DBHub
by bytebase
- src
- connectors
- sqlite
/**
* 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);