernate.c3p0.timeout">5000</property>
            <!-- 指定连接池里最大缓存多少个Statement对象 -->
            <property name="hibernate.c3p0.max_statements">100</property>
            <property name="hibernate.c3p0.idle_test_period">3000</property>
            <property name="hibernate.c3p0.acquire_increment">2</property>
            <property name="hibernate.c3p0.validate">true</property>
            <!-- 指定数据库方言 -->
            <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
            <!-- 根据需要自动创建数据库 -->
            <property name="hbm2ddl.auto">update</property>
            <!-- 显示Hibernate持久化操作所生成的SQL -->
            <property name="show_sql">true</property>
            <!-- 将SQL脚本进行格式化后再输出 -->
            <property name="hibernate.format_sql">true</property>
            <!-- 罗列所有持久化类的类名 -->
            <mapping class="org.crazyit.app.domain.Person"/>
            <mapping class="org.crazyit.app.domain.Address"/>
        </session-factory>
    </hibernate-configuration>
    package org.crazyit.app.domain;
    
    import java.util.*;
    
    import javax.persistence.*;
    /**
     * Description:
     * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
     * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
     * <br/>This program is protected by copyright laws.
     * <br/>Program Name:
     * <br/>Date:
     * @author  Yeeku.H.Lee kongyeeku@163.com
     * @version  1.0
     */
    @Entity
    @Table(name="address_inf")
    public class Address
    {
        // 标识属性
        @Id @Column(name="address_id")
        @GeneratedValue(strategy=GenerationType.IDENTITY)
        private int addressId;
        // 定义地址详细信息的成员变量
        private String addressDetail;
    
        // 无参数的构造器
        public Address()
        {
        }
        // 初始化全部成员变量的构造器
        public Address(String addressDetail)
        {
            this.addressDetail = addressDetail;
        }
    
        // addressId的setter和getter方法
        public void setAddressId(int addressId)
        {
            this.addressId = addressId;
        }
        public int getAddressId()
        {
            return this.addressId;
        }
    
        // addressDetail的setter和getter方法
        public void setAddressDetail(String addressDetail)
        {
            this.addressDetail = addressDetail;
        }
        public String getAddressDetail()
        {
            return this.addressDetail;
        }
    }
    package org.crazyit.app.domain;
    
    import java.util.*;
    
    import javax.persistence.*;
    /**
     * Description:
     * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
     * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
     * <br/>This program is protected by copyright laws.
     * <br/>Program Name:
     * <br/>Date:
     * @author  Yeeku.H.Lee kongyeeku@163.com
     * @version  1.0
     */
    @Entity
    @Table(name="person_inf")
    public class Person
    {
    	// 标识属性
    	@Id @Column(name="person_id")
    	@GeneratedValue(strategy=GenerationType.IDENTITY)
    	private Integer id;
    	private String name;
    	private int age;
    	// 定义该Person实体所有关联的Address实体
    	@OneToMany(targetEntity=Address.class)
    	// 映射连接表为person_address
    	@JoinTable(name="person_address",
    		// 定义连接表中名为person_id的外键列,该外键列参照当前实体对应表的主键列
    		joinColumns=@JoinColumn(name="person_id"
    			, referencedColumnName="person_id"),
    		// 定义连接表中名为address_id的外键列,
    		// 该外键列参照当前实体的关联实体对应表的主键列
    		inverseJoinColumns=@JoinColumn(name="address_id"
    			, referencedColumnName="address_id", unique=true)
    	)
    	private Set<Address> addresses
    		= new HashSet<>();
    
    	// id的setter和getter方法
    	public void setId(Integer id)
    	{
    		this.id = id;
    	}
    	public Integer getId()
    	{
    		return this.id;
    	}
    
    	// name的setter和getter方法
    	public void setName(String name)
    	{
    		this.name = name;
    	}
    	public String getName()
    	{
    		return this.name;
    	}
    
