}
/**
- * Get a cell
+ * Get a cell or parent rows
* @param string $p
* @return \pq\Gateway\Cell|\pq\Gateway\Rowset
*/
function __get($p) {
- if (isset($this->data["{$p}_id"])) {
- // FIXME cache
- return $this->getTable()->by($this, $p);
+ if ($this->table->hasRelation($p)) {
+ return $this->table->by($this, $p);
}
if (!isset($this->cell[$p])) {
$this->cell[$p] = new Cell($this, $p, isset($this->data[$p]) ? $this->data[$p] : null);
$this->__get($p)->set($v);
}
+ /**
+ * Unset a cell value
+ * @param string $p
+ */
function __unset($p) {
unset($this->data[$p]);
unset($this->cell[$p]);
}
+ /**
+ * Check if a cell isset
+ * @param string $p
+ * @return bool
+ */
function __isset($p) {
return isset($this->data[$p]) || isset($this->cell[$p]);
}
+ /**
+ * Get child rows of this row by foreign key
+ * @see \pq\Gateway\Table::of()
+ * @param string $foreign
+ * @param array $args [order, limit, offset]
+ * @return \pq\Gateway\Rowset
+ */
+ function __call($foreign, array $args) {
+ array_unshift($args, $this);
+ $table = forward_static_call(array(get_class($this->getTable()), "resolve"), $foreign);
+ return call_user_func_array(array($table, "of"), $args);
+ }
+
/**
* Create this row in the database
* @return \pq\Gateway\Row
*/
public static $defaultConnection;
+ /**
+ * @var callable
+ */
+ public static $defaultResolver;
+
/**
* @var \pq\Connection
*/
* @var \pq\Query\ExecutorInterface
*/
protected $exec;
-
+
/**
- * @var array
+ * @var \pq\Gateway\Table\Relations
*/
- protected $dependents;
+ protected $relations;
+ /**
+ * @param string $table
+ * @return \pq\Gateway\Table
+ */
+ public static function resolve($table) {
+ if ($table instanceof Table) {
+ return $table;
+ }
+ if (is_callable(static::$defaultResolver)) {
+ if (($resolved = call_user_func(static::$defaultResolver, $table))) {
+ return $resolved;
+ }
+ }
+ return new Table($table);
+ }
+
/**
* @param string $name
* @param \pq\Connection $conn
* @param array $dependents
*/
- function __construct($name, \pq\Connection $conn = null, array $dependents = array()) {
+ function __construct($name, \pq\Connection $conn = null) {
$this->name = $name;
$this->conn = $conn ?: static::$defaultConnection ?: new \pq\Connection;
- $this->dependents = $dependents;
}
/**
return $this->exec;
}
+ /**
+ * Get foreign key relations
+ * @param string $to fkey
+ * @return \pq\Gateway\Table\Relations|stdClass
+ */
+ function getRelations($to = null) {
+ if (!isset($this->relations)) {
+ $this->relations = new Table\Relations($this);
+ }
+ if (isset($to)) {
+ if (!isset($this->relations->$to)) {
+ return null;
+ }
+ return $this->relations->$to;
+ }
+ return $this->relations;
+ }
+
+ /**
+ * Check whether a certain relation exists
+ * @param string $name
+ * @param string $table
+ * @return bool
+ */
+ function hasRelation($name, $table = null) {
+ if (!($rel = $this->getRelations($name))) {
+ return false;
+ }
+ if (!isset($table)) {
+ return true;
+ }
+ return isset($rel->$table);
+ }
+
/**
* @return \pq\Connection
*/
* @return mixed
*/
protected function execute(QueryWriter $query) {
+ echo $query,"\n",json_encode($query->getParams()),"\n";
return $this->getQueryExecutor()->execute($query, array($this, "onResult"));
}
* @param \pq\Result $result
* @return mixed
*/
- public function onResult(\pq\Result $result) {
- if ($result->status != \pq\Result::TUPLES_OK) {
+ public function onResult(\pq\Result $result = null) {
+ if ($result && $result->status != \pq\Result::TUPLES_OK) {
return $result;
