Upsert::__toString

public Upsert::__toString()

public function __toString() {
  // Create a sanitized comment string to prepend to the query.
  $comments = $this->connection->makeComment($this->comments);

  // Default fields are always placed first for consistency.
  $insert_fields = array_merge($this->defaultFields, $this->insertFields);

  $query = $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $insert_fields) . ') VALUES ';

  $values = $this->getInsertPlaceholderFragment($this->insertValues, $this->defaultFields);
  $query .= implode(', ', $values);

  // Updating the unique / primary key is not necessary.
  unset($insert_fields[$this->key]);

  $update = [];
  foreach ($insert_fields as $field) {
    $update[] = "$field = VALUES($field)";
  }

  $query .= ' ON DUPLICATE KEY UPDATE ' . implode(', ', $update);

  return $query;
}