code: public function repositoryExists(): bool
      {
          switch ($this->pdo->getAttribute(PDO::ATTR_DRIVER_NAME)) {
              case 'pgsql':
                  $sql = 'select count(*) from information_schema.tables 
                          where table_schema = current_schema() 
                          and table_name = ?';
                  break;
              case 'mysql':
                  $sql = 'select count(*) from information_schema.tables 
                          where table_schema = database() 
                          and table_name = ?';
                  break;
              case 'sqlsrv':
                  $sql = "select count(*) from sysobjects where type = 'U' and name = ?";
                  break;
              case 'sqlite':
                  $sql = "select count(*) from sqlite_master where type = 'table' and name = ?";
                  break;
              default:
                  throw InvalidArgumentException::forDatabaseNotSupported();
          }
  
          $stmt = $this->pdo->prepare($sql);
          $stmt->bindParam(1, $this->table);
          $stmt->execute();
  
          return $stmt->fetch(PDO::FETCH_COLUMN) > 0;
      }
docs: Determine if the migration repository exists.
  
  @return bool