Is it possible to return the column names from the database using a SQL query,
what i need to do is
SELECT * FROM FEATURES WHERE 'VALUE' = 'YES'
i have a table which has a list of features and if they are selected i store the value yes, otherwise no . i want to be able to display a list of the features from the tables which have the value yes ! is this possible?
Hi all,
In the Programmability/Stored Procedure of Northwind Database in my SQL Server Management Studio Express (SSMSE), I have the following sql:
USE [Northwind]
GO
/****** Object: StoredProcedure [dbo].[SalesByCategory] Script Date: 03/25/2008 08:31:09 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [dbo].[SalesByCategory]
@CategoryName nvarchar(15), @OrdYear nvarchar(4) = '1998'
AS
IF @OrdYear != '1996' AND @OrdYear != '1997' AND @OrdYear != '1998'
BEGIN
SELECT @OrdYear = '1998'
END
SELECT ProductName,
TotalPurchase=ROUND(SUM(CONVERT(decimal(14,2), OD.Quantity * (1-OD.Discount) * OD.UnitPrice)), 0)
FROM [Order Details] OD, Orders O, Products P, Categories C
WHERE OD.OrderID = O.OrderID
AND OD.ProductID = P.ProductID
AND P.CategoryID = C.CategoryID
AND C.CategoryName = @CategoryName
AND SUBSTRING(CONVERT(nvarchar(22), O.OrderDate, 111), 1, 4) = @OrdYear
GROUP BY ProductName
ORDER BY ProductName
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
From an ADO.NET 2.0 book, I copied the code of ConnectionPoolingForm to my VB 2005 Express. The following is part of the code:
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Drawing
Imports System.Text
Imports System.Windows.Forms
Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.Common
Imports System.Diagnostics
Public Class ConnectionPoolingForm
Dim _ProviderFactory As DbProviderFactory = SqlClientFactory.Instance
Public Sub New()
' This call is required by the Windows Form Designer.
InitializeComponent()
' Add any initialization after the InitializeComponent() call.
'Force app to be available for SqlClient perf counting
Using cn As New SqlConnection()
End Using
InitializeMinSize()
InitializePerfCounters()
End Sub
Sub InitializeMinSize()
Me.MinimumSize = Me.Size
End Sub
Dim _SelectedConnection As DbConnection = Nothing
Sub lstConnections_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles lstConnections.SelectedIndexChanged
_SelectedConnection = DirectCast(lstConnections.SelectedItem, DbConnection)
EnableOrDisableButtons(_SelectedConnection)
End Sub
Sub DisableAllButtons()
btnAdd.Enabled = False
btnOpen.Enabled = False
btnQuery.Enabled = False
btnClose.Enabled = False
btnRemove.Enabled = False
btnClearPool.Enabled = False
btnClearAllPools.Enabled = False
End Sub
Sub EnableOrDisableButtons(ByVal cn As DbConnection)
btnAdd.Enabled = True
If cn Is Nothing Then
btnOpen.Enabled = False
btnQuery.Enabled = False
btnClose.Enabled = False
btnRemove.Enabled = False
btnClearPool.Enabled = False
Else
Dim connectionState As ConnectionState = cn.State
btnOpen.Enabled = (connectionState = connectionState.Closed)
btnQuery.Enabled = (connectionState = connectionState.Open)
btnClose.Enabled = btnQuery.Enabled
btnRemove.Enabled = True
If Not (TryCast(cn, SqlConnection) Is Nothing) Then
btnClearPool.Enabled = True
End If
End If
btnClearAllPools.Enabled = True
End Sub
Sub StartWaitUI()
Me.Cursor = Cursors.WaitCursor
DisableAllButtons()
End Sub
Sub EndWaitUI()
Me.Cursor = Cursors.Default
EnableOrDisableButtons(_SelectedConnection)
End Sub
Sub SetStatus(ByVal NewStatus As String)
RefreshPerfCounters()
Me.statusStrip.Items(0).Text = NewStatus
End Sub
Sub btnConnectionString_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnConnectionString.Click
Dim strConn As String = txtConnectionString.Text
Dim bldr As DbConnectionStringBuilder = _ProviderFactory.CreateConnectionStringBuilder()
Try
bldr.ConnectionString = strConn
Catch ex As Exception
MessageBox.Show(ex.Message, "Invalid connection string for " + bldr.GetType().Name, MessageBoxButtons.OK, MessageBoxIcon.Error)
Return
End Try
Dim dlg As New ConnectionStringBuilderDialog()
If dlg.EditConnectionString(_ProviderFactory, bldr) = System.Windows.Forms.DialogResult.OK Then
txtConnectionString.Text = dlg.ConnectionString
SetStatus("Ready")
Else
SetStatus("Operation cancelled")
End If
End Sub
Sub btnAdd_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnAdd.Click
Dim blnError As Boolean = False
Dim strErrorMessage As String = ""
