3）建立包含BFILE的TABLE 6）在程序中声明LOB Locator 可以用SQL、PL/SQL、3GL中嵌入式SQL或者OCI中的变量值直接INSERT 到LOB中。
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此外，就像使用任何的类，你可以在程序中声明一个String类型的变量而不用考虑他们内部的结构。
Moreover, just as you could with any class, you can declare variables of type String in your programs and use them without considering their underlying structure.
在映射文件中，您还可以声明程序常量。
In the map file, you can also declare application constants.
可能变化的事物（比如产品名称）非常适合使用实体，这与在程序源代码中声明常量很相似。
Things that might change, such as a product name, make particularly good entities, much like declaring constants in program source code.
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