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<?php
abstract class SQLDAO implements DAO
{
protected $querier;
protected $model;
protected $table;
protected $pk_db_field;
protected $pk_property;
protected $pk_getter;
protected $pk_setter;
protected $fields_mapping = array();
protected $delete_query;
protected $insert_query;
protected $update_query;
protected $find_by_id_query;
protected $find_by_criteria_query;
public function __construct(MappingModel $model, SQLQuerier $querier = null)
{
$this->model = $model;
if ($querier == null)
{
$this->querier = PersistenceContext::get_querier();
}
else
{
$this->querier = $querier;
}
$this->cache_model();
}
public function save(PropertiesMapInterface $object)
{
$pk_value = $object->{$this->pk_getter}();
if (empty($pk_value))
{
$result = $this->raw_insert($object);
$object->{$this->pk_setter}($result->get_last_inserted_id());
}
else
{
$this->raw_update($object, $pk_value);
}
}
public function update(array $fields, $where = DAO::WHERE_ALL, array $parameters = array())
{
$this->querier->update($this->table, $fields, $where, $parameters);
}
public function delete(PropertiesMapInterface $object)
{
if ($this->delete_query === null)
{
$this->delete_query = 'DELETE FROM ' . $this->table .
' WHERE ' . $this->pk_db_field . '=:pk_value;';
}
$prepared_vars = array('pk_value' => $object->{$this->pk_getter}());
$this->querier->inject($this->delete_query, $prepared_vars);
}
public function delete_all($where = DAO::WHERE_ALL, array $parameters = array())
{
$this->querier->delete($this->table, $where, $parameters);
}
public function count($where = DAO::WHERE_ALL, array $parameters = array())
{
$this->querier->count($this->table, $where, $parameters);
}
public function find_by_id($id)
{
$this->compute_find_by_id_query();
$parameters = array('id' => $id);
$query_result = $this->querier->select($this->find_by_id_query, $parameters);
$query_result->rewind();
if ($query_result->valid())
{
return $this->model->new_instance($query_result->current());
}
throw new ObjectNotFoundException($this->model->get_class_name(), $id);
}
public function find_all($limit = DAO::FIND_ALL, $offset = 0, $order_by = array())
{
$query = '';
if (!empty($order_by))
{
$order_clause = '';
foreach ($order_by as $order)
{
$order_clause .= ', ' . $order['column'] . ' ' . $order['way'];
}
$query .= 'ORDER BY' . ltrim($order_clause, ',');
}
if ($limit != DAO::FIND_ALL)
{
$query .= ' LIMIT ' . $limit . ' OFFSET ' . $offset;
}
return $this->find_by_criteria($query . ';');
}
public function find_by_criteria($criteria, $parameters = array())
{
$this->compute_find_by_criteria_query();
$full_query = $this->find_by_criteria_query . $criteria;
$result = $this->querier->select($full_query, $parameters);
return new SelectQueryResultMapper($result, $this->model);
}
private function cache_model()
{
$this->table = $this->model->get_table_name();
$primary_key = $this->model->get_primary_key();
$this->pk_property = $primary_key->get_property_name();
$this->pk_db_field = $this->table . '.' . $primary_key->get_db_field_name();
$this->pk_getter = $primary_key->getter();
$this->pk_setter = $primary_key->setter();
foreach ($this->model->get_fields() as $field)
{
$this->fields_mapping[$field->get_property_name()] = $this->table .
'.' . $field->get_db_field_name();
}
}
private function raw_insert(PropertiesMapInterface $object)
{
$this->compute_insert_query();
$prepared_vars = $this->model->get_raw_value($object);
return $this->querier->inject($this->insert_query, $prepared_vars);
}
private function raw_update(PropertiesMapInterface $object, $pk_value)
{
$this->compute_update_query();
$prepared_vars = $this->model->get_raw_value($object);
$prepared_vars['pk_value'] = $pk_value;
return $this->querier->inject($this->update_query, $prepared_vars);
}
private function compute_find_by_id_query()
{
if ($this->find_by_id_query === null)
{
$this->compute_find_by_criteria_query();
$this->find_by_id_query = $this->find_by_criteria_query .
'WHERE ' . $this->pk_db_field . '=:id;';
}
}
private function compute_find_by_criteria_query()
{
if ($this->find_by_criteria_query === null)
{
$this->find_by_criteria_query = 'SELECT ' . $this->pk_db_field . ' AS ' .
$this->pk_property;
$this->add_select_columns($this->fields_mapping);
$left_joins = $this->compute_joins();
$this->find_by_criteria_query .= ' FROM ' . $this->table . ' ' .
implode(' ', $left_joins) . ' ';
}
}
private function compute_insert_query()
{
if ($this->insert_query === null)
{
$fields_list = array_keys($this->fields_mapping);
$this->insert_query = 'INSERT INTO ' . $this->table .
' (' . implode(', ', $fields_list) .
') VALUES(:' . implode(', :', $fields_list) . ');';
}
}
private function compute_update_query()
{
if ($this->update_query === null)
{
$fields_list = array();
foreach ($this->fields_mapping as $property => $field)
{
$fields_list[] = $field . '=:' . $property;
}
$this->update_query = 'UPDATE ' . $this->table . ' SET ' . implode(', ', $fields_list) .
' WHERE ' . $this->pk_db_field . '=:pk_value;';
}
}
private function add_select_columns($fields_mapping)
{
foreach ($fields_mapping as $property => $db_field)
{
$this->find_by_criteria_query .= ', ' . $db_field . ' AS ' . $property;
}
}
private function compute_joins()
{
$left_joins = array();
foreach ($this->model->get_joins() as $join)
{
$fields = array();
$table_name = $join->get_table_name();
$left_joins[] = 'LEFT JOIN ' . $table_name . ' ON ' . $table_name . '.' .
$join->get_primary_key()->get_db_field_name() . '=' . $join->get_fk_db_field_name();
foreach ($join->get_fields() as $field)
{
$fields[$field->get_property_name()] = $table_name . '.' .
$field->get_db_field_name();
}
$this->add_select_columns($fields);
}
return $left_joins;
}
}
?>