Generate sql query from a concise query syntax inspired from EdgeDB and GraphQL.

Online Playground: https://better-sql.surge.sh

• [x] output typical sql query, compatible with mysql, postgres, sqlite, e.t.c.
• [x] automatically add table name on columns if not specified
• [x] inner join with nested table {fields}
• [x] left join with nested table [fields]
• [x] nested select sub-query
• [x] where statement
• [x] having statement
• [x] group by statement
• [x] aggregate function, e.g. sum(score)
• [x] order by statement
• [x] limit and offset statement

export function queryToSQL(query: string): string

import { queryToSQL } from 'better-sql.ts'
import { db } from './db'

let keyword = '%script%'
let query = 'select post [...] where title like :keyword'
let sql = queryToSQL(query)
let result = db.query(sql, { keyword })

select post [
  id as post_id
  title
  author_id
  user as author { nickname, avatar } where delete_time is null
  type_id
  post_type {
    name as type
    is_hidden
  } where is_hidden = 0 or user.is_admin = 1
] where created_at >= :since
    and delete_time is null
    and title like :keyword
  order by created_at desc
  limit 25

select
  post.id as post_id
, post.title
, post.author_id
, author.nickname
, author.avatar
, post.type_id
, post_type.name as type
, post_type.is_hidden
from post
inner join user as author on author.id = post.author_id
inner join post_type on post_type.id = post.post_type_id
where author.delete_time is null
  and (post_type.is_hidden = 0
   or user.is_admin = 1)
  and post.created_at >= :since
  and post.delete_time is null
  and post.title like :keyword
order by
  post.created_at desc
limit 25

Details refers to sample.ts and lang.spec.ts

This project is licensed with BSD-2-Clause

This is free, libre, and open-source software. It comes down to four essential freedoms [ref]:

• The freedom to run the program as you wish, for any purpose
• The freedom to study how the program works, and change it so it does your computing as you wish
• The freedom to redistribute copies so you can help others
• The freedom to distribute copies of your modified versions to others