SURVEY: SQL-Like or Shell command syntax

Hello everyone!

I’m writing a new version of LiteDB with better support to string command parser. This language can be used in external tools or via Run method. Also, in new v5 server-mode, this language will be used in REST API and any other protocol to transfer command. SQL syntax are simple and easy do adopt because everyone know SQL. Read reference are almost not needed.

Some examples:

Using SQL-Like syntax

-- Simple data select
SELECT *
  FROM customers
 WHERE name = 'John'

-- Add data transformation
SELECT *,
       phones[type = 'mobile'].number AS mobile
  FROM customers

-- Full query syntax  
 SELECT *
   INTO new_col
   FROM customers
  WHERE _id BETWEEN 0 AND 100
    AND name = "John"
INCLUDE orders, address
  ORDER BY YEAR(birthday)
  LIMIT 100
 OFFSET 10

-- Select with group by 
SELECT key AS age
       COUNT(values) AS counter
  FROM customers
 GROUP BY YEAR(birthday)

-- Creating an index
CREATE UNIQUE INDEX idx_0 ON customers (LOWER(email))

-- Insert data
INSERT INTO customers 
     VALUES { name: "John", year: 2018 } 
         ID INT

-- Update         
UPDATE custumers
   SET name = UPPER(name)
  WHERE year < 2018

And here, same Shell syntax

-- Simple data select
db.customers.select $
              where name = 'John'

-- Add data transformation
db.customers.select EXTEND($, { mobile: phones[type = 'mobile'].number })

-- Full query syntax  
db.customers.select $
               into new_col
              where _id between [0, 100]
                and name = "John"
            include orders, address
              order by YEAR(birthday)
              limit 100
             offset 10

-- Select with group by 
db.customers.select { age: key, counter: COUNT(values) }
              group by YEAR(birthday)

-- Creating an index
db.customers.createIndex idx_0 { expr: LOWER(email), unique: true }

-- Insert data
db.customers.insert { name: "John", year: 2018 } id:int

-- Update         
db.custumers.update EXTEND($, { name: UPPER(name) })
              where year < 2018

Can vote with: ❤️ for SQL 👍 for Shell

Any comment are welcome!

[mbdavid]

Hi @janantos, my first idea was keep all together but I change my mind when next version grows a lot. So, I will keep this feature as a external plugin… and will be deliver only after final v5 version

[janantos]

HI, I would like to keep LiteDB simple. server mode can be implemented on top of it as separate project, myself thinking about creating oData interface for LiteDB