barcode printing in vb net Interacting with Databases in VS .NET

Painting Denso QR Bar Code in VS .NET Interacting with Databases

Interacting with Databases
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The cmdselect is used to call the Addwithvalue() method of the Parameters class, passing it two parameters The first parameter is the name of the parameter that you are adding to the parameter collection The second parameter is the value that is associated with the parameter In the preceding example, the value called txtCustFirstNameText is the text of the txtCustFirstName textbox that appears on your web page You use QCustFirstName in your query just as if @CustFirstName were an explicit value You can specify the data type and maximum number of characters that can be accepted by the system by modifying the call to Addwithvalue() Here's how this is done:
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You'll notice that the Addwithvalue() method takes on a slightly different form than the preceding example The first argument is the name of the parameter The second argument is the data type of the parameter The data type is automatically chosen for you if you exclude the data type as was done in the preceding example The data type must reflect the namespace that is associated with the DBMS SqlDbType is used for the SqlDb namespace, which is for Microsoft SQL Server The OleDbType is used for Microsoft Access Namespaces for other DBMSs have similar data type names The third argument is the maximum number of characters that can be assigned to the parameter In this example the customer first name can have up to 25 characters If you exclude the size parameter, then the maximum size is automatically determined by the value of the parameter Here's the full code for Microsoft SQL Server:
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<%@ Import Namespa~e=~~SysternData~l %> <%@ Import Name~pace=~~SystemDataSqlClient" %>
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<Script Runat="Serverm> Sub Button-Click( s As Object, e As EventArgs ) Dim custDb As SqlConnection Dim cmdSelectCustomers As SqlCommand Dim dtrcustomers As SqlDataReader custDb = New SqlConnection(11Server=localhost;uid=myID;pwd=mypassword; database=customern) cmdSelectCustomers = New SqlCommand(ItSelect custFirstName, custLastName From ~~, custcontact Where c u ~ t N u m b e r = @ C u s t N u m b e rcustDb) cmdSelectCustomersParametersAddWithValue ( "@CustNumberI1, txtCustNumberText ) custDb Open( ) dtrcustomers = cmdSelectCustomersExecuteReader() While dtrCustomersRead() txtCustFirstNarne-text = dtrCustomers( "custFirstNameM ) txtCustLastNametext = dtrCustomers( llcustLastNamen) End While dtrCustomersClose() custDbClose ( ) End Sub </Script >
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cform Runat=I1ServerN > cbzcustorner Number:</b> <br> <asp:TextBox ID=lltxtCustNumberM Runat=I1Serverl1> / <P> <asp:Button Text=I1Locatel1 OnClick="Button-Clickn Runat="Servern / > <P> cbzcustomer First Name:</b> <br> / <asp:TextBox ID=utxtCustFirstName" Runat=I1ServerH > <P> <b>Customer Last Name:</b> <br> Runat=I1Serverl1 s / <asp:TextBox ID=lltxtCustLastNameu <P> </form> </body> /html>
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This code prompts the web site visitor to enter a customer number into a textbox and select the Locate button to search the database for the name that is associated with the customer number Once the customer number is located, the DBMS returns the customer first name and customer last name, which are then displayed in textboxes on the form The code begins by defining a button click event handler for the Locate button You'll notice that the event handler contains nearly the same code that we discussed previously in this chapter However, there is one difference, in that we define and use the @CustNumber parameter The @CustNumberparameter has the text value that the visitor entered into the txtCustNumber textbox and is compared with the value of custNumber column of the table in the Where clause of the query After the query executes, the code copies the value of the custFirstName and custLastName columns to the corresponding textboxes that appear on the form The web page itself displays three textboxes, for the customer number and customer first and last names, as well as the Locate button Here is the Microsoft Access version of this application:
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Namespace="SystemDatau % > Import Namespace="SystemDataOleDb " % > <Script Runat="ServerM> Sub Button-Click( s As Object, e As EventArgs ) Dim custDb As OleDbConnection Dim cmdSelectCustomers As OleDbCommand Dim dtrcustomers As OleDbDataReader custDb = New OleDbConnection( 11PROVIDER=MicrosoftJet0LEDB40;Data Source=c: cust mdbI1 ) cmdSelectCustomers = New OleDbC~mmand(~~Select custFirstName, custLastName From ~~, custcontact Where c u s t N ~ m b e r = @ C u s t N u m b e rcustDb) crndSelectCustomersParametersAddWithValue ( ll@CustNumberll, txtCustNumberText
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