Question

我正在使用一系列教程应用程序来研究不同的Java EE技术。我遵循各种教程，或多或少坚持他们。最近，我开始组建一个简单的Spring CRUD webapp来存储，查找，修改和删除Employee DB表中的员工。我之前已经完成了另一个非常相似的应用程序，它只使用普通的Java和Hibernate，旨在实现完全相同的功能。该应用程序工作正常，所以我决定将这个旧应用程序的数据库连接设置复制到新的Spring应用程序。

问题是，Spring DriverManagerDataSource bean似乎不接受设置与原始Hibernate配置相同的属性，例如＆＃34; hibernate.hbm2ddl.auto＆＃34;，我想要方便地擦除启动时的数据库，或者＆＃34; defaultSchema＆＃34;，Postgres出于某种原因需要它，所以我坚持配置数据库连接。

如何使Spring接受这些属性与旧应用程序中的Hibernate相同，并表现出相同的行为？为什么豆子不能以一种可预测的，合理的方式接受这些特定的属性，就像其他属性一样，例如＆＃34; url＆＃34;或＆＃34;密码＆＃34;？我是否应该设置它们，Spring中是否还有一些其他机制可以处理我想要的属性？

旧应用配置：

hibernate.cfg.xml中

    <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <!-- Database connection settings -->
        <property name="connection.driver_class">org.postgresql.Driver</property>
        <property name="connection.url">jdbc:postgresql://localhost:5432/test2</property>
        <property name="connection.username">postgres</property>
        <property name="connection.password">postgres</property>

        <property name="hibernate.default_schema">public</property>
        <property name="show_sql">true</property>
        <property name="use_sql_comments">true</property>
        <property name="hibernate.hbm2ddl.auto">create</property>

        <mapping class="cz.bsc.hibernatetest.hibernatetutorial.domain.Book" />
        <mapping class="cz.bsc.hibernatetest.hibernatetutorial.domain.Author" />

    </session-factory>
</hibernate-configuration>

从我尝试如上所述修改的教程中获取的部分Spring配置：

弹簧servlet.xml中

<beans...>
    <bean id="ds"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="org.postgresql.Driver"></property>
        <property name="url" value="jdbc:postgresql://localhost:5432/test2"></property>
        <property name="username" value="postgres"></property>
        <property name="password" value="postgres"></property>

        <property name="spring.jpa.hibernate.defaultSchema" value="public"></property>
        <property name="spring.jpa.hibernate.show_sql" value="true"></property>
        <property name="spring.jpa.hibernate.use_sql_comments" value="true"></property>
        <property name="spring.jpa.hibernate.hbm2ddl.auto" value="create"></property>
    </bean>
</beans>

我的应用程序当前形状的完整错误消息。我认为这表明我试图以一种非预期的方式设置属性，因此语法错误排序。

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'empController': Unsatisfied dependency expressed through field 'dao'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dao' defined in ServletContext resource [/WEB-INF/spring-servlet.xml]: Cannot resolve reference to bean 'jt' while setting bean property 'template'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jt' defined in ServletContext resource [/WEB-INF/spring-servlet.xml]: Cannot resolve reference to bean 'ds' while setting bean property 'dataSource'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'ds' defined in ServletContext resource [/WEB-INF/spring-servlet.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'spring.jpa.hibernate.defaultSchema' of bean class [org.springframework.jdbc.datasource.DriverManagerDataSource]: Nested property in path 'spring.jpa.hibernate.defaultSchema' does not exist; nested exception is org.springframework.beans.NotReadablePropertyException: Invalid property 'spring' of bean class [org.springframework.jdbc.datasource.DriverManagerDataSource]: Bean property 'spring' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?

Answer 1

Hibernates属性不是数据源定义的一部分。它应该在session-factory bean下定义。

例如：

<beans>
    <bean id="ds"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="org.postgresql.Driver"></property>
        <property name="url" value="jdbc:postgresql://localhost:5432/test2"></property>
        <property name="username" value="postgres"></property>
        <property name="password" value="postgres"></property>
    </bean>


    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">

        <property name="dataSource" ref bean="ds" />
                <property name="packagesToScan" value="db entities package name" />
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.defaultSchema">public</prop>
                <prop key="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.use_sql_comments">true</prop>
                <prop key="hibernate.hbm2ddl.auto">create</prop>
            </props>
        </property>
    </bean>

    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>
</beans>

如何设置Spring的DriverManagerDataSource的某些属性？

1 个答案: