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Entity, application, and request variables share the same syntax and operations. They differ primarily in the scope of their definition. An analogy might help: Entity variables are similar to instance variables, and application variables are similar to class variables in object-oriented languages.
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You should beware that you don't treat persistent variables the same way you treat regular variables. In particular, take note that persistence implies that the values for persistent variables are stored in a database. You cannot copy a persistent variable by reference, only by value. Use caution when manipulating large data structures in persistent variables since you may end up copying the values multiple times if you aren't careful. |
Persistent variables take four forms:
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