Also another thing to be careful of is whether or not it is really stored as a classic ASCII ' (ASCII 27) or Unicode 2019 (which looks similar, but not the same). This isn't a big deal on inserts, but it can mean the world on selects and updates. If it's the unicode value then escaping the ' in a WHERE clause (e.g where blah = 'Workers''s Comp') will return like the value you are searching for isn't there if the ' in "Worker's Comp" is actually the unicode value.If your client application supports free-key, as well as copy and paste based input, it could be Unicode in some rows, and ASCII in others! A simple way to confirm this is by doing some kind of open ended query that will bring back the value you are searching for, and then copy and paste that into notepad++ or some other unicode supporting editor. The differing appearance between the ascii value and the unicode one should be obvious to the eyes, but if you lean towards the anal, it will show up as 27 (ascii) or 92 (unicode) in a hex editor.

有两种方法可以解决这个问题:

对于'，你可以简单地在字符串中加倍它，例如。 选择'I' m happy '——将得到:I'm happy

对于任何你不确定的字符:在sql server中，你可以通过选择unicode(':')来获得任何字符的unicode(你保留这个数字)

在这种情况下你还可以选择I +nchar(39)+ m happy

STRING_ESCAPE函数可以在新版本的SQL Server上使用

通过将单引号加倍来转义，就像您在示例中展示的那样。下面的SQL说明了这个功能。我在SQL Server 2008上进行了测试:

DECLARE @my_table TABLE (
    [value] VARCHAR(200)
)

INSERT INTO @my_table VALUES ('hi, my name''s tim.')

SELECT * FROM @my_table

结果

value
==================
hi, my name's tim.

我们中的许多人都知道，转义单引号的流行方法是像下面这样轻松地将它们重复。

PRINT 'It''s me, Arul.';

我们将研究其他一些转义单引号的替代方法。

1. UNICODE字符

39是单引号的UNICODE字符。我们可以像下面这样使用它。

PRINT 'Hi,it'+CHAR(39)+'s Arul.';
PRINT 'Helo,it'+NCHAR(39)+'s Arul.';

2. QUOTED_IDENTIFIER

另一个简单且最佳的替代解决方案是使用QUOTED_IDENTIFIER。 当QUOTED_IDENTIFIER设置为OFF时，字符串可以用双引号括起来。 在这个场景中，我们不需要转义单引号。 所以，这种方法在使用很多带单引号的字符串值时非常有用。 当使用这么多行INSERT/UPDATE脚本(其中列值有单引号)时，这将非常有帮助。

SET QUOTED_IDENTIFIER OFF;
PRINT "It's Arul."
SET QUOTED_IDENTIFIER ON;

结论

上述方法适用于AZURE和On Premises。

下面的语法将只转义一个引号:

SELECT ''''

结果将是一个单引号。对于创建动态SQL:)可能非常有帮助。