Cake SQL Query Builder for Gleam
Cake is a library written in Gleam to compose SQL queries targeting SQL dialects PostgreSQL, SQLite, MariaDB and MySQL.
Installation
gleam add cake
Further documentation can be found on hexdocs.pm/cake.
Usage
Demos
Code examples (from the demos)
- cake_demo_select_and_decode.gleam
- cake_demo_union_and_decode.gleam
- cake_demo_insert.gleam
- cake_demo_delete.gleam
- cake_demo_update.gleam
- cake_demo_insert_on_conflict_update.gleam
- cake_demo_select_join.gleam
- cake_demo_prepared_fragment.gleam
Unit tests as examples
See Cake’s tests, especially the Setup sections in each test module.
You may also compare the tests with the snapshots results.
Intended aliases
Use the following aliases to make the library more ergonomic:
import cake/select as s // SELECT statements
import cake/where as w // WHERE clauses
import cake/join as j // JOIN clauses
import cake/update as u // UPDATE statements
import cake/insert as i // INSERT statements
import cake/delete as d // DELETE statements
import cake/combined as c // For combined queries such as UNION
import cake/fragment as f // For arbitrary SQL code including functions
Library Design
Scope
This is an SQL query building library, thus it is not concerned about executing queries or decoding return values from queries, but merely about being a flexible and powerful tool to compose and craft SQL read and write queries.
Goals
- High degree of flexibility to compose queries: While the focus is on building queries there is also support for replacing or removing parts of queries.
- General support on these 4 large RDMS: PostgreSQL, SQLite, MariaDB and MySQL.
- Not being tied to any specific dialect or dialect adapter library.
- Documentation should be comprehensive.
- It should be easy to use with existing gleam dialect adapters such as:
- Allow to define custom SQL fragments while still being safe from SQL injections by using prepared statements.
Non-goals
- Prohibition of invalid SQL queries: You can still craft invalid queries at
any time, for example:
- Omitting certain parts of queries required for them to run, such as not specifying a table name
- Comparing values incompatible by SQL type
- Backporting many features between different RDMBS. For example, while Cake
supports
RETURNING
on PostgreSQL and SQLite, it does not support it on MariaDB or MySQL. - No automagic optimization: This library is not here to replace SQL knowledge, but to allow crafting and combining SQL queries in a flexible and type safe way. It might however work as a gateway to obtain SQL knowlege because the typed buidler functions help to some degree in understanding how SQL queries can be crafted.
Tested targets
- Sqlite3 as part of ubuntu:latest (Docker)
- postgres:latest (Docker)
- mariadb:latest (Docker)
- mysql:latest (Docker)
The tests run on Erlang but are generally target agnostic: While the primary use case is to run queries on servers, this library runs on any Gleam target and for example in conjunction with sqlite3 WASM/JS you may run queries composed with this library in browsers.
Development
Run test suite locally
bin/docker/attached
# wait a few seconds until everything is ready
# if you run gleam test too early, it will crash
gleam test
Helper commands
bin/docker/attached
bin/docker/detached
bin/docker/down
bin/test
bin/birdie/interactive-review
bin/birdie/accept-all
bin/birdie/reject-all
Library naming
The best part of working with CakePHP 3+ used to be its Query Builder. This library is inspired by that and thus the name.
Thank you @lorenzo and @markstory for creating and maintaining CakePHP and its awesome query builder over the years.