golem-add-mysql-moonbit

Agent Building

Using golem:rdbms/mysql from a MoonBit Golem agent. Use when the user asks to connect to MySQL, run SQL, or use MySQL from MoonBit agent code.

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How to use this skill

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Prompt to paste

I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/golemcloud/golem/blob/HEAD/golem-skills/skills/moonbit/golem-add-mysql-moonbit/SKILL.md

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First, summarize what it does, its dependencies, license status if identifiable, and any risks. Show the exact files you propose to add under .agents/skills/golem-add-mysql-moonbit/. Do not write files or run scripts until I approve.

After I approve, install the complete skill folder, including required referenced files, into that project location. Verify it is discoverable, then tell me its actual invocation name and how to use it. Do not claim it is installed until you have verified it.

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Using MySQL from a MoonBit Agent

The MoonBit SDK already includes the generated package for golem:rdbms/mysql@1.5.0.

Add the Package Import

In the component's moon.pkg, add an alias for the package:

import {
  "golemcloud/golem_sdk/interface/golem/rdbms/mysql" @mysql,
}

Open a Connection

let conn = @mysql.DbConnection::open("mysql://user:password@localhost:3306/app")
  .or_error!("failed to connect to MySQL")

Query Data

MySQL placeholders use ?.

let result = conn.query(
  "SELECT ?",
  [@mysql.DbValue::Varchar("hello")],
).or_error!("query failed")

let row = result.rows[0]
let value = row.values[0]

let message = match value {
  @mysql.DbValue::Varchar(value) => value
  @mysql.DbValue::Text(value) => value
  @mysql.DbValue::Tinytext(value) => value
  @mysql.DbValue::Mediumtext(value) => value
  @mysql.DbValue::Longtext(value) => value
  @mysql.DbValue::Fixchar(value) => value
  _ => abort("unexpected MySQL value")
}

Execute Statements

conn.execute(
  "INSERT INTO notes (id, body) VALUES (?, ?)",
  [@mysql.DbValue::Int(1), @mysql.DbValue::Varchar("hello")],
).or_error!("insert failed")

Transactions

let tx = conn.begin_transaction().or_error!("failed to start transaction")
tx.execute(
  "UPDATE notes SET body = ? WHERE id = ?",
  [@mysql.DbValue::Varchar("updated"), @mysql.DbValue::Int(1)],
).or_error!("update failed")
tx.commit().or_error!("commit failed")