How do we match values with backslashes in a MySQL column, such as 'a\\b'?-Mysql Tutorial-php.cn

How do we match values with backslashes in a MySQL column, such as 'a\\b'?

王林

Release： 2023-08-29 19:21:08

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$我们如何匹配 MySQL 列中带有反斜杠的值，例如“a\\\\b”？$

通过使用RLIKE运算符，我们可以进行这种类型的匹配。唯一的概念是在MySQL查询中使用一些反斜杠。下面的示例将更清楚地说明：

我们有以下表格，其中包含值为'a\b'和'a\b'。

mysql> select * from backslashes;
+------+-------+
| Id   | Value |
+------+-------+
|    1 | 200   |
|    2 | 300   |
|    4 | a\b  |
|    3 | a\b   |
+------+-------+
4 rows in set (0.10 sec)

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现在假设我们想匹配值 ‘a\b’，那么我们需要写入八个反斜杠。这是因为第二个反斜杠没有被第一个反斜杠转义，所以为了比较两个字面量，我们需要将反斜杠加倍，但由于我们从MySQL字符串查询表中查询这样的字符串，所以这个加倍会发生两次 - 一次在客户端，一次在数据库中。因此，我们需要使用四个反斜杠，如下面的查询所示 −

mysql> Select * from backslashes where value RLIKE &#39;a\\\\b&#39;;
+------+-------+
| Id   | Value |
+------+-------+
|    4 | a\b  |
+------+-------+
1 row in set (0.00 sec)

mysql> Select * from backslashes where value RLIKE &#39;a\\b&#39;;
+------+-------+
| Id   | Value |
+------+-------+
|    3 | a\b   |
+------+-------+
1 row in set (0.01 sec)

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