Using C# Variable With SQL Statement

Nov 12, 2007

Greetings everyone,

I am trying to use a c# string with an SQL statement in a data adapter (.NET 03)

The code works fine and I have a variable called : string test = ..... that takes the needed values. I just need to implement this string in the sql statement. I tried adding this to my query but I only got an empty row: 

WHERE (login = '" & test &  "')

WHERE (login = '" + test +  "')

 any ideas?

PS: If I change to something like WHERE (login = 'abcdef') I get  a result meaning there's something wrong with the way I am putting the variable in the sql query.

 Again, I am not putting the string in a normal query in my .cs code. this is happening by right clicking the data adapter and configuring the sql statement in the designer window

THANKS!

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Oct 4, 2006

I am trying to set a vaiable from a select statement

DECLARE @VALUE_KEEP NVARCHAR(120),

@COLUMN_NAME NVARCHAR(120)



SET @COLUMN_NAME = (SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'CONTACTS' AND COLUMN_NAME = 'FIRSTNAME')



SET @VALUE_KEEP = (SELECT @COLUMN_NAME FROM CONTACTS WHERE CONTACT_ID = 3)



PRINT @VALUE_KEEP

PRINT @COLUMN_NAME



RESULTS

-------------------------------------------------------------------------------------------

FirstName <-----------@VALUE_KEEP

FirstName <-----------@COLUMN_NAME



SELECT @COLUMN_NAME FROM CONTACTS returns: FirstName

SELECT FirstName from Contacts returns: Brent



How do I make this select statement work using the @COLUMN_NAME variable?

Any help greatly appreciated!

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Hi,

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Code:

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Code:

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Here is the modified code:

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**
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/*
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*/
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______________________________________
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Code:


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******************

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-- Author: XXXXXXXXXXXXX
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~~~ Thanks All~~~
 

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in the query. Here's a piece of the code that is supposed to detect the current logged in user.  However, it gives the error. (some of the code may be redundant but its not causing issues that I can tell)  public void InitPage()    {            IPrincipal p = HttpContext.Current.User;            String myid = HttpContext.Current.User.ToString();            SqlServer sqlServer = new SqlServer(Util.SqlConnectionString());            DataTable dt;            SqlConnection cnn = new SqlConnection(ConfigurationManager.ConnectionStrings["myconnection"].ConnectionString);            SqlDataAdapter cmd1 = new SqlDataAdapter("select * from USER WHERE USER_NAME = "+ myid, cnn);            DataTable UIDtable = new DataTable();            cmd1.Fill(UIDtable);            User_Id.Value = UIDtable.Rows[0]["ID"].ToString();            dt = sqlServer.USER_SELECT(Util.SiteURL(Request.QueryString["Pg"].ToString()), User_Id.Value); 

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Variable Not Holding Value For Select Statement

Dec 7, 2005

this querry below works perfect when i assign the us.UserID = 29 but i need to be able to use the @UsersMaxID variable..... when i debug all of my values are right where they need to be... even this on (((   @UsersMaxID  ))) but for some reason it will not work with the next select statement...
 
can someone make the pain go away and help me here..??
 
erik..
 
GOSET ANSI_NULLS ON GO
ALTER  PROCEDURE AA
ASDECLARE @GenericColumn Varchar (200) DECLARE @GenericValue Varchar (200)
SET @GenericColumn = 'FirstName'SET @GenericValue = 'Erik'
 DECLARE @SQL NVARCHAR(4000)  DECLARE @UserID INT  DECLARE @UsersMaxID INT  DECLARE @MaxID INT
declare @tempResult varchar (1000)
-------------------------------------------Define the #Temporary Table----------------------------------------------CREATE TABLE #UsersTempTable ( ID int IDENTITY PRIMARY KEY,
UserID [int], FirstName [varchar](30), LastName [varchar](30), CompanyName [varchar](200), Address1 [varchar](75), Address2 [varchar](75), City [varchar](75),ActiveInd [int], Zip [varchar](10), WkPhone [varchar](12),HmPhone [varchar](12), Fax [varchar](12), Email [varchar](200), Website [varchar](200), UserType [varchar](20),Title [varchar](100),Note [text], StateCD [char](2), CountryCD [char](2), CompanyPhoto [varchar](50), CompanyDescr [varchar](2000)) ---------------------------------------Fill the temp table with the Customers data-----------------------------------SET @SQL = 'INSERT INTO #UsersTempTable (UserID, FirstName, LastName, CompanyName, Address1, Address2, City, ActiveInd, Zip, WkPhone, HmPhone,Fax, Email, Website, UserType, Title, Note, StateCD, CountryCD, CompanyPhoto, CompanyDescr)
Select Users.UserID, Users.FirstName,Users.LastName, Users.CompanyName, Users.Address1, Users.Address2, Users.City, Users.ActiveInd, Users.Zip, Users.WkPhone, Users.HmPhone,Users.Fax,Users.Email,Users.Website, Users.UserType,Users.Title, Users.Note,Users.StateCD, Users.CountryCD,Users.CompanyPhoto,Users.CompanyDescr
FROM USERS
 WHERE ' + @GenericColumn +' = ''' + @GenericValue  + ''''
EXEC sp_executesql @SQL
SET @MaxID = (SELECT MAX(ID) FROM #UsersTempTable)SET @UsersMaxID = (SELECT UserID From #UsersTempTable WHERE ID = @MaxID)
SELECT SpecialtyName FROM Specialty s                           INNER JOIN UserSpecialty us                           ON s.SpecialtyCD = us.SpecialtyCD                           WHERE us.UserID = 29
SELECT * FROM #UsersTempTable
 
 ==========================================================================================SET @UsersMaxID = (SELECT UserID From #UsersTempTable WHERE ID = @MaxID)
SELECT SpecialtyName FROM Specialty s                           INNER JOIN UserSpecialty us                           ON s.SpecialtyCD = us.SpecialtyCD                           WHERE us.UserID = 29 <<<<<<<<<<<<<<<<< i need @UserMaxID ........RIGHT HERE

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How Do You Place A Variable In Your Gridview Sql Statement?

Apr 12, 2006

I have the below select command in my gridview that uses a library name.table approach in the sql. I created a label on the page and want to pass the label in where i have the libarary1 text in the select statement. This will allow me to swap out the production library with my development library when im working on the site (thru the use of a site variable) 
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<selectparameters><asp:controlparameter name="company" controlid="accts" propertyname="SelectedValue"/><asp:controlparameter name="ack" controlid="podropdown" propertyname="SelectedValue"/><asp:controlparameter name="dt" controlid="htoday" propertyname="Text"/></selectparameters>
How would I insert a label.text value into the select statement replacing the library1 ? I tried to use the asp:controlparameter adding the text and placing a ? mark in place of the library1 but it failed.
Thanks for any help you can lend on this,
Todd
 
 

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