Add LOCK=SHARED

Author: fogelito

src/Database/Adapter/MariaDB.php

@@ -2214,4 +2214,9 @@ public function getSupportForOptionalSpatialAttributeWithExistingRows(): bool
     {
         return true;
     }
+
+    public function getLockType(): string
+    {
+        return ',LOCK=SHARED';
+    }
 }

src/Database/Adapter/SQL.php

@@ -248,7 +248,7 @@ public function createAttribute(string $collection, string $id, string $type, in
     {
         $id = $this->quote($this->filter($id));
         $type = $this->getSQLType($type, $size, $signed, $array, $required);
-        $sql = "ALTER TABLE {$this->getSQLTable($collection)} ADD COLUMN {$id} {$type};";
+        $sql = "ALTER TABLE {$this->getSQLTable($collection)} ADD COLUMN {$id} {$type} {$this->getLockType()};";
         $sql = $this->trigger(Database::EVENT_ATTRIBUTE_CREATE, $sql);
 
         try {
@@ -260,6 +260,11 @@ public function createAttribute(string $collection, string $id, string $type, in
         }
     }
 
+    public function getLockType(): string
+    {
+        return '';
+    }
+
     /**
      * Create Attributes
      *
@@ -285,7 +290,7 @@ public function createAttributes(string $collection, array $attributes): bool
 
         $columns = \implode(', ADD COLUMN ', $parts);
 
-        $sql = "ALTER TABLE {$this->getSQLTable($collection)} ADD COLUMN {$columns};";
+        $sql = "ALTER TABLE {$this->getSQLTable($collection)} ADD COLUMN {$columns} {$this->getLockType()};";
         $sql = $this->trigger(Database::EVENT_ATTRIBUTE_CREATE, $sql);
 
         try {