Файл: framework/model/DataQuery.php
Строк: 966
<?php
/**
* An object representing a query of data from the DataObject's supporting database.
* Acts as a wrapper over {@link SQLQuery} and performs all of the query generation.
* Used extensively by {@link DataList}.
*
* Unlike DataList, modifiers on DataQuery modify the object rather than returning a clone.
* DataList is immutable, DataQuery is mutable.
*
* @subpackage model
* @package framework
*/
class DataQuery {
/**
* @var string
*/
protected $dataClass;
/**
* @var SQLQuery
*/
protected $query;
/**
* @var array
*/
protected $collidingFields = array();
private $queriedColumns = null;
/**
* @var Boolean
*/
private $queryFinalised = false;
// TODO: replace subclass_access with this
protected $querySubclasses = true;
// TODO: replace restrictclasses with this
protected $filterByClassName = true;
/**
* Create a new DataQuery.
*
* @param String The name of the DataObject class that you wish to query
*/
public function __construct($dataClass) {
$this->dataClass = $dataClass;
$this->initialiseQuery();
}
/**
* Clone this object
*/
public function __clone() {
$this->query = clone $this->query;
}
/**
* Return the {@link DataObject} class that is being queried.
*/
public function dataClass() {
return $this->dataClass;
}
/**
* Return the {@link SQLQuery} object that represents the current query; note that it will
* be a clone of the object.
*/
public function query() {
return $this->getFinalisedQuery();
}
/**
* Remove a filter from the query
*
* @param string|array $fieldExpression The predicate of the condition to remove
* (ignoring parameters). The expression will be considered a match if it's
* contained within any other predicate.
* @return DataQuery Self reference
*/
public function removeFilterOn($fieldExpression) {
$matched = false;
// If given a parameterised condition extract only the condition
if(is_array($fieldExpression)) {
reset($fieldExpression);
$fieldExpression = key($fieldExpression);
}
$where = $this->query->toAppropriateExpression()->getWhere();
// Iterate through each condition
foreach($where as $i => $condition) {
// Rewrite condition groups as plain conditions before comparison
if($condition instanceof SQLConditionGroup) {
$predicate = $condition->conditionSQL($parameters);
$condition = array($predicate => $parameters);
}
// As each condition is a single length array, do a single
// iteration to extract the predicate and parameters
foreach($condition as $predicate => $parameters) {
// @see SQLQuery::addWhere for why this is required here
if(strpos($predicate, $fieldExpression) !== false) {
unset($where[$i]);
$matched = true;
}
// Enforce single-item condition predicate => parameters structure
break;
}
}
// set the entire where clause back, but clear the original one first
if($matched) {
$this->query->setWhere($where);
} else {
throw new InvalidArgumentException("Couldn't find $fieldExpression in the query filter.");
}
return $this;
}
/**
* Set up the simplest initial query
*/
public function initialiseQuery() {
// Get the tables to join to.
// Don't get any subclass tables - let lazy loading do that.
$tableClasses = ClassInfo::ancestry($this->dataClass, true);
// Error checking
if(!$tableClasses) {
if(!SS_ClassLoader::instance()->hasManifest()) {
user_error("DataObjects have been requested before the manifest is loaded. Please ensure you are not"
. " querying the database in _config.php.", E_USER_ERROR);
} else {
user_error("DataList::create Can't find data classes (classes linked to tables) for"
. " $this->dataClass. Please ensure you run dev/build after creating a new DataObject.",
E_USER_ERROR);
}
}
$baseClass = array_shift($tableClasses);
// Build our intial query
$this->query = new SQLQuery(array());
$this->query->setDistinct(true);
if($sort = singleton($this->dataClass)->stat('default_sort')) {
$this->sort($sort);
}
$this->query->setFrom(""$baseClass"");
$obj = Injector::inst()->get($baseClass);
$obj->extend('augmentDataQueryCreation', $this->query, $this);
}
public function setQueriedColumns($queriedColumns) {
$this->queriedColumns = $queriedColumns;
}
/**
* Ensure that the query is ready to execute.
