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jpa入门案例

2015-01-07 22:03 162 查看

1.1. 新建一个java工程jpaDemo1

1.2. 在工程下新建一个lib文件夹，用来存放jar包

1.3. 引入下面的jar包

所使用hibernat版本：hibernate-release-4.3.7.Final

Lib\jpa目录和lib\required目录下所有的jar包，mysql驱动包

1.4. Src下新建META-INF目录

1.5. META-INF目录下新建persistence.xml

persistence.xml

<?xml
version="1.0"
encoding="UTF-8"?>
<persistence
xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">


<persistence-unit
name="jpaDemo"
transaction-type="RESOURCE_LOCAL">
<properties>
<property
name="hibernate.dialect"
value="org.hibernate.dialect.MySQL5Dialect"/>
<property
name="hibernate.connection.driver_class"
value="com.mysql.jdbc.Driver"/>
<property
name="hibernate.connection.username"
value="root"/>
<property
name="hibernate.connection.password"
value="root"/>
<property
name="hibernate.connection.url"
value="jdbc:mysql://localhost:3306/mysql?useUnicode=true&characterEncoding=UTF-8"/>
<property
name="hibernate.hbm2ddl.auto"
value="update"/>
<property
name="hibernate.show_sql"
value="true"/>
</properties>
</persistence-unit>
</persistence>

1.6. 新建实体类Person.java

Person.java

package com.morris.entity;

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

@Entity
public
class Person {

@Id
@GeneratedValue
private Integer
id;

private String
name;

private Integer
age;

public Integer getId() {
return
id;
}

public
void setId(Integer id) {
this.id = id;
}

public String getName() {
return
name;
}

public
void setName(String name) {
this.name = name;
}

public Integer getAge() {
return
age;
}

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

public Person( String name, Integer age) {
super();
this.name = name;
this.age = age;
}

public Person() {
super();
// TODO Auto-generated constructor stub
}

@Override
public String toString() {
return
"Person [id=" + id +
", name=" + name +
", age=" + age +
"]";
}

}

1.7. 新建测试类TestPerson.java

TestPerson.java

package com.morris.entity;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

import org.junit.Test;

public
class TestPerson {

@Test
public
void save() {

//实体管理工厂类 jpaDemo为配置文件中持久化单元名
EntityManagerFactory factory = Persistence.createEntityManagerFactory("jpaDemo");
//尸体管理器
EntityManager manager = factory.createEntityManager();

//开始事务
manager.getTransaction().begin();
//持久化person对象
manager.persist(new Person("morris", 22));

//提交事务
manager.getTransaction().commit();

//关闭资源
manager.close();

factory.close();

}

}

1.8. 运行结果

后台打印sql语句：

Hibernate: insert into Person (age, name) values (?, ?)

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