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最新推荐文章于 2024-12-09 14:12:53 发布

最新推荐文章于 2024-12-09 14:12:53 发布 · 138 阅读

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本文介绍了一个名为TokyoDystopia的数据库模块的使用方法，重点在于其提供的复合表达式搜索功能。该功能允许用户通过多种组合方式精确查找记录，例如使用逻辑运算符进行复杂查询。

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>>> from tokyodystopia import TokyoDystopia
>>> db = TokyoDystopia("/tmp/test.db", 255)
>>> db.put(0, u"仙台".encode("utf8"), " ")
1
>>> db.put(1, u"仙台広島".encode("utf8"), " ")
1
>>> db.put(2, u"広島山形湘南山形".encode("utf8"), " ")
1
>>> db.search(u"仙台".encode("utf-8"))
2
[0L, 1L]
>>> db.search(u"広島".encode("utf-8"))
2
[1L, 2L]
>> db.close()

The function `tcidbsearch2' searches with a compound expression. In the compound expression, tokens are separated by one or more white space characters. If one token is specified, records including the specified pattern are searched for. Upper or lower case is not distinguished. Accent marks and diacritical marks are ignored. If two or more tokens are specified, records including all of the patterns are searched for. The compound expression includes the following sub expressions.

* A B : searches for records including the two tokens.
* A && B : searches for records including the two tokens.
* A || B : searches for records including the one or both of the two tokens.
* "A B..." : searches for records including the phrase.
* ［A］ : searches for records including words exactly matching the token.
* ［A*］ : searches for records including words beginning with the token.
* ［*A］ : searches for records including words ending with the token.
* ［［A : searches for records beginning with the token.
* A］］ : searches for records ending with the token.

Note that the priority of "||" is higher than the one of "&&".