postgre modification detection algorithm

plugins/dbgate-plugin-postgres/src/backend/sql/tableModifications.js

@@ -1,54 +1,28 @@
 module.exports = `
-with pkey as
-(
-    select cc.conrelid, 'create constraint ' || cc.conname || ' primary key(' || 
-      string_agg(a.attname, ', ' order by array_position(cc.conkey, a.attnum)) || ');\\n'
-      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
+select infoTables.table_schema as "schemaName", infoTables.table_name as "pureName", 
+    (
+        select md5(string_agg(
+            infoColumns.column_name || '|' || infoColumns.data_type || '|' || infoColumns.is_nullable || '|' || coalesce(infoColumns.character_maximum_length, -1)
+                || '|' || coalesce(infoColumns.numeric_precision, -1),
+            ',' order by infoColumns.ordinal_position
+        )) as "hashCodeColumns"
+        from information_schema.columns infoColumns 
+        where infoColumns.table_schema = infoTables.table_schema and infoColumns.table_name = infoTables.table_name
+    ),
+    (
+        select md5(string_agg(
+            infoConstraints.constraint_name || '|' || infoConstraints.constraint_type ,
+            ',' order by infoConstraints.constraint_name
+        )) as "hashCodeConstraints"
+        from information_schema.table_constraints infoConstraints 
+        where infoConstraints.table_schema = infoTables.table_schema and infoConstraints.table_name = infoTables.table_name
     )
-    , E',\\n'
-  ) || E'\\n);\\n' || coalesce((select pkey from pkey where pkey.conrelid = oid),'NO_PK')) as "hashCode"
-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
-inner join information_schema.tables on tables.table_schema = tabledefinition.nspname and tables.table_name = tabledefinition.relname 
-and tables.table_type not like '%VIEW%'
-where ('tables:' || nspname || '.' ||  relname) =OBJECT_ID_CONDITION
-group by relname, nspname, oid
+    
+from information_schema.tables infoTables 
+where infoTables.table_type not like '%VIEW%' 
+  and ('tables:' || infoTables.table_schema || '.' ||  infoTables.table_name) =OBJECT_ID_CONDITION
+and infoTables.table_schema <> 'pg_catalog'
+and infoTables.table_schema <> 'information_schema'
+and infoTables.table_schema <> 'pg_internal'
+and infoTables.table_schema !~ '^pg_toast'
 `;