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<?php |
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namespace vakata\database\schema; |
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use vakata\collection\Collection; |
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use vakata\database\DBException; |
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/** |
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* A table query iterator |
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*/ |
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class TableQueryIterator implements \Iterator, \ArrayAccess |
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{ |
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const SEP = '___'; |
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/** |
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* @var array |
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*/ |
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protected $pkey; |
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/** |
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* @var Collection |
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*/ |
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protected $result; |
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/** |
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* @var array[] |
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*/ |
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protected $relations; |
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/** |
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* @var string|null |
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*/ |
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protected $primary = null; |
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/** |
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* @var int |
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*/ |
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protected $fetched = 0; |
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public function __construct(Collection $result, array $pkey, array $relations = []) |
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{ |
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$this->pkey = $pkey; |
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$this->result = $result; |
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$this->relations = $relations; |
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} |
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public function key() |
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{ |
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return $this->fetched; |
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} |
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public function current() |
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{ |
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$result = null; |
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$remove = []; |
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while ($this->result->valid()) { |
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$row = $this->result->current(); |
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$pk = []; |
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foreach ($this->pkey as $field) { |
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$pk[$field] = $row[$field]; |
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} |
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$pk = json_encode($pk); |
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if ($this->primary !== null && $pk !== $this->primary) { |
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break; |
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} |
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$this->primary = $pk; |
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if (!$result) { |
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$result = $row; |
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} |
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foreach ($this->relations as $name => $relation) { |
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$relation = $relation[0]; |
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$fields = []; |
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$exists = false; |
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foreach ($relation->table->getColumns() as $column) { |
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$fields[$column] = $row[$name . static::SEP . $column]; |
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if (!$exists && $row[$name . static::SEP . $column] !== null) { |
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$exists = true; |
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} |
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$remove[] = $name . static::SEP . $column; |
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} |
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$temp = &$result; |
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$parts = explode(static::SEP, $name); |
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$name = array_pop($parts); |
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if (!$exists && !count($parts) && !isset($temp[$name])) { |
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$temp[$name] = $relation->many ? [ '___clean' => true ] : null; |
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} |
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if ($exists) { |
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$full = ''; |
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foreach ($parts as $item) { |
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$full = $full ? $full . static::SEP . $item : $item; |
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$temp = &$temp[$item]; |
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$rpk = []; |
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foreach ($this->relations[$full][0]->table->getPrimaryKey() as $pkey) { |
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$rpk[$pkey] = $row[$full . static::SEP . $pkey]; |
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} |
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$temp = &$temp[json_encode($rpk)]; |
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} |
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if (!isset($temp[$name])) { |
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$temp[$name] = $relation->many ? [ '___clean' => true ] : null; |
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} |
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$temp = &$temp[$name]; |
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if ($relation->many) { |
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$rpk = []; |
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foreach ($relation->table->getPrimaryKey() as $field) { |
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$rpk[$field] = $fields[$field]; |
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} |
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$temp[json_encode($rpk)] = array_merge($temp[json_encode($rpk)] ?? [], $fields); |
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} else { |
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$temp = array_merge($temp ?? [], $fields); |
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} |
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} |
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} |
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$this->result->next(); |
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} |
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if ($result) { |
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foreach ($remove as $name) { |
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unset($result[$name]); |
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} |
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$result = $this->values($result); |
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} |
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return $result; |
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} |
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protected function values(array $data) |
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{ |
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foreach ($data as $k => $v) { |
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if (is_array($v) && isset($v['___clean']) && $v['___clean'] === true) { |
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unset($v['___clean']); |
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$data[$k] = array_values($v); |
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foreach ($data[$k] as $kk => $vv) { |
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$data[$k][$kk] = $this->values($vv); |
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} |
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} |
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} |
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return $data; |
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} |
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public function rewind() |
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{ |
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$this->fetched = 0; |
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$this->primary = null; |
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return $this->result->rewind(); |
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} |
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public function next() |
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{ |
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if ($this->primary === null) { |
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$this->result->next(); |
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if ($this->result->valid()) { |
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$row = $this->result->current(); |
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$temp = []; |
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foreach ($this->pkey as $field) { |
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$temp[$field] = $row[$field]; |
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} |
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$this->primary = json_encode($temp); |
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return; |
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} |
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} |
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$this->fetched ++; |
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while ($this->result->valid()) { |
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$row = $this->result->current(); |
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$pk = []; |
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foreach ($this->pkey as $field) { |
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$pk[$field] = $row[$field]; |
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} |
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$pk = json_encode($pk); |
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if ($this->primary !== $pk) { |
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$this->primary = $pk; |
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break; |
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} |
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$this->result->next(); |
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} |
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} |
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public function valid() |
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{ |
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return $this->result->valid(); |
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} |
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public function offsetGet($offset) |
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{ |
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$index = $this->fetched; |
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$item = null; |
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foreach ($this as $k => $v) { |
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if ($k === $offset) { |
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$item = $v; |
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} |
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} |
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foreach ($this as $k => $v) { |
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if ($k === $index) { |
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break; |
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} |
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} |
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return $item; |
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} |
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public function offsetExists($offset) |
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{ |
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$index = $this->fetched; |
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$exists = false; |
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foreach ($this as $k => $v) { |
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if ($k === $offset) { |
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$exists = true; |
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} |
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} |
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foreach ($this as $k => $v) { |
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if ($k === $index) { |
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break; |
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} |
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} |
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return $exists; |
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} |
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public function offsetSet($offset, $value) |
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{ |
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throw new DBException('Invalid call to offsetSet'); |
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} |
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public function offsetUnset($offset) |
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{ |
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throw new DBException('Invalid call to offsetUnset'); |
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} |
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} |
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vakata /
database
