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The code for t he Populat e procedure assum es t he exist ence of an I m por t s st at em ent at t he t op of t he m odule for t he Sy st em .Dat a.SqlClient nam espace.
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I t s com m on t o describe t he Dat aAdapt er as a bridge bet ween a r em ot e dat a source and t he dat a set behind a form . Ther efor e, t he Populat e pr ocedure st art s by declaring a Connect ion obj ect , cnn1. The cnn1 obj ect r efer ence point s t o t he Nort hwind dat abase on t he local inst ance of SQL Serv er . Next t he pr ocedur e declares and inst ant iat es a Com m and obj ect , cm d1. A SQL st r ing specifies t he Cat egoryI D, Cat egory Nam e, and Descript ion colum ns fr om t he Cat egor ies t ables t o designat e t he r esult set from cm d1. The Com m and obj ect cm d1 links t o t he Cat egor ies t able t hrough t he Connect ion obj ect cnn1. Aft er indir ect ly specify ing t he Com m andText pr opert y for a Com m and obj ect , t he procedur e inst ant iat es a Dat aAdapt er obj ect and uses t he dap1 obj ect r eference t o point t o it . I n order for t he dap1 Dat aAdapt er t o fill t he dat a set behind t he form , t wo condit ions m ust hold. First , t he Dat aAdapt er needs a Com m and obj ect assigned t o it s Select Com m and propert y . Assigning cm d1 t o t he Select Com m and propert y of dap1 sat isfies t his condit ion. Second, t he Dat aAdapt er requires an open connect ion t o t he Cat egor ies t able in t he Nort hwind dat abase. I nvoking t he Open m et hod for t he cnn1 obj ect m eet s t his requirem ent . Aft er m eet ing t hese t w o condit ions, t he procedure invokes t he Fill m et hod for dap1. The argum ent s for t he m et hod in t he pr ocedur e designat e Cat egor ies as t he nam e of t he Dat aTable obj ect t hat holds t he result set from cm d1 in t he das1 dat a set . The m odule behind Form 4 declar es and inst ant iat es das1 as a dat a set at t he m odule level. This m ak es t he das1 dat a set available for use in all t he pr ocedur es behind a for m . Of course, it also m eans t hat y ou cannot see t he declarat ion in t he list ing for t he Populat e pr ocedur e. For y our easy refer ence, I include t he st at em ent declaring and inst ant iat ing das1 j ust before t he list ing for t he Populat e procedure. Not ice t hat t he Populat e procedure concludes by closing t he Connect ion obj ect cnn1. I n cont rast t o t he Dat aReader obj ect , t he dat a set obj ect operat es while disconnect ed fr om a r em ot e dat a source. Recall t hat t his abilit y t o oper at e w hile disconnect ed adds t o t he scalabilit y of Visual Basic .NET applicat ions for SQL Ser ver. Module-level declaration of data set object. Dim das1 As DataSet = New DataSet() Sub Populate() Specify a connection for a data adapter that fills the data set used on the form. Dim cnn1 As SqlConnection = _ New SqlConnection _ ( Data Source=(local); & _ Integrated Security=SSPI; & _ Initial Catalog=northwind ) Specify the command and data adapter that serves as the source for the data set on the form. Dim cmd1 As SqlCommand = _
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New SqlCommand _ ( SELECT CategoryID, CategoryName, Description & _ FROM Categories", _ cnn1) Dim dap1 As SqlDataAdapter = New SqlDataAdapter() dap1.SelectCommand = cmd1 cnn1.Open() Fill the data set (das1) with the data adapter dap1; the Fill method populates the data set with a table named Categories. dap1.Fill(das1, Categories ) Close the connection because a data set is a disconnected data source. cnn1.Close() End Sub
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