[英]Google Appengine Cloud SQL issue with Spring Hibernate
我在Amazon EC2上使用MySQL运行Spring Hibernate Application。 我正在考虑将我的应用程序移植到Google App Engine,因为谷歌现在通过Google Can SQL支持MySQL。
因此,将我现有的应用程序配置为Google App Engine Web应用程序,然后编译代码而不会出现任何错误。 我没有对我现有的应用程序进行任何更改,它已编译并创建了所需的表,并且服务器已成功启动。
但是,当运行通过hibernate访问数据库的应用程序时,我收到以下错误。
org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Cannot open connection
at org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:596)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:371)
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:335)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:105)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy30.findById(Unknown Source)
at com.openentry.catgen.services.impl.WebsiteServiceImpl.getMasterDomain(WebsiteServiceImpl.java:99)
我正在为我的实体类使用注释。
有什么我需要改变的吗?
下面是我的applicationContext.xml
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource"
p:driverClassName="${jdbc.driverClassName}" p:url="${jdbc.url}"
p:username="${jdbc.username}" p:password="${jdbc.password}" />
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"
p:dataSource-ref="dataSource" p:configurationClass="org.hibernate.cfg.AnnotationConfiguration"
p:packagesToScan="com.package.app.entities">
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
<prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
<prop key="hibernate.generate_statistics">${hibernate.generate_statistics}</prop>
<prop key="hibernate.connection.useUnicode">${hibernate.connection.useUnicode}</prop>
<prop key="hibernate.connection.characterEncoding">${hibernate.connection.characterEncoding}</prop>
<prop key="hibernate.connection.charSet">${hibernate.connection.charSet}</prop>
<prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
</props>
</property>
</bean>
<tx:annotation-driven />
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager"
p:sessionFactory-ref="sessionFactory" />
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<constructor-arg>
<ref bean="sessionFactory" />
</constructor-arg>
</bean>
要在Eclipse localhost和appengine实例上运行Google Cloud SQL,您必须检查以下几点。
为localhost选择MySQL实例并配置其值。
Hostname : localhost Database Name : yourdatabasename Port No : 3306 Username : yourMySQLUserName Password : yourPassword Path to MySQL JDBC Jar : Path where your mysql-connector-java-xxxx.jar // I usually put this jar on the WEB-INF/lib
同时配置Google Cloud SQL实例:
Instance Name : something:something // This you will get under Google Cloud SQL tab under Google API Console Database Name : yourdatabasename Username : yourMySQLUserName Password : yourPassword
只需复制你的mysql-connector-java-xxxx.jar文件并将其粘贴到Eclipse中的Appengine SDK的这个位置下
// This path is shown for Eclipse D:\\MyEclipse\\plugins\\com.google.appengine.eclipse.sdkbundle_1.7.2.1\\appengine-java-sdk-1.7.2.1\\lib\\impl\\
应将Driver ClassName和Database Access URL更改为以下值。
AppengineDriver Class Name : com.google.appengine.api.rdbms.AppEngineDriver Database Access URL : jdbc:google:rdbms://instance_name/database_name eg jdbc:google:rdbms://XXXXXX:xxxxx/XXX_databasename user : username // Your Database User by default its root password : password // Your Database Password by default its blank in GAE Cloud SQL
通过遵循所有内容,您可以轻松地在Eclipse中配置Google Cloud SQL。
我认为这是一个连接问题。您编写数据库配置错误或数据库和应用程序之间的连接有数据丢失。
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