覆盖缺省数据类型映射和创建自定义类型映射程序的功能。
Overrides default mapping of data types, and the ability to create custom type mappers.
作为可选项,也有可能支持用户自定义类型,这将极大的简化所要求的表达式。
It may optionally support user defined types, which can greatly simplify the required expressions.
类型必须是完全类型,即必须是内置类型或者是已经定义的程序员自定义类型。
The type must be a complete type: it must either be a built-in type or a programmer-defined type that has already been defined.
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