backend bundle refactor

packages/engines/postgres/sql/tableModifications.js

@@ -0,0 +1,52 @@
+module.exports = `
+with pkey as
+(
+    select cc.conrelid, format(E'create constraint %I primary key(%s);\\n', cc.conname,
+        string_agg(a.attname, ', ' 
+            order by array_position(cc.conkey, a.attnum))) pkey
+    from pg_catalog.pg_constraint cc
+        join pg_catalog.pg_class c on c.oid = cc.conrelid
+        join pg_catalog.pg_attribute a on a.attrelid = cc.conrelid 
+            and a.attnum = any(cc.conkey)
+    where cc.contype = 'p'
+    group by cc.conrelid, cc.conname
+)
+
+
+SELECT oid as "objectId", nspname as "schemaName", relname as "pureName",
+  md5('CREATE TABLE ' || nspname || '.' || relname || E'\\n(\\n' ||
+  array_to_string(
+    array_agg(
+      '    ' || column_name || ' ' ||  type || ' '|| not_null
+    )
+    , E',\\n'
+  ) || E'\\n);\\n' || (select pkey from pkey where pkey.conrelid = oid)) as "hash"
+from
+(
+  SELECT 
+    c.relname, a.attname AS column_name, c.oid,
+    n.nspname,
+    pg_catalog.format_type(a.atttypid, a.atttypmod) as type,
+    case 
+      when a.attnotnull
+    then 'NOT NULL' 
+    else 'NULL' 
+    END as not_null 
+  FROM pg_class c,
+   pg_namespace n,
+   pg_attribute a,
+   pg_type t
+
+   WHERE c.relkind = 'r'
+   AND a.attnum > 0
+   AND a.attrelid = c.oid
+   AND a.atttypid = t.oid
+   AND n.oid = c.relnamespace
+    AND n.nspname <> 'pg_catalog'
+    AND n.nspname <> 'information_schema'
+    AND n.nspname !~ '^pg_toast'
+ ORDER BY a.attnum
+) as tabledefinition
+where 'table:' || nspname || '.' ||  relname =[OBJECT_ID_CONDITION]
+group by relname, nspname, oid
+`;