Dim strErrorCaption As String = "Connection attempt failed"
StartWaitUI()
Try
Dim cn As DbConnection = _ProviderFactory.CreateConnection()
cn.ConnectionString = txtConnectionString.Text
cn.Open()
lstConnections.SelectedIndex = lstConnections.Items.Add(cn)
Catch ex As Exception
blnError = True
strErrorMessage = ex.Message
End Try
EndWaitUI()
If blnError Then
SetStatus(strErrorCaption)
MessageBox.Show(strErrorMessage, strErrorCaption, MessageBoxButtons.OK, MessageBoxIcon.Error)
Else
SetStatus("Connection opened succesfully")
End If
End Sub
Sub btnOpen_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnOpen.Click
StartWaitUI()
Try
_SelectedConnection.Open()
EnableOrDisableButtons(_SelectedConnection)
SetStatus("Connection opened succesfully")
EndWaitUI()
Catch ex As Exception
EndWaitUI()
Dim strErrorCaption As String = "Connection attempt failed"
SetStatus(strErrorCaption)
MessageBox.Show(ex.Message, strErrorCaption, MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try
End Sub
Sub btnQuery_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnQuery.Click
Dim queryDialog As New QueryDialog()
If queryDialog.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
Me.Cursor = Cursors.WaitCursor
DisableAllButtons()
Try
Dim cmd As DbCommand = _SelectedConnection.CreateCommand()
cmd.CommandText = queryDialog.txtQuery.Text
Using rdr As DbDataReader = cmd.ExecuteReader()
If rdr.HasRows Then
Dim resultsForm As New QueryResultsForm()
resultsForm.ShowResults(cmd.CommandText, rdr)
SetStatus(String.Format("Query returned {0} row(s)", resultsForm.RowsReturned))
Else
SetStatus(String.Format("Query affected {0} row(s)", rdr.RecordsAffected))
End If
Me.Cursor = Cursors.Default
EnableOrDisableButtons(_SelectedConnection)
End Using
Catch ex As Exception
Me.Cursor = Cursors.Default
EnableOrDisableButtons(_SelectedConnection)
Dim strErrorCaption As String = "Query attempt failed"
SetStatus(strErrorCaption)
MessageBox.Show(ex.Message, strErrorCaption, MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try
Else
SetStatus("Operation cancelled")
End If
End Sub
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
I executed the code successfully and I got a box which asked for "Enter the query string".
I typed in the following: EXEC dbo.SalesByCategory @Seafood. I got the following box: Query attempt failed. Must declare the scalar variable "@Seafood". I am learning how to enter the string for the "SQL query programed in the subQuery_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnQuery.Click" (see the code statements listed above). Please help and tell me what I missed and what I should put into the query string to get the information of the "Seafood" category out.
Thanks in advance,
Scott Chang
Hi,
Does anyone has query to give all table sizes on a database?
Appreciate your help.
Thanks
I am trying to use the Import Wizard to setup a daily job to import new records based on an ID field (PK). The source database is remote and a replica. I am inserting new records to update my table called the same thing. Both are SQL Native Client
Code Snippet
select *
from [CommWireless].[dbo].[iQclerk_SaleInvoicesAndProducts] as S1
join [IQ_REPLICA].[dbo].[iQclerk_SaleInvoicesAndProducts] as S2
on S1.SaleInvoiceID = S2.SaleInvoiceID
where S1.SaleInvoiceID > S2.SaleInvoiceID
When I parse the query, I keep getting an error message.
Deferred prepare could not be completed.
Statement(s) could not be prepared.
Invalid object name 'IQ_REPLICA.dbo.iQ_SaleInvoicesAndProducts'. (Microsoft SQL Native Client)
Anyone know an easy why to get this to work? Or should I add a create table to verify new records?
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go
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go
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Hello,
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NW Natural
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Good Morning
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Hi,
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-- Regards
Prashant
Dear Sir,
I am building a website some what like B2B portal using asp.net and access database. I want to provide a search facility to the user through which they can search products in our database.
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Thanking You
Suraj
Hi,
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