silverstripe /
silverstripe-framework
| Total Complexity | 138 |
| Total Lines | 1238 |
| Duplicated Lines | 0 % |
| Changes | 0 | ||
Complex classes like DataQuery 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.
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 DataQuery, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 21 | class DataQuery |
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| 22 | { |
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| 23 | |||
| 24 | /** |
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| 25 | * @var string |
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| 26 | */ |
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| 27 | protected $dataClass; |
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| 28 | |||
| 29 | /** |
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| 30 | * @var SQLSelect |
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| 31 | */ |
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| 32 | protected $query; |
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| 33 | |||
| 34 | /** |
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| 35 | * Map of all field names to an array of conflicting column SQL |
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| 36 | * |
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| 37 | * E.g. |
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| 38 | * array( |
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| 39 | * 'Title' => array( |
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| 40 | * '"MyTable"."Title"', |
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| 41 | * '"AnotherTable"."Title"', |
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| 42 | * ) |
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| 43 | * ) |
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| 44 | * |
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| 45 | * @var array |
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| 46 | */ |
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| 47 | protected $collidingFields = array(); |
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| 48 | |||
| 49 | /** |
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| 50 | * Allows custom callback to be registered before getFinalisedQuery is called. |
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| 51 | * |
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| 52 | * @var DataQueryManipulator[] |
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| 53 | */ |
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| 54 | protected $dataQueryManipulators = []; |
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| 55 | |||
| 56 | private $queriedColumns = null; |
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| 57 | |||
| 58 | /** |
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| 59 | * @var bool |
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| 60 | */ |
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| 61 | private $queryFinalised = false; |
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|
introduced
by
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| 62 | |||
| 63 | // TODO: replace subclass_access with this |
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| 64 | protected $querySubclasses = true; |
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| 65 | // TODO: replace restrictclasses with this |
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| 66 | protected $filterByClassName = true; |
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| 67 | |||
| 68 | /** |
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| 69 | * Create a new DataQuery. |
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| 70 | * |
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| 71 | * @param string $dataClass The name of the DataObject class that you wish to query |
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| 72 | */ |
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| 73 | public function __construct($dataClass) |
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| 74 | { |
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| 75 | $this->dataClass = $dataClass; |
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| 76 | $this->initialiseQuery(); |
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| 77 | } |
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| 78 | |||
| 79 | /** |
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| 80 | * Clone this object |
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| 81 | */ |
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| 82 | public function __clone() |
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| 83 | { |
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| 84 | $this->query = clone $this->query; |
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| 85 | } |
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| 86 | |||
| 87 | /** |
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| 88 | * Return the {@link DataObject} class that is being queried. |
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| 89 | * |
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| 90 | * @return string |
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| 91 | */ |
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| 92 | public function dataClass() |
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| 93 | { |
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| 94 | return $this->dataClass; |
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| 95 | } |
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| 96 | |||
| 97 | /** |
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| 98 | * Return the {@link SQLSelect} object that represents the current query; note that it will |
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| 99 | * be a clone of the object. |
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| 100 | * |
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| 101 | * @return SQLSelect |
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| 102 | */ |
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| 103 | public function query() |
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| 104 | { |
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| 105 | return $this->getFinalisedQuery(); |
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| 106 | } |
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| 107 | |||
| 108 | |||
| 109 | /** |
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| 110 | * Remove a filter from the query |
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| 111 | * |
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| 112 | * @param string|array $fieldExpression The predicate of the condition to remove |
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| 113 | * (ignoring parameters). The expression will be considered a match if it's |
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| 114 | * contained within any other predicate. |
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| 115 | * @return $this |
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| 116 | */ |
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| 117 | public function removeFilterOn($fieldExpression) |
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| 118 | { |
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| 119 | $matched = false; |
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| 120 | |||
| 121 | // If given a parameterised condition extract only the condition |
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| 122 | if (is_array($fieldExpression)) { |
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| 123 | reset($fieldExpression); |
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| 124 | $fieldExpression = key($fieldExpression); |
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| 125 | } |
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| 126 | |||
| 127 | $where = $this->query->getWhere(); |
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| 128 | // Iterate through each condition |
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| 129 | foreach ($where as $i => $condition) { |
