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本文介紹了特殊字符(Hawaiian 'Okina)導致奇怪的字符串行為的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！

問題描述

夏威夷語引用在使用 T-SQL 時有一些奇怪的行為結合字符串函數.這里發生了什么?我錯過了什么嗎?其他角色是否也有同樣的問題?

The Hawaiian quote has some weird behavior in T-SQL when using it in conjunction with string functions. What's going on here? Am I missing something? Do other characters suffer from this same problem?

SELECT UNICODE(N'?') -- Returns 699 as expected.

SELECT REPLACE(N'"?', '"', '_') -- Returns "?, I expected _?

SELECT REPLACE(N'a?', 'a', '_') -- Returns a?, I expected _?

SELECT REPLACE(N'"?', N'?', '_') -- Returns __, I expected "_

SELECT REPLACE(N'-', N'?', '_') -- Returns -, I expected -

另外，在 LIKE 中使用時很奇怪，例如:

Also, strange when used in a LIKE for example:

DECLARE @table TABLE ([Name] NVARCHAR(MAX))
INSERT INTO
    @table
VALUES
    ('John'),
    ('Jane')

SELECT
    *
FROM
    @table
WHERE
    [Name] LIKE N'%?%' -- This returns both records. I expected none.

推薦答案

夏威夷語引號在與字符串函數結合使用時在 T-SQL 中有一些奇怪的行為....其他角色是否也有同樣的問題?

The Hawaiian quote has some weird behavior in T-SQL when using it in conjunction with string functions. ... Do other characters suffer from this same problem?

一些事情:

這不是夏威夷語的引用":它是聲門停頓"影響發音.
這不是奇怪"的行為:這不是您所期望的.
這種行為并不是一個問題"，盡管是的，還有其他角色表現出類似的行為.例如，以下字符(U+02DA 環上方)的行為略有不同，具體取決于它位于字符的哪一側:

This is not a Hawaiian "quote": it's a "glottal stop" which affects pronunciation.
It is not "weird" behavior: it's just not what you were expecting.
This behavior is not specifically a "problem", though yes, there are other characters that exhibit similar behavior. For example, the following character (U+02DA Ring Above) behaves slightly differently depending on which side of a character it is on:

SELECT REPLACE(N'a?aa' COLLATE Latin1_General_100_CI_AS, N'?a',  N'_'); -- Returns a_a
SELECT REPLACE(N'a?aa' COLLATE Latin1_General_100_CI_AS, N'a?',  N'_'); -- Returns _aa

現在，任何使用 SQL Server 2008 或更新版本的人都應該使用 100(或更新)級別的排序規則.他們在 100 系列中添加了很多排序權重和大寫/小寫映射，這些映射不在 90 系列、非編號系列或大部分過時的 SQL Server 排序規則(名稱以 SQL_).

Now, anyone using SQL Server 2008 or newer should be using a 100 (or newer) level collation. They added a lot of sort weights and uppercase/lowercase mappings in the 100 series that aren't in the 90 series, or the non-numbered series, or the mostly obsolete SQL Server collations (those with names starting with SQL_).

這里的問題不是它不等同于任何其他字符(在二進制排序規則之外)，實際上它確實等同于另一個字符(U+0312 組合上方的轉逗號):

The issue here is not that it doesn't equate to any other character (outside of a binary collation), and in fact it actually does equate to one other character (U+0312 Combining Turned Comma Above):

;WITH nums AS
(
  SELECT TOP (65536) (ROW_NUMBER() OVER (ORDER BY @@MICROSOFTVERSION) - 1) AS [num]
  FROM   [master].sys.all_columns ac1
  CROSS JOIN   [master].sys.all_columns ac2
)
SELECT nums.[num] AS [INTvalue],
       CONVERT(BINARY(2), nums.[num]) AS [BINvalue],
       NCHAR(nums.[num]) AS [Character]
FROM   nums
WHERE  NCHAR(nums.[num]) = NCHAR(0x02BB) COLLATE Latin1_General_100_CI_AS;
/*
INTvalue    BINvalue    Character
699         0x02BB      ?
786         0x0312      ?
*/

問題在于這是一個間距修飾符"字符，因此它會附加到它之前或之后的字符并修改其含義/發音，具體取決于您正在處理的修飾符字符.

The issue is that this is a "spacing modifier" character, and so it attaches to, and modifies the meaning / pronunciation of, the character before or after it, depending on which modifier character you are dealing with.

根據 Unicode 標準第 7 章(歐洲-I)，第 7.8 節(修飾符)，第 323 頁(文檔的，不是 PDF 的):

According to the Unicode Standard, Chapter 7 (Europe-I), Section 7.8 (Modifier Letters), Page 323 (of the document, not of the PDF):

修飾字母，在 Unicode 標準中使用的意義上，是通常與其他字母相鄰書寫的字母或符號，并以某種方式修改它們的用法.它們不是正式的組合標記(gc = Mn 或 gc = Mc)，也沒有與它們修改的基本字母以圖形方式組合.他們本身就是基本角色.他們修改其他字母的意義更多的是他們在使用中的語義問題；它們的功能往往就像變音符號一樣，表示字母發音的變化，或以其他方式區分字母的用法.通常，這種變音符號修飾適用于修飾符字母之前的字符，但修飾符字母有時可能會修飾后面的字符.有時，修飾字母可能只是單獨代表它自己的聲音.
...

