db2fce

Overview

PGDG APT is complete for PG14-18; Pigsty RPM noarch spec fills the PGDG YUM gap for PG14-18.

Version

Build

You can build the RPM / DEB packages for db2fce using pig build:

pig build pkg db2fce         # build RPM / DEB packages

Install

You can install db2fce directly. First, make sure the PGDG and PIGSTY repositories are added and enabled:

pig repo add pgsql -u          # Add repo and update cache

Install the extension using pig or apt/yum/dnf:

• Install
• pig
• dnf
• apt

pig install db2fce;          # Install for current active PG version

pig ext install -y db2fce -v 18  # PG 18
pig ext install -y db2fce -v 17  # PG 17
pig ext install -y db2fce -v 16  # PG 16
pig ext install -y db2fce -v 15  # PG 15
pig ext install -y db2fce -v 14  # PG 14

dnf install -y db2fce_18       # PG 18
dnf install -y db2fce_17       # PG 17
dnf install -y db2fce_16       # PG 16
dnf install -y db2fce_15       # PG 15
dnf install -y db2fce_14       # PG 14

apt install -y postgresql-18-db2fce   # PG 18
apt install -y postgresql-17-db2fce   # PG 17
apt install -y postgresql-16-db2fce   # PG 16
apt install -y postgresql-15-db2fce   # PG 15
apt install -y postgresql-14-db2fce   # PG 14

Create Extension:

CREATE EXTENSION db2fce CASCADE;  -- requires: plpgsql

Usage

Sources: README, SQL objects, control file

db2fce provides a DB2 compatibility environment for PostgreSQL. It creates DB2-style functions, types, operators, and the SYSIBM.SYSDUMMY1 compatibility view so SQL originally written for IBM Db2 can be adapted with fewer changes.

Enable

CREATE EXTENSION db2fce;

SET search_path = db2, sysibm, public;

The extension creates most compatibility objects in the db2 schema and creates sysibm.sysdummy1 for DB2 queries that expect a dummy single-row table.

SELECT * FROM sysibm.sysdummy1;

Compatibility Functions

The db2 schema includes date/time helpers such as microsecond, second, minute, hour, day, month, year, days, months_between, date, time, and timestamp_format.

String and conversion helpers include locate, translate, lcase, upper, lower, strip, char, integer, int, double, decimal, dec, hex, round, digits, and value.

Operators

The SQL layer also defines DB2-style operators such as ^= for inequality and !! for concatenation across several data types.

SELECT db2.int('42');
SELECT db2.days(current_date);
SELECT 'db' !! '2';

Notes

Adding db2 to search_path lets many DB2 function calls work without schema qualification. Some names that conflict with PostgreSQL syntax or built-in behavior may still need explicit db2. qualification.