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

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==Navigation==
 
[[VbzCart]]: [[VbzCart catalog building|catalog building]]
 
 
==Version==
 
==Version==
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]].
+
This is a tricky process which has been revised multiple times.
==Process==
 
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.
 
# Update the list of all catalog-based items ([calc Items Updates saved])
 
#* [[#(Step 1) qryVb_Items_updates_append]] -- Add any new items to [calc Items Updates saved]
 
#** [[#(Step 1a) qryVb_Items_updates_new]] -- in-print items that are new
 
#*** [[#(Step 1aa) qryVb_Items_updates]] -- all the items currently available from suppliers (in print)
 
#** [[#(Step 1b) qryVb_Items_updates_copy_fields]]
 
# 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]
 
#* [[#(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.
 
#** [[#(Step 2a) qryVb_Items_results]]
 
# Fill in any blank ID_Item fields in [calc Items Updates saved] records:
 
#* [[#(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).
 
# Copy calculated item data over to [cat_items]:
 
#* [[#(Step 4) qryVb_Items_results_update]]
 
# Final flag updates:
 
#* [[#(Step 5) qryVb_Items_update_final]]
 
#** Clear isInPrint flag for cat_items not found in calculated in-print listing
 
#** Set isForSale for cat_items with stock for sale
 
#** Update stock quantities for all cat_items
 
# Housekeeping: mark table as updated so cached tables get recalculated
 
#* [[#(Step 6) qryVb_Items_mark_updated]]
 
  
==SQL - queries - 2008==
+
* {{l/sub|2017}} version - 2016 code apparently never really got finished, and the Items table needs some flag changes
2008-03-15: Completely rewriting the building sequence again...
+
* {{l/sub|2016}} version - webified version of 2010, with rules finally documented
 +
* '''2010''' version: see {{l/vbzcart/code|maint/build-cat.php}}
 +
* {{l/sub|2009}} version - SQL statements executed directly from PHP code
 +
* {{l/sub|2008}} version - started in 2007 - a set of stored queries called from a stored procedure
 +
* {{l/sub|2006}} version
  
* {{vbzcart/query|qryCtg_src_sub}}
+
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:
* {{vbzcart/query|qryCtg_src}}
+
<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.
* {{vbzcart/query|qryCtg_Items_forUpdJoin}}
+
</blockquote>
* {{vbzcart/query|qryCtg_Upd_join}}
+
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+).
* {{vbzcart/query|qryCtg_src_dups}}
 
* {{vbzcart|proc|doCtgUpdate}}: the main building process - details are documented there too
 
* {{vbzcart/query|qryCtgCk_dup_keys}}: looks for duplicate IDS_Items
 
 
 
==SQL - queries==
 
These are from the MS Access 97 version, gradually being honed down for migration to MySQL
 
===(Step 1a) qryVb_Items_updates_new===
 
<sql>SELECT c.*
 
FROM qryCtg_Items_updates_joinable AS c LEFT JOIN ctg_updates AS s
 
ON c.IDS_Item=s.IDS_Item
 
WHERE s.IDS_Item IS NULL;</sql>
 
 
 
===(Step 1) qryVb_Items_updates_append===
 
<sql>INSERT INTO ctg_updates (
 
  ID_Item,
 
  IDS_Item,
 
  CatNum,
 
  CatSfx,
 
  ID_Title,
 
  ID_CTG_Group,
 
  ID_CTG_Title,
 
  ID_CTG_Item,
 
  ID_ItTyp,
 
  ID_ItOpt )
 
SELECT
 
  0 AS ID_Item,
 
  IDS_Item,
 
  CatNum,
 
  CatSfx,
 
  ID_Title,
 
  ID_TGroup,
 
  ID_TGTitle,
 
  ID_TGItem,
 
  ID_ItTyp,
 
  ID_ItOpt
 
FROM qryVb_Items_Updates_new;
 
</sql>
 
===(Step 2) qryVb_Items_results_append===
 
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.
 
