Mysql 查询不返回带有转义\的数据

Question

我正在尝试查询我们的 MSSQL 数据库，但当那里明显有数据时我却没有得到任何数据。

首先我查询

SELECT id, instruction_link FROM work_instructions WHERE instruction_link LIKE "%\\\\cots-sbs%";

返回 100 多行。 http://tinypic.com/r/ief8td/8 (抱歉，无法发布实际图片，没有足够的代表:(

但是如果我查询

SELECT id, instruction_link FROM work_instructions WHERE instruction_link LIKE "%\\\\cots-sbs\\%";

http://tinypic.com/r/33ksw3q/8

第二个查询没有得到任何结果。我不知道我在这里做错了什么。看起来很简单，但我无法理解它..

提前致谢。

Answer 1

如 LIKE 下所述:

Note

Because MySQL uses C escape syntax in strings (for example, “\n” to represent a newline character), you must double any “\” that you use in LIKE strings. For example, to search for “\n”, specify it as “\\n”. To search for “\”, specify it as “\\\\”; this is because the backslashes are stripped once by the parser and again when the pattern match is made, leaving a single backslash to be matched against.

\\% 被解析为包含文字反斜杠后跟百分号字符的字符串，然后将其解释为包含以下内容的模式只是一个字面上的百分号。