Hibernate(Annotation)学习笔记一

    环境：hibernate-release-4.2.3.Final; junit-4.10.jar以及mysql-connector-java-commercial-5.1.25-bin.jar

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

<hibernate-configuration>

    <session-factory>

        <!-- Database connection settings -->
        <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">root</property>

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

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- Enable Hibernates 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.internal.NoCacheProvider</property>

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

        <!-- Drop and re-create the database schema on startup -->
        <property name="hbm2ddl.auto">create</property>

        <!-- <mapping resource="com/hsh/hibernate/model/Student.hbm.xml"/> -->
        <mapping class="com.hsh.hibernate.model.Teacher"/>

    </session-factory>

</hibernate-configuration>

    Teacher.java
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package com.hsh.hibernate.model;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.EnumType;
import javax.persistence.Enumerated;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.TableGenerator;

@Entity
/*@TableGenerator(
    name="TEACHER_GEN",
    table="TEACHER_GENERATOR_TABLE",//数据库中表名，使用键值对字段名
    pkColumnName = "PK_key",//数据库中字段名
    valueColumnName = "PK_VALUE",//数据库中字段名
    pkColumnValue="_Teacher",//对应的数据库
    allocationSize=20//步长，表示PK_VALUE字段值减去1 再乘以20就是所对应_Teacher表中字段的值
)*/
@Table(name="_Teacher")//表示不是对应Teacher表，而是对应_Teacher
public class Teacher {

    private int id;
    private String name;
    private String title;
    private Sex sex;
    @Enumerated(EnumType.STRING)
    public Sex getSex() {
        return sex;
    }
    public void setSex(Sex sex) {
        this.sex = sex;
    }
    @Id//设置主键
    @Column(name="_id")//id属性存入_id列中
    @GeneratedValue//自动增值，mysql中相当于auto increment,根据数据库自动选择
    //@GeneratedValue(strategy=GenerationType.IDENTITY)自动增值，指定类型;IDENTITY适用于sql，不适用于oracle.
    //@GeneratedValue(strategy=GenerationType.TABLE,generator="TEACHER_GEN")//适用于跨数据平台，一般比较少用
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Column(name="_name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }

}

    
    Teacher_Test.java
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package com.hsh.hibernate.model;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistryBuilder;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;


public class Teacher_Test {
    private static SessionFactory sf=null;
    @BeforeClass
    public static void beforeClass(){
        sf=new Configuration().configure().buildSessionFactory(new ServiceRegistryBuilder().applySettings(new Configuration().configure().getProperties()).buildServiceRegistry());
    }
    @Test
    public void testTeacherSave(){
        Teacher t =new Teacher();
        //t.setId(1);
        t.setName("t1");
        t.setTitle("middle");
        t.setSex(Sex.m);
        //Configuration config = new Configuration().configure();
        //SessionFactory sf = config.buildSessionFactory(new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry());
        Session session=sf.openSession();
        session.beginTransaction();
        session.save(t);
        session.getTransaction().commit();

    }

    @AfterClass
    public static void afterClass(){
        sf.close();
    }
}