Hibernate基础案例1

使用到的是MySQL数据库

1.在项目中先引入jar包，并添加引用

 <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.3</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>antlr</groupId>
      <artifactId>antlr</artifactId>
      <version>2.7.</version>
    </dependency>

    <dependency>
      <groupId>commons-collections</groupId>
      <artifactId>commons-collections</artifactId>
      <version>3.2.</version>
    </dependency>

    <dependency>
      <groupId>commons-logging</groupId>
      <artifactId>commons-logging</artifactId>
      <version>1.1.</version>
    </dependency>

    <dependency>
      <groupId>dom4j</groupId>
      <artifactId>dom4j</artifactId>
      <version>1.6.</version>
    </dependency>

    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-core</artifactId>
      <version>5.2..Final</version>
    </dependency>

    <dependency>
      <groupId>org.hibernate.javax.persistence</groupId>
      <artifactId>hibernate-jpa-2.0-api</artifactId>
      <version>1.0..Final</version>
    </dependency>

    <dependency>
      <groupId>javassist</groupId>
      <artifactId>javassist</artifactId>
      <version>3.12..GA</version>
    </dependency>

    <dependency>
      <groupId>javax.transaction</groupId>
      <artifactId>jta</artifactId>
      <version>1.1</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/log4j/log4j -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.</version>
    </dependency>

    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.6.</version>
    </dependency>

    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.</version>
      <scope>test</scope>
    </dependency>
    <!--mysql-->
    <dependency>
      <groupId>org.wisdom-framework</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.34_1</version>
    </dependency>

  </dependencies>

在引用jar包的时候先不要引用javaee-api的jar，会报错

2.写学生的实体类

 //学号
    private Integer sid;
    //姓名
    private String name;
    //年龄
    private Integer age;

3.Hibernate.cfg.xml配置  （cfg表示的是configuration）

 <?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>
         <!--数据库MSQ驱动-->
         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
         <!--数据库URL-->
         <property name="connection.url">jdbc:mysql://localhost/hibernates?
             characterEncoding=gb2312</property>
         <!--数据库用户名-->
          <property name="connection.username">root</property>
             <!--数据库密码-->
         <property name="connection.password">root</property>
         <!--方言-->
         <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

        <!--输出所有语句到控制台-->
        <property name="hibernate.show_sql">true</property>

         <!--在log和conlose中打印出更  格式化显示SQL-->
      <property name="hibernate.format_sql">true</property>

         <!-- hbm2ddl  -->
         <property name="hibernate.hbm2ddl.auto">update</property>

         <!-- 指定当前session范围和上下文 thread指当前线程来跟踪管理 -->
         <property name="current_session_context_class">thread</property>

         <!-- 映射文件配置，注意配置文件名必须包含其相对于classpath的全路径 -->
         <mapping resource="Student.hbm.xml"></mapping>
     </session-factory>
 </hibernate-configuration>

4.Student.hbm.xml

 <?xml version='1.0'  encoding='utf-8'?>

 <!DOCTYPE hibernate-mapping PUBLIC
         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
 <hibernate-mapping package="cn.happy.entity">
 <class name="Student" table="Student"><!--表名，不区分大小写-->
     <id name="sid" column="sid">
 <generator class="native"></generator>
         <!--native ：
         如果后台是Oracle，自动创建序列
                    后台是MySQL，自动自增
 -->
     </id>
     <property name="name" type="string" column="name"/>
     <property name="age"/>
 </class>
 </hibernate-mapping>

5.测试类，使得数据使用Hibernate保存到数据库中

   @Test
     public void testhibernate() {

         //01准备一个学生对象
         Student stu = new Student();
         stu.setSid();
         stu.setName("白白");
         stu.setAge();

         //02Hibernate 保存
         //读取大配置文件，获取连接的数据库信息
         Configuration cfg=new Configuration().configure();

         //3创建SessionFactory
         SessionFactory factory=cfg.buildSessionFactory();

         //加工session
        Session session=factory.openSession();

        //开启事务
         Transaction tx=session.beginTransaction();

        //5Hibernate

         session.save(stu);

         tx.commit();
         System.out.println("save  ok");
     }

6.实现效果图