text search类型的相关函数和运算
Operator |
Return Type |
Description |
Example |
Result |
@@ |
boolean |
tsvector 是否匹配 tsquery |
to_tsvector('fat cats ate rats') @@ to_tsquery('cat & rat') |
t |
@@@ |
boolean |
tsvector 是否匹配 tsquery |
to_tsvector('fat cats ate rats') @@@ to_tsquery('cat & rat') |
t |
|| |
tsvector |
连接 tsvectors |
'a:1 b:2'::tsvector || 'c:1 d:2 b:3'::tsvector |
'a':1 'b':2,5 'c':3 'd':4 |
&& |
tsquery |
将两个tsquery用AND连接在一起 |
'fat | rat'::tsquery && 'cat'::tsquery |
( 'fat' | 'rat' ) & 'cat' |
|| |
tsquery |
将两个tsquery用OR连接在一起 |
'fat | rat'::tsquery || 'cat'::tsquery |
( 'fat' | 'rat' ) | 'cat' |
!! |
tsquery |
对一个 tsquery取非 |
!! 'cat'::tsquery |
!'cat' |
<-> |
tsquery |
tsquery followed by tsquery |
to_tsquery('fat') <-> to_tsquery('rat') |
'fat' <-> 'rat' |
@> |
boolean |
一个tsquery是否包含另一个 |
'cat'::tsquery @> 'cat & rat'::tsquery |
f |
<@ |
boolean |
一个tsquery是否包含另一个 |
'cat'::tsquery <@ 'cat & rat'::tsquery |
t |
Function |
Return Type |
Description |
Example |
Result |
array_to_tsvector(text[]) |
tsvector |
将数组转换为tsvector |
array_to_tsvector('{fat,cat,rat}'::text[]) |
'cat' 'fat' 'rat' |
get_current_ts_config() |
regconfig |
获取默认的text search配置 |
get_current_ts_config() |
english |
length(tsvector) |
integer |
获取tsvector之后的数量 |
length('fat:2,4 cat:3 rat:5A'::tsvector) |
3 |
numnode(tsquery) |
integer |
词位+运算符号的数量 |
numnode('(fat & rat) | cat'::tsquery) |
5 |
plainto_tsquery([ configregconfig , ] query text) |
tsquery |
根据英语,生成tsquery,去掉标点及辅助词(a the than then等)并且去掉复数 |
plainto_tsquery('english', 'The Fat Rats') |
'fat' & 'rat' |
phraseto_tsquery([ configregconfig , ] query text) |
tsquery |
根据英语,生成tsquery,去掉标点及辅助词(a the than then等)并且去掉复数 |
phraseto_tsquery('english', 'The Fat Rats') |
'fat' <-> 'rat' |
querytree(query tsquery) |
text |
得到可加索引的部分 |
querytree('foo & ! bar'::tsquery) |
'foo' |
setweight(vector tsvector,weight "char") |
tsvector |
对向量的每个元素赋权 |
setweight('fat:2,4 cat:3 rat:5B'::tsvector, 'A') |
'cat':3A 'fat':2A,4A 'rat':5A |
setweight(vector tsvector,weight "char", lexemes text[]) |
tsvector |
将权重分配给列在列表中的向量元素 |
setweight('fat:2,4 cat:3 rat:5B'::tsvector, 'A', '{cat,rat}') |
'cat':3A 'fat':2,4 'rat':5A |
strip(tsvector) |
tsvector |
删除位置和比重 |
strip('fat:2,4 cat:3 rat:5A'::tsvector) |
'cat' 'fat' 'rat' |
to_tsquery([ config regconfig ,] query text) |
tsquery |
普通的词转换为tsquery |
to_tsquery('english', 'The & Fat & Rats') |
'fat' & 'rat' |
to_tsvector([ config regconfig ,] document text) |
tsvector |
将文档文本还原为tsvector |
to_tsvector('english', 'The Fat Rats') |
'fat':2 'rat':3 |
to_tsvector([ config regconfig ,] document json(b)) |
tsvector |
将文档中的每个字符串值还原为tsvector, 然后在文档顺序中连接这些字符串以生成单个tsvector |
to_tsvector('english', '{"a": "The Fat Rats"}'::json) |
'fat':2 'rat':3 |
ts_delete(vector tsvector,lexeme text) |
tsvector |
从tsvector中删除给定的词位 |
ts_delete('fat:2,4 cat:3 rat:5A'::tsvector, 'fat') |
'cat':3 'rat':5A |
ts_delete(vector tsvector,lexemes text[]) |
tsvector |
从tsvector中删除任意词条的出现 |
ts_delete('fat:2,4 cat:3 rat:5A'::tsvector, ARRAY['fat','rat']) |
'cat':3 |
ts_filter(vector tsvector,weights "char"[]) |
tsvector |
仅从向量中选择具有矢量的元素 |
ts_filter('fat:2,4 cat:3b rat:5A'::tsvector, '{a,b}') |
'cat':3B 'rat':5A |
ts_headline([ config regconfig,] document text, query tsquery[, options text ]) |
