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MyEclipse Hibernate 学习总结

分类: 文章 • 2024-05-17 16:09:40

最近在学习Hibernate,先把学习的过程记录一下,方便自己以后复习.

1.使用工具

MyEclipse 10

 

2.

1）新建Java程序

2）右键程序，选择MyEclipse-> Add Hibernate Capabilities.

MyEclipse Hibernate 学习总结

会自动生成HibernateSessionFactory.java文件和hibernate.cfg.xml文件

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package com.water.testhibernate;
 
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.cfg.Configuration;
 
/**
 * Configures and provides access to Hibernate sessions, tied to the
 * current thread of execution.  Follows the Thread Local Session
 * pattern, see {@link http://hibernate.org/42.html }.
 */
public class HibernateSessionFactory {
 
    /**
     * Location of hibernate.cfg.xml file.
     * Location should be on the classpath as Hibernate uses 
     * #resourceAsStream style lookup for its configuration file.
     * The default classpath location of the hibernate config file is
     * in the default package. Use #setConfigFile() to update
     * the location of the configuration file for the current session.  
     */
    private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
    private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
    private  static Configuration configuration = new Configuration();   
    private static org.hibernate.SessionFactory sessionFactory;
    private static String configFile = CONFIG_FILE_LOCATION;
 
    static {
        try {
            configuration.configure(configFile);
            sessionFactory = configuration.buildSessionFactory();
        } catch (Exception e) {
            System.err
                    .println("%%%% Error Creating SessionFactory %%%%");
            e.printStackTrace();
        }
    }
    private HibernateSessionFactory() {
    }
     
    /**
     * Returns the ThreadLocal Session instance.  Lazy initialize
     * the <code>SessionFactory</code> if needed.
     *
     *  @return Session
     *  @throws HibernateException
     */
    public static Session getSession() throws HibernateException {
        Session session = (Session) threadLocal.get();
 
        if (session == null || !session.isOpen()) {
            if (sessionFactory == null) {
                rebuildSessionFactory();
            }
            session = (sessionFactory != null) ? sessionFactory.openSession()
                    : null;
            threadLocal.set(session);
        }
 
        return session;
    }
 
    /**
     *  Rebuild hibernate session factory
     *
     */
    public static void rebuildSessionFactory() {
        try {
            configuration.configure(configFile);
            sessionFactory = configuration.buildSessionFactory();
        } catch (Exception e) {
            System.err
                    .println("%%%% Error Creating SessionFactory %%%%");
            e.printStackTrace();
        }
    }
 
    /**
     *  Close the single hibernate session instance.
     *
     *  @throws HibernateException
     */
    public static void closeSession() throws HibernateException {
        Session session = (Session) threadLocal.get();
        threadLocal.set(null);
 
        if (session != null) {
            session.close();
        }
    }
 
    /**
     *  return session factory
     *
     */
    public static org.hibernate.SessionFactory getSessionFactory() {
        return sessionFactory;
    }
 
    /**
     *  return session factory
     *
     *  session factory will be rebuilded in the next call
     */
    public static void setConfigFile(String configFile) {
        HibernateSessionFactory.configFile = configFile;
        sessionFactory = null;
    }
 
    /**
     *  return hibernate configuration
     *
     */
    public static Configuration getConfiguration() {
        return configuration;
    }
 
}

  

创建Grade文件

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public class Grade implements Serializable {
    private int gid;
    private String gname;
    private String gdesc;
    private Set<Student> students;
 
    public int getGid() {
        return gid;
    }
 
    public void setGid(int gid) {
        this.gid = gid;
    }
 
    public String getGname() {
        return gname;
    }
 
    public void setGname(String gname) {
        this.gname = gname;
    }
 
    public String getGdesc() {
        return gdesc;
    }
 
    public void setGdesc(String gdesc) {
        this.gdesc = gdesc;
    }
 
    public Grade() {
        super();
    }
 
    public Set<Student> getStudents() {
        return students;
    }
 
    public void setStudents(Set<Student> students) {
        this.students = students;
    }
 
    public Grade(int gid, String gname, String gdesc) {
        super();
        this.gid = gid;
        this.gname = gname;
        this.gdesc = gdesc;
    }
 
    public Grade(String gname, String gdesc) {
        super();
        this.gname = gname;
        this.gdesc = gdesc;
    }
 
