On 30 May 2017 at 13:02, Steve Ebersole <st...@hibernate.org> wrote: > For whatever reason JPA and a few of the databases do not categorize > coalesce and nullif as functions - hence the "not technically a function" > part. > > However in Hibernate I have defined them as functions for the sake of users > being able to plug in custom function templates.
Thanks, it's clear now. Sanne > > On Tue, May 30, 2017 at 5:14 AM Sanne Grinovero <sa...@hibernate.org> wrote: >> >> Hi Steve, >> just a curiosity; for `coalesce` and `nullif` you stated "not >> technically a function, but supported as such to allow overriding". >> >> What does it mean? >> >> Thanks! >> Sanne >> >> On 29 May 2017 at 22:29, Steve Ebersole <st...@hibernate.org> wrote: >> > Hibernate has always defined a set of functions that should always be >> > available on every Dialect/database. JPA formalized some of these, but >> > Hibernate still had a superset. So I wanted to formalize the complete >> > set >> > of supported functions. Here is the formalized list of what Hibernate >> > has >> > always considered the "supported list": >> > >> > - those defined by JPA >> > - abs >> > - avg >> > - concat >> > - count >> > - current_date >> > - current_time >> > - current_timestamp >> > - length >> > - locate >> > - lower >> > - max >> > - min >> > - mod >> > - sqrt >> > - substring >> > - sum >> > - trim >> > - upper >> > - Hibernate extensions >> > - bit_length >> > - coalesce - not technically a function, but supported as such to >> > allow overriding >> > - cast >> > - day - generally defined as `extract(day from ?1)` >> > - extract >> > - hour - generally defined as `extract(hour from ?1)` >> > - minute - generally defined as `extract(minute from ?1)` >> > - month - generally defined as `extract(month from ?1)` >> > - nullif - not technically a function, but supported as such to >> > allow >> > overriding >> > - second - generally defined as `extract(second from ?1)` >> > - str - generally defined as `cast(?1 as CHAR )` >> > - year - generally defined as `extract(year from ?1)` >> > >> > >> > Additions/subtractions anyone would like to discuss? >> > >> > One question I has was in regards to str being defined as `cast(?1 as >> > CHAR >> > )` by default - specifically using CHAR instead of VARCHAR. Some >> > databases >> > apply padding for the size of the datatype when casting a numeric to a >> > CHAR >> > which is not an unreasonable thing to do. >> > _______________________________________________ >> > hibernate-dev mailing list >> > hibernate-dev@lists.jboss.org >> > https://lists.jboss.org/mailman/listinfo/hibernate-dev _______________________________________________ hibernate-dev mailing list hibernate-dev@lists.jboss.org https://lists.jboss.org/mailman/listinfo/hibernate-dev
