public function NativeUpsert::__toString in Drupal 8

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/pgsql/NativeUpsert.php, line 97

Class

NativeUpsert

PostgreSQL implementation of native \Drupal\Core\Database\Query\Upsert.

Namespace

Drupal\Core\Database\Driver\pgsql

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);
  $insert_fields = array_map(function ($f) {
    return $this->connection
      ->escapeField($f);
  }, $insert_fields);
  $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} = EXCLUDED.{$field}";
  }
  $query .= ' ON CONFLICT (' . $this->connection
    ->escapeField($this->key) . ') DO UPDATE SET ' . implode(', ', $update);
  return $query;
}