/**
* Returns the relation ids for the variable specified of the object
* @param epObject $o the object
* @param epFieldMap $fm the field map of the variable
* @param epClassMap $cm the class map of the object
* @return false|string|array
*/
public function getRelationIds(&$o, $fm, $cm)
{
// make sure we are dealing with valid object and non-primitive field
if (!$o || !$fm || !$cm) {
return false;
}
// object needs to have a valid id and has to be non-primitive
if (!($oid_a = $o->epGetObjectId())) {
return false;
}
// get class_a, var_a, and the related class
$base_a = $fm->getBase_a();
$class_a = $cm->getName();
$var_a = $fm->getName();
$base_b = $fm->getBase_b();
if (!$base_a || !$class_a || !$var_a || !$base_b) {
throw new epExceptionManager('Cannot find related class for var [' . $class_a . '::' . $var_a . ']');
return false;
}
// switch relations table
$this->_setRelationTable($base_a, $base_b);
// make an example relation objects
if (!($eo =& $this->_relationExample($class_a, $oid_a, $var_a, $base_b))) {
return false;
}
// find all relation objects using the example object
// (find from db only, false: no cache, false: don't convert to objects)
$rs =& parent::find($eo, EP_GET_FROM_DB, false, false);
// convert result into oids
$oids_b = null;
if ($fm->isSingle()) {
if (is_array($rs) && count($rs) > 1) {
throw new epExceptionManager('Field ' . $fm->getName() . ' mapped as composed_of_/has_one but is associated with > 1 objects');
return false;
}
if ($rs) {
$oids_b = $rs[0];
}
} else {
if ($fm->isMany()) {
$oids_b = array();
if ($rs) {
$oids_b = $rs;
}
}
}
return $oids_b;
}
/**
* Generates SQL statement for -this- node and set up
* aliases for all classes (root class and subclasses)
* @return false|string
* @throws epExceptionQueryPath
*/
protected function _generateSql()
{
// -no- sql for primitive field
if ($this->fm->isPrimitive()) {
// only pass aliases from the parent to children
$this->class2alias = $this->getParent()->getAliases();
return '';
}
// get base a
$base_a = $this->fm->getBase_a();
// get base_b
$base_b = $this->fm->getBase_b();
// get class alias from parent
if (!($class2alias_a = $this->getParent()->getAliases())) {
throw new epExceptionQueryPath("no aliases found from parent node");
return false;
}
// check if spcific class is set. use it only if so.
if ($sc = $this->specificClass()) {
// get class map of specific class
if (!($cm_b = $this->_em()->getClassMap($sc))) {
throw new epExceptionQueryPath("no class map for classes and '{$sc}'");
return false;
}
} else {
// get class map of base b
if (!($cm_b = $this->_em()->getClassMap($base_b))) {
throw new epExceptionQueryPath("no class map for classes and '{$base_b}'");
return false;
}
}
// get relationship table with base_a and base_b
if (!($rt = $this->_em()->getRelationTable($base_a, $base_b))) {
throw new epExceptionQueryPath("no relationship table for classes '{$base_a}' and '{$base_b}'");
return false;
}
$aliases = array();
$aliases[] = '';
// check if we have any children contained
$children_contained = false;
if ($children = $this->getChildren()) {
foreach ($children as $child) {
if ($child->isRoot() && $child->isContained()) {
$aliases[] = $child->getAlias();
$children_contained = true;
}
}
}
$sql = '';
// go through each contained child
foreach ($aliases as $alias) {
// get alias for relationship table
if (!isset($this->table2alias[$rt . '.' . $alias])) {
$rt_alias = $this->_am()->getTableAlias($rt, true);
$this->table2alias[$rt . '.' . $alias] = $rt_alias;
