Create an in-memory database structure from an Oracle instance

Question

I have an application where many \"unit\" tests use a real connection to an Oracle database during their execution.

As you can imagine, these tests take too muc

Answer 1

Latest HSQLDB 2.0.1 supports ORACLE syntax for DUAL, ROWNUM, NEXTVAL and CURRVAL via a syntax compatibility flag, sql.syntax_ora=true. In the same manner, concatenation of a string with a NULL string and restrictions on NULL in UNIQUE constraints are handled with other flags. Most ORACLE functions such as TO_CHAR, TO_DATE, NVL etc. are already built in.

At the moment, to use simple ORACLE types such as NUMBER, you can use a type definition:

CREATE TYPE NUMBER AS NUMERIC

The next snapshot will allow NUMBER(N) and other aspects of ORACLE type compatibility when the flag is set.

Download from http://hsqldb.org/support/

[Update:] The snapshot issued on Oct 4 translates most Oracle specific types to ANSI SQL types. HSQLDB 2.0 also supports the ANSI SQL INTERVAL type and date / timestamp arithmetic the same way as Oracle.