iagate-querykit/dist/database-manager.js

QueryKit: lightweight TypeScript query toolkit with models, views, triggers, events, scheduler and adapters (better-sqlite3).

export class MultiDatabaseManager {
    static instance;
    adapters = new Map();
    config;
    constructor(config) {
        this.config = config;
    }
    static getInstance(config) {
        if (!MultiDatabaseManager.instance && config) {
            MultiDatabaseManager.instance = new MultiDatabaseManager(config);
        }
        return MultiDatabaseManager.instance;
    }
    async initialize(createAdapter) {
        for (const [name, dbConfig] of Object.entries(this.config.databases)) {
            const adapter = createAdapter(dbConfig);
            await adapter.connect();
            this.adapters.set(name, adapter);
        }
    }
    getAdapter(name) {
        const adapter = this.adapters.get(name);
        if (!adapter)
            throw new Error(`Database adapter '${name}' not found`);
        return adapter;
    }
    getDefaultAdapter() { return this.getAdapter(this.config.defaultDatabase); }
    async executeOnMultiple(databaseNames, query, params) {
        const results = {};
        await Promise.all(databaseNames.map(async (name) => {
            try {
                const adapter = this.getAdapter(name);
                results[name] = await adapter.executeQuery(query, params);
            }
            catch (error) {
                results[name] = { data: [], metadata: { error: error.message } };
            }
        }));
        return results;
    }
}