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[Bug 1517658] Re: Upgrade to 1.10+ fails on Postgres <9.1

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** Changed in: mahara/15.10
       Status: In Progress => Fix Committed

** Changed in: mahara/15.04
       Status: In Progress => Confirmed

** Changed in: mahara/15.04
       Status: Confirmed => Fix Committed

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https://bugs.launchpad.net/bugs/1517658

Title:
  Upgrade to 1.10+ fails on Postgres <9.1

Status in Mahara:
  Fix Committed
Status in Mahara 1.10 series:
  Fix Committed
Status in Mahara 15.04 series:
  Fix Committed
Status in Mahara 15.10 series:
  Fix Committed
Status in Mahara 16.04 series:
  Fix Committed

Bug description:
  Upgrading from 1.5.1 to versions higher than 1.9 (either directly or incrementally by version) fails on Postgres 8.4.
  (And I'm assuming any version of Postgres prior to 9.1.)

  Existing installation of Mahara 1.5.1.
  Run through normal upgrade steps.
  Expected result: Successful upgrade.
  Actual result: upgrade screen reports this error in core upgrade section:

  Could not execute command: UPDATE "artefact" SET path = CONCAT('/', id) WHERE id IN (SELECT id FROM "artefact" WHERE path IS NULL AND parent IS NULL LIMIT 200)
  Call stack (most recent first):
     * execute_sql("UPDATE {artefact} SET path = CONCAT('/', id) WHERE...") at /srv/www/mahara/mahara-15.10.0/htdocs/lib/db/upgrade.php:3340
     * xmldb_core_upgrade("2012080604") at /srv/www/mahara/mahara-15.10.0/htdocs/lib/upgrade.php:359
     * upgrade_core(object(stdClass)) at /srv/www/mahara/mahara-15.10.0/htdocs/admin/upgrade.json.php:90

  Errors from Apache logs:

  [DBG] 25 (lib/db/upgrade.php:3274) Filling in parent artefact paths, referer: https://HOSTNAME/admin/upgrade.php
  [Tue Nov 17 16:11:01 2015] [error] [client --removed--] [DBG] 25 (lib/dml.php:147) postgres7 error: [-1: ERROR:  function concat(unknown, bigint) does not exist, referer: https://HOSTNAME/admin/upgrade.php
  [Tue Nov 17 16:11:01 2015] [error] [client --removed--] [DBG] 25 (lib/dml.php:147) LINE 1: UPDATE "artefact" SET path = CONCAT('/', id) WHERE id IN (SE..., referer: https://HOSTNAME/admin/upgrade.php
  [Tue Nov 17 16:11:01 2015] [error] [client --removed--] [DBG] 25 (lib/dml.php:147)                                      ^, referer: https://HOSTNAME/admin/upgrade.php
  [Tue Nov 17 16:11:01 2015] [error] [client --removed--] [DBG] 25 (lib/dml.php:147) HINT:  No function matches the given name and argument types. You might need to add explicit type casts.] in adodb_throw(UPDATE "artefact" SET path = CONCAT('/', id) WHERE id IN (SELECT id FROM "artefact" WHERE path IS NULL AND parent IS NULL LIMIT 200), ), referer: https://HOSTNAME/admin/upgrade.php
  [Tue Nov 17 16:11:01 2015] [error] [client --removed--] [DBG] 25 (lib/dml.php:147) Command was: UPDATE "artefact" SET path = CONCAT('/', id) WHERE id IN (SELECT id FROM "artefact" WHERE path IS NULL AND parent IS NULL LIMIT 200), referer: https://HOSTNAME/admin/upgrade.php
  [Tue Nov 17 16:11:01 2015] [error] [client --removed--] [WAR] 25 (lib/errors.php:745) Could not execute command: UPDATE "artefact" SET path = CONCAT('/', id) WHERE id IN (SELECT id FROM "artefact" WHERE path IS NULL AND parent IS NULL LIMIT 200), referer: https://HOSTNAME/admin/upgrade.php
  [Tue Nov 17 16:11:01 2015] [error] [client --removed--] Call stack (most recent first):, referer: https://HOSTNAME/admin/upgrade.php
  [Tue Nov 17 16:11:01 2015] [error] [client --removed--]   * log_message("Could not execute command: UPDATE "artefact" SET p...", 8, true, true) at /srv/www/mahara/mahara-1.10.7/htdocs/lib/errors.php:95, referer: https://HOSTNAME/admin/upgrade.php
  [Tue Nov 17 16:11:01 2015] [error] [client --removed--]   * log_warn("Could not execute command: UPDATE "artefact" SET p...") at /srv/www/mahara/mahara-1.10.7/htdocs/lib/errors.php:745, referer: https://HOSTNAME/admin/upgrade.php
  [Tue Nov 17 16:11:01 2015] [error] [client --removed--]   * SQLException->__construct("Could not execute command: UPDATE "artefact" SET p...") at /srv/www/mahara/mahara-1.10.7/htdocs/lib/dml.php:148, referer: https://HOSTNAME/admin/upgrade.php
  [Tue Nov 17 16:11:01 2015] [error] [client --removed--]   * execute_sql("UPDATE {artefact} SET path = CONCAT('/', id) WHERE...") at /srv/www/mahara/mahara-1.10.7/htdocs/lib/db/upgrade.php:3290, referer: https://HOSTNAME/admin/upgrade.php
  [Tue Nov 17 16:11:01 2015] [error] [client --removed--]   * xmldb_core_upgrade("2014032729") at /srv/www/mahara/mahara-1.10.7/htdocs/lib/upgrade.php:359, referer: https://HOSTNAME/admin/upgrade.php
  [Tue Nov 17 16:11:01 2015] [error] [client --removed--]   * upgrade_core(object(stdClass)) at /srv/www/mahara/mahara-1.10.7/htdocs/admin/upgrade.json.php:86, referer: https://HOSTNAME/admin/upgrade.php

  (Why does it say "postgres7 error" above?)

  It looks like it's asking Postgres to use the CONCAT function which, as far as I'm aware, did not exist in Postgres until 9.1. 
  http://www.postgresql.org/docs/8.4/static/functions-string.html
  http://www.postgresql.org/docs/9.1/static/functions-string.html

  Mahara explicitly states that it's supported on "PostgreSQL, all
  versions from 8.3" (
  https://wiki.mahara.org/wiki/System_Administrator's_Guide/Requirements#Database_Server
  )

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References

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