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Set connection string from argument

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  • Set connection string from argument

    I don't think I can use the multi-tenant dynamic connection string since it uses a session variable. Can a connection string in a list control be set to the value of an argument?

    I will have both multiple databases for tenant type and multiple tenants per database. A user may be in multiple databases. At login they will pick which database to view from their available options and go directly to a master UX. I plan to set a session variable just long enough to launch the master UX and set an argument. This is because it is possible they might launch another browser tab and login to a second database.


  • #2
    Re: Set connection string from argument

    Bill - a session variable is tied to the browser instance. A browser - whether you have one or two tabs, uses the same session on the server. Are you suggesting a user can have two different logins to two different databases/applications in one browser?


    • #3
      Re: Set connection string from argument

      Yes, only one session per browser is the problem. I don't mind using session variable for quick temporary use in order to set argument, which will then stay "stuck" to that UX while it exists.

      Then if a user happens to login again and open a second database, the session var will be reset, and argument created for the master UX on the additional browser tab. The two arguments should be independent.



      • #4
        Re: Set connection string from argument

        Bill... you'd have to test this, but you could use an Argument in the myConnection.MultiTenant XBasic Class.

        In the function named "query"... args are passed in. One of those arguments could be your Argument. You'd need to extract your argument from args and then modify the class a bit.

        In the class... _tenantId is set to the session variable. Instead, set it to your argument.

        You must be careful about the XBasic code in this created class. There are 2 options for Tenant ID field type... Numeric and Character. If Alpha tested Character, they never tested is fully. If your List SQL statement includes a WHERE clause... and your Tenant ID field type is Character, your SQL Statement will blow up. This is because Alpha is not taking care of _tenantdId in this scenario.


        • #5
          Re: Set connection string from argument

          That gives me something to start looking at. However, my tenant id is a guid, which in sql server is binary? The lists setup will probably not have additional Where, but the user will certainly add runtime filters. Could I override the filtering at runtime and not use the built in tenant id? This would also let me have a "super user" that can see all records.



          • #6
            Re: Set connection string from argument

            I guess it depends where you get your guid from. Some are strings. If you're using the AlphaDAO Connection String Multi-Tenant setup then, by default, the tenantid is added to the SQL Select within the class xbasic.

            No reason why you can't client-side filter at runtime.


            • #7
              Re: Set connection string from argument

              Bill, here's one way you can do it, but it is limited. If you have multiple instances of the WAS, then in the configuration you can set separate sessions, and the session variables in one will not conflict with the session variables in the others. The limit, of course, is if you have enough instances for one per database. In this case, the user logs in to separate instances.
              Pat Bremkamp
              MindKicks Consulting


              • #8
                Re: Set connection string from argument

                You could build the values (JSON or CRLF) for your List component in the server-side OnDialogInit event (or maybe OnExecute) or an xbasic callback, and then push those to the List, which would be set to Custom rather than SQL.​
                Steve Wood
                Join the ALPHA DEVELOPERS NETWORK
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                • #9
                  Re: Set connection string from argument

                  Here is some pseudocode xbasic that would 1) select the correct connection string, 2) populate the list

                  function getListnames as c (e as p)

                  dim db as c

                  ' set db to the correct database based on login or other settings

                  something = 1 'debug value

                  case something = 1
                  db = "mydatabase_1" ' test example
                  case something = 2
                  db = "mydatabase_2" ' test example

                  'etc, including error trapping

                  end select

                  dim lst as c

                  dim cn as sql::Connection
                  dim args as sql::Arguments
                  dim rs as sql::ResultSet

                  conn = "::name::" + db ' e.g., "::name::db1"

         ' opens the correct database

                  vsql = <<%txt%
                  SELECT top 100

                  rs = cn.ResultSet
                  lst = rs.tostring(-1,-1,.t.,"|")

                  'lst will contain crlf delimited list of values from database

                  lst = "field1|field2|field3" + crlf() + lst

                  getListnames = lst

                  end function
                  Steve Wood
                  Join the ALPHA DEVELOPERS NETWORK
                  There is no Cloud. It's just someone else's computer.
                  Web - Mobile - Hosting - Products - Frameworks - Developer Resources
                  AlphaToGo | IADN (100% Alpha Anywhere Websites)