Property'hibernate.dialect'is unseen（Using Spring Data）

Question

我正在使用Spring Data。 我得到了“org.hibernate.HibernateException：当'hibernate.dialect'未设置时，连接不能为空'部署到JBoss7。 但我没有设置属性（databasePlatform - > org.hibernate.dialect.MySQL5Dialect）在我的应用程序-context.xml中：

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xmlns:context="http://www.springframework.org/schema/context" 
     xmlns:tx="http://www.springframework.org/schema/tx" 
     xmlns:jpa="http://www.springframework.org/schema/data/jpa" 
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd 
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd 
     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd"> 

    <context:component-scan base-package="com.myproj.persistence.jpa" /> 

    <jpa:repositories base-package="com.myproj.persistence.jpa" /> 

    <tx:annotation-driven transaction-manager="transactionManager"/> 

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> 
     <property name="driverClassName" value="com.mysql.jdbc.Driver" /> 
     <property name="url" value="jdbc:mysql://myhost:port/schema" /> 
     <property name="username" value="root" /> 
     <property name="password" value="123456" /> 
    </bean> 

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> 
     <property name="entityManagerFactory" ref="entityManagerFactory" /> 
    </bean> 

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> 
     <property name="dataSource" ref="dataSource"/> 
     <property name="persistenceUnitName" value="quizPersistenceUnit"/> 
     <property name="jpaVendorAdapter"> 
      <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> 
       <property name="showSql" value="false"/> 
       <property name="database" value="MYSQL"/> 
       <property name="generateDdl" value="false"/> 
       <property name="databasePlatform" value="org.hibernate.dialect.MySQL5Dialect"/> 
      </bean> 
     </property> 
    </bean> 

</beans> 

这是我的persistence.xml：

<?xml version="1.0" encoding="UTF-8"?> 
<persistence version="1.0" 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"> 
    <persistence-unit name="quizPersistenceUnit"> 
     <class>com.myproj.domain.Quiz</class> 
     <class>com.myproj.domain.QuizAnswer</class> 
    </persistence-unit> 
</persistence> 

然而，当我设置这个属性在persistence.xml中是这样的：

<?xml version="1.0" encoding="UTF-8"?> 
<persistence version="1.0" 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"> 
    <persistence-unit name="quizPersistenceUnit"> 
     <properties> 
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/> 
     </properties> 
     <class>com.myproj.domain.Quiz</class> 
     <class>com.myproj.domain.QuizAnswer</class> 
    </persistence-unit> 
</persistence> 

一切都很好。当然，我不想在persistence.xml中链接到数据库实现。

谢谢！

Answer 1

如果您使用JpaVendorAdapter未在配置中指定持久性单元。

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> 
     <property name="dataSource" ref="dataSource"/> 
     <property name="jpaVendorAdapter"> 
      <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> 
       <property name="showSql" value="false"/> 
       <property name="database" value="MYSQL"/> 
       <property name="generateDdl" value="false"/> 
       <property name="databasePlatform" value="org.hibernate.dialect.MySQL5Dialect"/> 
      </bean> 
     </property> 
    </bean> 

一旦这个改变了，你将需要改变你的组件扫描来选择实体。

<context:component-scan base-package="com.myproj.persistence.jpa, com.myproj.domain" />