fixes bug#21048

dev:wilian
qua:

git-svn-id: http://desenvolvimento.rjconsultores.com.br/repositorio/sco/BD/FlyWay/trunk@104589 d1611594-4594-4d17-8e1d-87c2c4800839

src/db/migration/V20201203_1036__mantis21048.sql

@@ -0,0 +1,7 @@
+declare 
+  column_exists exception;
+  pragma exception_init (column_exists , -01430);
+begin 
+  execute immediate 'ALTER TABLE EMPRESA ADD CODCONTPREVIDENCIA VARCHAR(8)';
+  exception when column_exists then null;
+end;

src/db/postgresql/migration/V20201203_1036__mantis21048.sql

@@ -0,0 +1,6 @@
+DO $$
+BEGIN
+  ALTER TABLE EMPRESA ADD CODCONTPREVIDENCIA VARCHAR(8);
+  EXCEPTION WHEN duplicate_column THEN NULL;
+END
+$$;