Difference between revisions of "VbzCart/pieces/catalog/building"

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(removed src_* table defs; forgot that I had done them here, and went and created the ctg_* bunch instead -- the cost of frequent interruption)
m (updated template name)
 
(42 intermediate revisions by the same user not shown)
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==Navigation==
 
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[[VbzCart]]: [[VbzCart catalog building|catalog building]]
 
 
==Version==
 
==Version==
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This is being revised yet again for the 2007 VbzCart-MySQL migration project; the previous version is here: [[vbzwiki:VbzCart catalog building 2006|VbzCart catalog building 2006]].
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This is a tricky process which has been revised multiple times.
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==Process==
 
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This is only a draft, as the process is still being worked out. Right now this process does not "recycle" junked records in cat_items; perhaps that was a bad idea to begin with, or perhaps some other use can be found for junked records that isn't part of catalog-building. There probably should be some process which removes junked records from use so they aren't taking up space and CPU cycles.
 
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# Update the list of all catalog-based items ([calc Items Updates saved])
 
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#* [[#(Step 1) qryVb_Items_updates_append]] -- Add any new items to [calc Items Updates saved]
 
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#** [[#(Step 1a) qryVb_Items_updates_new]] -- in-print items that are new
 
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#*** [[#(Step 1aa) qryVb_Items_updates]] -- all the items currently available from suppliers (in print)
 
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#** [[#(Step 1b) qryVb_Items_updates_copy_fields]]
 
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# For all items in [calc Items Updates saved] where ID_Item IS NULL, create new records in cat_items and update the corresponding records in [calc Items Updates saved]
 
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#* [[#(Step 2) qryVb_Items_results_append]] -- adds new cat_items rows for any calculated items not already cross-referenced. It doesn't cross-reference them, however. That is done by the next query.
 
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#** [[#(Step 2a) qryVb_Items_results]]
 
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# Fill in any blank ID_Item fields in [calc Items Updates saved] records:
 
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#* [[#(Step 3) qryVb_Items_updates_index_new]] -- plugs the Item ID back into the calculated temp table. It assumes (1) 1:1 correspondence between Item IDs and catalog numbers, and (2) catalog numbers won't be changed during the course of a build (though they can change in general).
 
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# Copy calculated item data over to [cat_items]:
 
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#* [[#(Step 4) qryVb_Items_results_update]]
 
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# Final flag updates:
 
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#* [[#(Step 5) qryVb_Items_update_final]]
 
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#** Clear isInPrint flag for cat_items not found in calculated in-print listing
 
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#** Set isForSale for cat_items with stock for sale
 
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#** Update stock quantities for all cat_items
 
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# Housekeeping: mark table as updated so cached tables get recalculated
 
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#* [[#(Step 6) qryVb_Items_mark_updated]]
 
  
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==SQL - queries==
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* {{l/sub|2017}} version - 2016 code apparently never really got finished, and the Items table needs some flag changes
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These are from the MS Access 97 version, gradually being honed down for migration to MySQL
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* {{l/sub|2016}} version - webified version of 2010, with rules finally documented
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===(Step 1a) qryVb_Items_updates_new===
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* '''2010''' version: see {{l/vbzcart/code|maint/build-cat.php}}
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<sql>SELECT c.*
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* {{l/sub|2009}} version - SQL statements executed directly from PHP code
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FROM qryCtg_Items_updates_joinable AS c LEFT JOIN ctg_updates AS s
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* {{l/sub|2008}} version - started in 2007 - a set of stored queries called from a stored procedure
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ON c.IDS_Item=s.IDS_Item
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* {{l/sub|2006}} version
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WHERE s.IDS_Item IS NULL;</sql>
 
  
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===(Step 1) qryVb_Items_updates_append===
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It's interesting to note that I originally thought of SCM Groups as groups ''of Titles'' -- an explanation from the [[VbzCart/tables]] page on 2008-02-17 (and only removed on 2016-02-01) says:
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<sql>INSERT INTO ctg_updates (
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<blockquote>The key concept here is "catalog title groups" (CTGs). A CTG is a set of titles which are all available with the same set of options (e.g. sizes) at the same prices (e.g. $10 S, $11 M-XL, $12 2XL). The final vbz catalog (cat_items) is the result of a sort of vector multiplication of Titles (cat_titles) and CTGs plus any items in stock.
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  ID_Item,
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</blockquote>
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  IDS_Item,
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This conceptualization no longer works, as a SCM Title may have one or more SCM Groups -- e.g. if it has a set of standard sizes (like S-3X) but is also available in super-large sizes (4X+).
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  CatNum,
 
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  CatSfx,
 
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  ID_Title,
 
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  ID_CTG_Group,
 
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  ID_CTG_Title,
 
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  ID_CTG_Item,
 
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  ID_ItTyp,
 
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  ID_ItOpt )
 
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SELECT
 
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  0 AS ID_Item,
 
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  IDS_Item,
 
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  CatNum,
 
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  CatSfx,
 
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  ID_Title,
 
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  ID_TGroup,
 
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  ID_TGTitle,
 
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  ID_TGItem,
 
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  ID_ItTyp,
 
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  ID_ItOpt
 
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FROM qryVb_Items_Updates_new;
 
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</sql>
 
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===(Step 2) qryVb_Items_results_append===
 
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This adds new cat_items rows for any calculated items not already cross-referenced. It doesn't cross-reference them, however. That is done by the next query.
 
