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<?php |
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namespace samsonframework\orm; |
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use samsonframework\orm\exception\EntityNotFound; |
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/** |
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* Database query builder and executer. |
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* @author Vitaly Iegorov <[email protected]> |
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* @version 2.0 |
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*/ |
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class Query extends QueryHandler implements QueryInterface |
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{ |
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/** @var string Class name for interacting with database */ |
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protected $class_name; |
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/** @var array Collection of entity field names for sorting order */ |
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protected $sorting = array(); |
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/** @var array Collection of entity field names for grouping query results */ |
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protected $grouping = array(); |
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/** @var array Collection of query results limitations */ |
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protected $limitation = array(); |
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/** @var Condition Query base entity condition group */ |
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protected $own_condition; |
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/** @var Condition Query entity condition group */ |
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protected $cConditionGroup; |
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/** @var Database Database instance */ |
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protected $database; |
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/** |
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* Calling this class will result as changing entity. |
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* |
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* @param String $entity |
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* @see self::entity() |
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* @return self Chaining |
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* @throws EntityNotFound |
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*/ |
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public function __invoke($entity) |
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{ |
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return $this->entity($entity); |
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} |
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/** |
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* Query constructor. |
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* @param string|null $entity Entity identifier |
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* @param Database Database instance |
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* @throws EntityNotFound |
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*/ |
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public function __construct($entity, Database &$database) |
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{ |
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$this->database = &$database; |
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$this->entity($entity); |
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$this->flush(); |
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} |
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/** |
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* Reset all query parameters |
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* @return self Chaining |
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*/ |
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public function flush() |
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{ |
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$this->grouping = array(); |
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$this->limitation = array(); |
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$this->sorting = array(); |
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$this->cConditionGroup = new Condition(); |
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$this->own_condition = new Condition(); |
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return $this; |
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} |
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/** |
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* Perform database request and get collection of database record objects |
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* @see \samson\activerecord\Query::execute() |
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* @param mixed $return External variable to store query results |
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* @return mixed If no arguments passed returns query results collection, otherwise query success status |
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*/ |
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View Code Duplication |
public function exec(&$return = null) |
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{ |
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// Call handlers stack |
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$this->_callHandlers(); |
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/** @var RecordInterface[] Perform DB request */ |
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$return = $this->database->find($this->class_name, $this); |
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// Clear this query |
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$this->flush(); |
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// Return bool or collection |
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return func_num_args() ? sizeof($return) : $return; |
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} |
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/** |
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* Perform database request and get first record from results collection |
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* @see \samson\activerecord\Query::execute() |
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* @param mixed $return External variable to store query results |
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* @return mixed If no arguments passed returns query results first database record object, |
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* otherwise query success status |
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*/ |
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View Code Duplication |
public function first(& $return = null) |
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{ |
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// Call handlers stack |
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$this->_callHandlers(); |
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/** @var RecordInterface[] Perform DB request */ |
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$return = array_shift($this->database->find($this->class_name, $this)); |
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// Clear this query |
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$this->flush(); |
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// Return bool or collection |
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return func_num_args() ? sizeof($return) : $return; |
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} |
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/** |
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* Perform database request and get array of record field values |
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* @see \samson\activerecord\Query::execute() |
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* @param string $fieldName Record field name to get value from |
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* @param string $return External variable to store query results |
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* @return Ambigous <boolean, NULL, mixed> |
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*/ |
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View Code Duplication |
public function fields($fieldName, &$return = null) |
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{ |
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// Call handlers stack |
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$this->_callHandlers(); |
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// Perform DB request |
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$return = $this->database->fetchColumn($this->class_name, $this, $fieldName); |
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// Return bool or collection |
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return func_num_args() > 1 ? sizeof($return) : $return; |
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} |
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/** |
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* Set query entity to work with. |
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* |
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* @param string $entity Entity identifier |
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* @return Query|string Chaining or current entity identifier if nothing is passed |
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* @throws EntityNotFound |
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*/ |
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public function entity($entity = null) |
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{ |
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if (func_num_args() > 0) { |
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if (class_exists($entity)) { |
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$this->flush(); |
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$this->class_name = $entity; |
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} else { |
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throw new EntityNotFound('['.$entity.'] not found'); |
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} |
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return $this; |
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} |
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return $this->class_name; |
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} |
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/** |
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* Get correct query condition depending on entity field name. |
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* If base entity has field with this name - use base entity condition |
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* group, otherwise default condition group. |
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* |
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* @param string $fieldName Entity field name |
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* @return Condition Correct query condition group |
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*/ |
