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The second procedure, InsertWithSQL, performs the database modification tasks via a Command object with SQL statements and synchronizes the two database tables with the two local, disconnected data sources that map to them The Button4_Click procedure starts by creating the DotNetTable2 database table The procedure implementing this object is shown next Initially, the code drops any prior table in the database pointed at by the cnn1 SqlConnection object If the table doesn t already exist, the Try Catch Finally statement displays an error message about that fact Next, the code excerpt runs the SQL statement for creating the DotNetTable2 database table The CREATE TABLE statement for the DotNetTable2 database table designates three columns and a primary key constraint The SalesID and ContactID columns jointly define the primary key that makes each row in the table unique.

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Imports System Imports System.Data Imports System.Data.OleDB Module Module1 Sub Main() ' Set up connection string Dim connString As String = _ "provider = sqloledb;" _ & "data source = .\sqlexpress;" _ & "integrated security = sspi;" _ & "initial catalog = northwind"

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The Amount column stores information about the amount of a transaction defined by the combination of SalesID and ContactID column values The ContactID column from the DotNetTable2 database table contains values that should link back to a row in the DotNetTable database table The primary key constraint specifies that rows must be unique by the combination of their SalesID and ContactID column values Dim cmd1 As New SqlCommand cmd1CommandText = "DROP TABLE DotNetTable2" cmd1Connection = cnn1 Try cnn1Open() cmd1ExecuteNonQuery() Catch ex As Exception MessageBoxShow(exMessage) Finally cnn1Close() End Try cmd1CommandText = "CREATE TABLE DotNetTable2 (" & _ "SalesID int NOT NULL, " & _ "ContactID int NOT NULL, " & _ "Amount dec(7,2) NOT NULL," & _ "CONSTRAINT PK_TwoIDs PRIMARY KEY(SalesID, ContactID))" cmd1Connection = cnn1 Try cnn1Open() cmd1ExecuteNonQuery() Catch ex As Exception MessageBoxShow(exMessage) Finally cnn1.

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' Set up query string Dim sql As String = _ "select " _ & " * " _ & "from " _ & " employees" ' Declare connection and data reader variables Dim conn As OleDbConnection = Nothing Dim rdr As OleDbDataReader = Nothing Try ' Open connection conn = New OleDbConnection(connString) conn.Open() ' Execute query Dim cmd As OleDbCommand = New OleDbCommand(sql, conn) rdr = cmd.ExecuteReader() ' Display output header Console.WriteLine( _ "This program demonstrates the use of " _ & "the OLE DB Data Provider." _ & ControlChars.NewLine _ ) Console.WriteLine("First Name Last Name") ' Process result set While rdr.Read Console.WriteLine( _ "{0} | {1}" _ , rdr("firstname").ToString().PadLeft(10) _ , rdr(1).ToString().PadLeft(10) _ ) End While Catch e As Exception Console.WriteLine("Error: " & e.ToString) Finally ' Close connection

You can use CTEs to organize and isolate query logic in order to write complicated queries efficiently. You cannot nest CTEs; that is, one CTE cannot contain another CTE. You can, however, add multiple CTEs to one query. You might want to do this just to make your query more readable or possibly because writing the query this way will let you avoid creating temp tables or views. Here is the syntax:

Close() End Try After creating the DotNetTable2 database table, the Button4_Click procedure creates a DataTable in the client application based on the database table The name of the local DataTable mapping to the DotNetTable2 database table is Table2 The Table2 DataTable is a local data cache for the DotNetTable2 database table in the same sense that the Table DataTable is a local cache for the DotNetTable dap2 = New SqlDataAdapter("SELECT * FROM DotNetTable2", cnn1) dap2Fill(das1, "Table2").

2. Since you now have two projects in your solution, you need to make this project the startup project so it runs when you press Ctrl+F5. Right-click the project name in Solution Explorer, and then click Set As StartUp Project. 3. Run the application by pressing Ctrl+F5. The results should appear as in Figure 4-7.

The final line in the Button4_Click procedure calls the InsertWithSQL procedure It is this second procedure that performs inserts for the DotNetTable and DotNetTable2 database tables The InsertWithSQL procedure also synchronizes the Table and Table2 DataTable objects with their corresponding database tables The following excerpt from the InsertWithSQL procedure shows the syntax for populating the DotNetTable database table with values and synchronizing the updated database table with the first DataTable in the das1 DataSet The code segment demonstrates the use of parameters in an INSERT statement: You must reference the parameters in the INSERT statement for the SqlCommand object You must add the named parameters to the Parameters collection for the SqlCommand object Use the Add method for the Parameters collection of a SqlCommand object to add a new parameter to the collection.

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