Hibernate curd 小例题

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本文详细介绍了使用Hibernate框架操作学生表的全过程，包括导入依赖、配置文件、创建实体类、映射文件及测试类，实现了学生信息的增删查改功能。

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hibernate操作步骤

实现以下功能

有一个学生表

学号姓名年龄地址电话

实现新增学生查询所有学生信息根据学号删除学生根据学号修改学生信息

1、导入jar

将oracle安装目录中的jar 通过maven命令安装到本地仓库

2、maven命令安装到本地仓库

Mvn install:install-file -DgroupId=com.oracle -DartifactId=ojdbc6 -Dversion=11.2.0.1.0 -Dpackaging=jar -Dfile=D:\jar\ojdbc6.jar

3、在pom.xml中添加坐标

<dependency>
    <groupId>com.oracle</groupId>
    <artifactId>ojdbc6</artifactId>
    <version>11.2.0.1.0</version>
</dependency>

4、添加hibernate的坐标

不想自己导jar可以改一下版本号，从阿里云下载的jar包

<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.3</version>
</dependency>

<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.3.6.Final</version>
</dependency>

<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-nop</artifactId>
<version>1.7.25</version>
<scope>test</scope>
</dependency>


<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>

<dependency>
<groupId>org.jboss.logging</groupId>
<artifactId>jboss-logging</artifactId>
<version>3.3.0.Final</version>
</dependency>

5、建立hibernate配置文件默认名字为: hibernate.cfg.xml

a.从参考文档中copy(文件头别忘了)

b.修改对应的数据库连接

c.注释暂时用不上的内容

<?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>
        

        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver </property>

        <property name="connection.url" >jdbc:oracle:thin:@localhost:1521:orcl</property>

        <property name="connection.username" >scott</property>

        <property name="connection.password">tiger</property>

        
        <property name="connection.pool_size" >1</property>

        
        <property name="dialect" >org.hibernate.dialect.Oracle10gDialect</property>
        
        
        <property name="current_session_context_class" >thread </property>

        
        
        <property name="show_sql" >true </property>

        
        
        <property name="hbm2ddl.auto" >update </property>

        
        <mapping resource="org/hibernate/tutorial/domain/Event.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

6、创建持久化类

a.对数据库student表进行操作

b.创建包com.vp.pojo

c. 创建实体类 Student

package com.vp.pojo;

import java.io.Serializable;
import java.util.Objects;

/**
* @Description:
* @Author: Li.Hong.Yue
* @Establish: 2018-10-23 20:38
**/

public class Student implements Serializable{
    private Integer stuid;
    private String stuname;
    private Integer age;
    private String address;
    private String phone;

    public Integer getStuid() {
        return stuid;
    }

    public void setStuid(Integer stuid) {
        this.stuid = stuid;
    }

    public String getStuname() {
        return stuname;
    }

    public void setStuname(String stuname) {
        this.stuname = stuname;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Student student = (Student) o;
        return Objects.equals( getStuid(), student.getStuid() ) &&
                Objects.equals( getStuname(), student.getStuname() ) &&
                Objects.equals( getAge(), student.getAge() ) &&
                Objects.equals( getAddress(), student.getAddress() ) &&
                Objects.equals( getPhone(), student.getPhone() );
    }

    @Override
    public int hashCode() {
        return Objects.hash( getStuid(), getStuname(), getAge(), getAddress(), getPhone() );
    }

    @Override
    public String toString() {
        return "Student{" +
                "stuid=" + stuid +
                ", stuname='" + stuname + '\'' +
                ", age=" + age +
                ", address='" + address + '\'' +
                ", phone='" + phone + '\'' +
                '}';
    }
}

7、创建Student类的映射文 Student.hbm.xml(在该类的包下面创建)

a.参考文档copy(文件头别忘了)

b.id元素中填写主键

c. generator取值范围"native"由Hibernate根据使用的数据库自行判断采用identity、hilo、sequence其中一种作为主键生成方式。

d.字段名与列名相同,列名可以省略不写(表名一样)

<?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 package="com.vp.pojo">

    <class name="Student">

        <id name="stuid" >
            <generator class="native"/>
        </id>
        <property name="stuname" />
        <property name="age" />
        <property name="address" />
        <property name="phone"/>
    </class>

</hibernate-mapping>

8、将映射文件加入到配置文件hibernate.cfg.xml中.

a.参考文档

b. <mapping resource="com/hibernate/pojo/ Student.hbm.xml" />

9、编写测试类 Main 在Main中对Dept表进行操作

a.参考文档

b.创建工具类

package com.vp.util;

  

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

  

  /**

 * @Description:

 * @Author: Li.Hong.Yue

 * @Establish: 2018-10-23 20:58

 **/

  

  public class HibernateUtil {

    private static final SessionFactory sessionFactory = buildSessionFactory();

  

  

    private static SessionFactory buildSessionFactory() {

  

        try {

  

            // Create the SessionFactory from hibernate.cfg.xml

  

            return new Configuration().configure().buildSessionFactory();

  

        }

  

        catch (Throwable ex) {

  

            // Make sure you log the exception, as it might be swallowed

  

            System.err.println("Initial SessionFactory creation failed." + ex);

  

            throw new ExceptionInInitializerError(ex);

  

        }

  

    }

  

  

    public static SessionFactory getSessionFactory() {

  

        return sessionFactory;

  

    }

  

}

c.测试类

public static void main( String[] args )

{

    System.out.println( "Hello World!" );

    Session session= HibernateUtil.getSessionFactory().getCurrentSession();

    session.beginTransaction();

  

    /*Student student=new Student();*/

    /*新增*/

    /*student.setStuid( 5 );

    student.setStuname( "C" );

    student.setAge( 19 );

    student.setAddress( "CC" );

    student.setPhone( "1774853165" );

    session.save( student );*/

  

    /*删除*/

    /*student.setStuid( 5 );

    session.delete( student );*/

  

    /*更新*/

    /*student.setStuid( 4 );

    student.setStuname( "哈哈" );

    student.setAge( 19 );

    student.setAddress( "哈哈" );

    student.setPhone( "1774853165" );

    session.update( student );*/

  

    /*单个查询*/

   Student student=(Student)session.get( Student.class,1 );

   System.out.println("student:"+student);

  

    session.getTransaction().commit();

    HibernateUtil.getSessionFactory().close();

  }