为什么在JpaTransactionManager中使用jpadialect

问题描述

我正在从Spring in Action学习spring 3.0。

I am learning spring 3.0 from Spring in Action.

在那里它讨论了在JpaTranactionManager中使用jpadialect的重要性

There it talks about importance of having jpadialect in JpaTranactionManager

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

然而，方言已经通过jpaVendorAdaptor在entityManagerFactory的声明中出现。

However the dialect is already present in declaration of entityManagerFactory via jpaVendorAdaptor.

<bean id="entityManagerFactory" class= "org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
  <property name="dataSource" ref="dataSource" />
  <property name="jpaVendorAdapter" ref="jpaVendorAdapter" />
</bean>
<bean id="jpaVendorAdapter" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
  <property name="database" value="HSQL" />
  <property name="showSql" value="true"/>
  <property name="generateDdl" value="false"/>
  <property name="databasePlatform"
            value="org.hibernate.dialect.HSQLDialect" />
</bean>  
 <bean id="dataSource" class="org.springframework.jdbc.datasource. DriverManagerDataSource">
   <property name="driverClassName" value="org.hsqldb.jdbcDriver" />
   <property name="url" value="jdbc:hsqldb:hsql://localhost/spitter/spitter" />
   <property name="username" value="sa" />
   <property name="password" value="" />
 </bean>

在JpaTranactionManager中使用方言是多余的吗？

Is the use of dialect in JpaTranactionManager redundant?

推荐答案

在 JpaTransactionManager 中使用 jpaDialect 对于 jpaVendorAdapter config。他们的配置有不同的用途。

The use of jpaDialect in JpaTransactionManager is no redundant to jpaVendorAdapter config. Their config have different purpose.

你可以参考有很好的解释。

You can refer this post with good explanation.

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