play framework2開發（七）

集成JPA

1、在conf/application.conf

db.epay.driver=com.mysql.jdbc.Driver
db.epay.url="jdbc:mysql://localhost:3306/epay"
db.epay.user=root
db.epay.password="1234"
db.epay.jndiName=epayDS
hibernate.use_sql_comments=true

jpa.default=defaultPersistenceUnit

數據庫如果不存在，請在數據庫中手動新建

2、在project/build.scala

val appDependencies = Seq(
    // Add your project dependencies here,
    javaCore,
    javaJdbc,
    javaEbean,
     "mysql" % "mysql-connector-java" % "5.1.18",
     "org.hibernate" % "hibernate-entitymanager" % "3.6.9.Final",
     "play" % "play-java-jpa_2.10" % "2.1.0"
     
  )

3、接下里要創建一個正確的JPA配置文件persistence.xml。把它放進conf/META-INF目錄（沒有則新建）

<?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_2_0.xsd"
             version="2.0">
             
<persistence-unit name="defaultPersistenceUnit" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<non-jta-data-source>epayDS</non-jta-data-source>
<properties>
<property name="hibernate.hbm2ddl.auto" value="update" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
</properties>
</persistence-unit>
</persistence>

註解：persistence-unit name就是application.conf裏的jpa.default值，non-jta-data-source就是db.epay.jndiName。

4、java類

import play.db.jpa.*;


public class UserControl extends Controller {

	 final static Form<User> userForm = form(User.class);
	 @Transactional
	 public static Result register() {
//		 DataSource ds = DB.getDataSource("epay");
//		 try {
//			System.out.println("conn:"+!ds.getConnection().isClosed());
//		} catch (SQLException e) {
//			// TODO Auto-generated catch block
//			e.printStackTrace();
//		}
	     return ok(form.render());
	 }

方法加個@Transactional。

啓動測試看有無錯誤。