apply-ddl.mjs
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import { parseYamlConfig } from './yaml-config.mjs'
/**
* Apply a DDL file to a MySQL database using mysql2/promise.
* DB credentials are read from config-vars.yaml's `database:` section.
*
* @param {{configPath: string, ddlPath: string}} opts
* @returns {Promise<void>}
*/
export async function applyDDL({ configPath, ddlPath }) {
const { readFileSync } = await import('node:fs')
const config = parseYamlConfig(readFileSync(configPath, 'utf8'))
const ddl = readFileSync(ddlPath, 'utf8')
const { host, port, user, password, database } = resolveDbConfig(config, configPath)
let mysql
try {
;({ default: mysql } = await import('mysql2/promise'))
} catch {
throw new MysqlUnavailableError()
}
const conn = await mysql.createConnection({
host,
port,
user,
password,
database,
multipleStatements: true,
})
try {
await conn.query(ddl)
} finally {
await conn.end()
}
}
/**
* Resolve mysql2 connection settings from a parsed config-vars.yaml object,
* reading its `database:` section directly. Pure (no I/O), so it is
* unit-testable without mysql2 installed.
*
* Throws if no schema resolves — V1 has no USE/CREATE DATABASE.
*
* @param {Record<string, any>} config parsed config-vars.yaml
* @param {string} [cfgPath] only used to make the error message actionable
* @returns {{host:string, port:number, user:string, password:string, database:string}}
*/
export function resolveDbConfig(config, cfgPath = 'config-vars.yaml') {
const db = (config && config.database) || {}
const host = db.host || '127.0.0.1'
const port = Number(db.port || 3306)
const user = db.user || 'root'
const password = db.password || ''
const database = db.schema || undefined
if (!database) {
throw new Error(`apply-ddl: 缺数据库名 — 请在 ${cfgPath} 的 database.schema 填写`)
}
if (!Number.isInteger(port) || port <= 0 || port > 65535) {
throw new Error(`apply-ddl: 端口非法 — ${cfgPath} 的 database.port 必须是 1..65535 的整数`)
}
return { host, port, user, password, database }
}
/** Distinct error type so the CLI can emit a friendly install hint. */
export class MysqlUnavailableError extends Error {
constructor() {
super('mysql2 is not installed')
this.name = 'MysqlUnavailableError'
}
}
// CLI entry guard：pathToFileURL 规范化 argv[1] 以匹配 import.meta.url（路径含空格 / 非 ASCII / Windows 反斜杠时字面比较会失配）
const { pathToFileURL } = await import('node:url')
if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
const [configPath, ddlPath] = process.argv.slice(2)
if (!configPath || !ddlPath) {
console.error('usage: node lib/apply-ddl.mjs <configPath> <ddlPath>')
process.exit(2)
}
try {
await applyDDL({ configPath, ddlPath })
console.log(`apply-ddl: applied ${ddlPath} using ${configPath}`)
} catch (e) {
if (e instanceof MysqlUnavailableError) {
console.error('apply-ddl: mysql2 not found. Please run `npm i mysql2` in the target project.')
process.exit(1)
}
console.error(`apply-ddl: failed — ${e?.message || e}`)
process.exit(1)
}
}