}

创建Grade.hbm.xml文件

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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="com.water.model.Grade" table="grade">
        <id name="gid" column="gid" type="java.lang.Integer">
            <generator class="increment"></generator>
        </id>
        <property name="gname" type="java.lang.String">
            <column name="gname" length="20" not-null="true"></column>
        </property>
        <property name="gdesc">
            <column name="gdesc"></column>
        </property>
        <!-- 配置一对多关联关系 -->
        <set name="students" table="student">
            <key column="gid"></key>
            <one-to-many class="com.water.model.Student"/>
        </set>
    </class>
</hibernate-mapping>

 

 

 

创建Student文件

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public class Student implements Serializable {
    private int sid;
    private String sname;
    private String sex;
    // 在多方定义一个一方的引用
    private Grade grade;
 
    public Grade getGrade() {
        return grade;
    }
 
    public void setGrade(Grade grade) {
        this.grade = grade;
    }
 
    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 getSex() {
        return sex;
    }
 
    public void setSex(String sex) {
        this.sex = sex;
    }
 
    public Student() {
        super();
    }
 
    public Student(String sname, String sex) {
        super();
        this.sname = sname;
        this.sex = sex;
    }
 
}

 创建Student.hbm.xml  文件

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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="com.water.model.Student" table="student">
        <id name="sid" column="sid" type="java.lang.Integer">
            <generator class="increment"></generator>
        </id>
        <property name="sname" type="java.lang.String">
            <column name="sname" length="20" not-null="true"></column>
        </property>
        <property name="sex">
            <column name="sex"></column>
        </property>
        <!-- 配置多对一关联关系 -->
        <!-- <many-to-one name="grade" class="com.water.model.Grade" column="gid" cascade="all"></many-to-one> -->
    </class>
</hibernate-mapping>

 最后hibernate.cfg.xml文件的配置如下：

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<?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">
 
<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>
 
<session-factory>
 
    <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="connection.username">root</property>
    <property name="connection.password">root</property>
    <property name="show_sql">true</property>
    <!-- create and update the database automaticlly -->
    <property name="hbm2ddl.auto">update</property>
    <property name="myeclipse.connection.profile">ms_sql</property>
    <property name="connection.url">jdbc:mysql://localhost:3306/mysql</property>
 
    <mapping resource="com/water/model/Student.hbm.xml" />
    <mapping resource="com/water/model/Grade.hbm.xml" />
</session-factory>
 
</hibernate-configuration>

 <property name="connection.username">root</property>数据库用户名

<property name="connection.password">root</property> 数据库密码

<property name="connection.url">jdbc:mysql://localhost:3306/mysql</property> mysql为数据库名

 

 创建测试类Test.java

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public class Test {
    public static void main(String[] args) {
        add();
    }
     
        public static void add(){
            Grade g=new Grade("software developer", "Java Android");
            Student stu1=new Student("zhasan", "boy");
            Student stu2=new Student("lisi", "girl");
             
            Session session=HibernateSessionFactory.getSession();
            Transaction tx=session.beginTransaction();
            session.save(g);
            session.save(stu1);
            session.save(stu2);
            tx.commit();
            HibernateSessionFactory.closeSession();
        }
}

 运行后的效果如下:

MyEclipse Hibernate 学习总结

说明已经插入成功.

 



本文转自Work Hard Work Smart博客园博客，原文链接：http://www.cnblogs.com/linlf03/p/5139947.html，如需转载请自行联系原作者

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