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In some instances, you have no choice about your Data Types.If you are assigning Variables that might, at some point, need to contain a Null Value, you must use the Variant Data Type since it is the only Data Type that can contain a Null.The declarations are as follows: The answer is a lot simpler than you realize, Lady Reader.The 'only' Data Type that can be explicitly assigned a Null Value is Variant.Svante Ax Crypt - Free Open Source File Encryption & Online Password Manager - Code snippets usually uncompiled, beware typos.] ______ Don't forget to click "Mark as Answer" on the post(s) that helped you. Svante Ax Crypt - Free Open Source File Encryption & Online Password Manager - Code snippets usually uncompiled, beware typos.] ______ Don't forget to click "Mark as Answer" on the post(s) that helped you.This must be my picky day ;-) The example does not work.
This container has its own properties which you can call that will provide access to the aforementioned Date Time object; after using the correct property - in this case Nullable.If you attempt to assign an invalid value to the Integer Variable, an Error Message will point straight to the problem.Variants must be at least as big and complex as any of the types they contain, which equates with slower, so avoid them. Your code will have statements like if (DOBGiven) rather than if (DOB == Date Time. Hi anders, It is true that you can't get an invalid date with the nullable type, you would just get an exception if you used . Either way, it is a bug which should be caught by you TDD methods. You code may be more complex but it should be easier to understand. Have a nice day a Date; a Date = Get From Database(); // if you get Date then it must be in a Date. Vaue will be null; ----- a Date = null; a Date = Date Time. If using nullable types you get the same advantage, but without the risk of using an invalid date. Because the compiler won't let me use a Date Time unless it has been initialised I would probably end up with a screen that shows a DOB as 1/1/1 and using the nullable type I would have an exception and no screen at all, take your pick. To me, the Has Value property is a detail of the CLR (or is it the language? It's a case of the low-level technical details versus the business case that is being addressed.
You may also find that attempting to use specific Data Types when working with Jet ends up slowing your code.