Merge with Faisal's code

Author: Ignacio Elizaga

.gitignore

@@ -15,4 +15,3 @@
 
 .vagrant/
 Vagrantfile
-pivotal_mockd_hackathon

LICENSE

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+MIT License
+
+Copyright (c) 2017 Ignacio Elizaga
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# MockD [![Go Version](https://img.shields.io/badge/go-v1.7.4-green.svg?style=flat-square)](https://golang.org/dl/) [![MIT License](https://img.shields.io/badge/License-MIT_License-green.svg?style=flat-square)](https://github.com/ielizaga/mockd/blob/master/LICENSE)
+                                                                                                                                                                                                       
+MockD is built of simple catchphrase
+
+    Here are my tables
+    Load data for me
+    I don't care how
+
+with MockD you can have your own tables defined with datatypes, just supply the connection, total data needed and the tables and leave MockD to build random generated dataset on those tables.
+
+MockD does try to ensure it acknowledge the constraints in the database and try to fix PK / UK / FK constraints, but it not foolproof. hence its **HIGHLY RECOMMEDED** you do take a backup of your database before you ask MockD to load data.
+
+An ideal environment to make MockD work without any error's would be 
+
++ No constraints
++ No custom datatypes
+
+Check on "Known Issues" below for things are currently not working
+
+# Important Information
+
+MockD program is created for generating test data and **NOT TO BE USED IN PRODUCTION DATABASE**, ensure you have the backup of the database before asking MockD to load data for you.
+
+# Supported database
+
++ Postgres
++ Greenplum (GPDB)
++ Hawq (HDB) 
++ MySQL / Oracle ( coming soon <img src="https://media.giphy.com/media/MhS3BBBdYAxEc/giphy.gif" width="18" height="10"> ) 
+
+# Supported datatypes
+
++ All datatypes that are listed on the [postgres datatype](https://www.postgresql.org/docs/9.6/static/datatype.html) website are supported
++ As Greenplum / Hawq is a fork from postgres, the supported postgres datatype also applies here.
+
+# Go Library Package Dependencies
+
++ [Data Faker](https://github.com/icrowley/fake) by icrowley
++ [Progress bar](https://github.com/vbauerster/mpb) by vbauerster
++ [Postgres Driver](https://github.com/lib/pq) by lib/pq
++ [Go Logger](https://github.com/op/go-logging) by op/go-logging
+
+# How it works.
+
++ Parse the argument parameters
++ Check if the database connection can be established and queries work.
++ If all database flag is set, then extract all the tables in the database
++ if tables are specified then uses only those tables.
++ First creates a backup of all constraints ( like PK (primary key), UK, CK, FK ) and also unique index ( due to cascade nature of the drop constraints )
++ Also store this constraint / Unique index information on the memory
++ Before loading it will remove all the constraints on the table
++ Once done, it will start its loaded by picking random data based on the columns datatype.
++ Once its done, it read all the constraints information from the memory
++ fixes PK and UK initially
++ then fixes FK
++ Check constraints are ignored ( since its not easy to translate it )
++ Once done it loads all the constraints that it had backed up ( MockD fails mostly at this stage if its not able to autofix the constraints violation )
++ Program ends.
+
+# Usage
+
+```
+USAGE: mockd <DATABASE ENGINE> <OPTIONS>
+DATABASE ENGINE:
+	postgres        Postgres database
+	greenplum       Greenplum database
+	hdb             Hawq Database
+	help            Show help
+OPTIONS:
+	Execute "mockd <database engine> -h" for all the database specific options
+```
+
+# How to use it
+
+### MockD User
+
++ [Download](https://github.com/ielizaga/mockd/archive/master.zip) the github repo or clone the github repo