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| 130 | // Rewrite condition groups as plain conditions before comparison |
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| 131 | if ($condition instanceof SQLConditionGroup) { |
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| 132 | $predicate = $condition->conditionSQL($parameters); |
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| 133 | $condition = array($predicate => $parameters); |
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| 134 | } |
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| 135 | |||
| 136 | // As each condition is a single length array, do a single |
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| 137 | // iteration to extract the predicate and parameters |
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| 138 | foreach ($condition as $predicate => $parameters) { |
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| 139 | // @see SQLSelect::addWhere for why this is required here |
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| 140 | if (strpos($predicate, $fieldExpression) !== false) { |
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| 141 | unset($where[$i]); |
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| 142 | $matched = true; |
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| 143 | } |
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| 144 | // Enforce single-item condition predicate => parameters structure |
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| 145 | break; |
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| 146 | } |
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| 147 | } |
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| 148 | |||
| 149 | // set the entire where clause back, but clear the original one first |
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| 150 | if ($matched) { |
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| 151 | $this->query->setWhere($where); |
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| 152 | } else { |
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| 153 | throw new InvalidArgumentException("Couldn't find $fieldExpression in the query filter."); |
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| 154 | } |
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| 155 | |||
| 156 | return $this; |
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| 157 | } |
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| 158 | |||
| 159 | /** |
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| 160 | * Set up the simplest initial query |
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| 161 | */ |
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| 162 | protected function initialiseQuery() |
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| 163 | { |
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| 164 | // Join on base table and let lazy loading join subtables |
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| 165 | $baseClass = DataObject::getSchema()->baseDataClass($this->dataClass()); |
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| 166 | if (!$baseClass) { |
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| 167 | throw new InvalidArgumentException("DataQuery::create() Can't find data classes for '{$this->dataClass}'"); |
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| 168 | } |
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| 169 | |||
| 170 | // Build our intial query |
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| 171 | $this->query = new SQLSelect(array()); |
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| 172 | $this->query->setDistinct(true); |
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| 173 | |||
| 174 | if ($sort = singleton($this->dataClass)->config()->get('default_sort')) { |
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| 175 | $this->sort($sort); |
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| 176 | } |
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| 177 | |||
| 178 | $baseTable = DataObject::getSchema()->tableName($baseClass); |
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| 179 | $this->query->setFrom("\"{$baseTable}\""); |
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| 180 | |||
| 181 | $obj = Injector::inst()->get($baseClass); |
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| 182 | $obj->extend('augmentDataQueryCreation', $this->query, $this); |
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| 183 | } |
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| 184 | |||
| 185 | /** |
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| 186 | * @param array $queriedColumns |
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| 187 | * @return $this |
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| 188 | */ |
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| 189 | public function setQueriedColumns($queriedColumns) |
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| 193 | } |
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| 194 | |||
| 195 | /** |
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| 196 | * Ensure that the query is ready to execute. |
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| 197 | * |
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| 198 | * @param array|null $queriedColumns Any columns to filter the query by |
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| 199 | * @return SQLSelect The finalised sql query |
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| 200 | */ |
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| 201 | public function getFinalisedQuery($queriedColumns = null) |
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| 345 | } |
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| 346 | |||
| 347 | /** |
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| 348 | * Ensure that if a query has an order by clause, those columns are present in the select. |
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| 349 | * |
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| 350 | * @param SQLSelect $query |
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| 351 | * @param array $originalSelect |
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| 352 | */ |
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| 353 | protected function ensureSelectContainsOrderbyColumns($query, $originalSelect = array()) |
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| 354 | { |
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| 355 | if ($orderby = $query->getOrderBy()) { |
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| 356 | $newOrderby = array(); |
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| 357 | foreach ($orderby as $k => $dir) { |
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| 358 | $newOrderby[$k] = $dir; |
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| 359 | |||
| 360 | // don't touch functions in the ORDER BY or public function calls |
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| 361 | // selected as fields |
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| 362 | if (strpos($k, '(') !== false) { |
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| 363 | continue; |
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| 364 | } |
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| 365 | |||
| 366 | $col = str_replace('"', '', trim($k)); |
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| 367 | $parts = explode('.', $col); |
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| 368 | |||
| 369 | // Pull through SortColumn references from the originalSelect variables |
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| 370 | if (preg_match('/_SortColumn/', $col)) { |
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| 371 | if (isset($originalSelect[$col])) { |
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| 372 | $query->selectField($originalSelect[$col], $col); |
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| 373 | } |
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| 374 | continue; |
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| 375 | } |
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| 376 | |||
