Adding "x-dbtype" to show database field type

[jr3cermak]

@VyseExhale : This is similar to your pull request. There are other places to add the x-dbtype. The reflect_type entry translates the MySQL numeric types to actual types. For now, the other db's will have to tweak the code to provide the full type translation (IE: SqlServer will show numbers for x-dbtype). Since we are just including an x-dbtype, this does not really impact the swagger 2.0 standard at the moment. I tested this against the MySQL test database and resultant json at swagger.io. It is fine. The unit tests for sqlite, postgresql and mysql pass.

It is a step in the right direction I think. Note the icon is really a binary data blob instead of a string. In actuality, I believe you deliver it as a string translated to hex?

            icon:
            type: string
            x-dbtype: blob

Running tests with phpunit-5.7
PHP 7.0.15 (cli) (built: Jan 18 2017 11:21:05) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies

SQLlite
PHPUnit 5.7.13 by Sebastian Bergmann and contributors.

................................................................. 65 / 73 ( 89%)
........ 73 / 73 (100%)

Time: 1.11 seconds, Memory: 10.00MB

OK (73 tests, 107 assertions)

MySQL
PHPUnit 5.7.13 by Sebastian Bergmann and contributors.

................................................................. 65 / 73 ( 89%)
........ 73 / 73 (100%)

Time: 4.25 seconds, Memory: 10.00MB

OK (73 tests, 108 assertions)

PostgreSQL
PHPUnit 5.7.13 by Sebastian Bergmann and contributors.

................................................................. 65 / 73 ( 89%)
........ 73 / 73 (100%)

Time: 1.33 seconds, Memory: 10.00MB

OK (73 tests, 108 assertions)

[BarryDam]

perfect!

[mevdschee]

In actuality, I believe you deliver it as a string translated to hex?

Binary fields are exposed from the driver as hex and then converted to base64 for delivery to the end user.

[mevdschee]

I made the code use "format" to describe the contents of a type "string", while using "x-dbtype" for the database type (so just as proposed and strictly following the standard). I haven't tested properly yet. Maybe you guys can help me.