DBHub

/** * SQLite Connector Implementation (Template) * * This is a template showing how to implement a new database connector. * To use this connector: * 1. Install the required dependencies: npm install sqlite3 * 2. Implement the methods below * 3. Set DSN=sqlite:///path/to/database.db in your .env file */ import { Connector, ConnectorRegistry, DSNParser, QueryResult, TableColumn } from '../interface.js'; /** * SQLite DSN Parser * Handles DSN strings like: * - sqlite:///path/to/database.db (absolute path) * - sqlite://./relative/path/to/database.db (relative path) * - sqlite::memory: (in-memory database) */ class SQLiteDSNParser implements DSNParser { parse(dsn: string): { dbPath: string } { // Basic validation if (!this.isValidDSN(dsn)) { throw new Error(`Invalid SQLite DSN: ${dsn}`); } try { const url = new URL(dsn); let dbPath: string; // Handle in-memory database if (url.hostname === '' && url.pathname === ':memory:') { dbPath = ':memory:'; } // Handle file paths else { // Get the path part, handling both relative and absolute paths if (url.pathname.startsWith('//')) { // Absolute path: sqlite:///path/to/db.sqlite dbPath = url.pathname.substring(2); // Remove leading // } else { // Relative path: sqlite://./path/to/db.sqlite dbPath = url.pathname; } } return { dbPath }; } catch (error) { throw new Error(`Failed to parse SQLite DSN: ${error instanceof Error ? error.message : String(error)}`); } } getSampleDSN(): string { return 'sqlite:///path/to/database.db'; } isValidDSN(dsn: string): boolean { try { const url = new URL(dsn); return url.protocol === 'sqlite:'; } catch (error) { return false; } } } export class SQLiteConnector implements Connector { id = 'sqlite'; name = 'SQLite'; dsnParser = new SQLiteDSNParser(); private db: any; // This would be the SQLite connection private dbPath: string | null = null; async connect(dsn: string): Promise<void> { const config = this.dsnParser.parse(dsn); this.dbPath = config.dbPath; // Example implementation (requires sqlite3 package) /* return new Promise((resolve, reject) => { const sqlite3 = require('sqlite3').verbose(); this.db = new sqlite3.Database(this.dbPath, (err) => { if (err) { console.error("Failed to connect to SQLite database:", err); reject(err); } else { console.error("Successfully connected to SQLite database"); resolve(); } }); }); */ throw new Error('SQLite connector not implemented yet'); } async disconnect(): Promise<void> { // Close the SQLite connection /* if (this.db) { return new Promise((resolve, reject) => { this.db.close((err) => { if (err) { reject(err); } else { this.db = null; resolve(); } }); }); } */ throw new Error('SQLite connector not implemented yet'); } async getTables(): Promise<string[]> { // Get all tables from SQLite /* return new Promise((resolve, reject) => { this.db.all( `SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%' ORDER BY name`, (err, rows) => { if (err) { reject(err); } else { resolve(rows.map(row => row.name)); } } ); }); */ throw new Error('SQLite connector not implemented yet'); } async tableExists(tableName: string): Promise<boolean> { // Check if a table exists in SQLite /* return new Promise((resolve, reject) => { this.db.get( `SELECT name FROM sqlite_master WHERE type='table' AND name = ?`, [tableName], (err, row) => { if (err) { reject(err); } else { resolve(!!row); } } ); }); */ throw new Error('SQLite connector not implemented yet'); } async getTableSchema(tableName: string): Promise<TableColumn[]> { // Get schema for a specific table /* return new Promise((resolve, reject) => { this.db.all( `PRAGMA table_info(${tableName})`, (err, rows) => { if (err) { reject(err); } else { // Convert SQLite schema format to our standard TableColumn format const columns = rows.map(row => ({ column_name: row.name, data_type: row.type, is_nullable: row.notnull ? 'NO' : 'YES', column_default: row.dflt_value })); resolve(columns); } } ); }); */ throw new Error('SQLite connector not implemented yet'); } async executeQuery(query: string): Promise<QueryResult> { // Execute a query against SQLite const safetyCheck = this.validateQuery(query); if (!safetyCheck.isValid) { throw new Error(safetyCheck.message || "Query validation failed"); } /* return new Promise((resolve, reject) => { this.db.all(query, (err, rows) => { if (err) { reject(err); } else { resolve({ rows }); } }); }); */ throw new Error('SQLite connector not implemented yet'); } validateQuery(query: string): { isValid: boolean; message?: string } { // Basic check to prevent non-SELECT queries const normalizedQuery = query.trim().toLowerCase(); if (!normalizedQuery.startsWith('select')) { return { isValid: false, message: "Only SELECT queries are allowed for security reasons." }; } return { isValid: true }; } } // To enable this connector, uncomment the following lines and install sqlite3: // const sqliteConnector = new SQLiteConnector(); // ConnectorRegistry.register(sqliteConnector);