*
* @param array|null $queriedColumns Any columns to filter the query by
* @return SQLQuery The finalised sql query
*/
public function getFinalisedQuery($queriedColumns = null) {
if(!$queriedColumns) $queriedColumns = $this->queriedColumns;
if($queriedColumns) {
$queriedColumns = array_merge($queriedColumns, array('Created', 'LastEdited', 'ClassName'));
}
$query = clone $this->query;
$ancestorTables = ClassInfo::ancestry($this->dataClass, true);
// Generate the list of tables to iterate over and the list of columns required
// by any existing where clauses. This second step is skipped if we're fetching
// the whole dataobject as any required columns will get selected regardless.
if($queriedColumns) {
// Specifying certain columns allows joining of child tables
$tableClasses = ClassInfo::dataClassesFor($this->dataClass);
foreach ($query->getWhereParameterised($parameters) as $where) {
// Check for just the column, in the form '"Column" = ?' and the form '"Table"."Column"' = ?
if (preg_match('/^"([^"]+)"/', $where, $matches) ||
preg_match('/^"([^"]+)"."[^"]+"/', $where, $matches)) {
if (!in_array($matches[1], $queriedColumns)) $queriedColumns[] = $matches[1];
}
}
} else {
$tableClasses = $ancestorTables;
}
$tableNames = array_values($tableClasses);
$baseClass = $tableNames[0];
// Iterate over the tables and check what we need to select from them. If any selects are made (or the table is
// required for a select)
foreach($tableClasses as $tableClass) {
// Determine explicit columns to select
$selectColumns = null;
if ($queriedColumns) {
// Restrict queried columns to that on the selected table
$tableFields = DataObject::database_fields($tableClass, false);
$selectColumns = array_intersect($queriedColumns, array_keys($tableFields));
}
// If this is a subclass without any explicitly requested columns, omit this from the query
if(!in_array($tableClass, $ancestorTables) && empty($selectColumns)) continue;
// Select necessary columns (unless an explicitly empty array)
if($selectColumns !== array()) {
$this->selectColumnsFromTable($query, $tableClass, $selectColumns);
}
// Join if not the base table
if($tableClass !== $baseClass) {
$query->addLeftJoin($tableClass, ""$tableClass"."ID" = "$baseClass"."ID"", $tableClass, 10);
}
}
// Resolve colliding fields
if($this->collidingFields) {
foreach($this->collidingFields as $k => $collisions) {
$caseClauses = array();
foreach($collisions as $collision) {
if(preg_match('/^"([^"]+)"/', $collision, $matches)) {
$collisionBase = $matches[1];
if(class_exists($collisionBase)) {
$collisionClasses = ClassInfo::subclassesFor($collisionBase);
$collisionClasses = Convert::raw2sql($collisionClasses, true);
$caseClauses[] = "WHEN "$baseClass"."ClassName" IN ("
. implode(", ", $collisionClasses) . ") THEN $collision";
}
} else {
user_error("Bad collision item '$collision'", E_USER_WARNING);
}
}
$query->selectField("CASE " . implode( " ", $caseClauses) . " ELSE NULL END", $k);
}
}
if($this->filterByClassName) {
// If querying the base class, don't bother filtering on class name
if($this->dataClass != $baseClass) {
// Get the ClassName values to filter to
$classNames = ClassInfo::subclassesFor($this->dataClass);
if(!$classNames) user_error("DataList::create() Can't find data sub-classes for '$callerClass'");
$classNamesPlaceholders = DB::placeholders($classNames);
$query->addWhere(array(
""$baseClass"."ClassName" IN ($classNamesPlaceholders)" => $classNames
));
}
}
$query->selectField(""$baseClass"."ID"", "ID");
$query->selectField("
CASE WHEN "$baseClass"."ClassName" IS NOT NULL THEN "$baseClass"."ClassName"
ELSE ".Convert::raw2sql($baseClass, true)." END",
"RecordClassName"
);
// TODO: Versioned, Translatable, SiteTreeSubsites, etc, could probably be better implemented as subclasses
// of DataQuery
$obj = Injector::inst()->get($this->dataClass);
$obj->extend('augmentSQL', $query, $this);
$this->ensureSelectContainsOrderbyColumns($query);
return $query;
}
/**
* Ensure that if a query has an order by clause, those columns are present in the select.
