Doctrine\DBAL\Driver\Mysqli\MysqliStatement::execute PHP Method

    public function execute($params = null)
    {
        if (null !== $this->_bindedValues) {
            if (null !== $params) {
                if (!$this->_bindValues($params)) {
                    throw new MysqliException($this->_stmt->error, $this->_stmt->errno);
                }
            } else {
                if (!call_user_func_array(array($this->_stmt, 'bind_param'), array($this->types) + $this->_bindedValues)) {
                    throw new MysqliException($this->_stmt->error, $this->_stmt->sqlstate, $this->_stmt->errno);
                }
            }
        }
        if (!$this->_stmt->execute()) {
            throw new MysqliException($this->_stmt->error, $this->_stmt->sqlstate, $this->_stmt->errno);
        }
        if (null === $this->_columnNames) {
            $meta = $this->_stmt->result_metadata();
            if (false !== $meta) {
                // We have a result.
                $this->_stmt->store_result();
                $columnNames = array();
                foreach ($meta->fetch_fields() as $col) {
                    $columnNames[] = $col->name;
                }
                $meta->free();
                $this->_columnNames = $columnNames;
                $this->_rowBindedValues = array_fill(0, count($columnNames), null);
                $refs = array();
                foreach ($this->_rowBindedValues as $key => &$value) {
                    $refs[$key] =& $value;
                }
                if (!call_user_func_array(array($this->_stmt, 'bind_result'), $refs)) {
                    throw new MysqliException($this->_stmt->error, $this->_stmt->sqlstate, $this->_stmt->errno);
                }
            } else {
                $this->_columnNames = false;
            }
        }
        return true;
    }