function Upsert::__toString

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

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);
    $insert_fields = array_map(function ($field) {
        return $this->connection
            ->escapeField($field);
    }, $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} = VALUES({$field})";
    }
    $query .= ' ON DUPLICATE KEY UPDATE ' . implode(', ', $update);
    return $query;
}