From 2efe70741686d9fd31a1d45923223302f6c67145 Mon Sep 17 00:00:00 2001
From: Mark Tyers <aa7401@coventry.ac.uk>
Date: Mon, 3 Jul 2017 10:53:23 +0100
Subject: [PATCH] installing mongoDB

---
 00 Introduction.md     |  7 +++++
 07 Data Persistence.md | 59 ++++++++++++++++++++++++++++--------------
 2 files changed, 47 insertions(+), 19 deletions(-)

diff --git a/00 Introduction.md b/00 Introduction.md
index d6719e8..5eb5537 100644
--- a/00 Introduction.md	
+++ b/00 Introduction.md	
@@ -115,3 +115,10 @@ Close the terminal and re-launch. Now you can open any directory.
 
 - `code ~/Documents/bookshop/` opens Visual Studio Code with the contents of the directory specified.
 - `code .` opens Visual Studio Code with the contents of the _current directory_.
+
+### Using a Mac for Development
+
+Computers running MacOS are popular with NodeJS developers. MacOS is a flavour of Unix just like Linux and so all of the commands used in this book will work just fine. The biggest issue is the lack of a decent package manager such as the `apt` package manager found on Ubuntu. To get round this you should install the [Homebrew](https://brew.sh) package manager.
+```
+/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+```
diff --git a/07 Data Persistence.md b/07 Data Persistence.md
index ba84bb9..09cc46e 100644
--- a/07 Data Persistence.md	
+++ b/07 Data Persistence.md	
@@ -44,34 +44,32 @@ exports.addBook = function(isbn, callback) {
 }
 ```
 
-## Relational Database
-
-Familiar data storage
+## 2 Document Database
 
-Supports complex queries
+Stores JavaScript objects
 
-Difficult to scale
+Can be queried using JavaScript
 
-Data needs normalising
-```javascript
-const mysql = require('mysql')
-const request = require('request')
+### 2.1 Installing MongoDB
 
-const connection = mysql.createConnection({ host: 'xxx', port: '3306', user: 'xxx', password: 'xxx', database: 'xxx' })
+There are several ways to access a MongoDB database. You can make use of a cloud provider such as [mLab](https://mlab.com) or you can install the database locally on your development machine.
 
-const sql = 'INSERT INTO books (id, title, authors, description) VALUES (NULL, "The Hobbit, "J.R.R. Tolkien", "Ring found")'
+#### 2.1.1 Installing on Ubuntu
 
-connection.query(sql, (err, rows) => {
-	if (err) callback( Error(`database error: ${err}`) )
-	return callback(null, rows)
-})
-```
 
-## Document Database
 
-Stores JavaScript objects
+#### 2.1.2 Installing on MacOS
 
-Can be queried using JavaScript
+The best way to install it on a Mac is to use the [Homebrew](https://brew.sh) package manager. The installation instructions can be found in the introductory chapter of this book. To install MongoDB
+```
+brew install mongodb
+```
+You need to create a data directory and change its permissions before starting the database server.
+```
+$ mkdir -p /data/db
+$ sudo chown -R `id -un` /data/db
+$ mongod
+```
 
 Mongoose Example.
 
@@ -109,6 +107,29 @@ if (err) {
 
 Good for modelling relationships
 
+## Relational Database
+
+Familiar data storage
+
+Supports complex queries
+
+Difficult to scale
+
+Data needs normalising
+```javascript
+const mysql = require('mysql')
+const request = require('request')
+
+const connection = mysql.createConnection({ host: 'xxx', port: '3306', user: 'xxx', password: 'xxx', database: 'xxx' })
+
+const sql = 'INSERT INTO books (id, title, authors, description) VALUES (NULL, "The Hobbit, "J.R.R. Tolkien", "Ring found")'
+
+connection.query(sql, (err, rows) => {
+	if (err) callback( Error(`database error: ${err}`) )
+	return callback(null, rows)
+})
+```
+
 ## Choosing a Database
 
 Factors: