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Imports System
Imports System.Data
Imports System.Data.SqlClient
public class MainClass
Shared Sub Main()
Dim thisConnection As New SqlConnection("server=(local)\SQLEXPRESS;" & _
"integrated security=sspi;database=MyDatabase")
' Sql Select Query
Dim sql As String = "SELECT * FROM Employee"
' Sql Update Statement
Dim updateSql As String = _
"UPDATE Employee " & _
"SET FirstName = @FirstName " & _
"WHERE ID = @ID"
Try
' Create Data Adapter
Dim da As New SqlDataAdapter
da.SelectCommand = New SqlCommand(sql, thisConnection)
' Create and fill Dataset
Dim ds As New DataSet
da.Fill(ds, "Employee")
' Get the Data Table
Dim dt As DataTable = ds.Tables("Employee")
' Display Rows Before Changed
Console.WriteLine("Before altering the dataset")
For Each row As DataRow In dt.Rows
Console.WriteLine("{0} | {1} | {2}", _
row("ID").ToString().PadRight(10), _
row("FirstName").ToString().PadRight(10), _
row("LastName"))
Next
' Modify city in first row
dt.Rows(0)("FirstName") = "Ham"
' Update Employees
' 1. Create Command
Dim UpdateCmd As New SqlCommand(updateSql, thisConnection)
' 2. Map Parameters
' 2.1 City
UpdateCmd.Parameters.Add("@FirstName", _
SqlDbType.NVarChar, 15, "FirstName")
' 2.2 EmployeeId
Dim idParam As SqlParameter = _
UpdateCmd.Parameters.Add("@ID", _
SqlDbType.Int, 4, "ID")
idParam.SourceVersion = DataRowVersion.Original
' Update employees
da.UpdateCommand = UpdateCmd
da.Update(ds, "Employee")
' Display Rows After Alteration
Console.WriteLine("=========")
Console.WriteLine("After altering the dataset")
For Each row As DataRow In dt.Rows
Console.WriteLine("{0} | {1} | {2}", _
row("ID").ToString().PadRight(10), _
row("FirstName").ToString().PadRight(10), _
row("LastName"))
Next
Catch ex As SqlException
' Display error
Console.WriteLine("Error: " & ex.ToString())
Finally
' Close Connection
thisConnection.Close()
Console.WriteLine("Connection Closed")
End Try
End Sub
End Class
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