original_string: public function fetchOne(string $sql, array $values = [], int $columnNumber = 0): string
      {
          return $this->dbConnection->prepare($sql)
                  ->execute($values)
                  ->fetchOne($columnNumber);
      }
code: public function fetchOne(string $sql, array $values = [], int $columnNumber = 0): string
      {
          return $this->dbConnection->prepare($sql)
                  ->execute($values)
                  ->fetchOne($columnNumber);
      }
code_tokens: public function fetchOne ( string $ sql , array $ values = [ ] , int $ columnNumber = 0 ) : string { return $ this -> dbConnection -> prepare ( $ sql ) -> execute ( $ values ) -> fetchOne ( $ columnNumber ) ; }
docstring: fetch single value from a result set
  
  @param   string  $sql            sql query to fetch data with
  @param   array   $values         map of values in case $sql contains a prepared statement
  @param   int     $columnNumber  optional  the column number to fetch, default is first column
  @return  string
  @throws  \stubbles\db\DatabaseException
  @since   3.1.0
docstring_tokens: fetch single value from a result set