todo_api

MySQL-CRUD-API

Simple PHP script that adds a very basic API to a MySQL InnoDB database (or MS SQL Server 2012).

Requirements

• PHP 5.3 or higher with MySQLi or SQLSRV enabled

Installation

This is a single file application! Upload “api.php” somewhere and enjoy!

Limitations

• Authentication or authorization is not included
• Validation on API input is not included

TODO

• Add column permission system
• Add created_at and modified_at support
• Add basic authentication support
• Add user_id and group_id support (multi-tenant)
• Add created_by and modified_by support

Features

• Single PHP file, easy to deploy.
• Very little code, easy to adapt and maintain
• Streaming data, low memory footprint
• Condensed JSON: first row contains field names
• Permission system for databases and tables
• JSONP support for cross-domain requests
• Combined requests with support for multiple table names
• Pagination, sorting, column selection and search support
• Relation detection and filtering on foreign keys
• Relation “transforms” for PHP and JavaScript

Configuration

Edit the following lines in the bottom of the file “api.php”:

$api = new MySQL_CRUD_API(array(
	'username'=>'xxx',
	'password'=>'xxx',
	'database'=>'xxx'
));
$api->executeCommand();

These are all the configuration options and their default values:

$api = new MySQL_CRUD_API(array(
	'username=>'root'
	'password=>null,
	'database=>false,
	'permissions'=>array('*'=>'crudl'),
// for connectivity (defaults to localhost):
	'hostname'=>null,
	'port=>null,
	'socket=>null,
	'charset=>'utf8',
// dependencies (added for unit testing):
	'db'=>null,
	'method'=>$_SERVER['REQUEST_METHOD'],
	'request'=>$_SERVER['PATH_INFO'],
	'get'=>$_GET,
	'post'=>'php://input',
));
$api->executeCommand();

For the alternative SQLSRV_CRUD_API class the following mapping applies:

• username = UID
• password = PWD
• database = Database
• hostname = Server
• port = (Server),port
• socket = (not supported)
• charset = CharacterSet

The other variables are not MySQL or SQL Server specific.

Usage

You can do all CRUD (Create, Read, Update, Delete) operations and extra List operation. Here is how:

List

List all records of a database table.

GET http://localhost/api.php/categories

Output:

{"categories":{"columns":["id","name"],"records":[["1","Internet"],["3","Web development"]]}}

List + Transform

List all records of a database table and transform them to objects.

GET http://localhost/api.php/categories?transform=1

Output:

{"categories":[{"id":"1","name":"Internet"},{"id":"3","name":"Web development"}]}

NB: This transform is CPU and memory intensive and can also be executed client-side.

List + Filter

Search is implemented with the “filter” parameter. You need to specify the column name, a comma, the match type, another commma and the value you want to filter on. These are supported match types:

• cs: contain string (string contains value)
• sw: start with (string starts with value)
• ew: end with (string end with value)
• eq: equal (string or number matches exactly)
• lt: lower than (number is lower than value)
• le: lower or equal (number is lower than or equal to value)
• ge: greater or equal (number is higher than or equal to value)
• gt: greater than (number is higher than value)
• in: in (number is in comma seperated list of values)
  

GET http://localhost/api.php/categories?filter=name,eq,Internet
GET http://localhost/api.php/categories?filter=name,sw,Inter
GET http://localhost/api.php/categories?filter=id,le,1
GET http://localhost/api.php/categories?filter=id,lt,2

Output:

{"categories":{"columns":["id","name"],"records":[["1","Internet"]]}}

List + Filter + Satisfy

Multiple filters can be applied by using “filter[]” instead of “filter” as a parameter name. Then the parameter “satisfy” is used to indicate whether “all” (default) or “any” filter should be satisfied to lead to a match:

GET http://localhost/api.php/categories?filter[]=id,eq,1&filter[]=id,eq,3&satisfy=any
GET http://localhost/api.php/categories?filter[]=id,ge,1&filter[]=id,le,3&satisfy=all
GET http://localhost/api.php/categories?filter[]=id,ge,1&filter[]=id,le,3

Output:

{"categories":{"columns":["id","name"],"records":[["1","Internet"],["3","Web development"]]}}

List + Column selection

By default all columns are selected. With the “columns” parameter you can select specific columns (comma seperated):

GET http://localhost/api.php/categories?columns=name

Output:

{"categories":{"columns":["name"],"records":[["Web development"],["Internet"]]}}

NB: Column selection cannot be applied to related tables.

List + Order

With the “order” parameter you can sort. By default the sort is in ascending order, but by specifying “desc” this can be reversed:

GET http://localhost/api.php/categories?order=name,desc

Output:

{"categories":{"columns":["id","name"],"records":[["3","Web development"],["1","Internet"]]}}

List + Order + Pagination

The “page” parameter holds the requested page. The default page size is 20, but can be adjusted (e.g. to 50):

GET http://localhost/api.php/categories?order=id&page=1
GET http://localhost/api.php/categories?order=id&page=1,50

Output:

{"categories":{"columns":["id","name"],"records":[["1","Internet"],["3","Web development"]],"results":2}}

NB: Pages that are not ordered cannot be paginated.

