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All the three things - pkColumnName valueColumnName pkColumnValue are confusing me.
Functionally, what is the difference between these three.
It would be great if some one draws a relevant table here and explains me
The schema is simple as a pie.
Have a look at the following table:
So, the layout is: pkColumnName = "PK_COLUMN" valueColumnName = "VALUE_COLUMN" pkColumnValue = "DETERMINANT2" (for example)
The idea is each row in the table represents certain entity and there must be the way to distinguish between entities (3 entities in the preceding example) [ February 09, 2008: Message edited by: Alex Kikhtenko ]
Joined: Oct 16, 2005
Thanks for that..
But its still unclear to me !!
Please explain the schema keeping in mind the example entiy in oreilly. Will be grateful
What is the CUST_ID in the Oreilly code? Please explain the schema with reference to the code in the book
Joined: Feb 09, 2008
Ok. Let's consider the book's example with Customer entity.
Suppose we have another one entity Product:
As you can see we want the both entities to use the same table GENERATOR_TABLE to hold their Primary-Key-Next-Value.
Suppose also we've just persisted 3 Customer entities and 8 Product entities into the DB.
In this case the GENERATOR_TABLE table would look like:
So obviously CUST_ID is necessary to distinguish it's primary key value from primery key value of Product entity bean.