A database schema inspector...

... a very lightweight one. Iterate through all your databases, tables and columns without having to lookup the correct query syntax for your specific database system.

composer require dfba/schema

Examples

If you're using Laravel this will be extra easy:

Add the following line to the 'providers' section of your app.php config file:

Dfba\Schema\Laravel\SchemaServiceProvider::class,

From this point on you can inject Dfba\Schema\Schema into your application. For example:

<?php
namespace App\Http\Controllers;

use Illuminate\Routing\Controller as BaseController;

use Dfba\Schema\Schema; // Very crucial line

class ExampleController extends BaseController {
    
	public function test(Schema $schema) {
		// --------------^ HERE


		// Some demo code:
		echo "<b>". $schema->getName() ."</b><br>";

		foreach ($schema->getTables() as $table) {
			echo "__ <b>". $table->getName() ."</b><br>";

			foreach ($table->getColumns() as $column) {
				echo "__ __ <b>". 
					$column->getName() ."</b><br>";

				echo "__ __ __ <i>dataType:</i> ".
					$column->getDataType() ."<br>";
				echo "__ __ __ <i>unsigned:</i> ".
					$column->getUnsigned() ."<br>";
				echo "__ __ __ <i>zerofill:</i> ".
					$column->getZerofill() ."<br>";
				echo "__ __ __ <i>nullable:</i> ".
					$column->getNullable() ."<br>";
				echo "__ __ __ <i>defaultValue:</i> ".
					$column->getDefaultValue() ."<br>";
				echo "__ __ __ <i>options:</i> ".
					implode(', ', $column->getOptions() ?: []) ."<br>";
				echo "__ __ __ <i>autoIncrement:</i> ".
					$column->getAutoIncrement() ."<br>";
				echo "__ __ __ <i>maximumLength:</i> ".
					$column->getMaximumLength() ."<br>";
				echo "__ __ __ <i>minimumValue:</i> ".
					$column->getMinimumValue() ."<br>";
				echo "__ __ __ <i>maximumValue:</i> ".
					$column->getMaximumValue() ."<br>";
				echo "__ __ __ <i>precision:</i> ".
					$column->getPrecision() ."<br>";
				echo "__ __ __ <i>scale:</i> ".
					$column->getScale() ."<br>";
				echo "__ __ __ <i>characterSet:</i> ".
					$column->getCharacterSet() ."<br>";
				echo "__ __ __ <i>collation:</i> ".
					$column->getCollation() ."<br>";
				echo "__ __ __ <i>comment:</i> ".
					$column->getComment() ."<br>";
			}
		}

	}
}

Injecting Dfba\Schema\Schema in your code will fetch the schema for the currently configured database. That means you'll need to have a database set up and configured ;)

Note: it's possible to read the database metadata for any open connection, not just the default Laravel one. The Dfba\Schema\Manager will happily burp out Schemas as long as you feed it PDO connections and database names:

<?php
namespace App\Http\Controllers;

use Illuminate\Routing\Controller as BaseController;

use Dfba\Schema\Manager; // Very crucial line

class ExampleController extends BaseController {

	public function test(Manager $manager) {
		
		$anyRandomPdo = \DB::connection()->getReadPdo();
		$someSchemaName = 'example';

		$schema = $manager->getSchema($anyRandomPdo, $someSchemaName);

		var_dump($schema);
		
	}
}

Good plain ol' PHP (or other frameworks)

I haven't forgotten about you:

$schemaManager = new Dfba\Schema\Manager();
$anyRandomPdo = new PDO("mysql:host=localhost;dbname=example", "username", "password");
$someSchemaName = 'example';

$schema = $schemaManager->getSchema($anyRandomPdo, $someSchemaName);

var_dump($schema);

You should be aware of that the Dfba\Schema\Manager caches retrieved schemas to prevent fetching the same data multiple times. If you create new Dfba\Schema\Manager instances over and over again, you won't benefit from the cache.

Postgres, SQL Server, etc.?

Oh... yeah. MySQL and SQLite are the only databases currently implemented. I have extracted all the database specific code into it's own file, though. You want other databases implemented? Open an issue, or better yet: copy src/MySqlSchemaFactory.php and do it yourself. It's not that hard! You can do it! :)