postgresql 16 release (#295)

Author: alikon

src/Pgsql/PgsqlDriver.php

@@ -111,7 +111,13 @@ public function connect()
      */
     public function getCollation()
     {
-        $this->setQuery('SHOW LC_COLLATE');
+        // https://www.postgresql.org/docs/current/release-16.html
+        if (version_compare($this->getVersion(), '16.0', '>=')) {
+            $this->setQuery('SELECT datcollate AS lc_collate FROM pg_database WHERE datname = current_database()');
+        } else {
+            $this->setQuery('SHOW LC_COLLATE');
+        }
+
         $array = $this->loadAssocList();
 
         return $array[0]['lc_collate'];
@@ -127,7 +133,13 @@ public function getCollation()
      */
     public function getConnectionCollation()
     {
-        $this->setQuery('SHOW LC_COLLATE');
+        // https://www.postgresql.org/docs/current/release-16.html
+        if (version_compare($this->getVersion(), '16.0', '>=')) {
+            $this->setQuery('SELECT datcollate AS lc_collate FROM pg_database WHERE datname = current_database()');
+        } else {
+            $this->setQuery('SHOW LC_COLLATE');
+        }
+
         $array = $this->loadAssocList();
 
         return $array[0]['lc_collate'];