1. – the JukeBox toolkit – transparency, flexibility, speed and comfort!
Brynjar Hasle, Chemistry as

2. Operational requirements:
Slick and consistent User Interface
Exceptional development speed (low, that is)
Automation of trivial tasks
Transparency client-server / appserver
Minimal setup
Very small client footprint

3. ResizeLib.p (free download from www.chemistry.no) AbHack! (PSDN)
Tools:
ABL (9.1d+)
MS tabstrip and dynTreeView.w (alt. pure4GLtv on PSDN) or better: Controls.dll from
ResizeLib.p (free download from
AbHack! (PSDN)
+ A couple of nice AppBuilder extensions.

4. Basic Elements ObjLib.p User...w JBox...w UiLib.p AsLib.p
Client:
User...w
JBox...w
UiLib.p
AsLib.p
Server:
Retrieve data: -getTempTableJoin.p
-getFieldList.p
getFieldValues.p (FIND)
-getTempTable (input <fill>.p) -checkCurrentChanged.p ..
+ custom query procs
Store data: -serverTrans.p -runProc.p -processQuery.p ..
+ custom BL procs

5. Client in OERA perspective
ObjLib.p ”Component Model”
User...w
”View”
ttObject
JBox...w
”View”
UiLib.p ”Presenter”
ttEvent
ttObjectLink
ttAttribute
AsLib.p ”Service Adapter”
”Common infrastructure”

6. Server, get data (getTempTableJoin.p)
Calculated fields - with runtime parameters and filter option Support for persistent procedures for calc.fields
Filter on calculated fields
Filter on joined buffers (subselect and not exists)
Filter on values that are not even in query buffers..
Multiple joins to same table
Sorting on calculated fields
Query count, count distinct
Accumulation of totals and subtotals
Support for duplicate field names
Support for extent-fields
Validation of query against schema security
Returns temp-table handle (and hence the data) pluss additional context info (read/write restrictions)

7. More on query service.. Paging implemented by keeping transfer count
Server query always starts from FIRST/LAST
Client rejects duplicates
Sub-selects (pre-scan)
Done by dynamically adding TT to query:
Sub-select processes query “backwards”
Index (EACH), timeout and record count check!
All records (in query) are processed when
Sorting on calculated values
Querying distinct values
Grand totals involve calculated fields
All records are traversed when
Doing record count or grand totals
Ability to automatically change buffer sequence (!)
Client feature
Logging default enabled in development

8. Demo: Query features

9. Demo: Sport2000 order query with drill-down capability
SalesRep
Customer
Order
OrderLine
Item
FOR EACH Order NO-LOCK
,FIRST Customer OF Order NO-LOCK
,FIRST SalesRep OF Order NO-LOCK
,EACH OrderLine OF Order NO-LOCK
,FIRST Item OF OrderLine NO-LOCK