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One of jOOQ’s key features so far has always been to render pretty much exactly the SQL that users expect, without any surprises – unless some emulation is required to make a query work, of course. This means that while join elimination is a powerful feature of many RDBMS, it isn’t part of jOOQ’s feature […]
In MySQL, you cannot do this: create table t (i int primary key, j int); insert into t values (1, 1); update t set j = (select max(j) from t) + 1; The UPDATE statement will raise an error as follows: SQL Error [1093] [HY000]: You can’t specify target table ‘t’ for update in FROM […]
jOOQ’s DAO API is one of jOOQ’s most controversial features. When it was first implemented, it was implemented merely: Because it was so easy to implement Because it seemed so useful for simple CRUD tasks Because that’s what many developers want There’s a strong hint about the third bullet given how popular Spring Data’s repository […]
Java’s package private visibility is an underrated feature. When you omit any visibility modifier in Java, then the default (for most objects) is package private, i.e. the object is visible only to types in the same package: class YouDontSeeMe {} class YouDontSeeMeEither {} In fact, a compilation unit (the .java file) can contain multiple such […]
Microsoft T-SQL supports a language feature called table-valued parameter (TVP), which is a parameter of a table type that can be passed to a stored procedure or function. For example, you may write: CREATE TYPE u_number_table AS TABLE (column_value INTEGER); CREATE FUNCTION f_cross_multiply ( @numbers u_number_table READONLY ) RETURNS @result TABLE ( i1 INTEGER, i2 […]