From 0bf326d79f94a1613e5756ad1217d256329363bb Mon Sep 17 00:00:00 2001
From: tpylak <tpylak>
Date: Mon, 15 Sep 2008 12:32:53 +0000
Subject: [PATCH] LMS-586 add "if exists" check to fix bub in db migration to
 v023

SVN: 8315
---
 .../sql/postgresql/migration/migration-025-026.sql | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/openbis/source/sql/postgresql/migration/migration-025-026.sql b/openbis/source/sql/postgresql/migration/migration-025-026.sql
index 330d09726ff..57dba57f57f 100644
--- a/openbis/source/sql/postgresql/migration/migration-025-026.sql
+++ b/openbis/source/sql/postgresql/migration/migration-025-026.sql
@@ -1,7 +1,19 @@
 -- JAVA ch.systemsx.cisd.lims.server.dataaccess.migration.MigrationStepFrom025To026
 -- Remove ID column from SAMPLE_INPUTS table
 DROP SEQUENCE SAMPLE_INPUT_ID_SEQ;
-ALTER TABLE SAMPLE_INPUTS DROP CONSTRAINT SAIN_PK;
+-- There was a bug in migration to db 23 - the constraint was not created. So we drop it only if it exists.
+create function remove_sain_pk_constraint() returns void AS $$
+begin
+   perform *
+     FROM information_schema.table_constraints WHERE constraint_name='sain_pk';
+   if found
+   then
+	ALTER TABLE SAMPLE_INPUTS DROP CONSTRAINT SAIN_PK;
+   end if;
+end;
+$$ language 'plpgsql';
+select remove_sain_pk_constraint();
+drop function remove_sain_pk_constraint();
 ALTER TABLE SAMPLE_INPUTS DROP COLUMN ID;
 ALTER TABLE SAMPLE_INPUTS ADD CONSTRAINT SAIN_PK PRIMARY KEY(SAMP_ID,PROC_ID);
 
-- 
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