JPA 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...
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 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 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 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...
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