sql - 返回在全文搜索中找到的短语的周围文本，SQL 2005

Question

我正在使用包含谓词在 SQL Server 索引文本字段中查找短语。有没有办法返回包含搜索短语的文本字段部分或其周围的某些区域？

例如，如果我在葛底斯堡演说(摘录如下)中搜索“人人生而平等”，我想返回“致力于人人生而平等的命题”，例如它周围有一些文字。

Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that *all men are created equal.*

Now we are engaged in a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure. We are met on a great battle-field of that war. We have come to dedicate a portion of that field, as a final resting place for those who here gave their lives that that nation might live. It is altogether fitting and proper that we should do this. 

Answer 1

好吧，我不熟悉 SQL Server 语法，但您可以在字段中找到匹配项并返回它的子字符串。 伪代码:

SELECT
  SUBSTRING(field, MAX(0, STRPOS(field, 'all men are equal' - 20), STRLEN('all men are equal') + 40)
FROM
  yourtable
WHERE
  field CONTAINS 'all men are equal'

有了这个，您只能找到包含该短语的那些记录的子字符串的位置，并返回一个长 40 个字符的字符串，所以类似的东西应该可以工作。