Hibernate学习笔记1.2（Annotation版本的Helloworld）

hibernate 3.0之后开始支持Annotation

接着1.1的项目

首先 需要创建model Teacher.java、

package com.hw.hibernate.model;

public class Teacher {
     private int id;
     private String name;
     private String age;
     private String title;
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }

}

建立数据库teacher表 hibernate可以自动创建 本次先通过手动创建

create table teacher(id int primary key,name varchar(20),age int,title varchar(20));

引入Annotation的jar包

在1.1项目userlibariray里加上annotation的jar包

加完之后在Teacher.java里加上@Entity

Teacher.java

package com.hw.hibernate.model;

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class Teacher {
     private int id;
     private String name;
     private String age;
     private String title;
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    @Id
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }

}

在hibernate.cfg.xml上加上对类的描述（最后一句）

<?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">

<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"></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 Hibernate's 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.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">update</property>

        <mapping resource="com/hw/hibernate/model/Student.hbm.xml"/>
        <mapping class="com.hw.hibernate.model.Teacher"/>
    </session-factory>

</hibernate-configuration>

创建新的测试类 Teacher.java

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;

import com.hw.hibernate.model.Student;
import com.hw.hibernate.model.Teacher;

import javassist.bytecode.annotation.Annotation;

public class teacherTest2 {
   public static void main(String args[]){
       Teacher s = new Teacher();
       s.setId(1);
       s.setName("huangwei");
       s.setAge("21");
       s.setTitle("教授");
       Configuration cf = new AnnotationConfiguration();
       SessionFactory sf = cf.configure().buildSessionFactory();
       Session ss = sf.openSession();
       ss.beginTransaction();
       ss.save(s);
       ss.getTransaction().commit();
       ss.close();
       sf.close();
   }
}

运行Teacher.java

附带：如果敲@不给提示

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Conrent exiets  如果觉得提示的时间过慢可以调整里面的数字