how to make qr code generator in vb.net Part 7: After Completing Your Application in VS .NET

Paint Code 128A in VS .NET Part 7: After Completing Your Application

Part 7: After Completing Your Application
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Upsizing a Desktop Application to a Project
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Open a recordset to see if any rows returned with this filter Set rst = DBEngine(0)(0).OpenRecordset( SELECT * & _ FROM tblContacts WHERE & varWhere) See if found none If rst.RecordCount = 0 Then MsgBox No Contacts meet your criteria. , vbInformation, gstrAppTitle Clean up recordset rst.Close Set rst = Nothing Exit Sub End If < code to open the filtered form removed > End Sub
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Now, here s the same code in Contacts2Upsize.mdb that I modified to use an ADO recordset and detect the application type to build a correct filter:
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Private Sub cmdSearch_Click() Dim varWhere As Variant, varDateSearch As Variant Dim strWild As String, strDateDelim As String, intMDB As Integer Dim frm As Form Use ADO recordset for upsizing Dim rst As New ADODB.Recordset Initialize to Null varWhere = Null varDateSearch = Null Find out the project type and set the wildcard and date delimiter If CurrentProject.ProjectType = acMDB Then strWild = * strDateDelim = # intMDB = True Else strWild = % strDateDelim = End If < code to perform initial validation removed > OK, start building the filter If specified a contact type value If Not IsNothing(Me.cmbContactType) Then .. build the predicate varWhere = "[ContactType] = " & Me.cmbContactType & " " End If Do Last Name next If Not IsNothing(Me.txtLastName) Then .. build the predicate
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Part 1: Part Title
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Part 7: After Completing Your Application
Microsoft Office Access 2003 Inside Out
Note: taking advantage of Null propogation so we don t have to test for any previous predicate varWhere = (varWhere + " AND ") & "[LastName] LIKE " & _ Me.txtLastName & strWild & " " End If < code to build some parts of the predicate removed> Do Contact date(s) next -- this is a toughie because we want to end up with one filter on the subquery table for both Contact Date range and FollowUp Date range Check Contact From first If Not IsNothing(Me.txtContactFrom) Then .. build the predicate varDateSearch = "tblContactEvents.ContactDateTime >= " & _ strDateDelim & _ Format(CDate(Me.txtContactFrom), "dd mmm yyyy") & strDateDelim End If <code to build remaining date/time predicates removed> Finally, do the Inactive check box If (Me.chkInactive = False) Then Build a filter to exclude inactive contacts varWhere = (varWhere + " AND ") & _ "(Inactive = 0)" End If Check to see that we built a filter If IsNothing(varWhere) Then MsgBox "You must enter at least one search criteria.", _ vbInformation, gstrAppTitle Exit Sub End If Open a recordset to see if any rows returned with this filter Must always use "%" wildcard in ADO recordset - even in an MDB rst.Open "SELECT * FROM tblContacts WHERE " & _ Replace(varWhere, "*", "%"), CurrentProject.Connection, _ adOpenKeyset, adLockOptimistic See if found none If rst.RecordCount = 0 Then MsgBox "No Contacts meet your criteria.", vbInformation, gstrAppTitle Clean up recordset rst.Close Set rst = Nothing Exit Sub End If < code to open the filtered form removed > End Sub
Part 1: Part Title
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Part 7: After Completing Your Application
Upsizing a Desktop Application to a Project Note When you re certain that your desktop database will always be a desktop database, you gain no advantage by using ADO to manipulate recordsets or objects. ADO has more overhead than DAO in a desktop database, and it supports only a subset of the functionality of DAO for JET databases. The modified code tests the ProjectType property of the CurrentProject object to find out whether it is running in a desktop database (acMDB) or in a converted project file. It sets the LIKE predicate wildcard and the date delimiter character accordingly. Note that the code in both procedures already uses single quotes to delimit string literals, so I didn t have to make any changes. When building a date/time predicate, the code uses the correct delimiter determined earlier and formats the date value in the universal dd mmm yyyy format (two-digit day, three-character month name abbreviation and four-digit year). Using this technique to format the date is also a good idea in any application that might run in a non-U.S. locale. Although JET SQL expects dates in the U.S. mm/dd/yyyy format, it also understands this universal format. If you insert a date directly from a control, an international user probably has used a dd/mm/yyyy format, which JET might misinterpret. Further down in the procedure, the code builds a predicate to test a yes/no value. The modified code uses the number 0 instead of the keyword False. Finally, the modified code opens an ADO recordset instead of a DAO recordset. It uses the Replace function to change any LIKE wildcards because ADO always expects % and _ instead of * and . The recordset object in both DAO and ADO supports the RecordCount property, so I didn t have to change the code to test for any records found. Note that you don t have to change any of your DAO code before you run the Upsizing Wizard. However, the new project file will not contain a reference to the DAO library, so your code won t compile in the converted database. One good way to locate all your DAO code is to remove the DAO library from the desktop database that you plan to convert. (Remember, you should be working in a backup copy of your original database!) Open any module in Design view and choose References from the Tools menu in the Visual Basic Editor (VBE) window. Clear the check box next to Microsoft DAO 3.x Object Library and click OK. Choose Compile from the Debug menu, and the compiler halts on any reference to a DAO object in your code.
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