*
* @param SQLQuery $query
* @return null
*/
protected function ensureSelectContainsOrderbyColumns($query, $originalSelect = array()) {
$tableClasses = ClassInfo::dataClassesFor($this->dataClass);
$baseClass = array_shift($tableClasses);
if($orderby = $query->getOrderBy()) {
$newOrderby = array();
$i = 0;
foreach($orderby as $k => $dir) {
$newOrderby[$k] = $dir;
// don't touch functions in the ORDER BY or public function calls
// selected as fields
if(strpos($k, '(') !== false) continue;
$col = str_replace('"', '', trim($k));
$parts = explode('.', $col);
// Pull through SortColumn references from the originalSelect variables
if(preg_match('/_SortColumn/', $col)) {
if(isset($originalSelect[$col])) {
$query->selectField($originalSelect[$col], $col);
}
continue;
}
if(count($parts) == 1) {
if(DataObject::has_own_table_database_field($baseClass, $parts[0])) {
$qualCol = ""$baseClass"."{$parts[0]}"";
} else {
$qualCol = ""$parts[0]"";
}
// remove original sort
unset($newOrderby[$k]);
// add new columns sort
$newOrderby[$qualCol] = $dir;
// To-do: Remove this if block once SQLQuery::$select has been refactored to store getSelect()
// format internally; then this check can be part of selectField()
$selects = $query->getSelect();
if(!isset($selects[$col]) && !in_array($qualCol, $selects)) {
$query->selectField($qualCol);
}
} else {
$qualCol = '"' . implode('"."', $parts) . '"';
if(!in_array($qualCol, $query->getSelect())) {
unset($newOrderby[$k]);
$newOrderby[""_SortColumn$i""] = $dir;
$query->selectField($qualCol, "_SortColumn$i");
$i++;
}
}
}
$query->setOrderBy($newOrderby);
}
}
/**
* Execute the query and return the result as {@link Query} object.
*/
public function execute() {
return $this->getFinalisedQuery()->execute();
}
/**
* Return this query's SQL
*
* @param array $parameters Out variable for parameters required for this query
* @return string The resulting SQL query (may be paramaterised)
*/
public function sql(&$parameters = array()) {
return $this->getFinalisedQuery()->sql($parameters);
}
/**
* Return the number of records in this query.
* Note that this will issue a separate SELECT COUNT() query.
*/
public function count() {
$baseClass = ClassInfo::baseDataClass($this->dataClass);
return $this->getFinalisedQuery()->count("DISTINCT "$baseClass"."ID"");
}
/**
* Return the maximum value of the given field in this DataList
*
* @param String $field Unquoted database column name. Will be ANSI quoted
* automatically so must not contain double quotes.
*/
public function max($field) {
return $this->aggregate("MAX("$field")");
}
/**
* Return the minimum value of the given field in this DataList
*
* @param String $field Unquoted database column name. Will be ANSI quoted
* automatically so must not contain double quotes.
*/
public function min($field) {
return $this->aggregate("MIN("$field")");
}
/**
* Return the average value of the given field in this DataList
*
* @param String $field Unquoted database column name. Will be ANSI quoted
* automatically so must not contain double quotes.
*/
public function avg($field) {
return $this->aggregate("AVG("$field")");
}
/**
* Return the sum of the values of the given field in this DataList
*
* @param String $field Unquoted database column name. Will be ANSI quoted
* automatically so must not contain double quotes.
*/
public function sum($field) {
return $this->aggregate("SUM("$field")");
}
/**
* Runs a raw aggregate expression. Please handle escaping yourself
*/
public function aggregate($expression) {
return $this->getFinalisedQuery()->aggregate($expression)->execute()->value();
}
/**
* Return the first row that would be returned by this full DataQuery
* Note that this will issue a separate SELECT ... LIMIT 1 query.
*/
public function firstRow() {
return $this->getFinalisedQuery()->firstRow();
}
/**
* Return the last row that would be returned by this full DataQuery
* Note that this will issue a separate SELECT ... LIMIT query.
