By Denise M. Gosnell
This publication provide you with the instruments and strategies you will need so that it will construct extra subtle suggestions. After jogging during the good points of entry 2007 VBA, you will examine all approximately object-oriented programming and ADO. you are going to then growth to complicated VBA recommendations resembling operating with exterior DLLs and utilizing automation to regulate exterior courses. Plus, finished case reports provides you with the hands-on event in development real-world ideas utilizing the strategies lined within the booklet.
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It doesn't matter what DBMS you're using—Oracle, DB2, SQL Server, MySQL, PostgreSQL—misunderstandings can constantly come up over the best meanings of phrases, misunderstandings which can have a major impression at the good fortune of your database tasks. for instance, listed below are a few universal database phrases: characteristic, BCNF, consistency, denormalization, predicate, repeating staff, subscribe to dependency.
Extra resources for Beginning Access 2007 VBA
25 value is displayed in the Immediate Window. How It Works The CalculateSalesTax function has a declaration containing two variables as parameters. It uses Currency as the return data type. Function CalculateSalesTax(curPrice As Currency, dblTaxRate As Double) As Currency A variable is declared to store the calculated tax value. 'declare variable for storing calculated tax Dim curTaxAmt As Currency The amount of tax is calculated by multiplying the curPrice value by the dblTaxRate value. 'calculate amt of tax based on price and rate curTaxAmt = curPrice * dblTaxRate Because the procedure is a function procedure, a particular value should be returned.
As discussed in detail in Chapter 4, events occur in response to an action taken by the user or the system. Recall that earlier I discussed the two types of modules: standard modules and class modules. The code examples you have written so far were written in the standard module called modBusinessLogic. You will now write code in a class module associated with a particular form. Chapter 2: The Basics of Writing and Testing VBA Code 37 38 Chapter 2: The Basics of Writing and Testing VBA Code Creating a Procedure for an Object Using the Code Builder The first time you write code for a class module of a particular form or report, you must generate the empty procedure using the Code Builder.
But you will be writing code in the new database throughout the rest of this chapter to illustrate various coding concepts. Creating and Calling Procedures Now that you have a sample database, I return to a discussion of modules and procedures. You already saw a procedure inside the sample module illustrations provided previously, but let’s now analyze what the procedures are and how they can be used. Procedures are the building blocks of modules. Each module contains one or more sub procedures or functions, and each sub procedure or function contains one or more VBA code statements.