Answer by Vlad Mihalcea for JPA Embeddeble PK and nullable field
Since you must not use null in your PK, this is what you should do:Add a surrogate primary key. You can still achieve the uniqueness constraint and the default PK index with a parial index (in...
View ArticleAnswer by Karibasappa G C for JPA Embeddeble PK and nullable field
JPA guideline or "common sense" not allowed to use nullable fields for EmbeddebedId? If not, what annotions or logic do i need to add to make it work without adding another PK? answer is as...
View ArticleAnswer by Grim for JPA Embeddeble PK and nullable field
Usually a compound pk is not allowed to have null-values in the database.Technically we would say: Why not, a null can be a value too. The DB-Analyst would ask: Ok, if i sort 1,2,3,4,null,5. Would you...
View ArticleAnswer by nazlo for JPA Embeddeble PK and nullable field
Take a look hereSeems, that answer that (NULL == NULL) -> false is about your question.
View ArticleJPA Embeddeble PK and nullable field
I have a table called "Attributes" which has a PK of 3 fields which can be null. In this case Style_no is not null but item_no and size_no are null.Is it possible to have a Embeddeble PK where fields...
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