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<?php |
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/** |
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* Licensed to CRATE Technology GmbH("Crate") under one or more contributor |
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* license agreements. See the NOTICE file distributed with this work for |
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* additional information regarding copyright ownership. Crate licenses |
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* this file to you under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. You may |
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* obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
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* License for the specific language governing permissions and limitations |
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* under the License. |
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* |
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* However, if you have executed another commercial license agreement |
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* with Crate these terms will supersede the license and you may use the |
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* software solely pursuant to the terms of the relevant commercial agreement. |
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*/ |
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namespace Crate\DBAL\Driver\PDOCrate; |
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use Crate\DBAL\Platforms\Crate057Platform; |
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use Crate\DBAL\Platforms\CratePlatform; |
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use Doctrine\DBAL\VersionAwarePlatformDriver; |
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class Driver implements \Doctrine\DBAL\Driver, VersionAwarePlatformDriver |
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{ |
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const VERSION = '0.2.1'; |
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const NAME = 'crate'; |
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const SCHEMA_MIN_VERSION = '0.57.0'; |
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/** |
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* {@inheritDoc} |
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* @return PDOConnection The database connection. |
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*/ |
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public function connect(array $params, $username = null, $password = null, array $driverOptions = array()) |
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{ |
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return new PDOConnection($this->constructPdoDsn($params), $username, $password, $driverOptions); |
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} |
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/** |
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* Constructs the Crate PDO DSN. |
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* |
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* @return string The DSN. |
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*/ |
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private function constructPdoDsn(array $params) |
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{ |
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$dsn = self::NAME . ':'; |
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if (isset($params['host']) && $params['host'] != '') { |
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$dsn .= $params['host']; |
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} else { |
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$dsn .= 'localhost'; |
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} |
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$dsn .= ':' . (isset($params['port']) ? $params['port'] : '4200'); |
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return $dsn; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getDatabasePlatform() |
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{ |
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return new \Crate\DBAL\Platforms\CratePlatform(); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getSchemaManager(\Doctrine\DBAL\Connection $conn) |
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{ |
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return new \Crate\DBAL\Schema\CrateSchemaManager($conn); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getName() |
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{ |
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return self::NAME; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getDatabase(\Doctrine\DBAL\Connection $conn) |
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{ |
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return null; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function createDatabasePlatformForVersion($version) |
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{ |
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if (version_compare($version, self::SCHEMA_MIN_VERSION, ">=")) { |
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return new Crate057Platform(); |
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} else { |
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return new CratePlatform(); |
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} |
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} |
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} |
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crate /
crate-dbal
If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.