@matteo.collina/sqlite-pool
v0.4.0
Published
A connection pool for better-sqlite3 compatible with atdatabases suite
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121,778
Readme
sqlite-pool
The @matteo.collina/sqlite-pool
library provides an asynchronous, safe and convenient
API for querying SQLite databases in node.js. Built on top of
better-sqlite3.
When using this module, consider that:
SQLite supports multiple simultaneous read transactions coming from separate database connections, possibly in separate threads or processes, but only one simultaneous write transaction - source.
Usage
import {sql, createConnectionPool} from '@matteo.collina/sqlite-pool';
// or in CommonJS:
// const { createConnectionPool, sql } = require('@matteo.collina/sqlite-pool');
const db = createConnectionPool();
db.query(sql`SELECT * FROM users;`).then(
(results) => console.log(results),
(err) => console.error(err),
);
const createConnectionPool = require('@databases/sqlite-pool');
const {sql} = require('@databases/sqlite-pool');
const db = createConnectionPool();
db.query(sql`SELECT * FROM users;`).then(
(results) => console.log(results),
(err) => console.error(err),
);
For details on how to build queries, see Building SQL Queries
API
createConnectionPool(fileName)
Create a database createConnectionPoolion for a given database. You should only create one createConnectionPoolion per database for your entire applicaiton. Normally this means having one module that creates and exports the createConnectionPoolion pool.
In memory:
import createConnectionPool from '@databases/sqlite-pool';
const db = createConnectionPool();
File system:
import createConnectionPool from '@databases/sqlite-pool';
const db = createConnectionPool(FILE_NAME);
The DatabaseConnection
inherits from DatabaseTransaction
, so you call DatabaseConnection.query
directly instead of having to create a transaction for every query. Since SQLite has very limited support for actual transactions, we only support running one transaction at a time, but multiple queries can be run in parallel. You should therefore only use transactions when you actually need them.
DatabaseConnection.query(SQLQuery): Promise<any[]>
Run an SQL Query and get a promise for an array of results.
DatabaseConnection.queryStream(SQLQuery): AsyncIterable<any>
Run an SQL Query and get an async iterable of the results. e.g.
for await (const record of db.queryStream(sql`SELECT * FROM massive_table`)) {
console.log(result);
}
DatabaseConnection.tx(fn): Promise<T>
Executes a callback function as a transaction, with automatically managed createConnectionPoolion.
A transaction wraps a regular task with additional queries:
- it executes
BEGIN
just before invoking the callback function - it executes
COMMIT
, if the callback didn't throw any error or return a rejected promise - it executes
ROLLBACK
, if the callback did throw an error or return a rejected promise
const result = await db.tx(async (transaction) => {
const resultA = await transaction.query(sql`SELECT 1 + 1 AS a`);
const resultB = await transaction.query(sql`SELECT 1 + 1 AS b`);
return resultA[0].a + resultB[0].b;
});
// => 4
DatabaseConnection.dispose(): Promise<void>
Dispose the DatabaseConnection. Once this is called, any subsequent queries will fail.
License
MIT