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CHAPTER 8 CUSTOM ACTIVITIES
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Figure 8-6. ExecuteSQL is now available to be added to the Toolbox.
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Figure 8-7. Choose ConnString as the property.
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CHAPTER 8 CUSTOM ACTIVITIES
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The existing Code activity sets the SQLStatement property. Click the AddPurchaseOrder Code activity and change the name to PrepareInsert. Leave the ExecuteCode property as it is. View the code for the workflow and find the AddPurchaseOrder_ExecuteCode sub. Move the Select statement from the SQLInsertUpdate sub to the AddPurchaseOrder_ExecuteCode sub, and assign the Select statement to the SQLStatement property of the InsertPurchaseOrder activity with the following code: Private Sub AddPurchaseOrder_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs) InsertPurchaseOrder.SQLStatement = "Insert into tblPurchaseOrders " & _ (StrPartNumber,DtePurchaseDate,DteExpectedDate," & _ "StrBuyerLogin,StrBuyerName,IntQuantityOrdered) " & _ "values('" & StrPartNumber & "','" & DtePurchaseDate & "'," & _ "'" & DteExpectedDate & "','" & StrBuyerLogin & "'," & _ "'" & StrBuyerName & "'," & IntQuantityOrdered & ") Select @@Identity" End Sub This activity won t prepare the InsertPurchaseOrder activity to insert the necessary information. After the InsertPurchaseOrder activity is executed, another Code activity needs to be added to set up the purchase order number and update the purchase order number. The SQLInsertUpdate sub is doing all this work. View the Workflow Designer again, add a Code activity called GetPurchaseOrderNumber, and generate the Handlers for this activity. After the GetPurchaseOrderNumber activity, add another ExecuteSQL activity. Change the name to UpdatePurchaseOrderNumber and set the ConnectionString property, the same as was done with the previous ExecuteSQL activity. Your workflow should look like Figure 8-8.
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Figure 8-8. Updated PurchaseOrderProcess workflow Within the GetPurchaseOrderNumber generated sub, add the code that s used to determine the purchase order number, using the return value from the InsertPurchaseOrder activity:
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CHAPTER 8 CUSTOM ACTIVITIES
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Private Sub GetPurchaseOrderNumber_ExecuteCode (ByVal sender As System.Object, ByVal e As System.EventArgs) Dim IntPurchaseOrderID As Integer IntPurchaseOrderID = InsertPurchaseOrder.NewID Select Case IntPurchaseOrderID Case Is < 10 StrPurchaseOrderNumber = "00000" & IntPurchaseOrderID Case Is < 100 StrPurchaseOrderNumber = "0000" & IntPurchaseOrderID Case Is < 1000 StrPurchaseOrderNumber = "000" & IntPurchaseOrderID Case Is < 10000 StrPurchaseOrderNumber = "00" & IntPurchaseOrderID Case Is < 100000 StrPurchaseOrderNumber = "0" & IntPurchaseOrderID Case Else StrPurchaseOrderNumber = CStr(IntPurchaseOrderID) End Select UpdatePurchaseOrderNumber.SQLStatement = "Update tblpurchaseorders " & _ "set StrPurchaseOrderNumber='" & StrPurchaseOrderNumber & "' " & _ "where intpurchaseorderid = " & IntPurchaseOrderID End Sub You can now delete the SQLInsertUpdate sub. The additional activities will perform the Insert and the Update statements that were included in the code previously. The advantage of doing this is the activity that performs all the Execute commands and makes the connection to the database can be reused over and over again. You don t need to keep adding code to a Code activity to perform the command execution. Execute the workflow and provide all the requested information. The purchase order is added just as it was before, except now you re using the new custom activity ExecuteSQL instead of the code within the workflow.
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This chapter has covered the concept of custom activities, and also showed how to create two custom activities. You can add these custom activities to the Toolbox and use them for any new workflows you might want to create. This chapter concluded by adding the new ExecuteSQL custom activity to the Purchase Order Console application, and removing the code within the workflow that performed the work previously. The next chapter will show you how to deploy workflow applications.
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Deploying Workflow Applications
o far this book has covered the basics of workflow, all the out-of-the-box activities, and discussed designing workflows. Once a workflow application is constructed, it must be deployed. This chapter will cover how best to deploy a workflow application. This chapter will also cover how to persist workflow data so multiple users can use the same workflow.
Deployment Options
There are several options for deploying a workflow application. The deployment option you choose depends on the application and its process. If only one person will use the workflow application, which probably will be rare, or if the workflow application can stand alone, you can install the application on the client. If the workflow is to be used by the same application in various places and cannot stand alone, there are two options. You can install the workflow on a server and use .NET remoting to the workflow, or you can create the workflow as a Web service. If you re using an ASP.NET application, the workflow will be installed on the Web server. All the installations mentioned in the previous section require at least one prerequisite. The basic prerequisite is that the .NET Framework 3.0 must be installed on the workstation or server from which the workflow application is to be run. If you plan to create your workflow application as a Web service or use an ASP.NET application and workflow, the Framework must be installed on the Web server. If you plan to have the workflow on the client, then the Framework must be installed on the client. As with previous .NET Framework versions, installing .NET Framework 3.0 requires administrator rights. The simplest installation is just to take the executable file and load it on a client or server. Within the workflow folder that was created back in 2, add a folder called 9. Create a new VB Sequential Workflow Console Application called VBSimpleDeployment in the 9 folder. Add a single Code activity to the workflow and leave the name the default. Click Generate Handlers for the Code activity, and within the code Handler add msgbox("I'm here"). Build the solution and execute the workflow from within VS. You ll see a simple application that opens a console window, and the message box will appear. The most simple installation is just to copy the executable file. You can find the executable file within a folder in the bin folder of the project. The bin folder contains either a debug folder or a release folder, depending on how you built the solution. By default, when you build a solution a debug folder is created and the executable file is put in there. However, you can change the
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