IntellJ 13.x JPA Persistence Sample

跟上一篇差很少，一些基本的東西。

此次是JPA + Spring MVC 3.0

1.創建Project

2.Add JPA Support

3.咱們以Hibernate爲例，設置JPA的Provider爲Hibernate

4.添加persistence.xml，這裏標準的位置應該是src/main/resources/META-INF，因此咱們要創建resource和META-INF的文件夾

5.回到project structure->modules->JPA，給JPA添加咱們剛剛創建的persistence.xml文件

6.修改POM.XML添加兩個jar,一個是hibernate-entitymanager,一個是mysql connector

7.修改一下咱們的persistence.xml,(這裏你也能夠先不添加persistence.xml,只是把META-INF建好，而後從第5步那生成也能夠）

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">
    <persistence-unit name="personDB">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/test"/>
            <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
            <property name="hibernate.connection.username" value="root"/>
            <property name="hibernate.connection.password" value="9ijn)OKM"/>
            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
        </properties>
    </persistence-unit>
</persistence>

 

7.View->Tools windows->DataBase創建一個DataSource

8.View->Tools Windows->Persistence->Generate Persistence Mapping->By Database Schema

選定位置

9.這時候咱們已經有了生成出來的Entity

10. 注意這個時候你若是Console->來作hql查詢的時候，他會顯示錯誤，這個如今你能夠不用理會，等build以後本身就行了

11.這個時候檢查一下persistence.xml文件，主要看一下，class是否是已經加到xml裏面，完整的persistence.xml應該是這樣

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">
    <persistence-unit name="personDB">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>com.springapp.modlels.OfficeEntity</class>
        <properties>
            <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/test"/>
            <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
            <property name="hibernate.connection.username" value="root"/>
            <property name="hibernate.connection.password" value="9ijn)OKM"/>
            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
        </properties>
    </persistence-unit>
</persistence>

12.加一個add.jsp，在修改一下controller

package com.springapp.mvc;

import com.springapp.modlels.OfficeEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

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

@Controller
@RequestMapping("/")
public class HelloController {
    @RequestMapping(method = RequestMethod.GET)
    public String printWelcome(ModelMap model) {
        model.addAttribute("message", "Hello world!");
        return "hello";
    }

    @RequestMapping(method = RequestMethod.GET, value="add")
    public String add(ModelMap model) {
        model.addAttribute("message", "Hello world!");
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("personDB");
        EntityManager mgr = emf.createEntityManager();
        mgr.getTransaction().begin();
        OfficeEntity officeEntity = new OfficeEntity();
        officeEntity.setOfficeName("test");
        mgr.persist(officeEntity);
        mgr.getTransaction().commit();
        return "add";
    }

}

運行就能夠了。

這時候若是咱們返回persistence，console hql的話，就沒有問題了

注意，在JBoss下會出現No suitable Driver 的問題，是從getTransaction()開始，不知道爲何會出現這種狀況，在Tomcat下運行正常。