solr :term 查询, phrase查询, boolean 查询
搜索总体有:term 查询, phrase查询, boolean 查询
1. SOLR搜索覆盖度和准确度保证的三个搜索方式:
保证准确率: AND: Search for two different terms, new and house, requiring both to match 。完全相同逻辑的两种写法:(+new +house new AND house )
保证覆盖率:OR : Search for two different terms, new and house, requiring only one to match 。solr默认的是OR搜索,所以(new or house, new house)结果一样
保证精准度: "": Search for the exact phrase "new house" ,查询full phrase,则solr会考虑在 new AND house的结果集基础上,考虑new 和house之间的position。
保证覆盖率:Fuzzy matching 模糊搜索(包含:wildcard searching通配符搜索, range searching范围搜索, edit-distance searching编辑距离搜索, and proximity searching邻近搜索. )
其中,
(1)范围搜索例子如下:• Query: yearsOld:[18 TO 21] Matches 18, 19, 20, 21 ;• Query: title:[boat TO boulder] Matches boat, boil, book, boulder, etc. ;• Query: price:[12.99 TO 14.99] Matches 12.99, 13.000009, 14.99, etc. ,范围用{}或[]或者[}或者{],同集合区间表示一样。
(2)编辑距离搜索中:编辑距离定义是An edit distance is defined as an insertion插入, a deletion删除, a substitution置换替换, ora transposition互换 of characters.
例子如下:Query: administrator~1 Matches within one edit distance. • Query: administrator~2 Matches within two edit distances. (T his is the default if no edit distance is provided.) • Query: administrator~N Matches within N edit distances
(3)邻近搜索指的是搜索两个term之间的term:Query: "chief of ficer"~1 ,当你只记得短语的第一个和最后一个词的时候可以采用邻近搜索。邻近搜索的例子:Query: "chief of ficer"~N --- Meaning: Finds chief within N positions of off icer.
2. SOLR提供的排除搜索:
NOT或者 -,都表示否定;如 中国 NOT 北京====中国 - 北京
3. SOLR支持野蛮查询:增加了搜索的灵活性
New AND (house OR (home NOT improvement NOT depot NOT grown))
(+(buying purchasing -renting) +(home house residence –(+property -bedroom)))
不论用什么逻辑来搜索,solr都是先搜索每个term的结果集,然后进行逻辑操作返回真实结果
备注:为了和+ 等符号区分,solr中将AND , OR描述为 binary operator
总体来说:越复杂的搜索越影响效率,所以采用哪种搜索以及设置的参数都需要经过分析,否则保证了业务搜索的效果而影响了性能。