| 377 | if (count($parts) == 1) { |
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| 378 | // Get expression for sort value |
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| 379 | $qualCol = "\"{$parts[0]}\""; |
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| 380 | $table = DataObject::getSchema()->tableForField($this->dataClass(), $parts[0]); |
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| 381 | if ($table) { |
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| 382 | $qualCol = "\"{$table}\".{$qualCol}"; |
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| 383 | } |
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| 384 | |||
| 385 | // remove original sort |
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| 386 | unset($newOrderby[$k]); |
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| 387 | |||
| 388 | // add new columns sort |
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| 389 | $newOrderby[$qualCol] = $dir; |
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| 390 | |||
| 391 | // To-do: Remove this if block once SQLSelect::$select has been refactored to store getSelect() |
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| 392 | // format internally; then this check can be part of selectField() |
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| 393 | $selects = $query->getSelect(); |
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| 394 | if (!isset($selects[$col]) && !in_array($qualCol, $selects)) { |
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| 395 | $query->selectField($qualCol); |
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| 396 | } |
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| 397 | } else { |
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| 398 | $qualCol = '"' . implode('"."', $parts) . '"'; |
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| 399 | |||
| 400 | if (!in_array($qualCol, $query->getSelect())) { |
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| 401 | unset($newOrderby[$k]); |
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| 402 | |||
| 403 | // Find the first free "_SortColumnX" slot |
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| 404 | // and assign it to $key |
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| 405 | $i = 0; |
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| 406 | while (isset($orderby[$key = "\"_SortColumn$i\""])) { |
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| 407 | ++$i; |
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| 408 | } |
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| 409 | |||
| 410 | $newOrderby[$key] = $dir; |
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| 411 | $query->selectField($qualCol, "_SortColumn$i"); |
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| 412 | } |
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| 413 | } |
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| 414 | } |
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| 415 | |||
| 416 | $query->setOrderBy($newOrderby); |
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| 417 | } |
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| 418 | } |
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| 419 | |||
| 420 | /** |
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| 421 | * Execute the query and return the result as {@link SS_Query} object. |
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| 422 | * |
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| 423 | * @return Query |
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| 424 | */ |
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| 425 | public function execute() |
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| 426 | { |
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| 427 | return $this->getFinalisedQuery()->execute(); |
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| 428 | } |
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| 429 | |||
| 430 | /** |
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| 431 | * Return this query's SQL |
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| 432 | * |
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| 433 | * @param array $parameters Out variable for parameters required for this query |
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| 434 | * @return string The resulting SQL query (may be paramaterised) |
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| 435 | */ |
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| 436 | public function sql(&$parameters = array()) |
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| 437 | { |
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| 438 | return $this->getFinalisedQuery()->sql($parameters); |
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| 439 | } |
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| 440 | |||
| 441 | /** |
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| 442 | * Return the number of records in this query. |
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| 443 | * Note that this will issue a separate SELECT COUNT() query. |
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| 444 | * |
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| 445 | * @return int |
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| 446 | */ |
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| 447 | public function count() |
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| 448 | { |
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| 449 | $quotedColumn = DataObject::getSchema()->sqlColumnForField($this->dataClass(), 'ID'); |
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| 450 | return $this->getFinalisedQuery()->count("DISTINCT {$quotedColumn}"); |
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| 451 | } |
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| 452 | |||
| 453 | /** |
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| 454 | * Return the maximum value of the given field in this DataList |
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| 455 | * |
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| 456 | * @param string $field Unquoted database column name. Will be ANSI quoted |
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| 457 | * automatically so must not contain double quotes. |
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| 458 | * @return string |
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| 459 | */ |
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| 460 | public function max($field) |
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| 461 | { |
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| 462 | $table = DataObject::getSchema()->tableForField($this->dataClass, $field); |
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| 463 | if (!$table) { |
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| 464 | return $this->aggregate("MAX(\"$field\")"); |
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| 465 | } |
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| 466 | return $this->aggregate("MAX(\"$table\".\"$field\")"); |
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| 467 | } |
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| 468 | |||
| 469 | /** |
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| 470 | * Return the minimum value of the given field in this DataList |
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| 471 | * |
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| 472 | * @param string $field Unquoted database column name. Will be ANSI quoted |
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| 473 | * automatically so must not contain double quotes. |
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| 474 | * @return string |
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| 475 | */ |
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| 476 | public function min($field) |
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| 477 | { |
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| 478 | $table = DataObject::getSchema()->tableForField($this->dataClass, $field); |
