Jasper Report parameter returns wrong results - reporting

Question

I'm writing a report to get result from mysql database. The query has one parameter which is of type int in mysql database. I define a parameter of type java.lang.Integer but when I run the report and give it a value it doesn't return any data. I tried to change the parameter type to String, then I got incorrect results. Here is the report query:
SELECT
orders.`number` AS orders_number,
orders.`length` AS orders_length,
orders.`thick` AS orders_thick,
orders.`date` AS orders_date,
orders.`weight` AS orders_weight
FROM
`orders` orders
WHERE
orders.`customer_id` = $P{cust_id}
and here is the Order table schema:
CREATE TABLE `orders` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`customer_id` int(11) DEFAULT NULL,
`number` double DEFAULT NULL,
`length` double DEFAULT NULL,
`thick` int(11) DEFAULT NULL,
`weight` double DEFAULT NULL,
`date` date DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `customer_fk` (`customer_id`)
) ENGINE=InnoDB AUTO_INCREMENT=38 DEFAULT CHARSET=utf8$
Thanks,

Answer 1

Try switching the $P{} syntax for $P!{}. As in,
WHERE
orders.`customer_id` = $P!{cust_id}
Jasper usually works by converting the query to a java PreparedStatement object, then setting the parameters using the object's methods. The $P!{} syntax will do the parameter substitution before the query is converted to an object.