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i have unit tests, written in java, that generates some data and saves it in DB. once in a while, the machine performance is slow due to lots of data in this DB, so we need to delete this data once in a while. this data is need for internal proccess so it needs to be saved for a while. in addition, there is lots of duplicated records. I thought to generate a hashed primary key, from my unit tests suit, before saving this data to avoid duplications. the PK needs to be 64 bit (java's long data type). I can't find any ways to generate this type of hashed PK in 64 bit as pure positive number. java's built in method "Objects.hash()" returns int. I need it to be long type.

any help will be appriciated!

Jessi
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  • Are you asking how to create a random, positive `long` in Java? – Abra Oct 07 '21 at 08:02
  • not random, but hashed - according to some of record's fields. it needs to be long positive number – Jessi Oct 07 '21 at 08:03
  • Does this help? https://stackoverflow.com/questions/9309723/how-can-i-generate-a-long-hash-of-a-string – Abra Oct 07 '21 at 08:06
  • @abra i think it does! but do you know why 2^32* hash1(s) + hash2(s) as mentioned there is a good hashing method? and how can i assure that the result does not exceed 64 bit (java's long data type) ? – Jessi Oct 07 '21 at 09:23

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