Question

VB.net with SQL SELECT command

Asked by: szadroga

I am working in Visual Studio 2005 with a web app and I am having an issue with a SQL command.  I am trying to retrieve an actual value in the CreatedByValue, but for some reason when I reference that value in the sqlEMail it is not being seen as specific value.  Instead for sqlEmail, it is just using the entire SQL command as CreatedByValue instead of a value.

In the beginning of this code, I declared CreatedByValue this way.

Dim CreatedByValue as String = ""

I am looking for CreatedByValue to be a number.

CreatedByValue = "SELECT CreatedBy FROM TblFeedback WHERE FK_User =  " + Master.SessionValue("UserID", 0).ToString
            sqlEmail = "SELECT * FROM TblUsers INNER JOIN TblFeedback ON TblUsers.PK_Users = " + CreatedByValue
            dtEmail = Master.m_db.RunSelectQuery(sqlEmail, "TblUsers")
            If Master.HasRows(dtEmail) Then
                EmailTo = dtEmail.Rows(0)("EMail")
            End If

                                  
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Asked On
2009-09-17 at 10:24:24ID24740657
Tags

VB.net

,

SQL

Topic

Microsoft Visual Basic.Net

Participating Experts
1
Points
500
Comments
11

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Answers

 

by: ChaosianPosted on 2009-09-17 at 11:35:21ID: 25359413

I think the problem is that you have to execute the query before you can use the results. What database are you on?h

 

by: szadrogaPosted on 2009-09-17 at 11:44:02ID: 25359509

I'm writing this query in Visual Studio 2005, developing a VB.NET web app.  How would i execute it first?

 

by: ChaosianPosted on 2009-09-17 at 11:45:18ID: 25359521

You need to connect to your database, then execute the command. The details of this depend on what type of database you're using.

 

by: szadrogaPosted on 2009-09-17 at 11:51:50ID: 25359586

I am connected to the database via a connection string within the web.config file.  The connection is working fine.

 

by: ChaosianPosted on 2009-09-17 at 11:55:04ID: 25359629

The fact remains that you need to execute the first query, unless you're going to build up a nested SQL query.

Something like this *might* work,

Dim createdByValueQuery As String = "SELECT CreatedBy FROM TblFeedback WHERE FK_User =  " & Master.SessionValue("UserID", 0).ToString
Dim createdByValue As Integer = Master.m_db.RunSelectQuery(createdByQueryValue, "TblFeedback")
sqlEmail = "SELECT * FROM TblUsers INNER JOIN TblFeedback ON TblUsers.PK_Users = " & CreatedByValue.ToString
dtEmail = Master.m_db.RunSelectQuery(sqlEmail, "TblUsers")
                                              
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by: ChaosianPosted on 2009-09-17 at 12:09:22ID: 25359759

Alternately, you could try this:

            sqlEmail = "SELECT * FROM TblUsers INNER JOIN TblFeedback ON TblUsers.PK_Users = TblFeedback.FK_User WHERE TblFeedback.FK_USER = " & Master.SessionValue("UserID", 0).ToString
            dtEmail = Master.m_db.RunSelectQuery(sqlEmail, "TblUsers")
            If Master.HasRows(dtEmail) Then
                EmailTo = dtEmail.Rows(0)("EMail")
            End If
                                              
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by: szadrogaPosted on 2009-09-17 at 12:09:56ID: 25359768

I tried inserting this code but got the following arguement.  Was this supposed to be a different variable?

++see image++

 

by: ChaosianPosted on 2009-09-17 at 12:11:04ID: 25359780

Should be createdByValueQuery

 

by: szadrogaPosted on 2009-09-17 at 12:16:54ID: 25359848

I figured that so i gave it a try...now i get the following arguement

 

by: ChaosianPosted on 2009-09-17 at 12:22:48ID: 25359909

Here's a tweak to that code that should work. However... I'd use the other one I posted so that you only make one database call.

Dim createdByValueQuery As String = "SELECT CreatedBy FROM TblFeedback WHERE FK_User =  " & Master.SessionValue("UserID", 0).ToString
Dim dt As DataTable = Master.m_db.RunSelectQuery(createdByQueryValue, "TblFeedback")
If dt.Rows.Count > 0 Then
    sqlEmail = "SELECT * FROM TblUsers WHERE TblUsers.PK_Users = " & dt.Rows(0)("FK_User")
    dtEmail = Master.m_db.RunSelectQuery(sqlEmail, "TblUsers")
End If

                                              
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