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SQL Query Builder for Javascript | Knex.js
Knex.js (pronounced /kəˈnɛks/) is a "batteries included" SQL query builder for PostgreSQL, CockroachDB, MSSQL, MySQL, MariaDB, SQLite3, Better-SQLite3, Oracle, and Amazon Redshift designed to be flexible, portable, and fun to use. It features both traditional node style callbacks as well as a promise interface for cleaner async flow control, a stream interface, full-featured query and schema build
Convert PostgreSQL to SQLite - Manuel van Rijn
Today I’d like to share the steps I take when I need to convert a PostgreSQL database into a SQLite database. Commonly I have to do this when a Ruby on Rails application is in production and I have to check some issues with the production data. In the production environment we usually use a PostgreSQL database and for developing I use a SQLite database, so we need some conversion. Short story a.k.
ActiveRecord 㧠VIEW を使ã†ã¨ãã®æ³¨æ„点 - moroã®æ—¥è¨˜
備忘録。ã“ã“ã§ã„ㆠVIEW 㯠DB 㧠CREATE VIEW AS .. ã™ã‚‹ã‚ã‚Œã§ã™ã€‚ActionPack ã¨ã¯é–¢ä¿‚ãªã„ã§ã™ã€‚試ã—ãŸã®ã¯ã™ã¹ã¦SQLiteã§ã™ã€‚ ã¨ã‚Šã‚ãˆãšã‘ã£ã“ã†æ™®é€šã«ä½¿ãˆã‚‹ã€‚ 例ãˆã° CREATE VIEW AS calculated_results ã‚’ã™ã‚‹ã¨ã€CalculatedResult クラスã‹ã‚‰æ™®é€šã«èªã‚る。 `id`å•é¡Œ(後述)ã¯æ®‹ã‚‹ã®ã§ view ã‚’ã•ã‚‰ã« include 㧠JOIN ã—よã†ã¨ã™ã‚‹ã¨è½ã¡ã‚‹ `id`カラムãŒã‚ã‚‹ã®ã‚’å‰æã« t.id as t0_id ã¨ã‹ã„ㆠSQL を発行ã™ã‚‹ã®ã§ãã‚“ãªã‚«ãƒ©ãƒ ãªã„よエラーã«ãªã‚‹ã€‚当然ã¨ã„ãˆã°å½“然。 ãã‚‚ãã‚‚ view ã® identifier ã¦ãªã‚“ãªã‚“ã ã‚ã†ãªã。 実利é¢ã ã‘を考ãˆã‚Œã°ã€å…¨ãƒ¬ã‚³ãƒ¼ãƒ‰ NULL ã®ã‚«ãƒ©ãƒ を用æ„ã™ã‚Œã°ã‚ˆã‚ã—。 rake db:schema:dump ã§ã¯æŠœã‘ãªã„ テス
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