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想法是和程序员的想法不一样的.至于为什么.大家去想一想.跟心理学有关的 Syntax
object.Raise(number, source, description, helpfile, helpcontext)
The Raise method has these parts:
Part Description
object: Always the Err object.
number: A Long integer subtype that identifies the nature of the error. VBScript errors (both VBScript-defined and user-defined errors) are in the range 0C65535.
source: A string expression naming the object or application that originally generated the error. When setting this property for an Automation object, use the form project.class. If nothing is specified, the programmatic ID of the current VBScript project is used.
description: A string expression describing the error. If unspecified, the value in number is examined. If it can be mapped to a VBScript run-time error code, a string provided by VBScript is used as description. If there is no VBScript error corresponding to number, a generic error message is used.
helpfile: The fully qualified path to the Help file in which help on this error can be found. If unspecified, VBScript uses the fully qualified drive, path, and file name of the VBScript Help file.
helpcontext: The context ID identifying a topic within helpfile that provides help for the error. If omitted, the VBScript Help file context ID for the error corresponding to the number property is used, if it exists.
Remarks
All the arguments are optional except number. If you use Raise, however, without specifying some arguments, and the property settings of the Err object contain values that have not been cleared, those values become the values for your error.
When setting the number property to your own error code in an Automation object, you add your error code number to the constant vbObjectError. For example, to generate the error number 1050, assign vbObjectError + 1050 to the number property.
</p> 因为现在数据库都使用标准的SQL语言对数据库进行管理,所以如果是标准SQL语言,两者基本上都可以通用的。SQL Server还有更多的扩展,可以用存储过程,数据库大小无极限限制。 |
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