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  • simonw · 4 ✖

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  • Wildcard support in query parameters · 4 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions issue performed_via_github_app
398973176 https://github.com/simonw/datasette/issues/321#issuecomment-398973176 https://api.github.com/repos/simonw/datasette/issues/321 MDEyOklzc3VlQ29tbWVudDM5ODk3MzE3Ng== simonw 9599 2018-06-21T04:34:11Z 2018-06-21T16:53:57Z OWNER

This is a little bit fiddly, but it's possible to do it using SQLite string concatenation. Here's an example:

select * from facetable where neighborhood like "%" || :text || "%";

Try it here: https://latest.datasette.io/fixtures-35b6eb6?sql=select+*+from+facetable+where+neighborhood+like+%22%25%22+%7C%7C+%3Atext+%7C%7C+%22%25%22%3B&text=town

 
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 Wildcard support in query parameters 334190959  
399171239 https://github.com/simonw/datasette/issues/321#issuecomment-399171239 https://api.github.com/repos/simonw/datasette/issues/321 MDEyOklzc3VlQ29tbWVudDM5OTE3MTIzOQ== simonw 9599 2018-06-21T16:51:08Z 2018-06-21T16:51:29Z OWNER

I may have misunderstood your problem here.

I understood that the problem is that when using the "%" || :text || "%" construct the first hit to that page (with an empty string for :text) results in a where neighborhood like "%%" query which is slow because it matches every row in the database.

My fix was to add this to the where clause:

where :text != '' and ...

Which means that when you first load the page the where fails to match any rows and you get no results (and hopefully instant loading times assuming SQLite is smart enough to optimize this away). That's why you don't see any rows returned on this page: https://latest.datasette.io/fixtures-cafd088?sql=select+neighborhood%2C+facet_cities.name%2C+state%0D%0Afrom+facetable%0D%0A++++join+facet_cities+on+facetable.city_id+%3D+facet_cities.id%0D%0Awhere+%3Atext+%21%3D+%22%22+and+neighborhood+like+%27%25%27+%7C%7C+%3Atext+%7C%7C+%27%25%27%0D%0Aorder+by+neighborhood%3B

 
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 Wildcard support in query parameters 334190959  
399126228 https://github.com/simonw/datasette/issues/321#issuecomment-399126228 https://api.github.com/repos/simonw/datasette/issues/321 MDEyOklzc3VlQ29tbWVudDM5OTEyNjIyOA== simonw 9599 2018-06-21T14:36:40Z 2018-06-21T14:36:53Z OWNER

This seems to fix that: select neighborhood, facet_cities.name, state from facetable join facet_cities on facetable.city_id = facet_cities.id where :text != '' and neighborhood like '%' || :text || '%' order by neighborhood; Compare this (with empty string): https://latest.datasette.io/fixtures-cafd088?sql=select+neighborhood%2C+facet_cities.name%2C+state%0D%0Afrom+facetable%0D%0A++++join+facet_cities+on+facetable.city_id+%3D+facet_cities.id%0D%0Awhere+%3Atext+%21%3D+%22%22+and+neighborhood+like+%27%25%27+%7C%7C+%3Atext+%7C%7C+%27%25%27%0D%0Aorder+by+neighborhood%3B

To this: https://latest.datasette.io/fixtures-cafd088?sql=select+neighborhood%2C+facet_cities.name%2C+state%0D%0Afrom+facetable%0D%0A++++join+facet_cities+on+facetable.city_id+%3D+facet_cities.id%0D%0Awhere+%3Atext+%21%3D+%22%22+and+neighborhood+like+%27%25%27+%7C%7C+%3Atext+%7C%7C+%27%25%27%0D%0Aorder+by+neighborhood%3B&text=town

 
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 Wildcard support in query parameters 334190959  
398976488 https://github.com/simonw/datasette/issues/321#issuecomment-398976488 https://api.github.com/repos/simonw/datasette/issues/321 MDEyOklzc3VlQ29tbWVudDM5ODk3NjQ4OA== simonw 9599 2018-06-21T04:59:33Z 2018-06-21T06:11:02Z OWNER 
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 Wildcard support in query parameters 334190959  

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