*/
public function lastRow() {
return $this->getFinalisedQuery()->lastRow();
}
/**
* Update the SELECT clause of the query with the columns from the given table
*/
protected function selectColumnsFromTable(SQLQuery &$query, $tableClass, $columns = null) {
// Add SQL for multi-value fields
$databaseFields = DataObject::database_fields($tableClass, false);
$compositeFields = DataObject::composite_fields($tableClass, false);
if($databaseFields) foreach($databaseFields as $k => $v) {
if((is_null($columns) || in_array($k, $columns)) && !isset($compositeFields[$k])) {
// Update $collidingFields if necessary
if($expressionForField = $query->expressionForField($k)) {
if(!isset($this->collidingFields[$k])) $this->collidingFields[$k] = array($expressionForField);
$this->collidingFields[$k][] = ""$tableClass"."$k"";
} else {
$query->selectField(""$tableClass"."$k"", $k);
}
}
}
if($compositeFields) foreach($compositeFields as $k => $v) {
if((is_null($columns) || in_array($k, $columns)) && $v) {
$dbO = Object::create_from_string($v, $k);
$dbO->addToQuery($query);
}
}
}
/**
* Append a GROUP BY clause to this query.
*
* @param String $groupby Escaped SQL statement
*/
public function groupby($groupby) {
$this->query->addGroupBy($groupby);
return $this;
}
/**
* Append a HAVING clause to this query.
*
* @param String $having Escaped SQL statement
*/
public function having($having) {
$this->query->addHaving($having);
return $this;
}
/**
* Create a disjunctive subgroup.
*
* That is a subgroup joined by OR
*
* @return DataQuery_SubGroup
*/
public function disjunctiveGroup() {
return new DataQuery_SubGroup($this, 'OR');
}
/**
* Create a conjunctive subgroup
*
* That is a subgroup joined by AND
*
* @return DataQuery_SubGroup
*/
public function conjunctiveGroup() {
return new DataQuery_SubGroup($this, 'AND');
}
/**
* Adds a WHERE clause.
*
* @see SQLQuery::addWhere() for syntax examples, although DataQuery
* won't expand multiple arguments as SQLQuery does.
*
* @param string|array|SQLConditionGroup $filter Predicate(s) to set, as escaped SQL statements or
* paramaterised queries
* @return DataQuery
*/
public function where($filter) {
if($filter) {
$this->query->addWhere($filter);
}
return $this;
}
/**
* Append a WHERE with OR.
*
* @see SQLQuery::addWhere() for syntax examples, although DataQuery
* won't expand multiple method arguments as SQLQuery does.
*
* @param string|array|SQLConditionGroup $filter Predicate(s) to set, as escaped SQL statements or
* paramaterised queries
* @return DataQuery
*/
public function whereAny($filter) {
if($filter) {
$this->query->addWhereAny($filter);
}
return $this;
}
/**
* Set the ORDER BY clause of this query
*
* @see SQLQuery::orderby()
*
* @param String $sort Column to sort on (escaped SQL statement)
* @param String $direction Direction ("ASC" or "DESC", escaped SQL statement)
* @param Boolean $clear Clear existing values
* @return DataQuery
*/
public function sort($sort = null, $direction = null, $clear = true) {
if($clear) {
$this->query->setOrderBy($sort, $direction);
} else {
$this->query->addOrderBy($sort, $direction);
}
return $this;
}
/**
* Reverse order by clause
*
* @return DataQuery
*/
public function reverseSort() {
$this->query->reverseOrderBy();
return $this;
}
/**
* Set the limit of this query.
*
* @param int $limit
* @param int $offset
*/
public function limit($limit, $offset = 0) {
$this->query->setLimit($limit, $offset);
return $this;
}
/**
* Set whether this query should be distinct or not.
*
* @param bool $value
* @return DataQuery
*/
public function distinct($value) {
$this->query->setDistinct($value);
return $this;
}
/**
* Add an INNER JOIN clause to this query.
*
* @param String $table The unquoted table name to join to.
* @param String $onClause The filter for the join (escaped SQL statement)
* @param String $alias An optional alias name (unquoted)
* @param int $order A numerical index to control the order that joins are added to the query; lower order values
* will cause the query to appear first. The default is 20, and joins created automatically by the
* ORM have a value of 10.
