Query Processor: Execute SQL command and display result in Grid
Imports System
Imports System.Data
Imports System.Windows.Forms
Imports System.Data.SqlClient
public class MainClass
Shared Sub Main()
Dim form1 As Form = New Form1
Application.Run(form1)
End Sub
End Class
Public Class Form1
Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents Label2 As System.Windows.Forms.Label
Friend WithEvents SqlConnection1 As System.Data.SqlClient.SqlConnection
Friend WithEvents ExecuteButton As System.Windows.Forms.Button
Friend WithEvents SqlStatement As System.Windows.Forms.TextBox
Friend WithEvents ResultBox As System.Windows.Forms.ListView
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.Label1 = New System.Windows.Forms.Label
Me.Label2 = New System.Windows.Forms.Label
Me.ExecuteButton = New System.Windows.Forms.Button
Me.SqlStatement = New System.Windows.Forms.TextBox
Me.ResultBox = New System.Windows.Forms.ListView
Me.SqlConnection1 = New System.Data.SqlClient.SqlConnection
Me.SuspendLayout()
'
'Label1
'
Me.Label1.Location = New System.Drawing.Point(112, 8)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(272, 23)
Me.Label1.TabIndex = 0
Me.Label1.Text = "Type a SQL Query below and press Go to execute it"
'
'Label2
'
Me.Label2.Location = New System.Drawing.Point(136, 192)
Me.Label2.Name = "Label2"
Me.Label2.Size = New System.Drawing.Size(224, 16)
Me.Label2.TabIndex = 1
Me.Label2.Text = "The data matching your query is as follows"
'
'ExecuteButton
'
Me.ExecuteButton.Location = New System.Drawing.Point(200, 152)
Me.ExecuteButton.Name = "ExecuteButton"
Me.ExecuteButton.TabIndex = 2
Me.ExecuteButton.Text = "Go"
'
'SqlStatement
'
Me.SqlStatement.Location = New System.Drawing.Point(16, 32)
Me.SqlStatement.Multiline = True
Me.SqlStatement.Name = "SqlStatement"
Me.SqlStatement.Size = New System.Drawing.Size(464, 104)
Me.SqlStatement.TabIndex = 3
Me.SqlStatement.Text = ""
'
'ResultBox
'
Me.ResultBox.GridLines = True
Me.ResultBox.Location = New System.Drawing.Point(16, 216)
Me.ResultBox.Name = "ResultBox"
Me.ResultBox.Size = New System.Drawing.Size(464, 152)
Me.ResultBox.TabIndex = 4
Me.ResultBox.View = System.Windows.Forms.View.Details
'
'SqlConnection1
'
Me.SqlConnection1.ConnectionString = "server=(local)\SQLEXPRESS;" & _
"integrated security=sspi;" & _
"database=MyDatabase"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(496, 373)
Me.Controls.Add(Me.ResultBox)
Me.Controls.Add(Me.SqlStatement)
Me.Controls.Add(Me.ExecuteButton)
Me.Controls.Add(Me.Label2)
Me.Controls.Add(Me.Label1)
Me.Name = "Form1"
Me.Text = "QueryProcessor"
Me.ResumeLayout(False)
End Sub
#End Region
Private Sub ExecuteButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ExecuteButton.Click
' Clear list view column headers and items
ResultBox.Columns.Clear()
ResultBox.Items.Clear()
' Get SQL Query from textbox
Dim sql As String = SqlStatement.Text
' Create Command object
Dim NewQuery As New SqlCommand(sql, SqlConnection1)
Try
' Open Connection
SqlConnection1.Open()
' Execute Command and Get Data
Dim NewReader As SqlDataReader = NewQuery.ExecuteReader()
' Get column names for list view from data reader
For i As Integer = 0 To NewReader.FieldCount - 1
Dim header As New ColumnHeader
header.Text = NewReader.GetName(i)
ResultBox.Columns.Add(header)
Next
' Get rows of data and show in list view
While NewReader.Read()
' Create list view item
Dim NewItem As New ListViewItem
' Specify text and subitems of list view
NewItem.Text = NewReader.GetValue(0).ToString()
For i As Integer = 1 To NewReader.FieldCount - 1
NewItem.SubItems.Add(NewReader.GetValue(i).ToString())
Next
' Add item to list view items collection
ResultBox.Items.Add(NewItem)
End While
' Close data reader
NewReader.Close()
Catch ex As SqlException
' Create and error column header
Dim ErrorHeader As New ColumnHeader
ErrorHeader.Text = "SQL Error"
ResultBox.Columns.Add(ErrorHeader)
' Add Error List Item
Dim ErrorItem As New ListViewItem(ex.Message)
ResultBox.Items.Add(ErrorItem)
Catch ex As Exception
' Create and error column header
Dim ErrorHeader As New ColumnHeader
ErrorHeader.Text = "Error"
ResultBox.Columns.Add(ErrorHeader)
' Add Error List Item
Dim ErrorItem As New ListViewItem("An error has occurred")
ResultBox.Items.Add(ErrorItem)
Finally
SqlConnection1.Close()
End Try
End Sub
End Class
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