From 241f41fda5c1fd6f5ebc9748ee0aa7d73fb52de2 Mon Sep 17 00:00:00 2001
From: Brian C <brian.m.carlson@gmail.com>
Date: Sun, 16 Jul 2017 17:48:55 -0500
Subject: [PATCH] Destroyed Transactions (markdown)

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 Transactions.md | 75 -------------------------------------------------
 1 file changed, 75 deletions(-)
 delete mode 100644 Transactions.md

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-node-postgres does not have any special APIs for dealing with transactions; just use sql.  
-
-Below are two examples of how to run transactions.  Generally you'll probably use some kind of flow control library or abstract this behind a function or something.  I use nothing but node & pg to keep the examples as clear as possible.
-
-Here is how you would do a transaction using the client pool:
-```js
-var pg = require('pg');
-var rollback = function(client, done) {
-  client.query('ROLLBACK', function(err) {
-    //if there was a problem rolling back the query
-    //something is seriously messed up.  Return the error
-    //to the done function to close & remove this client from
-    //the pool.  If you leave a client in the pool with an unaborted
-    //transaction weird, hard to diagnose problems might happen.
-    return done(err);
-  });
-};
-pg.connect(function(err, client, done) {
-  if(err) throw err;
-  client.query('BEGIN', function(err) {
-    if(err) return rollback(client, done);
-    //as long as we do not call the `done` callback we can do 
-    //whatever we want...the client is ours until we call `done`
-    //on the flip side, if you do call `done` before either COMMIT or ROLLBACK
-    //what you are doing is returning a client back to the pool while it 
-    //is in the middle of a transaction.  
-    //Returning a client while its in the middle of a transaction
-    //will lead to weird & hard to diagnose errors.
-    process.nextTick(function() {
-      var text = 'INSERT INTO account(money) VALUES($1) WHERE id = $2';
-      client.query(text, [100, 1], function(err) {
-        if(err) return rollback(client, done);
-        client.query(text, [-100, 2], function(err) {
-          if(err) return rollback(client, done);
-          client.query('COMMIT', done);
-        });
-      });
-    });
-  });
-});
-```
-
-Here is how you would do a transaction using a single instance of a client:
-
-```js
-var Client = require('pg').Client;
-
-var client = new Client(/*your connection info goes here*/);
-client.connect();
-
-var rollback = function(client) {
-  //terminating a client connection will
-  //automatically rollback any uncommitted transactions
-  //so while it's not technically mandatory to call
-  //ROLLBACK it is cleaner and more correct
-  client.query('ROLLBACK', function() {
-    client.end();
-  });
-};
-
-client.query('BEGIN', function(err, result) {
-  if(err) return rollback(client);
-  client.query('INSERT INTO account(money) VALUES(100) WHERE id = $1', [1], function(err, result) {
-    if(err) return rollback(client);
-    client.query('INSERT INTO account(money) VALUES(-100) WHERE id = $1', [2], function(err, result) {
-      if(err) return rollback(client);
-      //disconnect after successful commit
-      client.query('COMMIT', client.end.bind(client));
-    });
-  });
-});
-```
-
-***
-[[◄ Back (Prepared Statements)|Prepared-Statements]] `      ` [[Next (FAQ) ►|FAQ]]
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