SQueaL

Type Safe SQL in Swift

Squeal is the sound you make when you realize there's a typo in your SQL statement.

Demo time 🍿

Raw SQL

let query = """
    SELECT email FROM users
    WHERE id = 1
    AND name = 'jack' 
    LIMIT 1
"""

Using Squeal

let query = SQL
    .SELECT(\.email, FROM: users)
    .WHERE(\.id == 1)
    .AND(\.name == "jack")
    .LIMIT(1)

hint: users is a Table object that represents the users table in the database schema.

Disclaimer

This is early
Use at your own risk
Only supports Postgres syntax at the moment

Why

• ORMS have a lot of issues (see below), mainly:

  • Need to learn an other pseudo language
  • Complex
  • Hides what's really going on under the hood
  • Performace issues

• The alternative, writing Pure SQL comes with major drawbacks:

  • No more type safety
  • No IDE support

What if we could have the best of both worlds?

Requirements

• Should Read like SQL
• Be Type-safe
• Should Enforce correct SQL Syntax with IDE autocompletion
• Usable in place of raw SQL Strings

How

• By designing a Swift API that mimics SQL statements almost one to one
• By leveraging the incredible Swift's type system to enforce correctness at compile time
• By using Swift Type system to enforce SQL syntax
• By using Swift's CustomStringConvertible protocol to generate raw SQL strings

ORM issues great reads

Don't use an ORM - Prime reacts
The Vietnam of Computer Science
Object-Relational Mapping is the Vietnam of Computer Science
ORM is an anti-pattern
In defence of SQL