postgres中全文搜索的问题

Question

我有下一个table和数据：

/* script for people table, with field tsvector and gin */

CREATE TABLE public.people (
  id INTEGER,
  name VARCHAR(30),
  lastname VARCHAR(30),
  complete TSVECTOR
) 
WITH (oids = false);

CREATE INDEX idx_complete ON public.people
  USING gin (complete);

/* data for people table */

INSERT INTO public.people ("id", "name", "lastname", "complete")
VALUES 
  (1, 'MICHAEL', 'BRYANT BRYANT', '''bryant'':2,3 ''michael'':1'),
  (2, 'HENRY STEVEN', 'BUSH TIESSEN', '''bush'':3 ''henri'':1 ''steven'':2 ''tiessen'':4'),
  (3, 'WILLINGTON STEVEN', 'STEPHENS FLINN', '''flinn'':4 ''stephen'':3 ''steven'':2 ''willington'':1'),
  (4, 'BRET', 'MARTINEZ AROCH', '''aroch'':3 ''bret'':1 ''martinez'':2'),
  (5, 'TERENCE BERT', 'CAVALIERE ENRON', '''bert'':2 ''cavalier'':3 ''terenc'':1');

我需要根据 tsvector 字段检索名字和姓氏。其实我有疑问：

SELECT * FROM people WHERE complete @@ to_tsquery('WILLINGTON & FLINN');

并且结果正确（第三条记录）。但是如果我尝试

SELECT * FROM people WHERE complete @@ to_tsquery('STEVEN & FLINN');
/* the same record! */

我没有结果。为什么？我能做什么？

Answer 1

您应该使用与插入字段 'complete' 中的值相同的语言来搜索 table。

检查比较英语和德语的查询结果：

select * ,
to_tsvector('english', concat_ws(' ', name, lastname )) as english,
to_tsvector('german', concat_ws(' ', name, lastname )) as german
from public.people

所以这对你有用:

SELECT * FROM people WHERE complete @@ to_tsquery('english','STEVEN & FLINN');

Answer 2

您可能正在使用文本搜索配置，其中 STEVEN 或 FLINN 被词干提取修改。

我可以在这里重现：

test=> SHOW default_text_search_config;
 default_text_search_config 
----------------------------
 pg_catalog.german
(1 row)

test=> SELECT complete FROM public.people WHERE id = 3;
                    complete                     
-------------------------------------------------
 'flinn':4 'stephen':3 'steven':2 'willington':1
(1 row)

test=> SELECT * FROM ts_debug('STEVEN & FLINN');
   alias   |   description   | token  | dictionaries  | dictionary  | lexemes 
-----------+-----------------+--------+---------------+-------------+---------
 asciiword | Word, all ASCII | STEVEN | {german_stem} | german_stem | {stev}
 blank     | Space symbols   |        | {}            |             | 
 blank     | Space symbols   | &      | {}            |             | 
 asciiword | Word, all ASCII | FLINN  | {german_stem} | german_stem | {flinn}
(4 rows)

test=> SELECT * FROM public.people
       WHERE complete @@ to_tsquery('STEVEN & FLINN');
 id | name | lastname | complete 
----+------+----------+----------
(0 rows)

所以你看，德语 Snowball 词典词干 STEVEN 到 stev。

由于 complete 包含未提取词干的版本 steven，未找到匹配项。

填充 complete 和查询时应使用相同的文本搜索配置。

postgres中全文搜索的问题

problems with full-text search in postgres

postgresql

full-text-search