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| 479 | if (!$table) { |
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| 480 | return $this->aggregate("MIN(\"$field\")"); |
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| 481 | } |
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| 482 | return $this->aggregate("MIN(\"$table\".\"$field\")"); |
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| 483 | } |
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| 484 | |||
| 485 | /** |
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| 486 | * Return the average value of the given field in this DataList |
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| 487 | * |
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| 488 | * @param string $field Unquoted database column name. Will be ANSI quoted |
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| 489 | * automatically so must not contain double quotes. |
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| 490 | * @return string |
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| 491 | */ |
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| 492 | public function avg($field) |
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| 493 | { |
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| 494 | $table = DataObject::getSchema()->tableForField($this->dataClass, $field); |
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| 495 | if (!$table) { |
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| 496 | return $this->aggregate("AVG(\"$field\")"); |
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| 497 | } |
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| 498 | return $this->aggregate("AVG(\"$table\".\"$field\")"); |
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| 499 | } |
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| 500 | |||
| 501 | /** |
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| 502 | * Return the sum of the values of the given field in this DataList |
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| 503 | * |
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| 504 | * @param string $field Unquoted database column name. Will be ANSI quoted |
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| 505 | * automatically so must not contain double quotes. |
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| 506 | * @return string |
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| 507 | */ |
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| 508 | public function sum($field) |
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| 509 | { |
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| 510 | $table = DataObject::getSchema()->tableForField($this->dataClass, $field); |
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| 511 | if (!$table) { |
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| 512 | return $this->aggregate("SUM(\"$field\")"); |
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| 513 | } |
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| 514 | return $this->aggregate("SUM(\"$table\".\"$field\")"); |
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| 515 | } |
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| 516 | |||
| 517 | /** |
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| 518 | * Runs a raw aggregate expression. Please handle escaping yourself |
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| 519 | * |
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| 520 | * @param string $expression An aggregate expression, such as 'MAX("Balance")', or a set of them |
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| 521 | * (as an escaped SQL statement) |
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| 522 | * @return string |
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| 523 | */ |
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| 524 | public function aggregate($expression) |
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| 525 | { |
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| 526 | return $this->getFinalisedQuery()->aggregate($expression)->execute()->value(); |
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| 527 | } |
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| 528 | |||
| 529 | /** |
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| 530 | * Return the first row that would be returned by this full DataQuery |
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| 531 | * Note that this will issue a separate SELECT ... LIMIT 1 query. |
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| 532 | * |
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| 533 | * @return SQLSelect |
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| 534 | */ |
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| 535 | public function firstRow() |
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| 536 | { |
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| 537 | return $this->getFinalisedQuery()->firstRow(); |
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| 538 | } |
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| 539 | |||
| 540 | /** |
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| 541 | * Return the last row that would be returned by this full DataQuery |
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| 542 | * Note that this will issue a separate SELECT ... LIMIT query. |
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| 543 | * |
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| 544 | * @return SQLSelect |
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| 545 | */ |
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| 546 | public function lastRow() |
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| 547 | { |
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| 548 | return $this->getFinalisedQuery()->lastRow(); |
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| 549 | } |
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| 550 | |||
| 551 | /** |
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| 552 | * Update the SELECT clause of the query with the columns from the given table |
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| 553 | * |
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| 554 | * @param SQLSelect $query |
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| 555 | * @param string $tableClass Class to select from |
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| 556 | * @param array $columns |
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| 557 | */ |
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| 558 | protected function selectColumnsFromTable(SQLSelect &$query, $tableClass, $columns = null) |
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| 559 | { |
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| 560 | // Add SQL for multi-value fields |
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| 561 | $schema = DataObject::getSchema(); |
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| 562 | $databaseFields = $schema->databaseFields($tableClass, false); |
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| 563 | $compositeFields = $schema->compositeFields($tableClass, false); |
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| 564 | unset($databaseFields['ID']); |
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| 565 | foreach ($databaseFields as $k => $v) { |
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| 566 | if ((is_null($columns) || in_array($k, $columns)) && !isset($compositeFields[$k])) { |
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| 567 | // Update $collidingFields if necessary |
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| 568 | $expressionForField = $query->expressionForField($k); |
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| 569 | $quotedField = $schema->sqlColumnForField($tableClass, $k); |
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| 570 | if ($expressionForField) { |
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| 571 | if (!isset($this->collidingFields[$k])) { |
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| 572 | $this->collidingFields[$k] = array($expressionForField); |
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| 573 | } |