    	// age的setter和getter方法
    	public void setAge(int age)
    	{
    		this.age = age;
    	}
    	public int getAge()
    	{
    		return this.age;
    	}
    
    	// addresses的setter和getter方法
    	public void setAddresses(Set<Address> addresses)
    	{
    		this.addresses = addresses;
    	}
    	public Set<Address> getAddresses()
    	{
    		return this.addresses;
    	}
    }
    

      

    package lee;
    
    import org.hibernate.*;
    import org.hibernate.cfg.*;
    import org.hibernate.service.*;
    import org.hibernate.boot.registry.*;
    /**
     * Description:
     * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
     * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
     * <br/>This program is protected by copyright laws.
     * <br/>Program Name:
     * <br/>Date:
     * @author  Yeeku.H.Lee kongyeeku@163.com
     * @version  1.0
     */
    public class HibernateUtil
    {
        public static final SessionFactory sessionFactory;
    
        static
        {
            try
            {
                // 使用默认的hibernate.cfg.xml配置文件创建Configuration实例
                Configuration cfg = new Configuration()
                    .configure();
                // 以Configuration实例来创建SessionFactory实例
                ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
                    .applySettings(cfg.getProperties()).build();
                sessionFactory = cfg.buildSessionFactory(serviceRegistry);
            }
            catch (Throwable ex)
            {
                System.err.println("Initial SessionFactory creation failed." + ex);
                throw new ExceptionInInitializerError(ex);
            }
        }
    
        // ThreadLocal可以隔离多个线程的数据共享,因此不再需要对线程同步
        public static final ThreadLocal<Session> session
            = new ThreadLocal<Session>();
    
        public static Session currentSession()
            throws HibernateException
        {
            Session s = session.get();
            // 如果该线程还没有Session,则创建一个新的Session
            if (s == null)
            {
                s = sessionFactory.openSession();
                // 将获得的Session变量存储在ThreadLocal变量session里
                session.set(s);
            }
            return s;
        }
    
        public static void closeSession()
            throws HibernateException
        {
            Session s = session.get();
            if (s != null)
                s.close();
            session.set(null);
        }
    }
    package lee;
    
    import org.hibernate.Transaction;
    import org.hibernate.Session;
    
    import java.util.Date;
    import java.util.Set;
    import java.util.HashSet;
    
    import org.crazyit.app.domain.*;
    /**
     * Description:
     * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
     * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
     * <br/>This program is protected by copyright laws.
     * <br/>Program Name:
     * <br/>Date:
     * @author  Yeeku.H.Lee kongyeeku@163.com
     * @version  1.0
     */
    public class PersonManager
    {
        public static void main(String[] args)
        {
            PersonManager mgr = new PersonManager();
            mgr.testPerson();
            HibernateUtil.sessionFactory.close();
        }
    
        private void testPerson()
        {
            Session session = HibernateUtil.currentSession();
            Transaction tx = session.beginTransaction();
            // 创建一个瞬态的Person对象
            Person p = new Person();
            // 设置Person的name为crazyit.org字符串
            p.setName("crazyit.org");
            p.setAge(21);
            // 创建一个瞬态的Address对象
            Address a = new Address("广州天河");
            // 设置Person和Address之间的关联关系
            p.getAddresses().add(a);
            // 创建一个瞬态的Address对象
            Address a2 = new Address("上海虹口");
            // 设置Person和Address之间的关联关系
            p.getAddresses().add(a2);
            // 由于采用了连接表来维护1-N关联关系,因此不存在主从表关系,
            // 程序可以随意控制先持久化哪个实体。
            // 持久化Address对象
            session.persist(a2);
            // 持久化Person对象
            session.save(p);
            // 持久化Address对象
            session.persist(a);
            tx.commit();
            HibernateUtil.closeSession();
        }
    }
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  • 原文地址:https://www.cnblogs.com/tszr/p/12369780.html
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