postgresql-libversion

PostgreSQL extension with support for version string comparison through libversion.

API

The extension implements:

• version_compare2(text, text) function which takes two strings, compares them as versions and returns integer -1 if second version is greater, 1 if first version is greater and 0 if versions are equal.
• version_compare4(text, text, int, int), which does the same, additionally allowing to specify flags for either side of comparison to tune it. See libversion documentation for complete description of flags. Here, flag values are provided as functions:
  • VERSIONFLAG_P_IS_PATCH(),
  • VERSIONFLAG_ANY_IS_PATCH()
  • VERSIONFLAG_LOWER_BOUND()
  • VERSIONFLAG_UPPER_BOUND()
• versiontext type which behaves just like text, but compares as version strings.

Synopsis

CREATE EXTENSION libversion;
# CREATE EXTENSION

SELECT version_compare2('1.10', '1.2');
# 1

SELECT version_compare2('1.0', '1.0.0');
# 0

SELECT version_compare4('1.0p1', '1.0', VERSIONFLAG_P_IS_PATCH(), 0);
# 1

SELECT '1.10'::versiontext > '1.2'::versiontext;
# t

SELECT '1.0'::versiontext = '1.0.0'::versiontext;
# t

Installation

The extension uses standard PostgreSQL Makefile infrastructure.

Run

make && make install

to build and install. The build requires libversion and pkgconfig installed.

Author

• Dmitry Marakasov amdmi3@amdmi3.ru
• Contains code from PostgreSQL 9.6 citext extension

License

MIT