这里用到了placeholder特有的一个语言或者将表达形式:${},spring in action 描述如下: In spring wiring ,placeholder values are property names wrapped with ${...},as an exampl,you can resolve the constructor arguments for a BlankDisc in xml like this : <bean id="sgtPeppers&qu
ValidateExternalMetadata Property Indicates whether the component validates its column metadata against its external data source at design time. When this property is true, the component connects to its external data source during design time and val