public function Upsert::__toString

public Upsert::__toString()

Implements PHP magic __toString method to convert the query to a string.

The toString operation is how we compile a query object to a prepared statement.

Return value

string A prepared statement query string for this object.

Overrides Query::__toString

File

core/lib/Drupal/Core/Database/Driver/mysql/Upsert.php, line 15

Class

Upsert

MySQL implementation of \Drupal\Core\Database\Query\Upsert.

Namespace

Drupal\Core\Database\Driver\mysql

Code

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;
}