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# xmysql: one command to generate REST APIs for **any** MySql database

> Requires node >= 7.6.0

## Why this ?
Deriving REST APIs for a database which do not follow conventions of frameworks such as rails, django etc
is like a small adventure ..

<p align="center">
  <img src="https://media.giphy.com/media/8gWrk3QZrjF1C/giphy.gif" alt="Rick & Morty"/>
</p>

Hence this.

Powered by node packages : (express, mysql) => { xmysql }

## Usage
* npm install -g xmysql
* xmysql -h localhost -u mysqlUsername -p mysqlPassword -d databaseName  

## FEATURES
* Generates API for **ANY** MySql database 
* Serves APIs irrespective of naming conventions of primary keys, foreign keys, tables etc
* CRUD : Usual suspects   
* Support for composite primary keys
* Pagination
* Sorting
* Fields
* Relations
* Run dynamic queries

## Sample usage
* npm install -g xmysql
* xmysql -h localhost -u mysqlUsername -p mysqlPassword -d databaseName
* [http://localhost:3000](#http://localhost:3000)


Run HTTP client [Postman](https://www.getpostman.com/) or [similar tools](https://chrome.google.com/webstore/search/http%20client?_category=apps) to invoke REST API calls 

## CRUD APIs Usual Suspects
* GET&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;     /api/:tableName
* POST&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          /api/:tableName
* GET&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;     /api/:tableName/:id
* PUT&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;     /api/:tableName/:id
* GET&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;     /api/:tableName/count
* GET&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;     /api/:tableName/exists
* GET&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;     /api/:parentTable/:id/:childTable 
* DELETE&nbsp;  /api/:tableName/:id
* POST&nbsp;&nbsp;&nbsp;&nbsp;    /dynamic

## Other APIS
* GET&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;     /api/:tableName/describe
* GET&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;     /api/tables

## Support for composite primary keys

#### ___ (three underscores)

```
/api/payments/103___JM555205
```
*___* : If there are multiple primary keys - seperate them by three underscores as shown

## Pagination

#### _p & _size

_p indicates page and _size indicates size of response rows

By default 20 records and max of 100 are returned per GET request on a table.

```
/api/payments?_size=50
```
```
/api/payments?_p=2
```
```
/api/payments?_p=2&_size=50
```


## Sorting

#### _sort

```
/api/payments?_sort=column1
```
eg: sorts ascending by column1

```
/api/payments?_sort=-column1
```
eg: sorts descending by column1

```
/api/payments?_sort=column1,-column2
```
eg: sorts ascending by column1 and descending by column2


## Fields
```
/api/payments?_fields=customerNumber,checkNumber
```
eg: gets only customerNumber and checkNumber in response of each record
```
/api/payments?_fields=-checkNumber
```
eg: gets all fields in table row but not checkNumber


## Run dynamic queries
Dynamic queries on a database can be run by POST method to URL localhost:3000/dynamic 

This is enabled only in local i.e -h localhost or -h 127.0.0.1 option.

Post body takes two fields : query and params.

>query: SQL query or SQL prepared query (ones with ?? and ?)

>params : parameters for SQL prepared query
```
POST /dynamic   

    {
        "query": "select * from ?? limit 1,20",
        "params": ["customers"]
    }
```
## Relational Tables
xmysql identifies foreign key relations automatically and provides GET api.
```
/api/customers/103/payments
```
eg: Customers is parent table and payments is child table. API invocation will result in all payments with customer 103.
 

## When to use ?
* You need REST APIs without much hassle for (ANY) MySql database
* You are learning new frontend frameworks and need REST APIs for your MySql database.
* You are working on a demo, hacks etc

## When NOT to use ?
* Other times not mentioned in when to use section