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| 574 | $this->collidingFields[$k][] = $quotedField; |
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| 575 | } else { |
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| 576 | $query->selectField($quotedField, $k); |
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| 577 | } |
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| 578 | } |
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| 579 | } |
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| 580 | foreach ($compositeFields as $k => $v) { |
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| 581 | if ((is_null($columns) || in_array($k, $columns)) && $v) { |
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| 582 | $tableName = $schema->tableName($tableClass); |
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| 583 | $dbO = Injector::inst()->create($v, $k); |
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| 584 | $dbO->setTable($tableName); |
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| 585 | $dbO->addToQuery($query); |
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| 586 | } |
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| 587 | } |
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| 588 | } |
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| 589 | |||
| 590 | /** |
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| 591 | * Append a GROUP BY clause to this query. |
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| 592 | * |
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| 593 | * @param string $groupby Escaped SQL statement |
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| 594 | * @return $this |
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| 595 | */ |
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| 596 | public function groupby($groupby) |
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| 597 | { |
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| 598 | $this->query->addGroupBy($groupby); |
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| 599 | return $this; |
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| 600 | } |
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| 601 | |||
| 602 | /** |
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| 603 | * Append a HAVING clause to this query. |
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| 604 | * |
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| 605 | * @param mixed $having Predicate(s) to set, as escaped SQL statements or parameterised queries |
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| 606 | * @return $this |
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| 607 | */ |
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| 608 | public function having($having) |
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| 609 | { |
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| 610 | $this->query->addHaving($having); |
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| 611 | return $this; |
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| 612 | } |
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| 613 | |||
| 614 | /** |
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| 615 | * Create a disjunctive subgroup. |
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| 616 | * |
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| 617 | * That is a subgroup joined by OR |
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| 618 | * |
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| 619 | * @return DataQuery_SubGroup |
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| 620 | */ |
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| 621 | public function disjunctiveGroup() |
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| 622 | { |
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| 623 | return new DataQuery_SubGroup($this, 'OR'); |
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| 624 | } |
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| 625 | |||
| 626 | /** |
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| 627 | * Create a conjunctive subgroup |
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| 628 | * |
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| 629 | * That is a subgroup joined by AND |
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| 630 | * |
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| 631 | * @return DataQuery_SubGroup |
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| 632 | */ |
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| 633 | public function conjunctiveGroup() |
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| 634 | { |
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| 635 | return new DataQuery_SubGroup($this, 'AND'); |
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| 636 | } |
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| 637 | |||
| 638 | /** |
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| 639 | * Adds a WHERE clause. |
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| 640 | * |
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| 641 | * @see SQLSelect::addWhere() for syntax examples, although DataQuery |
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| 642 | * won't expand multiple arguments as SQLSelect does. |
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| 643 | * |
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| 644 | * @param string|array|SQLConditionGroup $filter Predicate(s) to set, as escaped SQL statements or |
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| 645 | * paramaterised queries |
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| 646 | * @return $this |
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| 647 | */ |
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| 648 | public function where($filter) |
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| 649 | { |
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| 650 | if ($filter) { |
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| 651 | $this->query->addWhere($filter); |
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| 652 | } |
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| 653 | return $this; |
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| 654 | } |
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| 655 | |||
| 656 | /** |
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| 657 | * Append a WHERE with OR. |
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| 658 | * |
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| 659 | * @see SQLSelect::addWhere() for syntax examples, although DataQuery |
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| 660 | * won't expand multiple method arguments as SQLSelect does. |
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| 661 | * |
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| 662 | * @param string|array|SQLConditionGroup $filter Predicate(s) to set, as escaped SQL statements or |
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| 663 | * paramaterised queries |
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| 664 | * @return $this |
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| 665 | */ |
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| 666 | public function whereAny($filter) |
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| 667 | { |
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| 668 | if ($filter) { |
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| 669 | $this->query->addWhereAny($filter); |
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| 670 | } |
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| 671 | return $this; |
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| 672 | } |
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| 673 | |||
| 674 | /** |
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| 675 | * Set the ORDER BY clause of this query |
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| 676 | * |
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| 677 | * @see SQLSelect::orderby() |
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| 678 | * |
