SQLBuilder\Universal\Syntax\AlterTableChangeColumn::toSql PHP Метод

    public function toSql(BaseDriver $driver, ArgumentArray $args)
    {
        $sql = 'CHANGE COLUMN ';
        if (is_string($this->fromColumn)) {
            $sql .= $driver->quoteIdentifier($this->fromColumn);
        } else {
            if ($this->fromColumn instanceof Column) {
                $sql .= $driver->quoteIdentifier($this->fromColumn->getName());
            }
        }
        // the 'toColumn' must be a type of Column, we need at least column type to rename.
        $sql .= ' ' . $this->toColumn->buildDefinitionSqlForModify($driver, $args);
        if ($driver instanceof MySQLDriver) {
            if ($this->after) {
                $sql .= ' AFTER ' . $driver->quoteIdentifier($this->after);
            } else {
                if ($this->first) {
                    $sql .= ' FIRST';
                }
            }
        }
        return $sql;
    }