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protected function &getConditionGroup($fieldName) |
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{ |
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if (property_exists($this->class_name, $fieldName)) { |
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// Add this condition to base entity condition group |
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return $this->own_condition; |
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} |
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return $this->cConditionGroup; |
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} |
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/** |
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* Add query condition as prepared Condition instance. |
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* |
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* @param ConditionInterface $condition Condition to be added |
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* @return self Chaining |
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*/ |
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public function whereCondition(ConditionInterface $condition) |
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{ |
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// Iterate condition arguments |
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foreach ($condition as $argument) { |
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// If passed condition group has another condition group as argument |
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if (is_a($argument, __NAMESPACE__ . '\Condition')) { |
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// Go deeper in recursion |
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$this->whereCondition($argument); |
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} else { // Otherwise add condition argument to correct condition group |
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$this->getConditionGroup($argument->field)->addArgument($argument); |
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} |
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} |
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return $this; |
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} |
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/** |
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* Add condition to current query. |
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* |
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* @param string|Condition|Argument $fieldName Entity field name |
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* @param string $fieldValue Value |
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* @param string $relation Relation between field name and its value |
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* @return self Chaining |
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*/ |
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public function where($fieldName, $fieldValue = null, $relation = '=') |
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{ |
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// If empty array is passed |
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if (is_string($fieldName)) { |
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// Handle empty field value passing to avoid unexpected behaviour |
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if (!isset($fieldValue)) { |
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$relation = ArgumentInterface::ISNULL; |
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$fieldValue = ''; |
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} |
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// Add condition argument |
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$this->getConditionGroup($fieldName)->add($fieldName, $fieldValue, $relation); |
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} else { |
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throw new \InvalidArgumentException('You can only pass string as first argument'); |
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} |
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return $this; |
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} |
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/** |
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* Join entity to query. |
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* |
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* @param string $entityName Entity identifier |
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* @return self Chaining |
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*/ |
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public function join($entityName) |
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{ |
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// TODO: We need to implement this logic |
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$entityName .= ''; |
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// Chaining |
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return $this; |
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} |
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/** |
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* Add query result grouping. |
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* |
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* @param string $fieldName Entity field identifier for grouping |
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* @return self Chaining |
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*/ |
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public function groupBy($fieldName) |
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{ |
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$this->grouping[] = $fieldName; |
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// Chaining |
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return $this; |
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} |
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/** |
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* Add query result quantity limitation. |
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* |
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* @param int $offset Resulting offset |
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* @param null|int $quantity Amount of RecordInterface object to return |
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* @return self Chaining |
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*/ |
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public function limit($offset, $quantity = null) |
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{ |
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$this->limitation = array($offset, $quantity); |
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// Chaining |
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return $this; |
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} |
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/** |
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* Add query result sorting. |
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* |
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* @param string $fieldName Entity field identifier for worting |
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* @param string $order Sorting order |
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* @return self Chaining |
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*/ |
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public function orderBy($fieldName, $order = 'ASC') |
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{ |
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$this->sorting[] = array($fieldName, $order); |
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// Chaining |
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return $this; |
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} |
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/** |
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* Add condition by primary field |
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* |
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* @param string $value Primary field value |
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* @return self Chaining |
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*/ |
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public function id($value) |
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{ |
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// PHP 5.2 get primary field |
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$_primary = null; |
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eval('$_primary = ' . $this->class_name . '::$_primary;'); |
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// Set primary field value |
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return $this->where($_primary, $value); |
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} |
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/** |
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* Add condition to current query. |
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* This method supports receives three possible types for $fieldName, |
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* this is deprecated logic and this should be changed to use separate methods |
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* for each argument type. |
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* |
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* @param string|Condition|Argument $fieldName Entity field name |
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* @param string $fieldValue Value |
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* @param string $relation Relation between field name and its value |
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* @deprecated @see self::where() |
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* @return self Chaining |
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*/ |
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public function cond($fieldName, $fieldValue = null, $relation = '=') |
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{ |
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// If empty array is passed |
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if (is_string($fieldName)) { |
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return $this->where($fieldName, $fieldValue, $relation); |
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} elseif (is_array($fieldValue) && !sizeof($fieldValue)) { |
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$this->empty = true; |
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return $this; |
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} elseif (is_a($fieldName, __NAMESPACE__.'\Condition')) { |
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$this->whereCondition($fieldName); |
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} elseif (is_a($fieldName, __NAMESPACE__.'\Argument')) { |
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$this->getConditionGroup($fieldName->field)->addArgument($fieldName); |
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} |
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return $this; |
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} |
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} |
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