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# xmysql: one command to generate REST APIs for **any** MySql database
## Why this ?
Generating REST APIs quickly for a MySql database which does not follow conventions of
frameworks such as rails, django etc is a small adventure that one rather like to avoid ..
< p align = "center" >
< img src = "https://media.giphy.com/media/8gWrk3QZrjF1C/giphy.gif" alt = "Rick & Morty" / >
< / p >
Hence this.
Powered by node packages : ([express](https://github.com/expressjs/express), [mysql ](https://github.com/mysqljs/mysql )) => { [xmysql ](https://github.com/o1lab/xmysql ) }
## Setup and Usage
```
npm install -g xmysql
```
```
xmysql -h localhost -u mysqlUsername -p mysqlPassword -d databaseName
```
```
http://localhost:3000
```
That's it!
## 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
* Group By
* Group By, Order By
* Aggregate functions :tada:
* Relations
* Run dynamic queries
* Upload single file
* Upload multiple files
* Download file
Use HTTP clients like [Postman ](https://www.getpostman.com/ ) or [similar tools ](https://chrome.google.com/webstore/search/http%20client?_category=apps ) to invoke REST API calls
____
Download [node ](https://nodejs.org/en/download/current/ ),
[mysql ](https://dev.mysql.com/downloads/mysql/ )
[(setup mysql) ](https://dev.mysql.com/doc/mysql-getting-started/en/#mysql-getting-started-installing ),
[sample database ](https://dev.mysql.com/doc/employee/en/employees-installation.html ) -
if you haven't on your system.
## Root URL
Root URL (localhost:3000/) returns all REST API urls for each table in schema.
## CRUD APIs Usual Suspects
* GET /api/tableName
* POST /api/tableName
* GET /api/tableName/:id
* PUT /api/tableName/:id
* GET /api/tableName/count
* GET /api/tableName/exists
* GET /api/tableName/groupby
* GET /api/tableName/aggregate
* GET /api/parentTable/:id/childTable
* DELETE /api/tableName/:id
* POST /dynamic
## Other APIS
* GET /api/tableName/describe
* GET /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
```
## Order by / Sorting
#### ASC
```
/api/payments?_sort=column1
```
eg: sorts ascending by column1
#### DESC
```
/api/payments?_sort=-column1
```
eg: sorts descending by column1
#### Multiple fields in sort
```
/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
## Group By
```
/api/offices/groupby?_fields=country
```
eg: SELECT country,count(*) FROM offices GROUP BY country
```
/api/offices/groupby?_fields=country,city
```
eg: SELECT country,city,count(*) FROM offices GROUP BY country,city
## Group By, Order By
```
/api/offices/groupby?_fields=country,city& sort=city
```
eg: SELECT country,city,count(*) FROM offices GROUP BY country,city ORDER BY city ASC
```
/api/offices/groupby?_fields=country,city& sort=city,country
```
eg: SELECT country,city,count(*) FROM offices GROUP BY country,city ORDER BY city ASC, country ASC
```
/api/offices/groupby?_fields=country,city& sort=city,-country
```
eg: SELECT country,city,count(*) FROM offices GROUP BY country,city ORDER BY city ASC, country DESC
## Aggregate functions :jack_o_lantern: :sunglasses:
```
http://localhost:3000/api/payments/aggregate?_fields=amount
response body
[
{
"min_of_amount": 615.45,
"max_of_amount": 120166.58,
"avg_of_amount": 32431.645531,
"sum_of_amount": 8853839.23,
"stddev_of_amount": 20958.625377426568,
"variance_of_amount": 439263977.71130896
}
]
```
eg: retrieves all numeric aggregate of a column in a table
```
http://localhost:3000/api/orderDetails/aggregate?_fields=priceEach,quantityOrdered
response body
[
{
"min_of_priceEach": 26.55,
"max_of_priceEach": 214.3,
"avg_of_priceEach": 90.769499,
"sum_of_priceEach": 271945.42,
"stddev_of_priceEach": 36.576811252187795,
"variance_of_priceEach": 1337.8631213781719,
"min_of_quantityOrdered": 6,
"max_of_quantityOrdered": 97,
"avg_of_quantityOrdered": 35.219,
"sum_of_quantityOrdered": 105516,
"stddev_of_quantityOrdered": 9.832243813502942,
"variance_of_quantityOrdered": 96.67301840816688
}
]
```
eg: retrieves numeric aggregate can be done for multiple columns too
## 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.
## Run dynamic queries
Dynamic queries on a database can be run by POST method to URL localhost:3000/dynamic
This is enabled only when using local mysql server 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"]
}
```
## Upload single file
```
POST /upload
```
eg: curl --form file=@/Users/me/Desktop/a.png http://localhost:3000/upload
returns uploaded file name else 'upload failed'
(Note: POSTMAN has issues with file uploading hence examples with curl)
## Upload multiple files
```
POST /uploads
```
> Notice 's' near /api/upload**s** and file**s** in below example
eg: curl --form files=@/Users/me/Desktop/a.png --form files=@/Users/me/Desktop/b.png http://localhost:3000/uploads
returns uploaded file names as string
## Download file
http://localhost:3000/download?name=fileName
> For upload and download of files -> you can specify storage folder using -s option
> Upload and download apis are available only with local mysql server
## When to use ?
* You need just 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 ?
* If you are in need of a full blown MVC framework, ACL, Authorisation etc - Not this.
* Other times not mentioned in when to use section
### Command line options
```
Options:
-V, --version output the version number
-h, --host < n > hostname of mysql
-d, --database < n > database schema name
-u, --user < n > username of database / root by default
-p, --password < n > password of database / empty by default
-n, --portNumber < n > port number / 3000 by default
-s, --storageFolder < n > storage folder / current working dir by default
-h, --help output usage information
Examples:
$ xmysql -u username -p password -d databaseSchema
```
