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CHAPTER 2 FIRST WORKFLOW
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that folder, find the appropriate CreateTable file (either 2000 or 2005) for your SQL Server and execute that file on the database. This creates the table tblPurchaseOrders. Within the SQL folder in the 2 folder, you ll also find a VB file called SQLDBAccess.vb. You ll use this file throughout the book to provide data access code, so you don t need to re-create that code in each chapter. If you re unfamiliar with OOP concepts, this is a class file, and will be used as a class. By using this file as a class, you can access its functionality many times. Create a new VB Sequential Workflow Console Application called VBPurchaseOrderConsole. You ll also find this application already completed in the 2\VBPurchaseOrderApplication folder. Change the name of the workflow file (workflow1.vb) to PurchaseOrderProcess.vb. Right-click the workflow and add the following private variables to be used by the public properties (which will receive the parameters): Private Private Private Private Private Private Private StrPurchaseOrderNumber as string StrPartNumber as string DtePurchaseDate As Date DteExpectedDate As Date StrBuyerLogin As String StrBuyerName As String IntQuantityOrdered As Integer
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Notice the received fields aren t included. The reason for this is that right now you re only dealing with adding a purchase order. Eventually you ll deal with what happened when a purchase order is received. After adding the private variables, add the following public properties that will receive the parmater values: Public WriteOnly Property PartNumber() as String Set(ByVal value as String) StrPartNumber=value End Set End Property Public WriteOnly Property PurchaseDate() As Date Set(ByVal value As Date) DtePurchaseDate = value End Set End Property Public WriteOnly Property ExpectedDate() As Date Set(ByVal value As Date) DteExpectedDate = value End Set End Property Public WriteOnly Property BuyerLogin() As String Set(ByVal value As String) StrBuyerName = value End Set End Property Public WriteOnly Property BuyerName() As String Set(ByVal value As String) StrBuyerName = value
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CHAPTER 2 FIRST WORKFLOW
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End Set End Property Public WriteOnly Property QuantityOrdered() As Integer Set(ByVal value As Integer) IntQuantityOrdered = value End Set End Property Note in the preceding public properties that Purchase Order Number isn t present. The reason for this is that the system will generate the next purchase order number. The workflow will return that purchase order number. To do this, you need to add a read-only public property: Public ReadOnly Property PurchaseOrderNumber() As String Get Return StrPurchaseOrderNumber End Get End Property Now that you ve defined the private variables and public properties, it s time to add the SQLDBAccess.vb file. To do this, right-click the project in the Solution Explorer and choose Add, then Existing Item. Navigate to the 2\SQL folder within the code folder and select SQLDBAccess.vb. To allow your workflow to use this class, add a line of code to the end of where the private variables are created: Private clsDB as SQLAccess The next step is to add the code to Sub Main to prompt for, accept, and pass the input parameters. Open the Module1.vb file and add the following code immediately within the Sub Main declaration: Dim Parameters As New Dictionary(Of String, Object) This declares a variable called Parameters that s of type Dictionary, which holds a list of strings. We do have variables that are string, date, and integer, but the string variables can be converted easily to the other types. Next, add the following lines, first to prompt for, and then to read the values into the parameters: Console.Write("("Enter the Part Number")") Parameters.Add("("PartNumber",",Console.ReadLine) Console.Write("Enter the Purchase Date:") Parameters.Add("PurchaseDate", Cdate(Console.ReadLine)) Console.Write("Enter the Expected Date:") Parameters.Add("ExpectedDate", Cdate(Console.ReadLine)) Console.Write("Enter the Buyer Login:") Parameters.Add("BuyerLogin", Console.ReadLine) Console.Write("Enter the Buyer Name:") Parameters.Add("BuyerName", Console.ReadLine) Console.Write("Enter the Quantity Ordered:") Parameters.Add("QuantityOrdered", Cint(Console.ReadLine))
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