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Table 3-3. Properties to Set for the Form and the Button on the DatabaseTest1 Project
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Button1 Form Form Form
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Text Text AcceptButton Name
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Run Test Database1 Test bed Button1 frmTestBed
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3. Now open the code window for the form by right-clicking on the form in the Windows Designer. Import the System.Data.OleDb namespace into the code by typing the following line at the top of your code window (in the usual location): VB .NET Imports System.Data.OleDb C# using System.Data.OleDb; If you get a squiggly line underneath VB .NET s Imports statement, this means you will have to set a reference to this library in your code. At this writing, the VB .NET Beta Express edition does not reference the System.Data library while the C# Beta Express does, and so do all languages within Visual Studio 2005. So do the following ONLY if you get the squiggly line or have problems getting to this library: a. Select Project Add Reference from the main menu. The Add Reference dialog box will display. b. In the .NET tab, scroll down in the Components list box until you find the System.Data line. Click this line to select it. c. Click OK to dismiss the dialog box. You have now set a reference to the correct library. 4. Now type in the code in Listing 3-11 to create a new subroutine. To make sure you type it in the correct spot, place it in the same location as can be seen in Listing 3-12.
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CHAPTER 3 THE BASICS OF STORING TEST DATA
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Listing 3-12. Creating a TestLog Subroutine VB .NET Public Class frmTestBed 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) " & _ "Values (" & tid & ", '" & testdate & "', '" & _ reqmt & "', '" & Tester & "', " & result & ")", _ cnTestResults) iRet = cmd.ExecuteNonQuery cnTestResults.Close() End Sub End Class C# namespace DatabaseTest1 { partial class frmTestBed : Form { 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"); DatabaseTest1; 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(); }
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THE BASICS OF STORING TEST DATA
public frmTestBed() { InitializeComponent(); } } } At this point, you can build your project to check your syntax, but of course, nothing will happen if you run the program and click the button because you need to include a call to this subroutine in order for it to execute. You ll do that in step 5 by adding code to the button s Click event. 5. Return to the Designer window and double-click on the button control to add an event handler for the button s Click event. Add the following code to the button s Click event: VB .NET Dim cn As New OleDbConnection( _ "Provider=Microsoft.jet.oledb.4.0;Data Source=TestResultsDB.mdb") Dim iRet1, iret2 As Integer cn.Open() Dim cmd As New OleDbCommand("select count(*) from contactList", cn) iRet1 = cmd.ExecuteScalar cmd.CommandText = "select count(*) from customers" iret2 = cmd.ExecuteScalar C# OleDbConnection cn = new OleDbConnection( "Provider=Microsoft.jet.oledb.4.0;Data Source=TestResultsDB.mdb"); int iRet1; int iret2; cn.Open(); OleDbCommand cmd = new OleDbCommand( "select count(*) from contactList", cn); iRet1 = Convert.ToInt16(cmd.ExecuteScalar()); cmd.CommandText = "select count(*) from customers"; iret2 = Convert.ToInt16(cmd.ExecuteScalar()); The first code statement creates the Connection object that you ll use to send statements to the database. Notice that it s a separate connection from the one you use in the subroutine to log the test results. It is possible to have many connections to the same database and connections to other databases open at the same time. While you could accomplish this whole thing with one connection, it keeps things easier to manage and clearer to have two in this case. This is a strategy that is up to you as the coder though. Fewer connections may sometimes be optimal. The next line of code declares two integer variables, and the next line opens the connection. After that, the following two lines, shown again here, create and execute a SQL statement that will be sent to the database. Don t retype these lines, we just want you to focus on them:
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