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<sql>INSERT INTO cat_items (
 
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  CatNum,
 
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  isForSale,
 
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  isMaster,
 
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  isInPrint,
 
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  isCloseOut,
 
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  ID_ItTyp,
 
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  ID_ItOpt,
 
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  ItOpt_Descr,
 
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  ItOpt_Sort,
 
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  ID_ShipCost,
 
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  PriceBuy,
 
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  PriceSell,
 
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  PriceList )
 
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SELECT
 
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  r.CatNum,
 
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  r.isForSale,
 
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  FALSE AS isMaster,
 
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  r.isInPrint,
 
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  r.isCloseOut,
 
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  r.ID_ItTyp,
 
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  r.ID_ItOpt,
 
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  r.ItOpt_Descr,
 
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  r.ItOpt_Sort,
 
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  r.ID_ShipCost,
 
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  r.PriceBuy,
 
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  r.PriceSell,
 
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  r.PriceList
 
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FROM qryCtg_Items_updates AS r LEFT JOIN cat_items AS i ON r.ID_Item=i.ID
 
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WHERE i.ID IS NULL;
 
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</sql>
 
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===(Step 3) qryVb_Items_updates_index_new===
 
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This plugs the Item ID back into the calculated temp table. It assumes (1) 1:1 correspondence between Item IDs and catalog numbers, and (2) catalog numbers won't be changed during the course of a build (though they can change in general).
 
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<sql>UPDATE
 
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  ctg_updates AS s LEFT JOIN
 
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  cat_items AS i
 
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ON i.CatNum=s.CatNum
 
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SET
 
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  s.ID_Item = i.ID,
 
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  isForSale = FALSE,
 
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  isInPrint = FALSE
 
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WHERE
 
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  s.ID_Item IS NULL;
 
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</sql>
 
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===(Step 4) qryVb_Items_results_update===
 
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<sql>UPDATE
 
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  qryCtg_build AS r LEFT JOIN
 
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  cat_items AS i
 
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ON
 
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  r.ID_Item=i.ID
 
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SET
 
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  i.CatNum = r.CatNum,
 
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  i.isForSale = r.isForSale,
 
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  i.isInPrint = r.isInPrint,
 
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  i.isCloseOut = r.isCloseOut,
 
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  i.isPulled = FALSE,
 
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  i.isDumped = FALSE,
 
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  i.ID_ItTyp = r.ID_ItTyp,
 
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  i.ID_ItOpt = r.ID_ItOpt,
 
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  i.ItOpt_Descr = iif(r.ItOpt_Descr IS NULL,i.ItOpt_Descr,r.ItOpt_Descr),
 
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  i.ItOpt_Sort = r.ItOpt_Sort,
 
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  i.ID_ShipCost = r.ID_ShipCost,
 
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  i.PriceBuy = r.PriceBuy,
 
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  i.PriceSell = r.PriceSell,
 
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  i.PriceList = r.PriceList,
 
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  i.GrpCode = r.GrpCode,
 
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  i.GrpDescr = r.GrpDescr,
 
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  i.GrpSort = r.GrpSort,
 
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  i.CatSfx = r.CatSfx
 
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WHERE r.ID_Item IS NOT NULL;
 
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</sql>
 
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Changes:
 
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* Must clear isPulled and isDumped, in case pulled items are returned to service
 
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===(Step 5) qryVb_Items_update_final===
 
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* Clear isInPrint flag for cat_items not found in calculated in-print listing
 
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* Set isForSale for cat_items with stock for sale
 
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* Update stock quantities for all cat_items
 
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<sql>UPDATE
 
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  (cat_items AS i LEFT JOIN qryCtg_build AS r ON r.ID_Item=i.ID)
 
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  LEFT JOIN v_stk_items_remaining AS s ON s.ID_Item=i.ID
 
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SET
 
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  i.isInPrint = nz(r.isInPrint),
 
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  i.isCloseOut = nz(r.isCloseOut),
 
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  i.isForSale = nz(r.isInPrint)
 
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      OR nz(r.isCloseOut)
 
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      OR (nz(s.QtyForSale) > 0),
 
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  i.qtyInStock = nz(s.QtyForSale);
 
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</sql>
 
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===(Step 6) qryVb_Items_mark_updated===
 
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<sql>UPDATE
 
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  data_tables
 
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SET WhenUpdated=Now()
 
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WHERE Name="cat_items"</sql>
 

Latest revision as of 11:07, 12 June 2017

Version

This is a tricky process which has been revised multiple times.

  • 2017 version - 2016 code apparently never really got finished, and the Items table needs some flag changes
  • 2016 version - webified version of 2010, with rules finally documented
  • 2010 version: see maint/build-cat.php
  • 2009 version - SQL statements executed directly from PHP code
  • 2008 version - started in 2007 - a set of stored queries called from a stored procedure
  • 2006 version

It's interesting to note that I originally thought of SCM Groups as groups of Titles -- an explanation from the VbzCart/tables page on 2008-02-17 (and only removed on 2016-02-01) says:

The key concept here is "catalog title groups" (CTGs). A CTG is a set of titles which are all available with the same set of options (e.g. sizes) at the same prices (e.g. $10 S, $11 M-XL, $12 2XL). The final vbz catalog (cat_items) is the result of a sort of vector multiplication of Titles (cat_titles) and CTGs plus any items in stock.

This conceptualization no longer works, as a SCM Title may have one or more SCM Groups -- e.g. if it has a set of standard sizes (like S-3X) but is also available in super-large sizes (4X+).

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