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| 679 | * @param string $sort Column to sort on (escaped SQL statement) |
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| 680 | * @param string $direction Direction ("ASC" or "DESC", escaped SQL statement) |
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| 681 | * @param bool $clear Clear existing values |
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| 682 | * @return $this |
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| 683 | */ |
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| 684 | public function sort($sort = null, $direction = null, $clear = true) |
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| 685 | { |
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| 686 | if ($clear) { |
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| 687 | $this->query->setOrderBy($sort, $direction); |
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| 688 | } else { |
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| 689 | $this->query->addOrderBy($sort, $direction); |
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| 690 | } |
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| 691 | |||
| 692 | return $this; |
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| 693 | } |
||
| 694 | |||
| 695 | /** |
||
| 696 | * Reverse order by clause |
||
| 697 | * |
||
| 698 | * @return $this |
||
| 699 | */ |
||
| 700 | public function reverseSort() |
||
| 701 | { |
||
| 702 | $this->query->reverseOrderBy(); |
||
| 703 | return $this; |
||
| 704 | } |
||
| 705 | |||
| 706 | /** |
||
| 707 | * Set the limit of this query. |
||
| 708 | * |
||
| 709 | * @param int $limit |
||
| 710 | * @param int $offset |
||
| 711 | * @return $this |
||
| 712 | */ |
||
| 713 | public function limit($limit, $offset = 0) |
||
| 714 | { |
||
| 715 | $this->query->setLimit($limit, $offset); |
||
| 716 | return $this; |
||
| 717 | } |
||
| 718 | |||
| 719 | /** |
||
| 720 | * Set whether this query should be distinct or not. |
||
| 721 | * |
||
| 722 | * @param bool $value |
||
| 723 | * @return $this |
||
| 724 | */ |
||
| 725 | public function distinct($value) |
||
| 726 | { |
||
| 727 | $this->query->setDistinct($value); |
||
| 728 | return $this; |
||
| 729 | } |
||
| 730 | |||
| 731 | /** |
||
| 732 | * Add an INNER JOIN clause to this query. |
||
| 733 | * |
||
| 734 | * @param string $table The unquoted table name to join to. |
||
| 735 | * @param string $onClause The filter for the join (escaped SQL statement) |
||
| 736 | * @param string $alias An optional alias name (unquoted) |
||
| 737 | * @param int $order A numerical index to control the order that joins are added to the query; lower order values |
||
| 738 | * will cause the query to appear first. The default is 20, and joins created automatically by the |
||
| 739 | * ORM have a value of 10. |
||
| 740 | * @param array $parameters Any additional parameters if the join is a parameterised subquery |
||
| 741 | * @return $this |
||
| 742 | */ |
||
| 743 | public function innerJoin($table, $onClause, $alias = null, $order = 20, $parameters = array()) |
||
| 744 | { |
||
| 745 | if ($table) { |
||
| 746 | $this->query->addInnerJoin($table, $onClause, $alias, $order, $parameters); |
||
| 747 | } |
||
| 748 | return $this; |
||
| 749 | } |
||
| 750 | |||
| 751 | /** |
||
| 752 | * Add a LEFT JOIN clause to this query. |
||
| 753 | * |
||
| 754 | * @param string $table The unquoted table to join to. |
||
| 755 | * @param string $onClause The filter for the join (escaped SQL statement). |
||
| 756 | * @param string $alias An optional alias name (unquoted) |
||
| 757 | * @param int $order A numerical index to control the order that joins are added to the query; lower order values |
||
| 758 | * will cause the query to appear first. The default is 20, and joins created automatically by the |
||
| 759 | * ORM have a value of 10. |
||
| 760 | * @param array $parameters Any additional parameters if the join is a parameterised subquery |
||
| 761 | * @return $this |
||
| 762 | */ |
||
| 763 | public function leftJoin($table, $onClause, $alias = null, $order = 20, $parameters = array()) |
||
| 764 | { |
||
| 765 | if ($table) { |
||
| 766 | $this->query->addLeftJoin($table, $onClause, $alias, $order, $parameters); |
||
| 767 | } |
||
| 768 | return $this; |
||
| 769 | } |
||
| 770 | |||
| 771 | /** |
||
| 772 | * Prefix of all joined table aliases. E.g. ->filter('Banner.Image.Title)' |
||
| 773 | * Will join the Banner, and then Image relations |
||
| 774 | * `$relationPrefx` will be `banner_image_` |
||
| 775 | * Each table in the Image chain will be suffixed to this prefix. E.g. |
||
| 776 | * `banner_image_File` and `banner_image_Image` |
||
| 777 | * |
||
| 778 | * This will be null if no relation is joined. |
||
| 779 | * E.g. `->filter('Title')` |
||
| 780 | * |
||
| 781 | * @param string|array $relation Relation in '.' delimited string, or array of parts |
||
| 782 | * @return string Table prefix |
||
| 783 | */ |
||
| 784 | public static function applyRelationPrefix($relation) |
||
| 785 | { |
||
| 786 | if (!$relation) { |
||
| 787 | return null; |
||
| 788 | } |
||
| 789 | if (is_string($relation)) { |
||
| 790 | $relation = explode(".", $relation); |
||
| 791 | } |
||
| 792 | return strtolower(implode('_', $relation)) . '_'; |
||
| 793 | } |
||
| 794 | |||
| 795 | /** |
||
| 796 | * Traverse the relationship fields, and add the table |
||
| 797 | * mappings to the query object state. This has to be called |
||
| 798 | * in any overloaded {@link SearchFilter->apply()} methods manually. |
||
| 799 | * |
||
| 800 | * Note, that in order to filter against the joined relation user code must |
||
| 801 | * use {@see tablePrefix()} to get the table alias used for this relation. |
||
| 802 | * |
||
| 803 | * @param string|array $relation The array/dot-syntax relation to follow |
||
| 804 | * @param bool $linearOnly Set to true to restrict to linear relations only. Set this |
||
| 805 | * if this relation will be used for sorting, and should not include duplicate rows. |
||
| 806 | * @return string The model class of the related item |
||
| 807 | */ |
||
| 808 | public function applyRelation($relation, $linearOnly = false) |
||
| 809 | { |
||
| 810 | // NO-OP |
||
| 811 | if (!$relation) { |
||
| 812 | return $this->dataClass; |
||
| 813 | } |
||
| 814 | |||
| 815 | if (is_string($relation)) { |
||
| 816 | $relation = explode(".", $relation); |
||
| 817 | } |
||
| 818 | |||
| 819 | $modelClass = $this->dataClass; |
||
| 820 | |||
| 821 | $schema = DataObject::getSchema(); |
||
| 822 | $currentRelation = []; |
||
| 823 | foreach ($relation as $rel) { |
||
| 824 | // Get prefix for join for this table (and parent to join on) |
||
| 825 | $parentPrefix = $this->applyRelationPrefix($currentRelation); |
||
| 826 | $currentRelation[] = $rel; |
||
| 827 | $tablePrefix = $this->applyRelationPrefix($currentRelation); |
||
| 828 | |||
| 829 | // Check has_one |
||
| 830 | if ($component = $schema->hasOneComponent($modelClass, $rel)) { |
||
| 831 | // Join via has_one |
||
| 832 | $this->joinHasOneRelation($modelClass, $rel, $component, $parentPrefix, $tablePrefix); |
||
| 833 | $modelClass = $component; |
||
| 834 | continue; |
||
| 835 | } |
||
| 836 | |||
| 837 | // Check has_many |
||
| 838 | if ($component = $schema->hasManyComponent($modelClass, $rel)) { |
||
| 839 | // Fail on non-linear relations |
||
| 840 | if ($linearOnly) { |
||
| 841 | throw new InvalidArgumentException("$rel is not a linear relation on model $modelClass"); |
||
| 842 | } |
||
| 843 | // Join via has_many |
||
| 844 | $this->joinHasManyRelation($modelClass, $rel, $component, $parentPrefix, $tablePrefix, 'has_many'); |
||
| 845 | $modelClass = $component; |
||
| 846 | continue; |
||
| 847 | } |
||
| 848 | |||
| 849 | // check belongs_to (like has_many but linear safe) |
||
| 850 | if ($component = $schema->belongsToComponent($modelClass, $rel)) { |
||
| 851 | // Piggy back off has_many logic |
||
| 852 | $this->joinHasManyRelation($modelClass, $rel, $component, $parentPrefix, $tablePrefix, 'belongs_to'); |
||
| 853 | $modelClass = $component; |
||
| 854 | continue; |
||
| 855 | } |
||
| 856 | |||
| 857 | // Check many_many |
||
| 858 | if ($component = $schema->manyManyComponent($modelClass, $rel)) { |
