March 2017
Intermediate to advanced
364 pages
9h 45m
Japanese
Content preview from 初めてのPHP
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160
8
章 情報の保存：データベース
例
8-23
テーブルのすべての行の削除
DELETE FROM dishes
WHERE
句があれば、
DELETE
は
WHERE
句に一致する行を削除します。例 8-24には、
WHERE
句が
ある 2 つの
DELETE
クエリを示します。
例
8-24
テーブルからの一部の行の削除
; price
が
10.00
より大きい行を削除する
DELETE FROM dishes WHERE price > 10.00
; dish_name
が「
Walnut Bun
」と完全に一致する行を削除する
DELETE FROM dishes WHERE dish_name = 'Walnut Bun'
SQL には
UNDELETE
コマンドはないので、
DELETE
の使用には注意が必要です。
8.5
フォームデータの安全な挿入
「7.4.6HTMLと JavaScript」で説明したように、無害化せずにフォームデータを出力すると、自
分自身やユーザがク
ロスサイトスクリプティング攻撃にさらされる危険があります。また、SQL
クエリで無害化していないフォームデータを使うと、「SQLインジェクション攻撃」と呼ばれる同
様の問題の原因になります。ユーザが新しい料理を提案できるフォームを考えてみましょう。この
フォームには、ユーザが新しい料理名を入力できる
new_dish_name
というテキスト要素が含まれま
す。例8-25 の
exec()
の呼び出しは、新しい料理を
dishes
テーブルに挿入しますが、SQL
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.