mysqli :: query（）：无法获取mysqli

警告：mysqli :: query（）：无法在第43行上的C：\ Program Files（x86）\ EasyPHP-DevServer-13.1VC9 \ data \ localweb \ my Portable files \ class_EventCalendar.php中获取mysqli

以下是我的连接文件：

connect_errno) { // Add error to errors array $ErrorMsgs[]="The database server is not available.". " Connect Error is ".$DBConnect->connect_errno." ". $DBConnect->connect_error."."; } ?> 这是我的课： DBConnect = $DBConnect; } function __destruct() { if (!$this->DBConnect->connect_error) { $this->DBConnect->close(); } } function __wakeup() { // Include the database connection data include("inc_LadleDB.php"); $this->DBConnect = $DBConnect; } // Function to add events to Zodiac calendar public function addEvent($Date, $Title, $Description) { // Check to see if the required fields of Date and Title have been entered if ((!empty($Date)) && (!empty($Title))) { /* if all fields are complete then they are inserted into the Zodiac event_calendar table */ $SQLString = "INSERT INTO tblSignUps". " (EventDate, Title, Description) ". " VALUES('$Date', '$Title', '". $Description."')"; // Store query results in a variable $QueryResult = $this->DBConnect->query($SQLString); 我对OOP PHP不太满意，而且不确定为什么会引发此错误。我从其他地方提取了此代码，唯一更改的是@new mysqli参数。谁能帮助我了解问题出在哪里？