||
| 859 | // Fail on non-linear relations |
||
| 860 | if ($linearOnly) { |
||
| 861 | throw new InvalidArgumentException("$rel is not a linear relation on model $modelClass"); |
||
| 862 | } |
||
| 863 | $this->joinManyManyRelationship( |
||
| 864 | $component['relationClass'], |
||
| 865 | $component['parentClass'], |
||
| 866 | $component['childClass'], |
||
| 867 | $component['parentField'], |
||
| 868 | $component['childField'], |
||
| 869 | $component['join'], |
||
| 870 | $parentPrefix, |
||
| 871 | $tablePrefix |
||
| 872 | ); |
||
| 873 | $modelClass = $component['childClass']; |
||
| 874 | continue; |
||
| 875 | } |
||
| 876 | |||
| 877 | // no relation |
||
| 878 | throw new InvalidArgumentException("$rel is not a relation on model $modelClass"); |
||
| 879 | } |
||
| 880 | |||
| 881 | return $modelClass; |
||
| 882 | } |
||
| 883 | |||
| 884 | /** |
||
| 885 | * Join the given has_many relation to this query. |
||
| 886 | * Also works with belongs_to |
||
| 887 | * |
||
| 888 | * Doesn't work with polymorphic relationships |
||
| 889 | * |
||
| 890 | * @param string $localClass Name of class that has the has_many to the joined class |
||
| 891 | * @param string $localField Name of the has_many relationship to join |
||
| 892 | * @param string $foreignClass Class to join |
||
| 893 | * @param string $localPrefix Table prefix for parent class |
||
| 894 | * @param string $foreignPrefix Table prefix to use |
||
| 895 | * @param string $type 'has_many' or 'belongs_to' |
||
| 896 | */ |
||
| 897 | protected function joinHasManyRelation( |
||
| 898 | $localClass, |
||
| 899 | $localField, |
||
| 900 | $foreignClass, |
||
| 901 | $localPrefix = null, |
||
| 902 | $foreignPrefix = null, |
||
| 903 | $type = 'has_many' |
||
| 904 | ) { |
||
| 905 | if (!$foreignClass || $foreignClass === DataObject::class) { |
||
| 906 | throw new InvalidArgumentException("Could not find a has_many relationship {$localField} on {$localClass}"); |
||
| 907 | } |
||
| 908 | $schema = DataObject::getSchema(); |
||
| 909 | |||
| 910 | // Skip if already joined |
||
| 911 | // Note: don't just check base class, since we need to join on the table with the actual relation key |
||
| 912 | $foreignTable = $schema->tableName($foreignClass); |
||
| 913 | $foreignTableAliased = $foreignPrefix . $foreignTable; |
||
| 914 | if ($this->query->isJoinedTo($foreignTableAliased)) { |
||
| 915 | return; |
||
| 916 | } |
||
| 917 | |||
| 918 | // Join table with associated has_one |
||
| 919 | /** @var DataObject $model */ |
||
| 920 | $foreignKey = $schema->getRemoteJoinField($localClass, $localField, $type, $polymorphic); |
||
| 921 | $localIDColumn = $schema->sqlColumnForField($localClass, 'ID', $localPrefix); |
||
| 922 | if ($polymorphic) { |
||
| 923 | $foreignKeyIDColumn = $schema->sqlColumnForField($foreignClass, "{$foreignKey}ID", $foreignPrefix); |
||
| 924 | $foreignKeyClassColumn = $schema->sqlColumnForField($foreignClass, "{$foreignKey}Class", $foreignPrefix); |
||
| 925 | $localClassColumn = $schema->sqlColumnForField($localClass, 'ClassName', $localPrefix); |
||
| 926 | $joinExpression = |
||
| 927 | "{$foreignKeyIDColumn} = {$localIDColumn} AND {$foreignKeyClassColumn} = {$localClassColumn}"; |
||
| 928 | } else { |
||
| 929 | $foreignKeyIDColumn = $schema->sqlColumnForField($foreignClass, $foreignKey, $foreignPrefix); |
||
| 930 | $joinExpression = "{$foreignKeyIDColumn} = {$localIDColumn}"; |
||
| 931 | } |
||
| 932 | $this->query->addLeftJoin( |
||
| 933 | $foreignTable, |
||
| 934 | $joinExpression, |
||
| 935 | $foreignTableAliased |
||
| 936 | ); |
||
| 937 | |||
| 938 | // Add join clause to the component's ancestry classes so that the search filter could search on |
||
| 939 | // its ancestor fields. |
||
| 940 | $ancestry = ClassInfo::ancestry($foreignClass, true); |
||
| 941 | $ancestry = array_reverse($ancestry); |
||
| 942 | foreach ($ancestry as $ancestor) { |
||
| 943 | $ancestorTable = $schema->tableName($ancestor); |
||
| 944 | if ($ancestorTable !== $foreignTable) { |
||
| 945 | $ancestorTableAliased = $foreignPrefix . $ancestorTable; |
||
| 946 | $this->query->addLeftJoin( |
||
| 947 | $ancestorTable, |
||
| 948 | "\"{$foreignTableAliased}\".\"ID\" = \"{$ancestorTableAliased}\".\"ID\"", |
||
| 949 | $ancestorTableAliased |
||
| 950 | ); |
||
| 951 | } |
||
| 952 | } |
||
| 953 | } |
||
| 954 | |||
| 955 | /** |
||
| 956 | * Join the given class to this query with the given key |
||
| 957 | * |
||
| 958 | * @param string $localClass Name of class that has the has_one to the joined class |
||
| 959 | * @param string $localField Name of the has_one relationship to joi |
||
| 960 | * @param string $foreignClass Class to join |
||
| 961 | * @param string $localPrefix Table prefix to use for local class |
||
| 962 | * @param string $foreignPrefix Table prefix to use for joined table |
||
| 963 | */ |
||
| 964 | protected function joinHasOneRelation( |
||
| 965 | $localClass, |
||
| 966 | $localField, |
||
| 967 | $foreignClass, |
||
| 968 | $localPrefix = null, |
||
| 969 | $foreignPrefix = null |
||
| 970 | ) { |
||
| 971 | if (!$foreignClass) { |
||
| 972 | throw new InvalidArgumentException("Could not find a has_one relationship {$localField} on {$localClass}"); |
||
| 973 | } |
||
| 974 | |||
| 975 | if ($foreignClass === DataObject::class) { |
||
| 976 | throw new InvalidArgumentException( |
||
| 977 | "Could not join polymorphic has_one relationship {$localField} on {$localClass}" |
||
| 978 | ); |
||
| 979 | } |
||
| 980 | $schema = DataObject::getSchema(); |
||
| 981 | |||
| 982 | // Skip if already joined |
||
| 983 | $foreignBaseClass = $schema->baseDataClass($foreignClass); |
||
| 984 | $foreignBaseTable = $schema->tableName($foreignBaseClass); |
||
| 985 | if ($this->query->isJoinedTo($foreignPrefix . $foreignBaseTable)) { |
||
| 986 | return; |
||
| 987 | } |
||
| 988 | |||
| 989 | // Join base table |
||
| 990 | $foreignIDColumn = $schema->sqlColumnForField($foreignBaseClass, 'ID', $foreignPrefix); |
||
| 991 | $localColumn = $schema->sqlColumnForField($localClass, "{$localField}ID", $localPrefix); |
||
| 992 | $this->query->addLeftJoin( |
||
| 993 | $foreignBaseTable, |
||
| 994 | "{$foreignIDColumn} = {$localColumn}", |
||
| 995 | $foreignPrefix . $foreignBaseTable |
||
| 996 | ); |
||
| 997 | |||
| 998 | // Add join clause to the component's ancestry classes so that the search filter could search on |
||
| 999 | // its ancestor fields. |
||
| 1000 | $ancestry = ClassInfo::ancestry($foreignClass, true); |
||
| 1001 | if (!empty($ancestry)) { |
||
| 1002 | $ancestry = array_reverse($ancestry); |
||
| 1003 | foreach ($ancestry as $ancestor) { |
||
| 1004 | $ancestorTable = $schema->tableName($ancestor); |
||
| 1005 | if ($ancestorTable !== $foreignBaseTable) { |
||
| 1006 | $ancestorTableAliased = $foreignPrefix . $ancestorTable; |
||
| 1007 | $this->query->addLeftJoin( |
||
| 1008 | $ancestorTable, |
||
| 1009 | "{$foreignIDColumn} = \"{$ancestorTableAliased}\".\"ID\"", |
||
| 1010 | $ancestorTableAliased |
||
| 1011 | ); |
||
| 1012 | } |
||
| 1013 | } |
||
| 1014 | } |
||
| 1015 | } |
||
| 1016 | |||
| 1017 | /** |
||
| 1018 | * Join table via many_many relationship |
||
| 1019 | * |
||
| 1020 | * @param string $relationClass |
||
| 1021 | * @param string $parentClass |
||
| 1022 | * @param string $componentClass |
||
| 1023 | * @param string $parentField |
||
| 1024 | * @param string $componentField |
||
| 1025 | * @param string $relationClassOrTable Name of relation table |
||
| 1026 | * @param string $parentPrefix Table prefix for parent class |
||
| 1027 | * @param string $componentPrefix Table prefix to use for both joined and mapping table |
||
| 1028 | */ |
||
| 1029 | protected function joinManyManyRelationship( |
||
| 1030 | $relationClass, |
||
| 1031 | $parentClass, |
||
| 1032 | $componentClass, |
||
| 1033 | $parentField, |
||
| 1034 | $componentField, |
||
| 1035 | $relationClassOrTable, |
||
| 1036 | $parentPrefix = null, |
||
| 1037 | $componentPrefix = null |
||
| 1038 | ) { |
||
| 1039 | $schema = DataObject::getSchema(); |
||
| 1040 | |||
| 1041 | if (class_exists($relationClassOrTable)) { |
||
| 1042 | $relationClassOrTable = $schema->tableName($relationClassOrTable); |
||
| 1043 | } |
||
| 1044 | |||
| 1045 | // Check if already joined to component alias (skip join table for the check) |