* @param array $parameters Any additional parameters if the join is a parameterised subquery
*/
public function innerJoin($table, $onClause, $alias = null, $order = 20, $parameters = array()) {
if($table) {
$this->query->addInnerJoin($table, $onClause, $alias, $order, $parameters);
}
return $this;
}
/**
* Add a LEFT JOIN clause to this query.
*
* @param string $table The unquoted table to join to.
* @param string $onClause The filter for the join (escaped SQL statement).
* @param string $alias An optional alias name (unquoted)
* @param int $order A numerical index to control the order that joins are added to the query; lower order values
* will cause the query to appear first. The default is 20, and joins created automatically by the
* ORM have a value of 10.
* @param array $parameters Any additional parameters if the join is a parameterised subquery
*/
public function leftJoin($table, $onClause, $alias = null, $order = 20, $parameters = array()) {
if($table) {
$this->query->addLeftJoin($table, $onClause, $alias, $order, $parameters);
}
return $this;
}
/**
* Traverse the relationship fields, and add the table
* mappings to the query object state. This has to be called
* in any overloaded {@link SearchFilter->apply()} methods manually.
*
* @param String|array $relation The array/dot-syntax relation to follow
* @return The model class of the related item
*/
public function applyRelation($relation) {
// NO-OP
if(!$relation) return $this->dataClass;
if(is_string($relation)) $relation = explode(".", $relation);
$modelClass = $this->dataClass;
foreach($relation as $rel) {
$model = singleton($modelClass);
if ($component = $model->hasOneComponent($rel)) {
if(!$this->query->isJoinedTo($component)) {
$foreignKey = $rel;
$realModelClass = ClassInfo::table_for_object_field($modelClass, "{$foreignKey}ID");
$this->query->addLeftJoin($component,
""$component"."ID" = "{$realModelClass}"."{$foreignKey}ID"");
/**
* add join clause to the component's ancestry classes so that the search filter could search on
* its ancestor fields.
*/
$ancestry = ClassInfo::ancestry($component, true);
if(!empty($ancestry)){
$ancestry = array_reverse($ancestry);
foreach($ancestry as $ancestor){
if($ancestor != $component){
$this->query->addInnerJoin($ancestor, ""$component"."ID" = "$ancestor"."ID"");
}
}
}
}
$modelClass = $component;
} elseif ($component = $model->hasManyComponent($rel)) {
if(!$this->query->isJoinedTo($component)) {
$ancestry = $model->getClassAncestry();
$foreignKey = $model->getRemoteJoinField($rel);
$this->query->addLeftJoin($component,
""$component"."{$foreignKey}" = "{$ancestry[0]}"."ID"");
/**
* add join clause to the component's ancestry classes so that the search filter could search on
* its ancestor fields.
*/
$ancestry = ClassInfo::ancestry($component, true);
if(!empty($ancestry)){
$ancestry = array_reverse($ancestry);
foreach($ancestry as $ancestor){
if($ancestor != $component){
$this->query->addInnerJoin($ancestor, ""$component"."ID" = "$ancestor"."ID"");
}
}
}
}
$modelClass = $component;
} elseif ($component = $model->manyManyComponent($rel)) {
list($parentClass, $componentClass, $parentField, $componentField, $relationTable) = $component;
$parentBaseClass = ClassInfo::baseDataClass($parentClass);
$componentBaseClass = ClassInfo::baseDataClass($componentClass);
$this->query->addInnerJoin($relationTable,
""$relationTable"."$parentField" = "$parentBaseClass"."ID"");
$this->query->addLeftJoin($componentBaseClass,
""$relationTable"."$componentField" = "$componentBaseClass"."ID"");
if(ClassInfo::hasTable($componentClass)) {
$this->query->addLeftJoin($componentClass,
""$relationTable"."$componentField" = "$componentClass"."ID"");
}
$modelClass = $componentClass;
}
}
return $modelClass;
}
/**
* Removes the result of query from this query.
*
* @param DataQuery $subtractQuery
* @param string $field
*/
public function subtract(DataQuery $subtractQuery, $field='ID') {
$fieldExpression = $subtractQuery->expressionForField($field);
$subSelect = $subtractQuery->getFinalisedQuery();
$subSelect->setSelect(array());
$subSelect->selectField($fieldExpression, $field);
$subSelect->setOrderBy(null);
$subSelectSQL = $subSelect->sql($subSelectParameters);
$this->where(array($this->expressionForField($field)." NOT IN ($subSelectSQL)" => $subSelectParameters));
return $this;
}
/**
* Select the given fields from the given table.
