tsvector | 易学教程

Retrieving the most common keywords from a tsvector column

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I'm considering adding a tsvector column to an existing table that will hold possible search terms for multiple columns in that same table (e.g. the tsvector column will equal to_tsvector(header || ' ' || body || ' ' || footer) ). Before I decide to do so, one of my requirements is that I am able to find the most popular keywords amongst all records in the table. Is there anything similar to tsquery that will find my the most popular keywords over all records? Most probably the ts_stat FTS function is what you're after. 来源： https://stackoverflow.com/questions/1851065/retrieving-the-most-common

Rails migrations with database-specific data types

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I'm currently running a Rails migration where I am adding a datatype specific to Postgres, the tsvector. It holds search information in the form that Postgres expects for its built-in text searching capabilities. This is the line from my migration: t.column "search_vectors", :tsvector Everything seems to be working fine, and the search works with it. However, when I opened up schema.rb, this is what I got: Could not dump table "users" because of following StandardError Unknown type 'tsvector' for column 'search_vectors' This is preventing me from running unit tests on the user table, and also

Ruby on Rails: How to sanitize a string for SQL when not using find?

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问题 I'm trying to sanitize a string that involves user input without having to resort to manually crafting my own possibly buggy regex if possible, however, if that is the only way I would also appreciate if anyone can point me in the right direction to a regex that is unlikely to be missing anything. There are a number of methods in Rails that can allow you to enter in native SQL commands, how do people escape user input for those? The question I'm asking is a broad one, but in my particular

Rails migrations with database-specific data types

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问题 I'm currently running a Rails migration where I am adding a datatype specific to Postgres, the tsvector. It holds search information in the form that Postgres expects for its built-in text searching capabilities. This is the line from my migration: t.column "search_vectors", :tsvector Everything seems to be working fine, and the search works with it. However, when I opened up schema.rb, this is what I got: Could not dump table "users" because of following StandardError Unknown type 'tsvector'