说明
用于在生成的SQL语句中添加注释内容
示例
Db::table('think_score')->comment('查询考试前十名分数') ->field('username,score') ->limit(10) ->order('score desc') ->select();
对应原始SQL
SELECT username,score FROM think_score ORDER BY score desc LIMIT 10 /* 查询考试前十名分数 */