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List Manipulation Design

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    List Manipulation Design

    We have several identical MSSQL databases, and there is a particular field in a particular table is updated for each database at the end of each day- it's a tinyint that changes from 0 to 1. We need a simple dashboard to show when each database field has switched for the day. I'd prefer not to create a table or save any data for this dashboard, and instead just grab the data from elsewhere as needed.

    I've created a list control based on a custom xbasic function: the function queries each server, gets the field and populates to an array, and finally the array is converted to json and sent to the list control.

    This works great so far. The issue is that it takes some time to query each server, so it is inefficient to update the entire list once we know a particular database has switched over. The list's custom xbasic template has notes on how to run a filter, but it's not really a filter on a query, it's eliminating a query for a server.

    So I guess, the question is: any general design pointers on how to pass the data from the populated list back to the xbasic function, parse it out to just find the databases still needing updated, perform the update on just those servers, and then pass everything back to the list again.

    Here's pseudocode for the full query as it stands now:

    Code:
    dim dToday as d = today()
    
    'array of each of the branch location databases
    dim arrBranch[0] as p
    
    '.. fill the array from another table, array structure like below ..
    arrBranch[].Branch_Num = 1
    arrBranch[..].Branch_Name = "Branch One"
    arrBranch[..].server_name = "Br1_Name"
    arrBranch[..].server_Pass = "Encrypted_Password"
    arrBranch[..].Forwarded = 0
    '.. and so on ..
    
    
    for i = 1 to ArrBranch.size()
    	delete sql
    	dim sql as c = "Select BranchID, Forwarded from [Database].[dbo].[Table] where CAST([BusinessDate] as DATE) = '" + dtoc(dToday) + "';"
    	
    	delete cn
    	dim cn as sql::Connection
    	delete cConnStr 
    	dim cConnStr as c = "{A5API='SQLServer',Server='"+arrBranch[i].Branch_server+"'}"
    	
    	delete rs
    	dim rs as sql::ResultSet
    	
    	if .not. cn.open(cConnStr,"UserName",a5_decrypt_string(ArrBranch[i].server_pass,"decrypt_key")) then
                                'error handling
    		goto SkipBranchServer
    	end if
    	if .not. cn.Execute(sql) then
                                'error handling
    		cn.close()
    		goto SkipBranchServer
    	end if
    	
    	rs = cn.ResultSet
    	cn.close()
    	
    	if rs.RowCount > 0 then
    		arrBranch[i].Forwarded = rs.data("Forwarded")	
    	end if
    	
    	SkipBranchServer:	
    	
    next i
    
    dim ReturnText
    ReturnText = vartojson(ArrBranch)

    #2
    Re: List Manipulation Design

    Jeff,

    It sounds like you just need the part to get all data from the List control and process it in XBasic. From whatever event you're calling you Ajax Callback...

    Code:
    var lObj = {dialog.Object}.getControl('list');
    var listData = JSON.stringify(lObj._rData);
    {dialog.Object}.ajaxCallback('','','passListData','','__listData='+listData);
    Here, you're getting a pointer to the list object. Then, you're grabbing all the list data... which is found in _rData.
    Then, you're passing that data into the callback... in my case named "passListData"... as additional data in the form of a URL parameter string... name/value pairs.
    So... __listData is the parameter you're passing into the callback. This parameter gets attached to the "e" object which is available in the callback.

    In the callback...

    Code:
    function passListData as c (e as p)
    	
    dim listData as p
    listData = JSON_parse(e.__listData)
    
    for i = 1 to listData.size()
    	currId = listData[i].Id
    next i
    	
    	
    end function
    Dim a pointer variable to hold the list data... and then parse the incoming data in e.__listData into that pointer var.

    You can then easily loop through the list data grabbing what you need for testing.

    Comment


      #3
      Re: List Manipulation Design

      Thanks, David! The process to JSON.stringify the entire list object was the concept I was missing- this should work perfectly.

      Comment

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