sql - 对 hstore 标签的 PostGis 搜索查询

Question

我正在编写一个搜索客户端，以查询 postgis db。

搜索查询将是，

    SELECT tags->'name' AS name,ST_Transform(way,4326) AS pt_lonlattext 
FROM planet_osm_point WHERE lower(tags->'name') LIKE '%school%'

现在，我需要这样的结果，

完全匹配的结果应优先于部分匹配的结果。例如，名称中只有“学校”的结果应该在返回列表中的第一位，然后是“小学”、“高中”等的结果。

有没有办法重新构造上述查询以获得所需的结果？

Answer 1

像这样的东西？

select
    tags->'name' as name,
    ST_Transform(way,4326) as pt_lonlattext 
from planet_osm_point
where lower(tags->'name') LIKE '%school%'
order by case when lower(tags->'name') = 'school' then 0 else 1 end

或者，更多 DRY 版本：

with cte as (
    select
        tags->'name' as name,
        ST_Transform(way,4326) as pt_lonlattext 
    from planet_osm_point
)
select name, pt_lonlattext 
from cte
where lower(name) like '%school%'
order by case when lower(name) = 'school' then 0 else 1 end