Fixed connection and version number detection issue when the database server is upgraded. Fixes #5507

docs/en_US/release_notes_4_23.rst

@@ -23,5 +23,6 @@ Bug fixes
 | `Issue #3787 <https://redmine.postgresql.org/issues/3787>`_ -  Disabled the Stop process button after clicking it and added a message 'Terminating the process...' to notify the user.
 | `Issue #5416 <https://redmine.postgresql.org/issues/5416>`_ -  Ensure that the query tool panel gets closed when clicking on the 'Don't Save' button.
 | `Issue #5465 <https://redmine.postgresql.org/issues/5465>`_ -  Fixed an issue where the Edge browser version is showing wrong and warning message gets displayed.
+| `Issue #5507 <https://redmine.postgresql.org/issues/5507>`_ -  Fixed connection and version number detection issue when the database server is upgraded.
 | `Issue #5521 <https://redmine.postgresql.org/issues/5521>`_ -  Fixed an issue when dumping servers from a desktop pgAdmin app by providing an option '--sqlite-path'.
 | `Issue #5539 <https://redmine.postgresql.org/issues/5539>`_ -  Fixed typo in exception keyword.

web/pgadmin/utils/driver/psycopg2/connection.py

@@ -439,28 +439,28 @@ class Connection(BaseConnection):
                         "Failed to setup the role with error message:\n{0}"
                     ).format(status)
 
-        if manager.ver is None:
-            status = _execute(cur, "SELECT version()")
+        # Check database version every time on reconnection
+        status = _execute(cur, "SELECT version()")
 
-            if status is not None:
-                self.conn.close()
-                self.conn = None
-                self.wasConnected = False
-                current_app.logger.error(
-                    "Failed to fetch the version information on the "
-                    "established connection to the database server "
-                    "(#{server_id}) for '{conn_id}' with below error "
-                    "message:{msg}".format(
-                        server_id=self.manager.sid,
-                        conn_id=conn_id,
-                        msg=status)
-                )
-                return False, status
+        if status is not None:
+            self.conn.close()
+            self.conn = None
+            self.wasConnected = False
+            current_app.logger.error(
+                "Failed to fetch the version information on the "
+                "established connection to the database server "
+                "(#{server_id}) for '{conn_id}' with below error "
+                "message:{msg}".format(
+                    server_id=self.manager.sid,
+                    conn_id=conn_id,
+                    msg=status)
+            )
+            return False, status
 
-            if cur.rowcount > 0:
-                row = cur.fetchmany(1)[0]
-                manager.ver = row['version']
-                manager.sversion = self.conn.server_version
+        if cur.rowcount > 0:
+            row = cur.fetchmany(1)[0]
+            manager.ver = row['version']
+            manager.sversion = self.conn.server_version
 
         status = _execute(cur, """
 SELECT

web/pgadmin/utils/driver/psycopg2/server_manager.py

@@ -263,9 +263,6 @@ WHERE db.oid = {0}""".format(did))
 
         from pgadmin.browser.server_groups.servers.types import ServerType
 
-        self.ver = data.get('ver', None)
-        self.sversion = data.get('sversion', None)
-
         if self.ver and not self.server_type:
             for st in ServerType.types():
                 if st.instanceOf(self.ver):