<sql>INSERT INTO cat_items (
 
  CatNum,
 
  isForSale,
 
  isMaster,
 
  isInPrint,
 
  isCloseOut,
 
  ID_ItTyp,
 
  ID_ItOpt,
 
  ItOpt_Descr,
 
  ItOpt_Sort,
 
  ID_ShipCost,
 
  PriceBuy,
 
  PriceSell,
 
  PriceList )
 
SELECT
 
  r.CatNum,
 
  r.isForSale,
 
  FALSE AS isMaster,
 
  r.isInPrint,
 
  r.isCloseOut,
 
  r.ID_ItTyp,
 
  r.ID_ItOpt,
 
  r.ItOpt_Descr,
 
  r.ItOpt_Sort,
 
  r.ID_ShipCost,
 
  r.PriceBuy,
 
  r.PriceSell,
 
  r.PriceList
 
FROM qryCtg_Items_updates AS r LEFT JOIN cat_items AS i ON r.ID_Item=i.ID
 
WHERE i.ID IS NULL;
 
</sql>
 
 
 
===(Step 3) qryVb_Items_updates_index_new===
 
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).
 
<sql>UPDATE
 
  ctg_updates AS s LEFT JOIN
 
  cat_items AS i
 
ON i.CatNum=s.CatNum
 
SET
 
  s.ID_Item = i.ID,
 
  isForSale = FALSE,
 
  isInPrint = FALSE
 
WHERE
 
  s.ID_Item IS NULL;
 
</sql>
 
 
 
===(Step 4) qryVb_Items_results_update===
 
<sql>UPDATE
 
  qryCtg_build AS r LEFT JOIN
 
  cat_items AS i
 
ON
 
  r.ID_Item=i.ID
 
SET
 
  i.CatNum = r.CatNum,
 
  i.isForSale = r.isForSale,
 
  i.isInPrint = r.isInPrint,
 
  i.isCloseOut = r.isCloseOut,
 
  i.isPulled = FALSE,
 
  i.isDumped = FALSE,
 
  i.ID_ItTyp = r.ID_ItTyp,
 
  i.ID_ItOpt = r.ID_ItOpt,
 
  i.ItOpt_Descr = iif(r.ItOpt_Descr IS NULL,i.ItOpt_Descr,r.ItOpt_Descr),
 
  i.ItOpt_Sort = r.ItOpt_Sort,
 
  i.ID_ShipCost = r.ID_ShipCost,
 
  i.PriceBuy = r.PriceBuy,
 
  i.PriceSell = r.PriceSell,
 
  i.PriceList = r.PriceList,
 
  i.GrpCode = r.GrpCode,
 
  i.GrpDescr = r.GrpDescr,
 
  i.GrpSort = r.GrpSort,
 
  i.CatSfx = r.CatSfx
 
WHERE r.ID_Item IS NOT NULL;
 
</sql>
 
 
 
Changes:
 
* Must clear isPulled and isDumped, in case pulled items are returned to service
 
===(Step 5) qryVb_Items_update_final===
 
* Clear isInPrint flag for cat_items not found in calculated in-print listing
 
* Set isForSale for cat_items with stock for sale
 
* Update stock quantities for all cat_items
 
<sql>UPDATE
 
  (cat_items AS i LEFT JOIN qryCtg_build AS r ON r.ID_Item=i.ID)
 
  LEFT JOIN v_stk_items_remaining AS s ON s.ID_Item=i.ID
 
SET
 
  i.isInPrint = nz(r.isInPrint),
 
  i.isCloseOut = nz(r.isCloseOut),
 
  i.isForSale = nz(r.isInPrint)
 
      OR nz(r.isCloseOut)
 
      OR (nz(s.QtyForSale) > 0),
 
  i.qtyInStock = nz(s.QtyForSale);
 
</sql>
 
===(Step 6) qryVb_Items_mark_updated===
 
<sql>UPDATE
 
  data_tables
 
SET WhenUpdated=Now()
 
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+).