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Using session var 'userID' to read another value on the DB

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    Using session var 'userID' to read another value on the DB

    I've got a project where the data flow is quite standard:
    1. A user logs using a login screen (we get his session var userID there)
    2. He browses some info
    3. Then he enters some data from a dialog-grid, etc

    My problem is the following: on step 3, when he enters the info, I want one field that uses the identity of the user, say a student ID, and not his userID (available from the session var). I've got in the DB a table that matches every userID to his real ID, kind of:

    userID | RealID
    john123 GATX123

    So how could I read/obtain the realID?

    PS: I've just realised this should go on the Web forum. Copied there!

    Is this done in the login screen, adding another line after

    session.userid=lookup("C:\A5Webroot\<projectName>\websecurity_users.dbf","userid="+quote(userID),"userid") ?

    Or is there any other method that gives you the realID on the component of interest, like a dialog?

    Thanks in advance, p.
    Last edited by au232; 10-04-2013, 08:32 AM.

    Re: Using session var 'userID' to read another value on the DB

    The lookup you propose is likely the best way to do it. Though I think you want



      Re: Using session var 'userID' to read another value on the DB

      The "realid" will not be present in the websecurity_users table as those security tables should not be altered. Typically you have a "local" web_users table that is linked to the websecurity_users table either on GUID or USERID. That table would have your realid for each user. Then you would perform a lookup similar to this:

      dim pUser as p
      dim pUser.userid as c

      or preferably using an index named "userid"

      Steve Wood
      See my profile on IADN


        Re: Using session var 'userID' to read another value on the DB

        Thanks Larry and Steve, but I'm a bit lost now!

        As said, my post should have been on the web forum (it's copied there too). My users 'realid'-'userid' match table is in an .MDB Access database, that has an alphaDAO connection. So are the tables in your replies in a database, or in a PC folder? I don't ge that.

        I guess session.readid 'reads' the realid in a table using 'userid' to filter and find the right one, but not sure what PathAlias means there, or about what the different parts in the lookup instruction are.


          Re: Using session var 'userID' to read another value on the DB

          If your data is in an Access table, ignore the mentioned "PathAlias.ADB_Path". My fault for introducing that without qualification. For Access, you would use standard SQL or Alpha's sql_lookup() function:


          session.readid = sql_lookup(cn,"myusers","userid='"+pUser.userid+"'","realid")
          Steve Wood
          See my profile on IADN


            Re: Using session var 'userID' to read another value on the DB

            Thanks Steve, that helps very much. So let's say I have a project with 2 pages:

            login.a5w: A login page, where a session var USERID is captured. The code on this page is:

            results.a5w: A results page, where I display some user info based on the REALID info.

            Following your suggestion, could I calculate on this page the REALID with JUST this single line (and then use it in subsequent pages):

            session.realID = sql_lookup("::name::GA3","customers","userid='" + session.userid+"'  ", "realID")


            -Do I need to declare anything else before that line (for example, the var, or the connection)?
            -Can the sql_lookup be declared in PAGE 2 and used in PAGE 2 (in a component declared below), or you must declare it in PAGE 2 and then use in PAGES 3-4 .......?

            Thanks, p

            PS: I've tested the previous structure on PAGE 3 and it works. Still unsure about running the sql_lookup and using it on the same page.
            Last edited by au232; 10-07-2013, 10:43 AM.