1366 incorrect decimal value for column bikeprice at row 1

Question

I use a sql insert statement that the values are coming from a form input based on active record design pattern and it throws me the above error, and I don’t know how to fix it. The sql insert statement is as follow:

$sql = “INSERT INTO bikes(bikename, bikeprice, bikeimage, description) VALUES ( ‘$this->bikename’,’$this->bikeprice’,’$this->bikeimage’,’$this->description’)”;

The main problem is with the bikeprice which the data type is decimal(9,2) in Php my admin database. $this->bikeprice is the class property which is defined in the

__construct($args=[]){ $this->bikeprice = $args[‘bikeprice’] ?? ‘’; ……}

and

if(isset($_POST[‘Insert’])){ 
    $args = []; 
    $args[‘bikeprice’] = $_POST[‘bikeprice’] ?? NULL; 
    …
    $bike = new Bike($args); …
} 

I mean by this how to store a decimal value from an input field to database.