While for the default STRING discriminator, you don’t need to specify a certain value for each subclass entity since the class name is used, for INTEGER discriminator type, each subclass entity must provide a with a unique integer value.

Notice the annotation which declares that an INTEGER discriminator is expected in the topic_type_id column which is of type TINYINT(1). Getters and setters omitted for brevity

Private String Date createdOn = new = FetchType.LAZY) I thought id share this as this remix seems to be very hard to find online these days - doesnt even seem to be available at any of the online music stores. The Topic base class entity is mapped as = DiscriminatorType.INTEGER, The Topic, Post, and Announcement class hierarchy is mapped onto a single table in the database: In this article, I’m going to explain how you can get the most out of the INTEGER DiscriminatorType while still retaining the descriptiveness of the default STRING DiscriminatorType.Ĭonsidering we have following entities in our system: On the other hand, if the discriminator column is a TINYINT (only 1 byte is needed to store a discriminator value), we need only 96 MB (1 + 100 million bytes). If the discriminator type column is indexed and we store 1 million Announcement and 100 million Post entities, the index will require 393 MB (12 + 400 million bytes). After releasing a single for the local Tavdash label in 1990, they eventually signed with Jive Records in 1991 and released their debut album, Born Into the '90s, in 1992. For the Announcement class, we need at least 12 bytes to store the entity class name while for the Post entity, 4 bytes are required. Public Announcement, originally known as MGM, is an R&B and hip hop group formed in Chicago, Illinois, in 1989 by R.

However, the default STRING DiscriminatorType expects a VARCHAR column that must hold the longest entity subclass name. Public Announcement, originally known as MGM, is an R&B and hip hop group formed in Chicago, Illinois, in 1989 by R. So, because we are filtering by the discriminator column, we might want to index it or include it to speed up queries. Hibernate generates a SQL query which filters by the associated discriminator column (e.g. However, for JPQL query such as this one: Follow you are trading Stocks and Crypto using Revolut, then you are going to loveĪs previously explained, the SINGLE_TABLE inheritance is the most efficient entity inheritance strategy.

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