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Help on using a multiselect list to filter a MySQL query in xbasic

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  • Help on using a multiselect list to filter a MySQL query in xbasic

    I am trying to use a multi-select list to gather records that will be utilized in an ajax callback to the server and passed in via the e. argument and then be incorporated into a MySQL query filter. I have everything working except for the last part. I'm not sure how to format the lists data and incorporate it into the query. I have included some of the code below for reference.

    filter1 collects the 'SYSTEMS' list values from the user making their selections. An example of what is passed in the ajax callback for e.dataSubmitted.SYSTEMS is this:
    [3] : { {101-PTA} , {1201-PET} , {1508-PTA} }
    The info above is only showing 3 records but it could be 1 or hundreds. The results are processed as JSON and utilized in a FusionChart. That part works as well.

    I realize that I can't just plug 'filt1' in the query like that. I was just using that as a placeholder until I figured out what should really go there.

    Any direction would be greatly appreciated.

    Code:
    flag=cn.open("::Name::trackerdb")
    
    filter1 = e.dataSubmitted.SYSTEMS
    
    sql="SELECT PendingTotal AS value FROM view_dashboard_punch_MG_construction WHERE System=:filt1"
    args.add("filt1",filter1)
    flag=cn.execute(sql,args)
    rs=cn.ResultSet
    pp=rs.ToJSONObjectSyntax()
    pp=stritran(pp,crlf(),",")
    session.a_PendingData = pp

  • #2
    Re: Help on using a multiselect list to filter a MySQL query in xbasic

    There are a few ways to do this; here's one. Dump the array to a string with the values quoted, separated by commas, and use that in the query:

    Code:
    result = e.dataSubmitted.SYSTEMS.dump()
    resultstring = ""
    for each row in result
    	*concat(resultstring, "'" + row.value + "',")
    next
    resultstring = strip_trailing_char(resultstring, ",")
    
    sql="SELECT PendingTotal AS value FROM view_dashboard_punch_MG_construction WHERE System IN(" + resultstring + ")"
    This doesn't use an argument, and that's OK, though you can also arrange it so.
    This also assumes the return values do not have a single-quote mark in them -- that would need to be handled.

    I've found that the IN() clause can handle a fairly large number of choices, so this should work.

    If it doesn't and the number of values in the IN() clause are too large, then you might consider dumping the values into a table (temp tables are great!) and creating a join.
    -Steve
    sigpic

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    • #3
      Re: Help on using a multiselect list to filter a MySQL query in xbasic

      You can process the selected List values with a few statements and then use the SQL IN clause to pull all the rows...

      Code:
      dim listCSV as c
      listCSV =  e.dataSubmitted.List1.dump()
      listCSV = crlf_to_comma(listCSV)
      
      args.set("listIds",listCSV)
      
      sql = "SELECT Customer_ID FROM tblCustomers WHERE Customer_ID IN (:listIds)"
      This dumps the array of selected List Ids into a CRLF delimited string.
      Then change the CRLF to Commas... as you'll all set for the IN clause.

      Use args.sets instead of args.add... it's a bit better.
      Edit: Cleaned up a bit... didn't need all that code.
      Last edited by Davidk; 04-06-2017, 11:20 PM.

      Comment


      • #4
        Re: Help on using a multiselect list to filter a MySQL query in xbasic

        Thank you very much Steve! I'll drop that into the xbasic in the morning and see how it goes. The SYSTEM list will never have a single quote so that won't be an issue and the total number of records should never exceed about 750 so that shouldn't be an issue either. Thanks again for the quick response!

        Drew

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