本文介绍了Postgresql ILIKE与TSEARCH的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
SELECT * FROM some-table
WHERE field1 ILIKE％thing％
OR field2 ILIKE％thing
OR field3 ILIKE％thing;
列几乎都是varchar（50）或其附近。现在我明白为了提高性能，我应该为搜索所在的领域编制索引。我应该考虑用TSEARCH完全取代ILIKE吗？
解决方案全文搜索设置与包含 。它阻止了单词等，所以你可以匹配汽车与汽车。如果你真的想要一个快速ILIKE，那么没有标准数据库索引或FTS会有帮助。幸运的是，pg_trgm模块可以做到这一点。
I have a query with a number of test fields something like this:
SELECT * FROM some-table
WHERE field1 ILIKE "%thing%"
OR field2 ILIKE "%thing"
OR field3 ILIKE "%thing";
The columns are pretty much all varchar(50) or thereabouts. Now I understand to improve performance I should index the fields upon which the search operates. Should I be considering replacing ILIKE with TSEARCH completely?
解决方案
A full text search setup is not identical to a "contains" like query. It stems words etc so you can match "cars" against "car".
If you really want a fast ILIKE then no standard database index or FTS will help. Fortunately, the pg_trgm module can do that.
- http://www.postgresql.org/docs/9.1/static/pgtrgm.html
- http://www.depesz.com/2011/02/19/waiting-for-9-1-faster-likeilike/
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