Complex classes like ExprBuilder often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use ExprBuilder, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 22 | class ExprBuilder implements ExpressionInterface |
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| 23 | { |
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| 24 | /** |
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| 25 | * @var ExpressionInterface $wrappedExpression |
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| 26 | */ |
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| 27 | private $wrappedExpression; |
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| 28 | |||
| 29 | /** |
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| 30 | * ExprBuilder constructor. |
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| 31 | */ |
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| 32 | 25 | public function __construct() |
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| 36 | /** |
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| 37 | * @param mixed $expression |
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| 38 | * |
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| 39 | * @return ExpressionInterface |
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| 40 | */ |
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| 41 | 31 | public static function normalizeExpression($expression) |
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| 71 | |||
| 72 | /** |
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| 73 | * @return ExpressionInterface |
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| 74 | */ |
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| 75 | 1 | public function getWrappedExpression() |
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| 79 | |||
| 80 | /** |
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| 81 | * @inheritdoc |
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| 82 | */ |
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| 83 | 25 | public function compile() |
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| 87 | |||
| 88 | /** |
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| 89 | * @param mixed $alias |
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| 90 | * |
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| 91 | * @return ExprBuilder |
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| 92 | */ |
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| 93 | 3 | public function alias($alias) |
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| 99 | |||
| 100 | /** |
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| 101 | * @return ExprBuilder |
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| 102 | */ |
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| 103 | public function sumNullable() |
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| 107 | |||
| 108 | /** |
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| 109 | * @return ExprBuilder |
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| 110 | */ |
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| 111 | 1 | public function in() |
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| 117 | |||
| 118 | /** |
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| 119 | * @return ExprBuilder |
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| 120 | */ |
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| 121 | 1 | public function using() |
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| 125 | |||
| 126 | /** |
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| 127 | * @return ExprBuilder |
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| 128 | */ |
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| 129 | 1 | public function desc() |
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| 133 | |||
| 134 | /** |
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| 135 | * @return ExprBuilder |
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| 136 | */ |
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| 137 | 1 | public function asc() |
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| 141 | |||
| 142 | /** |
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| 143 | * @param string $connector |
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| 144 | * @param mixed $expression |
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| 145 | * |
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| 146 | * @return ExprBuilder |
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| 147 | */ |
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| 148 | 1 | public function conjunction($connector, $expression) |
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| 154 | |||
| 155 | ############################### |
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| 156 | ### COMPARISION EXPRESSIONS ### |
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| 157 | ############################### |
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| 158 | |||
| 159 | /** |
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| 160 | * @param mixed $from |
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| 161 | * @param mixed $to |
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| 162 | * |
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| 163 | * @return ExprBuilder |
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| 164 | */ |
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| 165 | 1 | public function between($from, $to) |
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| 172 | |||
| 173 | /** |
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| 174 | * @param mixed $expression |
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| 175 | * |
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| 176 | * @return ExprBuilder |
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| 177 | */ |
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| 178 | public function eq($expression) |
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| 184 | |||
| 185 | /** |
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| 186 | * @param mixed $expression |
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| 187 | * |
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| 188 | * @return ExprBuilder |
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| 189 | */ |
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| 190 | 1 | public function gt($expression) |
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| 196 | |||
| 197 | /** |
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| 198 | * @param mixed $expression |
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| 199 | * |
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| 200 | * @return ExprBuilder |
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| 201 | */ |
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| 202 | public function gte($expression) |
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| 208 | |||
| 209 | /** |
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| 210 | * @return ExprBuilder |
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| 211 | */ |
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| 212 | public function isNull() |
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| 216 | |||
| 217 | /** |
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| 218 | * @param mixed $expression |
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| 219 | * |
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| 220 | * @return ExprBuilder |
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| 221 | */ |
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| 222 | public function lt($expression) |
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| 228 | |||
| 229 | /** |
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| 230 | * @param mixed $expression |
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| 231 | * |
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| 232 | * @return ExprBuilder |
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| 233 | */ |
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| 234 | public function lte($expression) |
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| 240 | |||
| 241 | /** |
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| 242 | * @param mixed $expression |
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| 243 | * |
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| 244 | * @return ExprBuilder |
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| 245 | */ |
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| 246 | public function neq($expression) |
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| 252 | |||
| 253 | /** |
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| 254 | * @param mixed $from |
