Databases

A First Course in Database Systems (3rd Edition) by Jeffrey D. Ullman

By Jeffrey D. Ullman

Overseas reprint version. Paperback. released in China. Contents in ENGLISH and absolutely comparable as US version.

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Extra resources for A First Course in Database Systems (3rd Edition)

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The following example illustrates the use of a constant: 1. In a standard module, enter the following statement in the General Declarations area: Const conMessage As String = "Undeclared variable" 2. Print varValue End Function 3. With the insertion point somewhere inside ConstantTest(), press F5 to execute the procedure. Print statement prints the contents of the variable varValue, which refers to conMessage (the constant). 5. The varValue variable equals the constant named conMessage. Change the string expression in the Const statement to "Constant" and run the procedure again.

8 in the Immediate window. 7. Running the procedure opens an Access form. 8. The procedure displays a message in the Immediate window. [View full size image] Normally, you won't display values in the Immediate window. Instead, you'll use them in your code somehow. Part I: Laying the Foundation 33 34 Part I: Laying the Foundation For now, it's enough to see that you can display results in the Immediate window, which is a great way to debug your code. Saving the Code To save a new module or to save changes made to an existing module, click the Save tool on the Standard toolbar or choose File, Save project.

9. Be sure to save a new module. CAUTION You can close the VBE without losing unsaved code, although it isn't advisable. However, once you close a module any unsaved code is lost. 10. ) It's also worth noting that highlighting the new module (Chapter2) in the Project Explorer updates the contents of the Properties window. Currently, there are no properties to display other than the name of the module. You'll become accustomed to working with and even depending upon these windows. 10. Saving the module updates its name in the Project Explorer.

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