SQL Server全文搜索转义字符？ [英] SQL Server Full Text Search Escape Characters?

问题描述

我正在做一个MS SQL Server全文搜索查询。我需要转义特殊字符，以便搜索包含特殊字符的特定字词。是否有一个内置函数来转义全文搜索字符串？如果不是，你会怎么做？ 解决方案

坏消息：没有办法。好消息：你不需要它（因为它无论如何也无济于事）。

我在其中一个项目中遇到了类似的问题。我的理解是，在构建全文索引时，SQL Server会将所有特殊字符视为单词分隔符，因此：

1. 字符在全文索引中表示为两个（或多个）字词。


2. 这些字符被删除并且不会出现在索引中。

考虑我们下面的表格以及相应的全文索引（它被跳过）：

  CREATE TABLE [dbo]。[ActicleTable] 
（
 [Id] int identity（1,1）not null primary key，
 [ ActicleBody] varchar（max）not null 
）; 
  

稍后我们将表添加到行：

  INSERT INTO [ActicleTable] values（'digitally improvements folders'）
 INSERT INTO [ActicleTable] values（'digitally improve {ments} fold（ers）'） 
  

尝试搜索：

  SELECT * FROM [ArticleTable] WHERE CONTAINS（*，'digitally'）
 SELECT * FROM [ArticleTable] WHERE CONTAINS（*，'improvements'）
 SELECT * FROM [ArticleTable] WHERE CONTAINS（*，'folders'）
  

和

  SELECT * FROM [ArticleTable] WHERE CONTAINS（*，'digital'）
 SELECT * FROM [ArticleTable] WHERE CONTAINS（*，'improve'）
 SELECT * FROM [ArticleTable] WHERE CONTAINS（*，'fold'）
  

第一组条件匹配第一行（而不是第二行），而第二组匹配第二行。

不幸的是我找不到al墨迹到MSDN（或其他地方），这些行为是明确陈述的。但是我找到了官方文章，它告诉如何将引号全文搜索查询，这与上述算法[隐含地]一致。

I am doing a MS SQL Server Full Text Search query. I need to escape special characters so I can search on a specific term that contains special characters. Is there a built-in function to escape a full text search string ? If not, how would you do it ?

解决方案

Bad news: there's no way. Good news: you don't need it (as it won't help anyway).

I've faced similar issue on one of my projects. My understanding is that while building full-text index, SQL Server treats all special characters as word delimiters and hence:

1. Your word with such a character is represented as two (or more) words in full-text index.
2. These character(s) are stripped away and don't appear in an index.

Consider we have the following table with a corresponding full-text index for it (which is skipped):

CREATE TABLE [dbo].[ActicleTable] 
(
  [Id] int identity(1,1) not null primary key,
  [ActicleBody] varchar(max) not null
);

Consider later we add rows to the table:

INSERT INTO [ActicleTable] values ('digitally improvements folders')
INSERT INTO [ActicleTable] values ('digital"ly improve{ments} fold(ers)')

Try searching:

SELECT * FROM [ArticleTable] WHERE CONTAINS(*, 'digitally')
SELECT * FROM [ArticleTable] WHERE CONTAINS(*, 'improvements')
SELECT * FROM [ArticleTable] WHERE CONTAINS(*, 'folders')

and

SELECT * FROM [ArticleTable] WHERE CONTAINS(*, 'digital')
SELECT * FROM [ArticleTable] WHERE CONTAINS(*, 'improve')
SELECT * FROM [ArticleTable] WHERE CONTAINS(*, 'fold')

First group of conditions will match first row (and not the second) while the second group will match second row only.

Unfortunately I could not find a link to MSDN (or something) where such behaviour is clearly stated. But I've found an official article that tells how to convert quotation marks for full-text search queries, which is [implicitly] aligned with the above described algorithm.

这篇关于SQL Server全文搜索转义字符？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！