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Listing 3-10 shows inserting a single record into the table with values that are literally typed into the statement (this is sometimes referred to as hard coded). Of course, it will be more useful to create a routine where you can customize the Insert statement so that you can fill in whatever values are needed as you go. The code in Listing 3-11 shows a subroutine that you can create and call that has parameters for the columns in the TestResults table. Listing 3-11. A Subroutine for Customizing TestResults Values VB .NET Sub TestLog(ByVal tid As Integer, ByVal testdate As Date, _ ByVal reqmt As String, _ ByVal Tester As String, ByVal result As Boolean) Dim cnTestResults As New OleDbConnection( _ "Provider=Microsoft.jet.oledb.4.0;Data Source=TestResultsDB.mdb") Dim iRet As Integer cnTestResults.Open() Dim cmd As New OleDbCommand( _ "Insert into TestResults (TestID, TestDate, Reqmt, Tester, Result) tid & ", '" & testdate & "', '" & reqmt & "', '" & _ Tester & "', " & result & ")", cnTestResults) iRet = cmd.ExecuteNonQuery cnTestResults.Close() End Sub
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CHAPTER 3 THE BASICS OF STORING TEST DATA
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C# void TestLog(int tid, System.DateTime testdate, string reqmt, string Tester, bool result) { OleDbConnection cnTestResults = new OleDbConnection( "Provider=Microsoft.jet.oledb.4.0;Data Source=TestResultsDB.mdb"); int iRet; cnTestResults.Open(); OleDbCommand cmd = new OleDbCommand( "Insert into TestResults (TestID, TestDate, Reqmt, Tester, Result) Values (" + tid + ", '" + testdate + "', '" + reqmt + "', '" + Tester + "', " + result + ")", cnTestResults); iRet = cmd.ExecuteNonQuery(); cnTestResults.Close(); } This is the first time you ve created your own subroutine in this book. Subroutines provide a way to reuse code, rather than retype, or copy and paste, the same statements over and over. You can type it in once and then call it multiple times. Notice that the methods to create, open, and close the connection are contained within this subroutine. That means that each time you write a test result, you ll be opening and closing the connection, which creates extra IO. It also means that if the system breaks while you re running your test, you ll have less chance of a corrupted test results file since you ll have closed it immediately after writing to it. The Insert statement in this code has been modified to include the parameters that will be provided for the subroutine by catenating the values into the command. Although this makes the command look a little more obscure, when the code executes this Insert statement, it will be essentially the same as the one you used in Listing 3-10. It s just customized so that it s able to insert any values you choose when you call the routine. You ll put this routine to good use in the next exercise. Exercise 3-3 shows you how to open a Microsoft Access database, execute and test a stored query (called a View in database terminology) in the database, and then store test results in a database table with a subroutine.
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Exercise 3-3: Writing Test Results to a Database
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In this exercise, you ll perform some simple database-focused testing using a Microsoft Access database. You ll be testing a query on the database to ensure that it s returning the correct number of rows. This is similar to a project we participated in where the object of the tests was to ensure the proper functioning of critical queries. Some of these tests include ensuring correct rowcount. You ll simulate that here in this exercise.
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Note It s not necessary to have Microsoft Access installed to accomplish this exercise.
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THE BASICS OF STORING TEST DATA
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1. Launch Visual Studio .NET and open the DatabaseTest1Template solution from within the 3\ VB\Exercise3-3\DatabaseTest1Template folder (or replace the VB with C#). This template does not have any prewritten code, but does contain the Microsoft Access database, TestResultsDB.mdb, that you will access for this exercise. To see this database file, open the Solution Explorer window and select the All Files button. If you have Microsoft Access installed, you can double-click on this file and Microsoft Access will launch and you can view the two tables, Customers and TestResults, within this database. (Note that although it s not necessary for you to have Microsoft Access installed to perform this exercise, it is required if you want to open the database and view it by double-clicking it. You do not need to view it.) 2. Add a button control to the form in any location you like. Change the form properties and button properties according to Table 3-3.
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