If you find that you can't do what you need with the standard tools, ask yourself if you can do what you need with a custom codeelement.
如果您发现用标准工具您不能做您需要做的,那么问问您自己您是否可以使用定制代码元素做您需要做的。
2
Listing 11 USES the value of col2 as a parameter to restrict DELETE operations based on the value of an XML element (the zip or zip codeelement of a client's address).