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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| 5 | trait Where  | 
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| 6 | { | 
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| 7 | /**  | 
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| 8 | * @var \JAQB\Statement\WhereStatement  | 
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| 9 | */  | 
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| 10 | protected $where;  | 
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| 11 | |||
| 12 | /**  | 
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| 13 | * Sets the where conditions for the query.  | 
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| 14 | *  | 
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| 15 | * @param array|string $field  | 
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| 16 | * @param string|bool $condition condition value (optional)  | 
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| 17 | * @param string $operator operator (optional)  | 
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| 18 | *  | 
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| 19 | * @return self  | 
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| 20 | */  | 
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| 21 | View Code Duplication | public function where($field, $condition = false, $operator = '=')  | 
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| 31 | |||
| 32 | /**  | 
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| 33 | * Adds a where or condition to the query.  | 
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| 34 | *  | 
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| 35 | * @param array|string $field  | 
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| 36 | * @param string $condition condition value (optional)  | 
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| 37 | * @param string $operator operator (optional)  | 
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| 38 | *  | 
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| 39 | * @return self  | 
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| 40 | */  | 
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| 41 | View Code Duplication | public function orWhere($field, $condition = false, $operator = '=')  | 
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| 51 | |||
| 52 | /**  | 
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| 53 | * Sets the where conditions for the query with infix style arguments.  | 
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| 54 | *  | 
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| 55 | * @param array|string $field  | 
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| 56 | * @param string $operator operator (optional)  | 
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| 57 | * @param string|bool $condition condition value (optional)  | 
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| 58 | *  | 
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| 59 | * @return self  | 
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| 60 | */  | 
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| 61 | View Code Duplication | public function whereInfix($field, $operator = '=', $condition = false)  | 
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| 74 | |||
| 75 | /**  | 
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| 76 | * Adds a where or condition to the query with infix style arguments.  | 
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| 77 | *  | 
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| 78 | * @param array|string $field  | 
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| 79 | * @param string $operator operator (optional)  | 
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| 80 | * @param string $condition condition value (optional)  | 
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| 81 | *  | 
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| 82 | * @return self  | 
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| 83 | */  | 
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| 84 | View Code Duplication | public function orWhereInfix($field, $operator = '=', $condition = false)  | 
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| 97 | |||
| 98 | /**  | 
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| 99 | * Adds a where not condition to the query.  | 
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| 100 | *  | 
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| 101 | * @param string $field  | 
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| 102 | * @param string $condition condition value (optional)  | 
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| 103 | *  | 
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| 104 | * @return self  | 
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| 105 | */  | 
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| 106 | public function not($field, $condition = true)  | 
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| 112 | |||
| 113 | /**  | 
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| 114 | * Adds a where between condition to the query.  | 
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| 115 | *  | 
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| 116 | * @param string $field  | 
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| 117 | * @param mixed $a first between value  | 
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| 118 | * @param mixed $b second between value  | 
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| 119 | *  | 
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| 120 | * @return self  | 
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| 121 | */  | 
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| 122 | public function between($field, $a, $b)  | 
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| 128 | |||
| 129 | /**  | 
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| 130 | * Adds a where not between condition to the query.  | 
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| 131 | *  | 
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| 132 | * @param string $field  | 
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| 133 | * @param mixed $a first between value  | 
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| 134 | * @param mixed $b second between value  | 
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| 135 | *  | 
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| 136 | * @return self  | 
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| 137 | */  | 
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| 138 | public function notBetween($field, $a, $b)  | 
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| 144 | |||
| 145 | /**  | 
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| 146 | * Adds an exists condition to the query.  | 
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| 147 | *  | 
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| 148 | * @param callable $f  | 
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| 149 | *  | 
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| 150 | * @return self  | 
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| 151 | */  | 
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| 152 | public function exists(callable $f)  | 
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| 158 | |||
| 159 | /**  | 
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| 160 | * Adds a not exists condition to the query.  | 
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| 161 | *  | 
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| 162 | * @param callable $f  | 
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| 163 | *  | 
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| 164 | * @return self  | 
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| 165 | */  | 
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| 166 | public function notExists(callable $f)  | 
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| 172 | |||
| 173 | /**  | 
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| 174 | * Gets the where statement for the query.  | 
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| 175 | *  | 
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| 176 | * @return \JAQB\Statement\WhereStatement  | 
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| 177 | */  | 
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| 178 | public function getWhere()  | 
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| 182 | }  | 
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| 183 |