Alternatives and detailed information of nestjs-pgpromise

pg-promise Module for Nest framework

Description

This's a nest-pgpromise module for Nest. This quickstart guide will show you how to install and execute an example nestjs program..

This document assumes that you have a working nodejs setup in place.

Download from NPM

npm install --save nestjs-pgpromise

Initialize

You need five items in order to connect to the PostgreSQL server.

Params	Description
host	Host IP address or URL.
port	TCP/IP port number to access the database.
database	The name of the database to connect to.
user	The username to access the database.
password	The username's password to access the database.

And you can use as well all the other parameters allowed by pg-promise package. See the documentation.

Provide the credentials for pg-promise module by importing it as :

As Connection object

import { Module } from '@nestjs/common';
import { NestPgpromiseClientController } from './nest-pgpromise-client.controller';
import { NestPgpromiseModule } from 'nestjs-pgpromise';

@Module({
  controllers: [NestPgpromiseClientController],
  imports: [
    NestPgpromiseModule.register({
      connection: {
        host: 'localhost',
        port: 5432,
        database: 'cmdbbtbi',
        user: 'cmadbbtbi',
        password: 'cghQZynG0whwtGki-ci2bpxV5Jw_5k6z',
      },
    }),
  ],
})
export class AppModule {}

As Connection string

import { Module } from '@nestjs/common';
import { NestPgpromiseClientController } from './nest-pgpromise-client.controller';
import { NestPgpromiseModule } from 'nestjs-pgpromise';

@Module({
  controllers: [NestPgpromiseClientController],
  imports: [
    NestPgpromiseModule.register({
      connection: "postgres://YourUserName:YourPassword@YourHost:5432/YourDatabase"
    }),
  ],
})
export class AppModule {}

Then you can use it in the controller or service by injecting it in the controller as:

constructor(@Inject(NEST_PGPROMISE_CONNECTION) private readonly pg: IDatabase<any>) {}

Quick Start Example

This example program connects to postgres on localhost and executes a simple select query from table tasks.

import { Controller, Get, Inject, Logger } from '@nestjs/common';
import { NEST_PGPROMISE_CONNECTION } from 'nestjs-pgpromise';
import { IDatabase } from 'pg-promise';

@Controller()
export class NestPgpromiseClientController {
  private logger = new Logger('controller');
  constructor(@Inject(NEST_PGPROMISE_CONNECTION) private readonly pg: IDatabase<any>) {}

  @Get()
  async index() {
    this.pg
      .any('SELECT * FROM task')
      .then(data => {
        // success;
        this.logger.log(data);
      })
      .catch(error => {
        // error;
        this.logger.log(error);
      });
  }
}

As pg-promise methods return promises, the new async/await syntaxis can be used.

import { Controller, Get, Inject, Logger } from '@nestjs/common';
import { NEST_PGPROMISE_CONNECTION } from 'nestjs-pgpromise';
import { IDatabase } from 'pg-promise';

@Controller()
export class NestPgpromiseClientController {
  private logger = new Logger('controller');
  constructor(@Inject(NEST_PGPROMISE_CONNECTION) private readonly pg: IDatabase<any>) {}

  @Get()
  async index() {
    try {
      const data = await this.pg.any('SELECT * FROM task');
      // success;
      this.logger.log(data);
    } catch(e) {
      // error;
      this.logger.log(error);
    }
  }
}

You can also pass in initoptions as supported by pg-promise.

import { Module } from '@nestjs/common';
import { NestPgpromiseClientController } from './nest-pgpromise-client.controller';
import { NestPgpromiseModule } from 'nestjs-pgpromise';

@Module({
  controllers: [NestPgpromiseClientController],
  imports: [
    NestPgpromiseModule.register({
      connection: {
        host: 'localhost',
        port: 5432,
        database: 'cmdbbtbi',
        user: 'cmadbbtbi',
        password: 'cghQZynG0whwtGki-ci2bpxV5Jw_5k6z',
      },
      initOptions:{/* initialization options */};
    }),
  ],
})
export class AppModule {}