属性'hibernate.dialect'看不见(使用弹簧数据)

Question

我使用Spring Data。我有org.hibernate。HibernateException:当"休眠"时，连接不能为空。在部署到JBoss7时，方言"未设置"。但是我确实在我的app-context.xml中设置了属性(databasePlatform -> org.hibernate.dialect.MySQL5Dialect):

    <?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>

但是，当我在persistence.xml中这样设置这个属性时:

<?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，我不想链接到persistence.xml中的DB实现。

谢谢!

Answer 1

如果您使用JpaVendorAdapter，请不要在配置中指定持久单元。

<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>

一旦这被改变，你将需要改变你的组件扫描来挑选实体。

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