applicationContext.xml中我的数据源类是com.mchange.v2.c3p0.ComboPooledDataSource,现在我要解决hibernate只读的错误,我该怎么写,好像这个类没有readOnly属性
时间: 2024-01-22 18:21:06 浏览: 125
通过disabled和readonly将input设置为只读效果
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是的,`ComboPooledDataSource`类并没有`readOnly`属性。如果你想在Hibernate中使用只读模式,你可以通过配置一个拦截器来实现。
首先,在Spring配置文件中,你需要声明一个`SessionFactory` bean,并将一个`HibernateTransactionManager` bean与之关联。然后,你需要将一个`ReadOnlyInterceptor` bean与`SessionFactory`关联。
下面是配置文件的示例:
```xml
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!-- 数据源配置 -->
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan">
<list>
<value>com.example.domain</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<bean id="readOnlyInterceptor" class="com.example.interceptor.ReadOnlyInterceptor" />
<bean id="defaultAdvisor" class="org.springframework.aop.support.DefaultPointcutAdvisor">
<property name="advice">
<bean class="org.springframework.transaction.interceptor.TransactionInterceptor">
<property name="transactionManager" ref="transactionManager" />
<property name="transactionAttributes">
<props>
<prop key="*">PROPAGATION_REQUIRED,-Throwable</prop>
</props>
</property>
</bean>
</property>
<property name="pointcut">
<bean class="org.springframework.aop.support.JdkRegexpMethodPointcut">
<property name="patterns">
<list>
<value>com.example.service.*</value>
</list>
</property>
</bean>
</property>
</bean>
<bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
<property name="beanNames">
<list>
<value>*Service</value>
</list>
</property>
<property name="interceptorNames">
<list>
<value>readOnlyInterceptor</value>
</list>
</property>
</bean>
```
在上面的配置文件中,我们声明了一个名为`readOnlyInterceptor`的拦截器,并将其与`SessionFactory` bean关联。然后,我们使用`BeanNameAutoProxyCreator` bean将此拦截器应用于所有以`*Service`结尾的bean。
下面是`ReadOnlyInterceptor`类的示例实现:
```java
public class ReadOnlyInterceptor extends EmptyInterceptor {
@Override
public void onDelete(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) {
throw new UnsupportedOperationException("Delete operation is not allowed in read-only mode.");
}
@Override
public boolean onFlushDirty(Object entity, Serializable id, Object[] currentState, Object[] previousState, String[] propertyNames, Type[] types) {
throw new UnsupportedOperationException("Update operation is not allowed in read-only mode.");
}
@Override
public boolean onSave(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) {
throw new UnsupportedOperationException("Insert operation is not allowed in read-only mode.");
}
@Override
public void preFlush(Iterator entities) {
throw new UnsupportedOperationException("Flush operation is not allowed in read-only mode.");
}
@Override
public void postFlush(Iterator entities) {
// Do nothing
}
}
```
在上面的实现中,我们覆盖了`EmptyInterceptor`的一些方法,其中包括`onDelete`、`onFlushDirty`、`onSave`和`preFlush`,并在这些方法中抛出了不支持的操作异常。这样,当Hibernate尝试执行这些操作时,它将抛出异常并停止执行。
最后,只需将`readOnlyInterceptor` bean声明为一个Spring组件,并在配置文件中引用它即可。
希望这可以帮助你解决问题!
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