Spring Orm 简明教程

Spring ORM - Persistence Hibernate

persistence.xml 定义了与 Hibernate 相关的各个方面，如下所示。

persistence.xml defines the various aspects related to hibernate like following.

  1. Persistence Unit − A persistence unit containing all the details. It’s name is used to get reference in spring context.

  2. provider − org.hibernate.jpa.HibernatePersistenceProvider class will be used as provider.

  3. Database url and credentials − In properties section, we pass the database related values.

  4. show_sql − to show the generated sql queries

  5. hbm2ddl − to allow hibernate to create tables.

在 src → main > resources > META-INF 文件夹中创建 persistence.xml。

Create persistence.xml in src → main > resources > META-INF folder.

persistence.xml

<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
   http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd" version="2.1">

   <persistence-unit name="Hibernate_JPA">
   <description> Spring Hibernate JPA Configuration Example</description>
   <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
   <properties>
      <property name="javax.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver" />
      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/tutorialspoint?useSSL=false" />
      <property name="javax.persistence.jdbc.user" value="root" />
      <property name="javax.persistence.jdbc.password" value="root@123" />
      <property name="hibernate.show_sql" value="true" />
      <property name="hibernate.hbm2ddl.auto" value="create" />
   </properties>
   </persistence-unit>
</persistence>