Tài liệu Creating SQL Server Objects with ActiveX Data Objects ppt

Creating SQL Server Objects with ActiveX Data Objects It is worthwhile to mention an example of creating a new table object with fields and primary key specified, even though the majorit

Creating SQL Server Objects with ActiveX Data Objects

It is worthwhile to mention an example of creating a new table object with fields and primary key specified, even though the majority of the work of creating objects using ADO and SQL Server is done in the T-SQL Statement that you create You will execute this statement using the Command object, as shown in Listing A.10

Listing A.10 basStoredProcedureExamples.vb: Creating SQL Server Objects with ADO and T-SQL

Sub CreatingASQLServerObjectFromADO(ByVal txtResults As TextBox)

Dim cnn As New ADODB.Connection()

Dim cmd As New ADODB.Command()

Dim prm As ADODB.Parameter

Dim rstOld As New ADODB.Recordset()

Dim rstNew As New ADODB.Recordset()

' In NET, we can assign values as we declare variables

' This is where the hard work is

Dim strSQL As String = "CREATE TABLE Test (PrimaryIntFld Integer

IDENTITY(1,1) PRIMARY KEY, Field2 Text)"

' Open the connection

OpenNorthwindADOConnection(cnn)

' Set up the Command object to use the SQL string

cmd.ActiveConnection = cnn

cmd.CommandText = strSQL

cmd.CommandType = ADODB.CommandTypeEnum.adCmdText

' Execute the command

cmd.Execute()

End Sub

This routine is a lot like the previous example except for the SQL statement and the fact that results aren't displayed You can see the results by going to the Visual Studio NET Server Explorer, zeroing in on the tables for the Northwind database, and opening the new Test table in Design mode, as shown in Figure A.7

Figure A.7 Creating objects such as this table is just a matter of learning the

correct SQL syntax

Note

If you already had the tables displayed for Northwind, you might need to right-click on the Tables node and choose Refresh