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PK in item models in Hybris


While working with model, the property of modelservice amazes me is, if you search an item with PK, you’ll get the result. If the item is search in HMC or backoffice, while returning the search result, it also gives the type code. How is this possible? All the items are stored in single DB table? In that case also, how come when a deleted item is searched, it returns the type code? See the screen shot below where item is deleted and item search returns type code

Fig – 1: Searching item (System-Types-Items)
 
     Fig 2: The PK is appended with Type code defined in items.xml

PK is generated with the following combination.
  • ·       Type code
  •       Time stamp (create time)

If you make the PK in binary number and take last 14 digit and convert back to decimal and you’ll get the type code.
Consider the example I have. PK is 8842394501143. If I convert in Binary, it comes as
0000000000000000000010000000101011000111110010001000000000010111 (64 bit presentation).
Now, take out last 14 digit and comes as 00000000010111. Convert it in decimal and you’ll get the typecode (23). The 43rd bit represent if the PK is counter based (if the value is 1 which is in this example) or UUID based (if the value is 0).

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