https://github.com/arthurpaulino/leanmysql

A MySQL API for Lean 4
https://github.com/arthurpaulino/leanmysql

lean4 mysql

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A MySQL API for Lean 4

• Host: GitHub
• URL: https://github.com/arthurpaulino/leanmysql
• Owner: arthurpaulino
• License: apache-2.0
• Created: 2021-11-23T04:23:45.000Z (almost 3 years ago)
• Default Branch: master
• Last Pushed: 2022-03-11T16:58:44.000Z (over 2 years ago)
• Last Synced: 2024-11-01T15:36:44.530Z (16 days ago)
• Topics: lean4, mysql
• Language: Lean
• Homepage:
• Size: 112 KB
• Stars: 17
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# LeanMySQL

This Lean 4 package provides an API for the MySQL database.

Usage example:

```lean

import LeanMySQL

def main : IO Unit := do

  let mysql ← MySQL.mk

  IO.println $ mysql.version

  mysql.login "localhost" "root" "root"

  mysql.createDB "test_db"

  mysql.useDB "test_db"

  mysql.createTable "job" [

    ("id", "INT PRIMARY KEY"),

    ("job_name", "VARCHAR(255)")

  ]

  mysql.insertIntoTable "job" [1, "Computer Scientist"]

  mysql.insertIntoTable "job" [2, "Mathematician"]

  mysql.createTable "person" [

      ("id", "INT PRIMARY KEY"),

      ("name", "VARCHAR(255)"),

      ("age", "INT"),

      ("height", "FLOAT"),

      ("job_id", "INT"),

      ("country_id", "INT")

    ]

  mysql.insertIntoTable "person" [1, "Alice", 20, 1.72, 1, 1]

  mysql.insertIntoTable "person" [2, "Bob", 21, 1.64, 2, 3]

  mysql.insertIntoTable "person" [3, "Craig", 22, 1.76, NULL, 2]

  let df ← mysql.query $

    SELECT name, age, height, job_name

    FROM person LEFT JOIN job ON person.job_id = job.id

    WHERE person.age > 20

  IO.println $ df

  mysql.close

```

The example above prints out:

```

8.0.28

|   name|age|height|       job_name|

|-------|---|------|---------------|

|  'Bob'| 21|  1.64|'Mathematician'|

|'Craig'| 22|  1.76|           NULL|

```

## What's next?

* Allow queries on the `FROM` clause (nested queries)

* Expand the implicit join so it can accept multiple sources, not just two

Feel free to contribute! :D