問題描述
MySQL 文檔說它應該是 \'.但是，scite 和 mysql 都顯示 '' 有效.我看到了，它的工作原理.我該怎么辦?
您引用的 MySQL 文檔實際上比您提到的要多一些.它還說，
<塊引用>在用'"引用的字符串中的'"可以寫成''".
(另外，您鏈接到 MySQL 5.0 版本的表 8.1.特殊字符轉(zhuǎn)義序列，當前版本是 5.6 — 但當前的 表 8.1.特殊字符轉(zhuǎn)義序列看起來非常相似.)
我認為 Postgres 注釋backslash_quote (string) 參數(shù) 提供信息:
這控制引號是否可以在字符串文字中用 \' 表示.表示引號的首選 SQL 標準方式是將引號加倍 ('')，但 PostgreSQL 歷來也接受 \'.但是，使用 \' 會帶來安全風險...
這對我說，與使用反斜杠轉(zhuǎn)義單引號相比，使用雙引號字符是更好的整體和長期選擇.
現(xiàn)在，如果您還想在等式中添加語言選擇、??SQL 數(shù)據(jù)庫及其非標準特性的選擇以及查詢框架的選擇，那么您最終可能會有不同的選擇.你沒有提供太多關(guān)于你的約束的信息.
The MySQL documentation says that it should be \'. However, both scite and mysql shows that '' works. I saw that and it works. What should I do?
The MySQL documentation you cite actually says a little bit more than you mention. It also says,
A "
'" inside a string quoted with "'" may be written as "''".
(Also, you linked to the MySQL 5.0 version of Table 8.1. Special Character Escape Sequences, and the current version is 5.6 — but the current Table 8.1. Special Character Escape Sequences looks pretty similar.)
I think the Postgres note on the backslash_quote (string) parameter is informative:
This controls whether a quote mark can be represented by
\'in a string literal. The preferred, SQL-standard way to represent a quote mark is by doubling it ('') but PostgreSQL has historically also accepted\'. However, use of\'creates security risks...
That says to me that using a doubled single-quote character is a better overall and long-term choice than using a backslash to escape the single-quote.
Now if you also want to add choice of language, choice of SQL database and its non-standard quirks, and choice of query framework to the equation, then you might end up with a different choice. You don't give much information about your constraints.
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