influence/backend/app/Models/LoginModel.php

<?php
  // app/Models/LoginModel.php
  namespace App\Models;
  
  use Config\Database;
  
  class LoginModel
  {
    /**
     * 로그인 타입에 맞는 쿼리 빌더를 반환합니다.
     * @param string $loginType ('vendor' or 'influence')
     * @return \CodeIgniter\Database\BaseBuilder
     */
    public function getBuilderFor(string $loginType)
    {
      $db = Database::connect();
      $tableName = '';
      
      switch ($loginType) {
        case 'vendor':
          $tableName = 'VENDOR_LIST';
          break;
        case 'influence':
          $tableName = 'USER_LIST';
          break;
        case 'brand':
          $tableName = 'BRAND_LIST';
          break;
        default:
          throw new \InvalidArgumentException("Invalid login type provided: " . $loginType);
      }
      
      return $db->table($tableName);
    }
  }