src/Db/Literal.php
public function getValue($driver = 'default') {
        $driver = $this->normalizeKey($driver);

        if (isset($this->driverValues[$driver])) {
            return $this->driverValues[$driver];
        } elseif (isset($this->driverValues['default'])) {
            return $this->driverValues['default'];
        } else {
            return 'null';
        }
    }
public function getValue($driver = 'default') {
        $driver = $this->normalizeKey($driver);

        if (isset($this->driverValues[$driver])) {
            return $this->driverValues[$driver];
        } elseif (isset($this->driverValues['default'])) {
            return $this->driverValues['default'];
        } else {
            return 'null';
        }
    }
Get the literal value.

@param string $driver The name of the database driver to fetch the literal for.
@return string Returns the value for the specific driver, the default literal, or "null" if there is no default.