text |
选择元素,对元素加粗 |
ts_headline('x y z', 'z'::tsquery) |
x y <b>z</b> |
ts_headline([ config regconfig,] document json(b), querytsquery [, options text ]) |
text |
选择元素,对元素加粗 |
ts_headline('{"a":"x y z"}'::json, 'z'::tsquery) |
{"a":"x y <b>z</b>"} |
ts_rank([ weights float4[], ]vector tsvector, query tsquery[, normalization integer ]) |
float4 |
查询排序文件 |
ts_rank(textsearch, query) |
0.818 |
ts_rank_cd([ weights float4[], ]vector tsvector, query tsquery[, normalization integer ]) |
float4 |
使用覆盖密度查询的秩文档 |
ts_rank_cd('{0.1, 0.2, 0.4, 1.0}', textsearch, query) |
2.01317 |
ts_rewrite(query tsquery, targettsquery, substitute tsquery) |
tsquery |
在查询中替换目标 |
ts_rewrite('a & b'::tsquery, 'a'::tsquery, 'foo|bar'::tsquery) |
'b' & ( 'foo' | 'bar' ) |
ts_rewrite(query tsquery, selecttext) |
tsquery |
使用select查询命令替换目标和替代物 |
SELECT ts_rewrite('a & b'::tsquery, 'SELECT t,s FROM aliases') |
'b' & ( 'foo' | 'bar' ) |
tsquery_phrase(query1 tsquery,query2 tsquery) |
tsquery |
使查询query1跟随query2 (same as <->operator) |
tsquery_phrase(to_tsquery('fat'), to_tsquery('cat')) |
'fat' <-> 'cat' |
tsquery_phrase(query1 tsquery,query2 tsquery, distanceinteger) |
tsquery |
ts_query1 到ts_query2之间的距离 |
tsquery_phrase(to_tsquery('fat'), to_tsquery('cat'), 10) |
'fat' <10> 'cat' |
tsvector_to_array(tsvector) |
text[] |
将tsvector转换为词位的数组 |
tsvector_to_array('fat:2,4 cat:3 rat:5A'::tsvector) |
{cat,fat,rat} |
tsvector_update_trigger() |
trigger |
自动tsvector列更新的trigger |
CREATE TRIGGER ... tsvector_update_trigger(tsvcol, 'pg_catalog.swedish', title, body) |
|
tsvector_update_trigger_column() |
trigger |
自动tsvector列更新的trigger |
CREATE TRIGGER ... tsvector_update_trigger_column(tsvcol, configcol, title, body) |
|
unnest(tsvector, OUT lexemetext, OUT positions smallint[], OUT weights text) |
setof record |
将tsvectorz元素展开为一行行的内容 |
unnest('fat:2,4 cat:3 rat:5A'::tsvector) |
(cat,{3},{D}) ... |
Function |
Return Type |
Description |
Example |
Result |
ts_debug([ config regconfig, ] documenttext, OUT alias text, OUT descriptiontext, OUT token text, OUT dictionariesregdictionary[], OUT dictionaryregdictionary, OUT lexemes text[]) |
setof record |
测试配置 |
ts_debug('english', 'The Brightest supernovaes') |
(asciiword,"Word, all ASCII",The,{english_stem},english_stem,{}) ... |
ts_lexize(dict regdictionary, tokentext) |
text[] |
测试字典类型 |
ts_lexize('english_stem', 'stars') |
{star} |
ts_parse(parser_name text, documenttext, OUT tokid integer, OUT tokentext) |
setof record |
测试解析 |
ts_parse('default', 'foo - bar') |
(1,foo) ... |
ts_parse(parser_oid oid, document text, OUT tokid integer, OUT token text) |
setof record |
测试解析 |
ts_parse(3722, 'foo - bar') |
(1,foo) ... |
ts_token_type(parser_name text, OUTtokid integer, OUT alias text, OUTdescription text) |
setof record |
获取解析器定义的token类型 |
ts_token_type('default') |
(1,asciiword,"Word, all ASCII") ... |
ts_token_type(parser_oid oid, OUT tokidinteger, OUT alias text, OUTdescription text) |
setof record |
获取解析器定义的token类型 |
ts_token_type(3722) |
(1,asciiword,"Word, all ASCII") ... |
ts_stat(sqlquery text, [ weights text,] OUT word text, OUT ndoc integer, OUTnentry integer) |
setof record |
获取tsvector列的统计信息 |
ts_stat('SELECT vector from apod') |
(foo,10,15) ... |