postgrejs

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PostgreJS is a enterprise-level PostgreSQL client for Node.js. It is designed to provide a robust and efficient interface to PostgreSQL databases, ensuring high performance and reliability for enterprise applications. Written entirely in TypeScript, it leverages modern JavaScript features to deliver a seamless development experience.

Library Overview

PostgreJS is a pure JavaScript library, meticulously crafted with TypeScript to offer a strictly typed, well-structured, and highly maintainable codebase. Key highlights include:

• Language: Pure modern JavaScript library.
• Strictly Typed: Completely written in TypeScript, offering strong typing and enhanced development experience.
• Compatibility: Works seamlessly with both CommonJS and ESM module systems, ensuring flexibility in various project setups.
• Comprehensive Testing: Rigorously tested to ensure stability and reliability in production environments.
• Promise-Based API: Asynchronous operations are handled with a Promise-based API, promoting clean and efficient asynchronous code.

Features

• Connection Management: Supports both single connection and advanced pooling, providing scalability and efficient resource management.
• Binary Wire Protocol: Implements the full binary wire protocol for all PostgreSQL data types, ensuring robust and efficient data handling.
• Prepared Statements: Named prepared statements for optimized query execution.
• Cursors: Features fast double-link cache cursors for efficient data retrieval.
• Notifications: High-level implementation for PostgreSQL notifications (LISTEN/NOTIFY), enabling real-time data updates.
• Extensibility: Extensible data-types and type mapping to accommodate custom requirements.
• Parameter Binding: Bind parameters with OID mappings for precise and efficient query execution.
• Array Handling: Supports multidimensional arrays with fast binary encoding/decoding.
• Performance Optimization: Low memory utilization and boosted performance through the use of shared buffers.
• Authorization: SSupports various password algorithms including Clear text, MD5, and SASL, ensuring secure authentication.
• Flexible Data Retrieval: Can return both array and object rows to suit different data processing needs.
• Resource Management: Auto disposal of resources with the "using" syntax (TC30 Explicit Resource Management), ensuring efficient resource cleanup.

Whether you're building a simple application or a complex enterprise system, PostgreJS provides the features and performance you need to succeed. Explore the capabilities of the library and elevate your PostgreSQL integration to the next level.

Installation

$ npm install postgrejs --save

Documentation

Please read :small_orange_diamond: DOCUMENTATION :small_orange_diamond: for detailed usage.

Example usage

Establish a single connection, execute a simple query

import {Connection} from 'postgrejs';
// Create connection
const connection = new Connection('postgres://localhost');
// Connect to database server
await connection.connect();

// Execute query and fetch rows
const result = await connection.query(
    'select * from cities where name like $1',
    {params: ['%york%']});
const rows: any[] = result.rows;
// Do what ever you want with rows

// Disconnect from server
await connection.close(); 

Establish a pooled connection, create a cursor

import {Pool} from 'postgrejs';

// Create connection pool
const db = new Pool({
    host: 'postgres://localhost',
    pool: {
       min: 1,
       max: 10,
       idleTimeoutMillis: 5000
    }
});

// Execute query and fetch cursor
const result = await db.query(
    'select * from cities where name like $1',
    {params: ['%york%'], cursor: true});

// Walk through the cursor, and do whatever you want with fetched rows
const cursor = result.cursor;
let row;
while ((row = await cursor.next())) {
  console.log(row);
}
// Close cursor, (Send connection back to the pool)
await cursor.close();

// Disconnect all connections and shutdown pool
await db.close(); 

Using prepared statements

import {DataTypeOIDs} from 'postgrejs'; 

// .....
const statement = await connection.prepare( 
    'insert into my_table(id, name) values ($1, $2)', {
        paramTypes: [DataTypeOIDs.Int4, DataTypeOIDs.Varchar]
    });

for (let i = 0; i < 100; i++) {
    await statement.execute({params: [i, ('name' + i)]});
}
await statement.close(); // When you done, close the statement to relase resources

Check DOCUMENTATION for other examples.

Type mappings

The table below lists builtin data type mappings.

PosgtreSQL type	JS type	Receive	Send
bool	boolean	text,binary	binary
int2	number	text,binary	binary
int4	number	text,binary	binary
int8	BigInt	text,binary	binary
float4	number	text,binary	binary
float8	number	text,binary	binary
char	string	text,binary	binary
bpchar	string	text,binary	binary
varchar	string	text,binary	binary
date	Date	text,binary	binary
time	Date	text,binary	binary
timestamp	Date	text,binary	binary
timestamptz	Date	text,binary	binary
oid	number	text,binary	binary
bytea	Buffer	text,binary	binary
uuid	string	text,binary	binary
json	object	text,binary	binary
jsonb	object	text,binary	binary
xml	string	text,binary	binary
point	Point	text,binary	binary
circle	Circle	text,binary	binary
lseg	Rectangle	text,binary	binary
box	Rectangle	text,binary	binary
int2Vector	number[]	text,binary	binary
_bool	boolean[]	text,binary	binary
_int2	number[]	text,binary	binary
_int4	number[]	text,binary	binary
_int8	BigInt[]	text,binary	binary
_float4	number[]	text,binary	binary
_float8	number[]	text,binary	binary
_char	string[]	text,binary	binary
_bpchar	string[]	text,binary	binary
_varchar	string[]	text,binary	binary
_date	Date[]	text,binary	binary
_time	Date[]	text,binary	binary
_timestamp	Date[]	text,binary	binary
_timestamptz	Date[]	text,binary	binary
_uuid	string[]	text,binary	binary
_oid	number[]	text,binary	binary
_bytea	Buffer[]	text,binary	binary
_json	object[]	text,binary	binary
_jsonb	object[]	text,binary	binary
_xml	string[]	text,binary	binary
_point	Point[]	text,binary	binary
_circle	Circle[]	text,binary	binary
_lseg	Rectangle[]	text,binary	binary
_box	Rectangle[]	text,binary	binary
_int2Vector	number[][]	text,binary	binary

Support

You can report bugs and discuss features on the GitHub issues page When you open an issue please provide version of NodeJS and PostgreSQL server.

Node Compatibility

• node >= 16.x

License

postgrejs is available under MIT license.

Changelog

v2.21.0

[2024-09-14]

Changes

• Abort pending operations when the socket closes (705063a)
• chore: fixed lint issues (f13dab2)
• Throw exception when trying to run query on a connection that is not yeat ready or closing/closed (96bd55b)