From 64d49717e892024ef43f7e5b7afe6436694f41a3 Mon Sep 17 00:00:00 2001
From: Brian C <brian.m.carlson@gmail.com>
Date: Sun, 16 Jul 2017 17:47:35 -0500
Subject: [PATCH] Destroyed pg (markdown)

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 pg.md | 89 -----------------------------------------------------------
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-# pg
-
-The root __pg__ object returned by `require('pg')` exports a few internal constructors which might be helpful.  
-It has a reference to the other components of node-postgres: 
-
-1. [`pg.Client`](https://github.com/brianc/node-postgres/wiki/Client)
-2. [`pg.Query`](https://github.com/brianc/node-postgres/wiki/Query)
-3. [`pg.Pool`](https://github.com/brianc/node-pg-pool)
-
-There are two common ways to interact with your PostgreSQL server via node-postgres.
-
-First, and what you'll generally want to do is interact with your server via a [pool of clients](https://github.com/brianc/node-pg-pool)
-
-```js
-var Pool = require('pg').Pool;
-var pool = new Pool({
-  user: 'foo',
-  password: 'bar',
-  host: 'localhost',
-  database: 'my_db',
-  max: 10, // max number of clients in pool
-  idleTimeoutMillis: 1000, // close & remove clients which have been idle > 1 second
-});
-
-pool.on('error', function(e, client) {
-  // if a client is idle in the pool
-  // and receives an error - for example when your PostgreSQL server restarts
-  // the pool will catch the error & let you handle it here
-});
-
-// you can run queries directly against the pool
-pool.query('SELECT $1::text as name', ['foo'], function(err, result) {
-  console.log(result.rows[0].name); // output: foo
-});
-
-// the query object implements the promise API
-pool.query('SELECT $1::text as name', ['foo'])
-  .then(res => console.log(res.rows[0].name)); // output: foo
-
-// the pool also supports checking out a client for
-// multiple operations, such as a transaction
-
-pool.connect(function(err, client, release) {
-  // TODO - you'll want to handle the error in real code
-
-  client.query('SELECT $1::text as name', ['foo'], function(err, result) {
-    // you MUST return your client back to the pool when you're done!
-    release();
-    console.log(result.rows[0].name); // output: foo
-  });
-});
-
-// again this api supports promises
-// if you use something like [co](https://github.com/tj/co) 
-// you can end up with much cleaner looking code
-
-co(function * () {
-  var client = yield pool.connect()
-  try {
-      yield client.query('BEGIN')
-      var result = yield client.query('SELECT $1::text as name', ['foo'])
-      yield client.query('INSERT INTO something(name) VALUES($1)', [result.rows[0].name])
-      yield client.query('COMMIT')
-      client.release()
-  } catch(e) {
-    // pass truthy value to release to destroy the client
-    // instead of returning it to the pool
-    // the pool will create a new client next time
-    // this will also roll back the transaction within postgres
-    client.release(true)
-  }
-})
-```
-
-If you want to interact with postgres without using the pool, you can instantiate a client directly & use it as follows:
-
-```js
-var Client = require('pg').Client;
-
-var client = new Client();
-client.connect();
-client.query('SELECT $1::text as name', ['foo'], function(err, res) {
-  console.log(res.rows[0].name);
-  client.end();
-});
-```
-
-***
-[[◄ Back (Installation)|Installation]] `      ` [[Next (API - pg.Client) ►|Client]]
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