v1.2.0 update column issue

app/Listeners/Updates/Version120.php

@@ -9,6 +9,8 @@ use App\Models\Company\Company;
 use App\Models\Expense\Bill;
 use App\Models\Income\Invoice;
 use App\Models\Setting\Category;
+use DB;
+use Schema;
 use Artisan;
 
 class Version120 extends Listener
@@ -36,6 +38,8 @@ class Version120 extends Listener
         Artisan::call('migrate', ['--force' => true]);
 
         $this->updateInvoicesAndBills();
+
+        $this->changeQuantityColumn();
     }
 
     protected function updatePermissions()
@@ -106,4 +110,28 @@ class Version120 extends Listener
             }
         }
     }
+
+    protected function changeQuantityColumn()
+    {
+        $connection = env('DB_CONNECTION');
+
+        if ($connection == 'mysql') {
+            $tables = [
+                env('DB_PREFIX') . 'invoice_items',
+                env('DB_PREFIX') . 'bill_items'
+            ];
+
+            foreach ($tables as $table) {
+                DB::statement("ALTER TABLE `$table` MODIFY `quantity` DOUBLE(7,2) NOT NULL");
+            }
+        } else {
+            Schema::table('invoice_items', function ($table) {
+                $table->decimal('quantity', 7, 2)->change();
+            });
+
+            Schema::table('bill_items', function ($table) {
+                $table->decimal('quantity', 7, 2)->change();
+            });
+        }
+    }
 }

database/migrations/2018_04_30_000000_change_quantity_column_invoice_bill_items.php

@@ -1,38 +0,0 @@
-<?php
-
-use Illuminate\Database\Migrations\Migration;
-
-class ChangeQuantityColumnInvoiceBillItems extends Migration
-{
-    /**
-     * Run the migrations.
-     *
-     * @return void
-     */
-    public function up()
-    {
-        Schema::table('invoice_items', function ($table) {
-            $table->double('quantity', 7, 2)->change();
-        });
-
-        Schema::table('bill_items', function ($table) {
-            $table->double('quantity', 7, 2)->change();
-        });
-    }
-
-    /**
-     * Reverse the migrations.
-     *
-     * @return void
-     */
-    public function down()
-    {
-        Schema::table('invoice_items', function ($table) {
-            $table->integer('quantity')->change();
-        });
-
-        Schema::table('bill_items', function ($table) {
-            $table->integer('quantity')->change();
-        });
-    }
-}