create qr code vb.net Part 4: Designing an Access Project in Visual Studio .NET

Encode Code-128 in Visual Studio .NET Part 4: Designing an Access Project

Part 4: Designing an Access Project
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Figure 18-22. Selecting the columns to which the stored procedure will append values.
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Now you need to specify the values that you want to append to the tblCompanies table. You could simply enter values in the New Value field for each column and execute the stored procedure. However, the next time you wanted to add a row to the Companies table, you would have to build the procedure all over again. Instead, you can use parameters for each value. When you do this, Access prompts you for the values you want to insert into a new row each time you run the stored procedure. You can also execute the stored procedure from Visual Basic code and supply the column values by setting the parameters. To make each new value a parameter, you need to enter a valid parameter name next to each column name. Remember, a parameter name must begin with the @ character and cannot contain blanks or special characters other than the underscore character. Refer to the list below for suggested parameter names for each column name. Column Name
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CompanyName Department Address
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@CompanyName @Department @Address
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Building Queries in an Access Project Column Name
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City County StateOrProvince PostalCode Country PhoneNumber FaxNumber Website ReferredBy
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Parameter Name
@City @County @StateOrProvince @PostalCode @Country @PhoneNumber @FaxNumber CAST(@Website AS nvarchar(50)) @ReferredBy
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Notice that you must convert (CAST) the @Website parameter to an nvarchar data type because the data type of the Website column is ntext, and the query designer doesn t accept a parameter for an ntext data type column. Converting the parameter to an nvarchar data type allows the parameter to be used to append data to the Website column. Interestingly, when you enter this parameter, Access displays a dialog box telling you that the conversion might be unnecessary. However, if you attempt to enter a simple parameter name, Access tells you that this produces a data type conversion error and won t let you leave the New Value box until you correct it. After you enter all the parameter names, the stored procedure is complete. Click the Save button on the toolbar and name the procedure spAddOneCompany. Your finished stored procedure should look like Figure 18-23. You can also find this query saved as spXmplAddOneCompany in the sample database.
Figure 18-23. The completed spAddOneCompany stored procedure.
Part 4: Designing an Access Project
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Part 00: Part Title
Microsoft Office Access 2003 Inside Out You can see the stored procedure in action by clicking the View button or the Run button on the toolbar. Access prompts you for each of the parameter values in succession. Input a value for each parameter and click OK, but only the CompanyName field is required to successfully save a new row. (The ReferredBy parameter is an integer value that identifies the ContactID of the person who referred this company. Enter a valid ContactID or leave the value blank.) When the procedure is complete, you receive a message stating that the procedure completed successfully but didn t return any records. Now open the tblCompanies table in Datasheet view. Notice that the information you provided appears as a new row in the table. Caution
When working with action queries in an Access desktop database (.mdb), you can switch to Datasheet view and see a recordset that represents the potential changes to the data. The desktop database action query doesn t actually execute until you click the Run button. This is not the case with stored procedures in the query designer in a project file (.adp). Viewing a stored procedure is the same as executing it. Be careful how you build your action queries and always test them on a backup copy of your tables before executing them against your production tables.
Part 4: Designing an Access Project
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Before moving on to text queries, let s take a look at the properties for a stored procedure. Because the stored procedure you ve been building is an append query, you won t be able to see all the available properties for a stored procedure in the Properties window for your query. Open the sample spXmplCompanyParameter query in Design view this is a simple stored procedure on the tblCompanies table that uses a parameter to filter the CompanyName column. As before, you can view the properties for a stored procedure by right-clicking anywhere in the design area and selecting Properties from the shortcut menu. Access displays the Properties window for the stored procedure, as shown in Figure 18-24.
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