Create

You can easily add a record using the POST method. The call returns the “last insert id”.

POST http://localhost/api.php/categories
{"id":"1","name":"Internet"}

Output:

1

Read

If you want to read a single object you can use:

GET http://localhost/api.php/categories/1

Output:

{"id":"1","name":"Internet"}

Update

Editing a record is done with the PUT method. The call returns the rows affected.

PUT http://localhost/api.php/categories/2
{"id":"1","name":"Internet networking"}

Output:

1

Delete

The DELETE verb is used to delete a record. The call returns the rows affected.

DELETE http://localhost/api.php/categories/2

Output:

1

Relations

The explanation of this feature is based on the datastructure from the blog.sql database file. This database is a very simple blog datastructure with corresponding foreign key relations between the tables.

You can get the “post” that has “id” equal to “1” with it’s corresponding “categories”, “tags” and “comments” using:

GET http://localhost/api.php/posts,categories,tags,comments?filter=id,eq,1

Output:

{
    "posts": {
        "columns": [
            "id",
            "user_id",
            "category_id",
            "content"
        ],
        "records": [
            [
                "1",
                "1",
                "1",
                "blog started"
            ]
        ]
    },
    "post_tags": {
        "relations": {
            "post_id": "posts.id"
        },
        "columns": [
            "id",
            "post_id",
            "tag_id"
        ],
        "records": [
            [
                "1",
                "1",
                "1"
            ],
            [
                "2",
                "1",
                "2"
            ]
        ]
    },
    "categories": {
        "relations": {
            "id": "posts.category_id"
        },
        "columns": [
            "id",
            "name"
        ],
        "records": [
            [
                "1",
                "anouncement"
            ]
        ]
    },
    "tags": {
        "relations": {
            "id": "post_tags.tag_id"
        },
        "columns": [
            "id",
            "name"
        ],
        "records": [
            [
                "1",
                "funny"
            ],
            [
                "2",
                "important"
            ]
        ]
    },
    "comments": {
        "relations": {
            "post_id": "posts.id"
        },
        "columns": [
            "id",
            "post_id",
            "message"
        ],
        "records": [
            [
                "1",
                "1",
                "great"
            ],
            [
                "2",
                "1",
                "fantastic"
            ]
        ]
    }
}

You can call the mysql_crud_api_tranform() function to structure the data hierarchical like this:

{
    "posts": [
        {
            "id": "1",
            "post_tags": [
                {
                    "id": "1",
                    "post_id": "1",
                    "tag_id": "1",
                    "tags": [
                        {
                            "id": "1",
                            "name": "funny"
                        }
                    ]
                },
                {
                    "id": "2",
                    "post_id": "1",
                    "tag_id": "2",
                    "tags": [
                        {
                            "id": "2",
                            "name": "important"
                        }
                    ]
                }
            ],
            "comments": [
                {
                    "id": "1",
                    "post_id": "1",
                    "message": "great"
                },
                {
                    "id": "2",
                    "post_id": "1",
                    "message": "fantastic"
                }
            ],
            "user_id": "1",
            "category_id": "1",
            "categories": [
                {
                    "id": "1",
                    "name": "anouncement"
                }
            ],
            "content": "blog started"
        }
    ]
}

This transform function is available for PHP and JavaScript in the files mysql_crud_api_tranform.php and mysql_crud_api_tranform.js.

Permissions

By default a single database is exposed with all it’s tables in read-write mode. You can change the permissions by specifying in the ‘permissions’ configuration parameter. This array contains the permissions that are applied. The star character can be used as a wildcard for a full table or database name. Permissions with more specific keys override the values of permissions that contain one or more wildcards. The letters ‘crudl’ in the permission value are the first letters of the ‘create’,‘read’,‘update’,‘delete’,‘list’ operations. Specifying such a letters in the permission value means that the corresponding operation is permitted, while leaving it out, means that the operation is not permitted.

Multi-Database

The code also supports multi-database API’s. These have URLs where the first segment in the path is the database and not the table name. This can be enabled by NOT specifying a database in the configuration. Also the permissions in the configuration should contain a dot character to seperate the database from the table name. The databases ‘mysql’, ‘information_schema’ and ‘sys’ are automatically blocked.

Errors

The following types of 404 ‘Not found’ errors may be reported:

• entity (could not find entity)
• object (instance not found on read)
• input (instance not found on create)
• subject (instance not found on update)
• 1pk (primary key not found or composite)

Tests

Yes, written for PHPUnit. Run:

wget https://phar.phpunit.de/phpunit.phar
php phpunit.phar test.php

No complete coverage yet.

License

MIT