} else {
$rt_alias = $this->table2alias[$rt . '.' . $alias];
}
// generate sql for class_a (including its subclasses)
if ($alias || !$children_contained) {
$sql .= $this->_generateSqlClassA($rt, $rt_alias, $this->fm->getName(), $class2alias_a);
}
// assemble sql for class b and subclasses
$cms_b = array();
// collect all children if no specific class set
if (!$this->specificClass()) {
$cms_b = $cm_b->getChildren(true);
}
array_unshift($cms_b, $cm_b);
foreach ($cms_b as $cm_b_) {
// skip abstract
if ($cm_b_->isAbstract()) {
continue;
}
// get class b name and make alias
$class_b = $cm_b_->getName();
if ($children_contained) {
// @@@ alias key may be in the form of 'ClassName.alias'
// @@@ to differentiate multiple aliases of the same class
if (!isset($this->class2alias[$class_b . '.' . $alias])) {
if (!$alias) {
$alias_b = $this->_am()->getClassAlias($class_b, true);
} else {
$alias_b = $this->class2alias[$class_b . '.'];
$this->_am()->setClassAlias($class_b, $alias_b . $alias);
}
$this->class2alias[$class_b . '.' . $alias] = $alias_b . $alias;
}
$alias_b = $this->class2alias[$class_b . '.' . $alias];
} else {
if (!isset($this->class2alias[$class_b])) {
$alias_b = $this->_am()->getClassAlias($class_b, true);
$this->class2alias[$class_b] = $alias_b;
} else {
$alias_b = $this->class2alias[$class_b];
}
}
// generate sql for class b
if ($alias || !$children_contained) {
$sql .= $this->_generateSqlClassB($rt_alias, $cm_b_->getTable(), $base_b, $class_b, $alias_b, $cm_b_->getOidColumn());
}
}
}
return $sql;
}
/**
* Make where part of a SQL select for relationship fields
* @param epDbObject $db the db connection
* @param epFieldMap $fm the field map
* @param epClassMap $cm the child object for query
* @param string $alias the alias of this table in the previous part
* @return array('from', 'where')
* @author Oak Nauhygon <*****@*****.**>
* @author Trevan Richins <*****@*****.**>
*/
public static function sqlSelectRelations($db, $fm, $cm, $table, $alias, $parentTable)
{
$base_a = $fm->getBase_a();
$class_a = $cm->getName();
$var_a = $fm->getName();
$base_b = $fm->getBase_b();
// call manager to get relation table for base class a and b
$rt = epManager::instance()->getRelationTable($base_a, $base_b);
// the alias of the table we are dealing with right now
$tbAlias = '_' . $alias;
$rtAlias = 'rt' . $alias;
// quoted aliases (avoid repeating)
$tbAlias_q = $db->quoteId($tbAlias);
$rtAlias_q = $db->quoteId($rtAlias);
// compute 'from' parts: tables with aliases
$from = array();
$from[] = $db->quoteId($table) . ' AS ' . $tbAlias_q;
$from[] = $db->quoteId($rt) . ' AS ' . $rtAlias_q;
// compute expressions 'where'
$where = array();
// rt.class_a =
$where[] = $rtAlias_q . '.' . $db->quoteId('class_a') . ' = ' . $db->quote($class_a);
// rt.var_a =
$where[] = $rtAlias_q . '.' . $db->quoteId('var_a') . ' = ' . $db->quote($var_a);
// rt.base_b =
$where[] = $rtAlias_q . '.' . $db->quoteId('base_b') . ' = ' . $db->quote($base_b);
// rt.class_b = TODO: doesn't look like it is used
//$where .= 'rt.'.$db->quoteId('class_b') . ' = ' . $db->quote($val->getClass());
// A.oid = rt.oid_a
$where[] = $db->quoteId($parentTable) . '.' . $db->quoteId($cm->getOidColumn()) . ' = ' . $rtAlias_q . '.' . $db->quoteId('oid_a');
// Child.oid = rt.oid_b
$where[] = $tbAlias_q . '.' . $db->quoteId($fm->getClassMap()->getOidColumn()) . ' = ' . $rtAlias_q . '.' . $db->quoteId('oid_b');
return array('from' => $from, 'where' => $where);
}