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| 255 | * @param mixed $to |
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| 256 | * |
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| 257 | * @return ExprBuilder |
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| 258 | */ |
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| 259 | 1 | public function notBetween($from, $to) |
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| 266 | |||
| 267 | /** |
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| 268 | * @param mixed $expression |
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| 269 | * |
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| 270 | * @return ExprBuilder |
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| 271 | */ |
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| 272 | public function nullEq($expression) |
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| 278 | |||
| 279 | ############################## |
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| 280 | ### ARITHMETIC EXPRESSIONS ### |
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| 281 | ############################## |
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| 282 | |||
| 283 | /** |
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| 284 | * @param mixed $right |
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| 285 | * |
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| 286 | * @return ExprBuilder |
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| 287 | */ |
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| 288 | 1 | public function add($right) |
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| 294 | |||
| 295 | /** |
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| 296 | * @param mixed $right |
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| 297 | * |
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| 298 | * @return ExprBuilder |
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| 299 | */ |
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| 300 | public function div($right) |
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| 306 | |||
| 307 | /** |
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| 308 | * @param mixed $right |
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| 309 | * |
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| 310 | * @return ExprBuilder |
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| 311 | */ |
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| 312 | public function divide($right) |
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| 318 | |||
| 319 | /** |
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| 320 | * @param mixed $right |
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| 321 | * |
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| 322 | * @return ExprBuilder |
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| 323 | */ |
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| 324 | public function modulo($right) |
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| 330 | |||
| 331 | /** |
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| 332 | * @param mixed $right |
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| 333 | * |
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| 334 | * @return ExprBuilder |
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| 335 | */ |
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| 336 | public function multiply($right) |
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| 342 | |||
| 343 | /** |
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| 344 | * @param mixed $right |
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| 345 | * |
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| 346 | * @return ExprBuilder |
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| 347 | */ |
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| 348 | public function subtract($right) |
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| 354 | |||
| 355 | ################# |
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| 356 | ### FUNCTIONS ### |
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| 357 | ################# |
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| 358 | |||
| 359 | /** |
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| 360 | * @return ExprBuilder |
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| 361 | */ |
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| 362 | public function asci() |
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| 366 | |||
| 367 | /** |
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| 368 | * @return ExprBuilder |
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| 369 | */ |
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| 370 | public function bin() |
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| 374 | |||
| 375 | /** |
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| 376 | * @return ExprBuilder |
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| 377 | */ |
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| 378 | public function bitLength() |
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| 382 | |||
| 383 | /** |
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| 384 | * @return ExprBuilder |
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| 385 | */ |
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| 386 | 1 | public function char() |
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| 390 | |||
| 391 | /** |
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| 392 | * @return ExprBuilder |
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| 393 | */ |
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| 394 | 1 | public function coalesce() |
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| 398 | |||
| 399 | /** |
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| 400 | * @return ExprBuilder |
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| 401 | */ |
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| 402 | public function concat() |
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| 406 | |||
| 407 | /** |
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| 408 | * @return ExprBuilder |
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| 409 | */ |
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| 410 | public function concatWs() |
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| 414 | |||
| 415 | /** |
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| 416 | * @return ExprBuilder |
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| 417 | */ |
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| 418 | public function elt() |
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| 422 | |||
| 423 | /** |
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| 424 | * @return ExprBuilder |
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| 425 | */ |
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| 426 | public function exportSet() |
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| 430 | |||
| 431 | /** |
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| 432 | * @return ExprBuilder |
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| 433 | */ |
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| 434 | public function field() |
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| 438 | |||
| 439 | /** |
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| 440 | * @param mixed $expression |
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| 441 | * |
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| 442 | * @return ExprBuilder |
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| 443 | */ |
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| 444 | 1 | public function ifNull($expression) |
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| 450 | |||
| 451 | /** |
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| 452 | * @return ExprBuilder |
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| 453 | */ |
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| 454 | 2 | public function max() |
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| 458 | |||
| 459 | /** |
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| 460 | * @return ExprBuilder |
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| 461 | */ |
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| 462 | 4 | public function sum() |
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| 466 | |||
| 467 | /** |
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| 468 | * @return ExprBuilder |
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| 469 | */ |
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| 470 | 1 | public function year() |
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| 474 | } |