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 | ||
| 8 | class DBSqliteFunctions extends DBBaseFunctions | ||
| 9 | { | ||
| 10 | |||
| 11 | function concat($s1, $s2 = null) | ||
| 15 | |||
| 16 | /** | ||
| 17 | * Given a SQL returns it with the proper LIMIT or equivalent method included | ||
| 18 | * @param string $sql | ||
| 19 | * @param int $start | ||
| 20 | * @param int $qty | ||
| 21 | * @return string | ||
| 22 | */ | ||
| 23 | View Code Duplication | function limit($sql, $start, $qty) | |
| 31 | |||
| 32 | /** | ||
| 33 | * Given a SQL returns it with the proper TOP or equivalent method included | ||
| 34 | * @param string $sql | ||
| 35 | * @param int $qty | ||
| 36 | * @return string | ||
| 37 | */ | ||
| 38 | function top($sql, $qty) | ||
| 42 | |||
| 43 | /** | ||
| 44 | * Return if the database provider have a top or similar function | ||
| 45 | * @return bool | ||
| 46 | */ | ||
| 47 | function hasTop() | ||
| 51 | |||
| 52 | /** | ||
| 53 | * Return if the database provider have a limit function | ||
| 54 | * @return bool | ||
| 55 | */ | ||
| 56 | function hasLimit() | ||
| 60 | |||
| 61 | /** | ||
| 62 | * Format date column in sql string given an input format that understands Y M D | ||
| 63 | * @param string $fmt | ||
| 64 | * @param string|bool $col | ||
| 65 | * @return string | ||
| 66 | * @throws NotImplementedException | ||
| 67 |      * @example $db->getDbFunctions()->SQLDate("d/m/Y H:i", "dtcriacao") | ||
| 68 | */ | ||
| 69 | function sqlDate($fmt, $col = false) | ||
| 73 | |||
| 74 | /** | ||
| 75 | * Format a string date to a string database readable format. | ||
| 76 | * | ||
| 77 | * @param string $date | ||
| 78 | * @param string $dateFormat | ||
| 79 | * @return string | ||
| 80 | */ | ||
| 81 | function toDate($date, $dateFormat) | ||
| 85 | |||
| 86 | /** | ||
| 87 | * Format a string database readable format to a string date in a free format. | ||
| 88 | * | ||
| 89 | * @param string $date | ||
| 90 | * @param string $dateFormat | ||
| 91 | * @return string | ||
| 92 | */ | ||
| 93 | function fromDate($date, $dateFormat) | ||
| 97 | |||
| 98 | /** | ||
| 99 | * | ||
| 100 | * @param DBDataset $dbdataset | ||
| 101 | * @param string $sql | ||
| 102 | * @param array $param | ||
| 103 | * @return int | ||
| 104 | */ | ||
| 105 | View Code Duplication | function executeAndGetInsertedId($dbdataset, $sql, $param) | |
| 116 | } | ||
| 117 | 
Adding explicit visibility (
private,protected, orpublic) is generally recommend to communicate to other developers how, and from where this method is intended to be used.