update migrations to support pg

nexus/Database/NexusDB.php

@@ -461,6 +461,30 @@ class NexusDB
         return nexus_config('nexus.database.default');
     }
 
+    public static function isMysql(): bool
+    {
+        return self::getConnectionName() === 'mysql';
+    }
+
+    public static function isPgsql(): bool
+    {
+        return self::getConnectionName() === 'pgsql';
+    }
+
+    public static function listColumnIndexNames(string $table, array $columns): array
+    {
+        $indexes = Schema::getIndexes($table);
+        $indexesNames = [];
+        foreach ($indexes as $index) {
+            foreach ($columns as $columnName) {
+                if (in_array($columnName, $index['columns'])) {
+                    $indexesNames[] = $index['name'];
+                }
+            }
+        }
+        return $indexesNames;
+    }
+
 
 
 }

nexus/Install/Install.php

@@ -28,7 +28,7 @@ class Install
 
     protected $envNames = [
         'TIMEZONE',
-        'DB_HOST', 'DB_PORT', 'DB_USERNAME', 'DB_PASSWORD', 'DB_DATABASE',
+        'DB_CONNECTION', 'DB_HOST', 'DB_PORT', 'DB_USERNAME', 'DB_PASSWORD', 'DB_DATABASE',
         'REDIS_HOST', 'REDIS_PORT', 'REDIS_DB', 'REDIS_PASSWORD',
         'UID_STARTS',
     ];
@@ -483,6 +483,10 @@ class Install
                 $item['type'] = 'select';
                 $item['options'] = $this->listTimeZone();
             }
+            if ($name == 'DB_CONNECTION') {
+                $item['type'] = 'select';
+                $item['options'] = ['mysql', 'pgsql'];
+            }
             $formControls[] = $item;
         }