intersystems-cache - Execute stored functions at run-time

Question

I am trying to retrieve stored functions from a table and have them executed at run-time. Ex MyTableFieldValue contains:

$PARAMETER(MyClass,MyParameterName) 

Where MyTableFieldValue is a field value in a table called MyTable. MyParameterName value in class MyClass is actually "ThisParameter"

I want to do this:

Set parameterName = MyTableFieldValue 

Where parameterName should contain "ThisParameter".

Instead it contains

$PARAMETER(MyClass,MyParameterName).

How do I force cache to actually evaluate what is in MyTableFieldValue ?

Answer 1

如果您的表中的数据不是用户可编辑的，您可以使用间接来计算您的值，如文档中所述

http://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY=GCOS_operators#GCOS_operators_indirection_arg

在您的示例中，它看起来像

Set @("parameterName = "_MyTableFieldValue)

但是，如果用户可以更改表中的数据，这是不安全的，因为他们可以通过这种方式执行几乎任何代码。在这种情况下，您应该解析字符串，找到您的类名和参数名，然后显式运行 $parameter 函数调用。