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postgresql-client

Enterprise level PostgreSQL client for NodeJs

Library

• Pure JavaScript library completely written in TypeScript
• Works with both CommonJS and ESM module systems
• Well tested
• Strictly typed
• Asynchronous Promise based api

Features

• Both single connection and advanced pooling support
• Full binary wire protocol support for all data types
• Named Prepared Statements
• Cursors with fast double-link cache
• High level implementation for notifications (LISTEN/NOTIFY)
• Extensible data-types and type mapping
• Bind parameters with OID mappings
• Multidimensional arrays with fast binary encoding/decoding
• Low memory utilization and boosted performance with Shared Buffers
• Supports Clear text, MD5 and SASL password algorithms
• Can return both array and object rows
• Auto disposal with "using" syntax (TC30 Explicit Resource Management)

Installation

$ npm install postgresql-client --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 'postgresql-client';
// 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 'postgresql-client';

// 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 'postgresql-client'; 

// .....
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.

| Posgtres 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

postgresql-client is available under MIT license.