}
}
/**
- * Get the parent row of a row by foreign key
- * @param \pq\Gateway\Row $dependent
+ * Get the child rows of a row by foreign key
+ * @param \pq\Gateway\Row $foreign
* @param string $name optional fkey name
* @param string $order
* @param int $limit
* @param int $offset
* @return mixed
*/
- function of(Row $dependent, $name = null, $order = null, $limit = 0, $offset = 0) {
- if (!$name) {
- $name = $dependent->getTable()->getName();
+ function of(Row $foreign, $name = null, $order = null, $limit = 0, $offset = 0) {
+ // select * from $this where $this->$foreignColumn = $foreign->$referencedColumn
+
+ if (!isset($name)) {
+ $name = $this->getName();
+ }
+
+ if (!$foreign->getTable()->hasRelation($name, $this->getName())) {
+ return $this->onResult(null);
}
- return $this->find(array("{$name}_id=" => $dependent->id),
- $order, $limit, $offset);
+ $rel = $foreign->getTable()->getRelations($name)->{$this->getName()};
+
+ return $this->find(
+ array($rel->foreignColumn . "=" => $foreign->{$rel->referencedColumn}),
+ $order, $limit, $offset
+ );
}
/**
- * Get the child rows of a row by foreign key
+ * Get the parent rows of a row by foreign key
* @param \pq\Gateway\Row $me
- * @param string $dependent
+ * @param string $foreign
* @param string $order
* @param int $limit
* @param int $offset
* @return mixed
- * @throws \LogicException
*/
- function by(Row $me, $dependent, $order = null, $limit = 0, $offset = 0) {
- if (!isset($this->dependents[$dependent])) {
- throw new \LogicException("Unknown dependent table $dependent");
+ function by(Row $me, $foreign, $order = null, $limit = 0, $offset = 0) {
+ // select * from $foreign where $foreign->$referencedColumn = $me->$foreignColumn
+
+ if (!$this->hasRelation($foreign, $this->getName())) {
+ return $this->onResult(null);
}
+ $rel = $this->getRelations($foreign)->{$this->getName()};
- $dependentClass = $this->dependents[$dependent];
- $dependentModel = new $dependentClass($this->conn);
- return $dependentModel->of($me, null, $order, $limit, $offset);
+ return static::resolve($rel->referencedTable)->find(
+ array($rel->referencedColumn . "=" => $me->{$rel->foreignColumn}),
+ $order, $limit, $offset
+ );
}
/**
--- /dev/null
+<?php
+
+namespace pq\Gateway\Table;
+
+use \pq\Gateway\Table;
+
+const RELATION_SQL = <<<SQL
+select
+ substring(att1.attname from '^.*(?=_'||att2.attname||'$)') as "id"
+ ,cl1.relname as "foreignTable"
+ ,att1.attname as "foreignColumn"
+ ,cl2.relname as "referencedTable"
+ ,att2.attname as "referencedColumn"
+from
+ pg_constraint co
+ ,pg_class cl2
+ ,pg_class cl1
+ ,pg_attribute att2
+ ,pg_attribute att1
+where
+ ( cl1.relname = \$1
+ or cl2.relname = \$1)
+and co.confrelid != 0
+and co.confrelid = cl2.oid
+and co.conrelid = cl1.oid
+and co.confkey[1] = att2.attnum and cl2.oid = att2.attrelid
+and co.conkey[1] = att1.attnum and cl1.oid = att1.attrelid
+order by
+ cl1.relname
+ ,att1.attnum
+SQL;
+
+class Relations
+{
+ public $references;
+
+ function __construct(Table $table) {
+ // FIXME cache
+ $this->references = $table->getConnection()
+ ->execParams(RELATION_SQL, array($table->getName()))
+ ->map(array(0,1), array(2,3,4), \pq\Result::FETCH_OBJECT);
+ }
+
+ function __isset($r) {
+ return isset($this->references->$r);
+ }
+
+ function __get($r) {
+ return $this->references->$r;
+ }
+
+ function __set($r, $v) {
+ $this->references->$r = $v;
+ }
+
+ function __unset($r){
+ unset($this->references->$r);
+ }
+}
projects / m6w6 / pq-gateway / commitdiff