7.8 Modifier Letters

Modifier letters, in the sense used in the Unicode Standard, are letters or symbols that are typically written adjacent to other letters and which modify their usage in some way. They are not formally combining marks (gc = Mn or gc = Mc) and do not graphically combine with the base letter that they modify. They are base characters in their own right. The sense in which they modify other letters is more a matter of their semantics in usage; they often tend to function as if they were diacritics, indicating a change in pronunciation of a letter, or otherwise distinguishing a letter’s use. Typically this diacritic modification applies to the character preceding the modifier letter, but modifier letters may sometimes modify a following character. Occasionally a modifier letter may simply stand alone representing its own sound.
...

拼音用法.此塊中的大多數修飾字母都是拼音修飾符，包括覆蓋國際音標所需的字符.在許多情況下，修飾字母用于表示相鄰字母的發音在某些方面有所不同——因此得名修飾符".它們也用于標記重音或音調，或者可能只是代表他們自己的聲音.

Phonetic Usage. The majority of the modifier letters in this block are phonetic modifiers, including the characters required for coverage of the International Phonetic Alphabet. In many cases, modifier letters are used to indicate that the pronunciation of an adjacent letter is different in some way—hence the name "modifier." They are also used to mark stress or tone, or may simply represent their own sound.

下面的例子應該有助于說明.我使用的是 100 級排序規則，它需要區分重音(即名稱包含 _AS):

SELECT REPLACE(N'?'    COLLATE Latin1_General_100_CI_AS, N'?',   N'_'); -- Returns _
SELECT REPLACE(N'?a'   COLLATE Latin1_General_100_CI_AS, N'?',   N'_'); -- Returns _a
SELECT REPLACE(N'?aa'  COLLATE Latin1_General_100_CI_AS, N'?',   N'_'); -- Returns _aa
SELECT REPLACE(N'a?aa' COLLATE Latin1_General_100_CI_AS, N'?',   N'_'); -- Returns __aa

SELECT REPLACE(N'?aa'  COLLATE Latin1_General_100_CI_AS, N'?a',  N'_'); -- Returns ?__
SELECT REPLACE(N'a?aa' COLLATE Latin1_General_100_CI_AS, N'?a',  N'_'); -- Returns a?__

SELECT REPLACE(N'a?aa' COLLATE Latin1_General_100_CI_AS, N'a?',  N'_'); -- Returns _aa
SELECT REPLACE(N'a?aa' COLLATE Latin1_General_100_CI_AS, N'a?a', N'_'); -- Returns _a

SELECT REPLACE(N'a?aa' COLLATE Latin1_General_100_CI_AS, N'a',   N'_'); -- Returns a?__
SELECT REPLACE(N'??aa' COLLATE Latin1_General_100_CI_AS, N'?',   N'_'); -- Returns ??aa
SELECT REPLACE(N'??aa' COLLATE Latin1_General_100_CI_AS, N'?',   N'_'); -- Returns ??aa
SELECT REPLACE(N'?aa'  COLLATE Latin1_General_100_CI_AS, N'?',   N'_'); -- Returns _aa



SELECT CHARINDEX(N'a', N'a?a' COLLATE Latin1_General_100_CI_AS); -- 3
SELECT CHARINDEX(N'a', N'a?a' COLLATE Latin1_General_100_CI_AI); -- 1



SELECT 1 WHERE N'a' = N'a?' COLLATE Latin1_General_100_CI_AS; -- (0 rows returned)
SELECT 2 WHERE N'a' = N'a?' COLLATE Latin1_General_100_CI_AI; -- 2

如果您需要以忽略其預期語言行為的方式處理此類字符，那么是的，您必須使用二進制排序規則.在這種情況下，請使用最新的排序規則和 BIN2 而不是 BIN(假設您使用的是 SQL Server 2005 或更新版本).含義:

If you need to deal with such characters in a way that ignores their intended linguistic behavior, then yes, you must use a binary collation. In such cases, please use the most recent level of collation, and BIN2 instead of BIN (assuming you are using SQL Server 2005 or newer). Meaning:

SQL Server 2000:Latin1_General_BIN
SQL Server 2005:Latin1_General_BIN2
SQL Server 2008、2008 R2、2012、2014 和 2016:Latin1_General_100_BIN2
SQL Server 2017 及更新版本:Japanese_XJIS_140_BIN2

如果您想知道我為什么提出這個建議，請參閱:

If you are curious why I make that recommendation, please see:

各種二進制排序規則之間的差異(文化、版本和 BIN 與 BIN2)

此外，有關排序規則/Unicode/編碼等的更多信息，請訪問:排序規則信息

And, for more information on collations / Unicode / encodings / etc, please visit: Collations Info

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特殊字符(Hawaiian 'Okina)導致奇怪的字符串行為

問題描述

推薦答案

7.8 Modifier Letters

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