预期类型：java.lang.Double 实际值：hibernate 中的 java.lang.Integer 错误

Question

I call the stored procedure in hibernate using createSqlQuery interface and i am using result transformer for getting the result as bean. below is my code for that

Query query=sessionfactory.getCurrentSession().createSQLQuery("exec usp_ListUsersNotSubmitTimesheet :startDate,:endDate");
        query.setDate("startDate", formatter.parse(startDate));
        query.setDate("endDate", formatter.parse(endDate));
        query.setResultTransformer(Transformers.aliasToBean(UnSubmittedTimesheetBean.class));
List queryList=query.list();

Some times sp result returns all integer values some times decimal values sometimes fixed.so i can't able to give the specific datatype. so i am getting the below exception

expected type: java.lang.Double actual value: java.lang.Integer 

How to resolve this error?

Any help will be greatly appreciated!!!

Answer 1

Your Stored Procedure is returning Integer data type value and I guess in your bean the mapped column is defined as Double so when Transformer is going to set the results in Bean it is trying to set Integer value to Double value and there it is throwing exception...

1> You can Either made changes in your Bean class (can make column as Integer).

2> you can change returned type of procedure that will return Double Precision.

3> and the complicated one of you are not allowed to change any of the above You can write your own Result Transformer by Extending "AbstractQueryTransformer".

i prefer the second one.

Answer 2

My solution is just add casting in your stored procedure as what int / decimal

So that you can easily handle the datatype in your result transformer bean. Otherwise in you result transformer make all those fields as "Number" and then change the "Number" object to any other things based on your need.

Answer 3

Fastest solution, change the stored procedure so that the result is always a double precision number, regardless of anything (you'll need to change the sp code, maybe the return type, as I don't know your sp). Solution if you can't touch the db: Build a result transformer to accept integer, float, whatever and accomodate it into a double after doing some processing.

Answer 4

I faced similar with complex SQL Joins for 2 fields. The exception shown on the console was

expected type: java.lang.Double actual value: java.math.BigDecimal

To solve this I have explicitly mapped the datatype for those fields using addScalar() method

session.createSQLQuery(query.toString())
                .addScalar("offerid", StandardBasicTypes.INTEGER)
                .addScalar("offervalue", StandardBasicTypes.DOUBLE)