Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
| 1 | <?php |
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| 12 | final class SqliteConnection implements Connection |
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| 13 | { |
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| 14 | use DatabaseTransactionsTrait; |
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| 15 | |||
| 16 | /** |
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| 17 | * $_pdo The PDO instance of the connection. |
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| 18 | * |
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| 19 | * @var PDO |
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| 20 | */ |
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| 21 | private $_pdo; |
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| 22 | |||
| 23 | /** |
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| 24 | * The method called in the constructor. |
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| 25 | * |
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| 26 | * @return void |
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| 27 | */ |
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| 28 | private function __construct() |
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| 37 | |||
| 38 | /** |
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| 39 | * Returns the columns of a table. |
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| 40 | * |
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| 41 | * @param string $table The table inspected for its columns. |
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| 42 | * |
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| 43 | * @return array The columns of the table. |
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| 44 | */ |
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| 45 | View Code Duplication | public function getColumns($table) |
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| 55 | |||
| 56 | /** |
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| 57 | * Returns the Connection's PDO. |
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| 58 | * |
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| 59 | * @return PDO PHP Data Objects |
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| 60 | */ |
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| 61 | public function getPdo() |
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| 65 | |||
| 66 | /** |
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| 67 | * Returns the primary key of a table. |
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| 68 | * |
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| 69 | * @param string $table The table inspected for its primary key. |
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| 70 | * |
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| 71 | * @return string The primary key of the table. |
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| 72 | */ |
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| 73 | public function getPrimaryKey($table) |
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| 81 | |||
| 82 | public static function load() |
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| 86 | } |
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| 87 |
Adding a
@returnannotation to a constructor is not recommended, since a constructor does not have a meaningful return value.Please refer to the PHP core documentation on constructors.