||
| 1046 | $componentBaseClass = $schema->baseDataClass($componentClass); |
||
| 1047 | $componentBaseTable = $schema->tableName($componentBaseClass); |
||
| 1048 | $componentAliasedTable = $componentPrefix . $componentBaseTable; |
||
| 1049 | if ($this->query->isJoinedTo($componentAliasedTable)) { |
||
| 1050 | return; |
||
| 1051 | } |
||
| 1052 | |||
| 1053 | // Join parent class to join table |
||
| 1054 | $relationAliasedTable = $componentPrefix . $relationClassOrTable; |
||
| 1055 | $parentIDColumn = $schema->sqlColumnForField($parentClass, 'ID', $parentPrefix); |
||
| 1056 | $this->query->addLeftJoin( |
||
| 1057 | $relationClassOrTable, |
||
| 1058 | "\"{$relationAliasedTable}\".\"{$parentField}\" = {$parentIDColumn}", |
||
| 1059 | $relationAliasedTable |
||
| 1060 | ); |
||
| 1061 | |||
| 1062 | // Join on base table of component class |
||
| 1063 | $componentIDColumn = $schema->sqlColumnForField($componentBaseClass, 'ID', $componentPrefix); |
||
| 1064 | $this->query->addLeftJoin( |
||
| 1065 | $componentBaseTable, |
||
| 1066 | "\"{$relationAliasedTable}\".\"{$componentField}\" = {$componentIDColumn}", |
||
| 1067 | $componentAliasedTable |
||
| 1068 | ); |
||
| 1069 | |||
| 1070 | // Add join clause to the component's ancestry classes so that the search filter could search on |
||
| 1071 | // its ancestor fields. |
||
| 1072 | $ancestry = ClassInfo::ancestry($componentClass, true); |
||
| 1073 | $ancestry = array_reverse($ancestry); |
||
| 1074 | foreach ($ancestry as $ancestor) { |
||
| 1075 | $ancestorTable = $schema->tableName($ancestor); |
||
| 1076 | if ($ancestorTable !== $componentBaseTable) { |
||
| 1077 | $ancestorTableAliased = $componentPrefix . $ancestorTable; |
||
| 1078 | $this->query->addLeftJoin( |
||
| 1079 | $ancestorTable, |
||
| 1080 | "{$componentIDColumn} = \"{$ancestorTableAliased}\".\"ID\"", |
||
| 1081 | $ancestorTableAliased |
||
| 1082 | ); |
||
| 1083 | } |
||
| 1084 | } |
||
| 1085 | } |
||
| 1086 | |||
| 1087 | /** |
||
| 1088 | * Removes the result of query from this query. |
||
| 1089 | * |
||
| 1090 | * @param DataQuery $subtractQuery |
||
| 1091 | * @param string $field |
||
| 1092 | * @return $this |
||
| 1093 | */ |
||
| 1094 | public function subtract(DataQuery $subtractQuery, $field = 'ID') |
||
| 1105 | } |
||
| 1106 | |||
| 1107 | /** |
||
| 1108 | * Select the only given fields from the given table. |
||
| 1109 | * |
||
| 1110 | * @param string $table Unquoted table name (will be escaped automatically) |
||
| 1111 | * @param array $fields Database column names (will be escaped automatically) |
||
| 1112 | * @return $this |
||
| 1113 | */ |
||
| 1114 | public function selectFromTable($table, $fields) |
||
| 1115 | { |
||
| 1116 | $fieldExpressions = array_map(function ($item) use ($table) { |
||
| 1117 | return Convert::symbol2sql("{$table}.{$item}"); |
||
| 1118 | }, $fields); |
||
| 1119 | |||
| 1120 | $this->query->setSelect($fieldExpressions); |
||
| 1121 | |||
| 1122 | return $this; |
||
| 1123 | } |
||
| 1124 | |||
| 1125 | /** |
||
| 1126 | * Add the given fields from the given table to the select statement. |
||
| 1127 | * |
||
| 1128 | * @param string $table Unquoted table name (will be escaped automatically) |
||
| 1129 | * @param array $fields Database column names (will be escaped automatically) |
||
| 1130 | * @return $this |
||
| 1131 | */ |
||
| 1132 | public function addSelectFromTable($table, $fields) |
||
| 1133 | { |
||
| 1134 | $fieldExpressions = array_map(function ($item) use ($table) { |
||
| 1135 | return Convert::symbol2sql("{$table}.{$item}"); |
||
| 1136 | }, $fields); |
||
| 1137 | |||
| 1138 | $this->query->addSelect($fieldExpressions); |
||
| 1139 | |||
| 1140 | return $this; |
||
| 1141 | } |
||
| 1142 | |||
| 1143 | /** |
||
| 1144 | * Query the given field column from the database and return as an array. |
||
| 1145 | * |
||
| 1146 | * @param string $field See {@link expressionForField()}. |
||
| 1147 | * @return array List of column values for the specified column |
||
| 1148 | */ |
||
| 1149 | public function column($field = 'ID') |
||
| 1150 | { |
||
| 1151 | $fieldExpression = $this->expressionForField($field); |
||
| 1152 | $query = $this->getFinalisedQuery(array($field)); |
||
| 1153 | $originalSelect = $query->getSelect(); |
||
| 1154 | $query->setSelect(array()); |
||
| 1155 | $query->selectField($fieldExpression, $field); |
||
| 1156 | $this->ensureSelectContainsOrderbyColumns($query, $originalSelect); |
||
| 1157 | |||
| 1158 | return $query->execute()->column($field); |
||
| 1159 | } |
||
| 1160 | |||
| 1161 | /** |
||
| 1162 | * @param string $field Select statement identifier, either the unquoted column name, |
||
| 1163 | * the full composite SQL statement, or the alias set through {@link SQLSelect->selectField()}. |
||
| 1164 | * @return string The expression used to query this field via this DataQuery |
||
| 1165 | */ |
||
| 1166 | protected function expressionForField($field) |
||
| 1167 | { |
||
| 1168 | // Prepare query object for selecting this field |
||
| 1169 | $query = $this->getFinalisedQuery(array($field)); |
||
| 1170 | |||
| 1171 | // Allow query to define the expression for this field |
||
| 1172 | $expression = $query->expressionForField($field); |
||
| 1173 | if (!empty($expression)) { |
||
| 1174 | return $expression; |
||
| 1175 | } |
||
| 1176 | |||
| 1177 | // Special case for ID, if not provided |
||
| 1178 | if ($field === 'ID') { |
||
| 1179 | return DataObject::getSchema()->sqlColumnForField($this->dataClass, 'ID'); |
||
| 1180 | } |
||
| 1181 | return null; |
||
| 1182 | } |
||
| 1183 | |||
| 1184 | /** |
||
| 1185 | * Select the given field expressions. |
||
| 1186 | * |
||
| 1187 | * @param string $fieldExpression String The field to select (escaped SQL statement) |
||
| 1188 | * @param string $alias String The alias of that field (escaped SQL statement) |
||
| 1189 | */ |
||
| 1190 | public function selectField($fieldExpression, $alias = null) |
||
| 1191 | { |
||
| 1192 | $this->query->selectField($fieldExpression, $alias); |
||
| 1193 | } |
||
| 1194 | |||
| 1195 | //// QUERY PARAMS |
||
| 1196 | |||
| 1197 | /** |
||
| 1198 | * An arbitrary store of query parameters that can be used by decorators. |
||
| 1199 | */ |
||
| 1200 | private $queryParams; |
||
| 1201 | |||
| 1202 | /** |
||
| 1203 | * Set an arbitrary query parameter, that can be used by decorators to add additional meta-data to the query. |
||
| 1204 | * It's expected that the $key will be namespaced, e.g, 'Versioned.stage' instead of just 'stage'. |
||
| 1205 | * |
||
| 1206 | * @param string $key |
||
| 1207 | * @param string|array $value |
||
| 1208 | * @return $this |
||
| 1209 | */ |
||
| 1210 | public function setQueryParam($key, $value) |
||
| 1211 | { |
||
| 1212 | $this->queryParams[$key] = $value; |
||
| 1213 | return $this; |
||
| 1214 | } |
||
| 1215 | |||
| 1216 | /** |
||
| 1217 | * Set an arbitrary query parameter, that can be used by decorators to add additional meta-data to the query. |
||
| 1218 | * |
||
| 1219 | * @param string $key |
||
| 1220 | * @return string |
||
| 1221 | */ |
||
| 1222 | public function getQueryParam($key) |
||
| 1223 | { |
||
| 1224 | if (isset($this->queryParams[$key])) { |
||
| 1225 | return $this->queryParams[$key]; |
||
| 1226 | } |
||
| 1227 | return null; |
||
| 1228 | } |
||
| 1229 | |||
| 1230 | /** |
||
| 1231 | * Returns all query parameters |
||
| 1232 | * @return array query parameters array |
||
| 1233 | */ |
||
| 1234 | public function getQueryParams() |
||
| 1237 | } |
||
| 1238 | |||
| 1239 | /** |
||
| 1240 | * Get query manipulators |
||
| 1241 | * |
||
| 1242 | * @return DataQueryManipulator[] |
||
| 1243 | */ |
||
| 1244 | public function getDataQueryManipulators() |
||
| 1245 | { |
||
| 1247 | } |
||
| 1248 | |||
| 1249 | /** |
||
| 1250 | * Assign callback to be invoked in getFinalisedQuery() |
||
| 1251 | * |
||
| 1252 | * @param DataQueryManipulator $manipulator |
||
| 1253 | * @return $this |
||
| 1254 | */ |
||
| 1255 | public function pushQueryManipulator(DataQueryManipulator $manipulator) |
||
| 1256 | { |
||
| 1257 | $this->dataQueryManipulators[] = $manipulator; |
||
| 1258 | return $this; |
||
| 1259 | } |
||
| 1260 | } |
||
| 1261 |
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