+
+```
+git clone https://github.com/ielizaga/mockd.git
+```
+
++ Navigate to the "bin" directory
++ Use the appropriate binary that matches your OS
+
+```
+XXXXX:bin XXXXX ls -ltr
+total 26832
+-rwxr-xr-x  1 XXXXX  XXXXX  6878692 Jul 16 10:44 mockd-mac
+-rwxr-xr-x  1 XXXXX  XXXXX  6853562 Jul 16 10:44 mockd-linux
+```
+
+**NOTE:** if you have the datatype UUID defined on the table, make sure you have the execute "uuidgen" installed on the OS.  
+
+### Developers
+
++ [Download](https://github.com/ielizaga/mockd/archive/master.zip) the github repo or clone the github repo
+
+```
+git clone https://github.com/ielizaga/mockd.git
+```
+
+or use "go get" to download the source after setting the GOPATH
+
+```
+go get github.com/ielizaga/mockd
+```
+
++ Download all the dependencies
+
+```
+go get github.com/icrowley/fake
+go get github.com/vbauerster/mpb
+go get github.com/lib/pq
+go get github.com/op/go-logging
+```
+
++ You can modify the code and execute using command before creating a build
+
+```
+go run *.go <database engine>
+```
+
++ To build binaries for different OS, you can use for eg.s
+
+```
+env GOOS=linux GOARCH=amd64 go build
+```
+
+# Command Reference
+
++ For postgres / greenplum / hawq 
+
+```
+XXXXX:bin XXXXX ./mockd-mac postgres -help
+2017-07-16 10:58:43.609:INFO > Parsing all the command line arguments
+Usage of postgres:
+  -d string
+    	The database name where the table resides (default "postgres")
+  -h string
+    	The hostname that can be used to connect to the database (default "localhost")
+  -i	Ignore checking and fixing constraint issues
+  -n int
+    	The total number of mocked rows that is needed (default 1)
+  -p int
+    	The port that is used by the database engine (default 5432)
+  -t string
+    	The table name to be filled in with mock data
+  -u string
+    	The username that can be used to connect to the database (default "postgres")
+  -w string
+    	The password for the user that can be used to connect to the database
+  -x	Mock all the tables in the database
+```
+
+# Examples
+
++ Mock one table will random data
+
+```
+bin/mockd-mac <dbengine> -n <total rows> -u <user> -d <database> -t <table>
+```
+
+![single table](https://github.com/ielizaga/mockd/blob/master/img/singletable.gif)
+
++ Mock multiple table with random data
+
+```
+bin/mockd-mac <dbengine> -n <total rows> -u <user> -d <database> -t <table1>,<table2>,....
+```
+
+![multiple table](https://github.com/ielizaga/mockd/blob/master/img/multipletable.gif)
+
++ Mock entire database
+
+```
+bin/mockd-mac <dbengine> -n <total rows> -u <user> -d <database> -x
+```
+
+![All Database](https://github.com/ielizaga/mockd/blob/master/img/alldb.gif)
+
+# Known Issues
+
+1. If you uses a small amount of rows to mock and you have defined a composite PK index, there are chances that the primary key would fail ( this is due to foreign key fix only runs after primary key fix )
+2. Still having issues with Check constraint, only check that works is "COLUMN > 0" & nothing else
+3. On Greenplum/HDB partition tables are not supported (due to check constraint issues defined above). 
+4. Custom datatypes are not supported
+
+
+# Community
+
+You can sumbit issues or pull request via [github](https://github.com/ielizaga/mockd) and we will try our level best to fix them..
+
+# Authors
+
+[![Ignacio](https://img.shields.io/badge/github-Ignacio_Elizaga-green.svg?style=social)](https://github.com/ielizaga) [![Aitor](https://img.shields.io/badge/github-Aitor_Cedres-green.svg?style=social)](https://github.com/Zerpet) [![Juan](https://img.shields.io/badge/github-Juan_Ramos-green.svg?style=social)](https://github.com/jujoramos) [![Faisal](https://img.shields.io/badge/github-Faisal_Ali-green.svg?style=social)](https://github.com/faisaltheparttimecoder) [![Adam](https://img.shields.io/badge/github-Adam_Clevy-green.svg?style=social)](https://github.com/adamclevy)
+
+