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* MySQL Database Adapter for Coherent.js
*
* @fileoverview MySQL adapter implementation with connection pooling and transaction support.
*/
import { normalizeIsolationLevel } from './isolation-level.js';
/**
* Create MySQL adapter instance
*
* @returns {Object} MySQL adapter instance
*/
export function createMySQLAdapter() {
let mysql = null;
async function initializeMySQL() {
if (!mysql) {
try {
const mysqlModule = await import('mysql2/promise');
mysql = mysqlModule.default || mysqlModule;
} catch {
throw new Error('mysql2 package is required for MySQL adapter. Install with: npm install mysql2');
}
}
}
return {
/**
* Create connection pool
*/
async createPool(config) {
await initializeMySQL();
const poolConfig = {
host: config.host,
port: config.port,
database: config.database,
user: config.username,
password: config.password,
connectionLimit: config.pool.max,
acquireTimeout: config.pool.acquireTimeoutMillis,
timeout: config.pool.createTimeoutMillis,
reconnect: true,
charset: 'utf8mb4',
timezone: 'Z'
};
const pool = mysql.createPool(poolConfig);
return pool;
},
/**
* Test database connection
*/
async testConnection(pool) {
const connection = await pool.getConnection();
try {
await connection.query('SELECT 1');
} finally {
connection.release();
}
},
/**
* Execute database query
*/
async query(pool, sql, params = [], options = {}) {
const connection = await pool.getConnection();
try {
const [rows] = await connection.execute(sql, params);
if (options.single) {
return Array.isArray(rows) ? rows[0] || null : rows;
}
if (Array.isArray(rows)) {
return {
rows,
rowCount: rows.length,
affectedRows: rows.affectedRows || rows.length,
insertId: rows.insertId || null
};
} else {
return {
rows: [],
rowCount: rows.affectedRows || 0,
affectedRows: rows.affectedRows || 0,
insertId: rows.insertId || null
};
}
} finally {
connection.release();
}
},
/**
* Start database transaction
*
* @param {Object} pool - mysql2 pool
* @param {Object} [options={}]
* @param {string} [options.isolationLevel] - READ UNCOMMITTED, READ COMMITTED, REPEATABLE READ or SERIALIZABLE
* @param {boolean} [options.readOnly] - Start a READ ONLY transaction
*/
async transaction(pool, options = {}) {
// Validate before taking a connection, so a bad option cannot leak one
const isolationLevel = normalizeIsolationLevel(options.isolationLevel);
const connection = await pool.getConnection();
let released = false;
const release = () => {
Eif (!released) {
released = true;
connection.release();
}
};
try {
if (isolationLevel) {
// Applies to the next transaction started on this connection only
await connection.query(`SET TRANSACTION ISOLATION LEVEL ${isolationLevel}`);
}
if (options.readOnly) {
await connection.query('START TRANSACTION READ ONLY');
} else {
await connection.beginTransaction();
}
} catch (_error) {
release();
throw _error;
}
const assertActive = () => {
Iif (transaction.isCommitted || transaction.isRolledBack) {
throw new Error('Transaction already completed');
}
};
const transaction = {
connection,
pool,
isCommitted: false,
isRolledBack: false,
query: async (sql, params, queryOptions) => {
if (transaction.isCommitted || transaction.isRolledBack) {
throw new Error('Cannot execute query on completed transaction');
}
const [rows] = await connection.execute(sql, params);
if (queryOptions && queryOptions.single) {
return Array.isArray(rows) ? rows[0] || null : rows;
}
if (Array.isArray(rows)) {
return {
rows,
rowCount: rows.length,
affectedRows: rows.affectedRows || rows.length,
insertId: rows.insertId || null
};
} else {
return {
rows: [],
rowCount: rows.affectedRows || 0,
affectedRows: rows.affectedRows || 0,
insertId: rows.insertId || null
};
}
},
commit: async () => {
assertActive();
try {
await connection.commit();
transaction.isCommitted = true;
} catch (_error) {
transaction.isRolledBack = true;
await connection.rollback().catch(() => {});
throw _error;
} finally {
release();
}
},
rollback: async () => {
assertActive();
transaction.isRolledBack = true;
try {
await connection.rollback();
} finally {
release();
}
}
};
return transaction;
},
/**
* Get pool statistics
*/
getPoolStats(pool) {
return {
total: pool.config.connectionLimit,
available: pool._freeConnections ? pool._freeConnections.length : 0,
acquired: pool._allConnections ? pool._allConnections.length - (pool._freeConnections ? pool._freeConnections.length : 0) : 0,
waiting: pool._connectionQueue ? pool._connectionQueue.length : 0
};
},
/**
* Close connection pool
*/
async closePool(pool) {
await pool.end();
}
};
}
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