From 8037d4efb1097c51dd68c1266ca828e494f8f311 Mon Sep 17 00:00:00 2001
From: lsces <lester@lsces.co.uk>
Date: Wed, 4 Feb 2026 19:55:50 +0000
Subject: Not as good as ADOdb, but functional in adding auto-increment column
 to table

---
 src/Schema/Grammars/FirebirdGrammar.php | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/Schema/Grammars/FirebirdGrammar.php b/src/Schema/Grammars/FirebirdGrammar.php
index 17037fb..221a5f7 100755
--- a/src/Schema/Grammars/FirebirdGrammar.php
+++ b/src/Schema/Grammars/FirebirdGrammar.php
@@ -311,6 +311,22 @@ class FirebirdGrammar extends Grammar
         }
     }
 
+    /**
+     * Get the SQL for an auto-increment column modifier.
+     *
+     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
+     * @param  \Illuminate\Support\Fluent  $column
+     * @return string|null
+     */
+    protected function modifyIncrement(Blueprint $blueprint, Fluent $column)
+    {
+        if (in_array($column->type, $this->serials) && $column->autoIncrement) {
+            return $this->hasCommand($blueprint, 'primary') || ($column->change && ! $column->primary)
+                ? ' unique'
+                : ' generated BY DEFAULT as identity primary key';
+        }
+    }
+
     /**
      * Create the column definition for a char type.
      *
-- 
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