PHRAS-3814 do not update table if exist and not empty

lib/classes/patch/416RC3PHRAS3602.php

@@ -1,6 +1,8 @@
 <?php
 
 use Alchemy\Phrasea\Application;
+use Doctrine\ORM\EntityManager;
+use Doctrine\ORM\Query\ResultSetMapping;
 
 class patch_416RC3PHRAS3602 implements patchInterface
 {
@@ -63,24 +65,28 @@ private function patch_databox(base $databox, Application $app)
 
     private function patch_appbox(base $appbox, Application $app)
     {
-        $cnx = $appbox->get_connection();
-        $sqls = [
-            /**
-             * the sessions go directly to baskets, let's call this a "vote session" to not mispatch with former structure
-             */
-            "update Baskets b inner join ValidationSessions v on v.basket_id=b.id set
+        if ($this->tableExistsAndNotEmpty($app['orm.em'], 'BasketElementVotes')) {
+            // the table exist and not empty
+            return 0;
+        } else {
+            $cnx = $appbox->get_connection();
+            $sqls = [
+                /**
+                 * the sessions go directly to baskets, let's call this a "vote session" to not mispatch with former structure
+                 */
+                "update Baskets b inner join ValidationSessions v on v.basket_id=b.id set
 b.vote_initiator_id=v.initiator_id,
 b.vote_created=v.created,
 b.vote_updated=v.updated,
 b.vote_expires=v.expires",
 
-            /**
-             * the participants are now in relation with a basket
-             * nb: now a participant is kept unique to a basket, it was not the case before (very rare doubles ? bug ?)
-             *     we keep only the _most recent_ occurence ( max(p.id) )
-             * nb: we let the participant id unchanged because it's easier when copying "validationdatas"
-             */
-            "insert into BasketParticipants (id, user_id, basket_id, can_modify, 
+                /**
+                 * the participants are now in relation with a basket
+                 * nb: now a participant is kept unique to a basket, it was not the case before (very rare doubles ? bug ?)
+                 *     we keep only the _most recent_ occurence ( max(p.id) )
+                 * nb: we let the participant id unchanged because it's easier when copying "validationdatas"
+                 */
+                "insert into BasketParticipants (id, user_id, basket_id, can_modify, 
                                 is_aware, is_confirmed, can_agree, can_see_others, reminded)
 select vp_id as id, user_id, basket_id, 0 as can_modify, is_aware, is_confirmed, can_agree, can_see_others, reminded from 
 (
@@ -94,23 +100,36 @@ private function patch_appbox(base $appbox, Application $app)
 ) as a
 inner join ValidationParticipants p on p.id=a.vp_id order by vp_id asc",
 
-            /**
-             * the "datas" are now "votes"
-             * we don't copy orphan data
-             * nb: we let the id unchanged
-             */
-            "insert into BasketElementVotes (id, participant_id, basket_element_id, agreement, note, updated)
+                /**
+                 * the "datas" are now "votes"
+                 * we don't copy orphan data
+                 * nb: we let the id unchanged
+                 */
+                "insert into BasketElementVotes (id, participant_id, basket_element_id, agreement, note, updated)
 SELECT d.id, d.participant_id, d.basket_element_id, d.agreement, d.note, d.updated
 FROM ValidationDatas d inner join BasketParticipants p on p.id=d.participant_id
 inner join BasketElements e on e.id=d.basket_element_id
 order by d.id asc",
 
-            "UPDATE `Baskets` SET `share_expires`=`vote_expires`
+                "UPDATE `Baskets` SET `share_expires`=`vote_expires`
 WHERE `share_expires` IS NULL AND `vote_expires` IS NOT NULL AND `vote_expires` < NOW();"
-        ];
+            ];
 
-        foreach($sqls as $sql) {
-            $cnx->exec($sql);
+            foreach($sqls as $sql) {
+                $cnx->exec($sql);
+            }
+            return 0;
         }
     }
+
+    private function tableExistsAndNotEmpty(EntityManager $em, $table)
+    {
+        $rsm = (new ResultSetMapping())
+            ->addScalarResult('Name', 'Name')
+            ->addScalarResult('Rows', 'Rows');
+
+        return (Boolean) $em->createNativeQuery(
+            'SHOW TABLE STATUS WHERE Name="'.$table.'" AND `Rows` >=1', $rsm
+        )->getOneOrNullResult();
+    }
 }