*
* @param String $table Unquoted table name (will be escaped automatically)
* @param Array $fields Database column names (will be escaped automatically)
*/
public function selectFromTable($table, $fields) {
$fieldExpressions = array_map(function($item) use($table) {
return ""$table"."$item"";
}, $fields);
$this->query->setSelect($fieldExpressions);
return $this;
}
/**
* Query the given field column from the database and return as an array.
*
* @param string $field See {@link expressionForField()}.
* @return array List of column values for the specified column
*/
public function column($field = 'ID') {
$fieldExpression = $this->expressionForField($field);
$query = $this->getFinalisedQuery(array($field));
$originalSelect = $query->getSelect();
$query->setSelect(array());
$query->selectField($fieldExpression, $field);
$this->ensureSelectContainsOrderbyColumns($query, $originalSelect);
return $query->execute()->column($field);
}
/**
* @param String $field Select statement identifier, either the unquoted column name,
* the full composite SQL statement, or the alias set through {@link SQLQuery->selectField()}.
* @return String The expression used to query this field via this DataQuery
*/
protected function expressionForField($field) {
// Prepare query object for selecting this field
$query = $this->getFinalisedQuery(array($field));
// Allow query to define the expression for this field
$expression = $query->expressionForField($field);
if(!empty($expression)) return $expression;
// Special case for ID, if not provided
if($field === 'ID') {
$baseClass = ClassInfo::baseDataClass($this->dataClass);
return ""$baseClass"."ID"";
}
}
/**
* Select the given field expressions.
*
* @param $fieldExpression String The field to select (escaped SQL statement)
* @param $alias String The alias of that field (escaped SQL statement)
*/
protected function selectField($fieldExpression, $alias = null) {
$this->query->selectField($fieldExpression, $alias);
}
//// QUERY PARAMS
/**
* An arbitrary store of query parameters that can be used by decorators.
* @todo This will probably be made obsolete if we have subclasses of DataList and/or DataQuery.
*/
private $queryParams;
/**
* Set an arbitrary query parameter, that can be used by decorators to add additional meta-data to the query.
* It's expected that the $key will be namespaced, e.g, 'Versioned.stage' instead of just 'stage'.
*/
public function setQueryParam($key, $value) {
$this->queryParams[$key] = $value;
}
/**
* Set an arbitrary query parameter, that can be used by decorators to add additional meta-data to the query.
*/
public function getQueryParam($key) {
if(isset($this->queryParams[$key])) return $this->queryParams[$key];
else return null;
}
/**
* Returns all query parameters
* @return array query parameters array
*/
public function getQueryParams() {
return $this->queryParams;
}
}
/**
* Represents a subgroup inside a WHERE clause in a {@link DataQuery}
*
* Stores the clauses for the subgroup inside a specific {@link SQLQuery}
* object.
*
* All non-where methods call their DataQuery versions, which uses the base
* query object.
*
* @package framework
*/
class DataQuery_SubGroup extends DataQuery implements SQLConditionGroup {
/**
*
* @var SQLQuery
*/
protected $whereQuery;
public function __construct(DataQuery $base, $connective) {
$this->dataClass = $base->dataClass;
$this->query = $base->query;
$this->whereQuery = new SQLQuery();
$this->whereQuery->setConnective($connective);
$base->where($this);
}
public function where($filter) {
if($filter) {
$this->whereQuery->addWhere($filter);
}
return $this;
}
public function whereAny($filter) {
if($filter) {
$this->whereQuery->addWhereAny($filter);
}
return $this;
}
public function conditionSQL(&$parameters) {
$parameters = array();
// Ignore empty conditions
$query = $this->whereQuery->toAppropriateExpression();
$where = $query->getWhere();
if(empty($where)) {
return null;
}
// Allow database to manage joining of conditions
$sql = DB::get_conn()->getQueryBuilder()->buildWhereFragment($query, $parameters);
return preg_replace('/^s*WHEREs*/i', '', $sql);
}
}