HQL - Check if an Array contains a value

user_10201184 0
Viewed 1021

I have an array field in my first entity Class as below:

class Entity1{
       private Integer col1;
       private String col2;
       private Integer[] col3Arr;
}

I have another entity class as below:

class Entity2{
       private Integer col1;
       private String col2;
       private Integer col3;
}

I am fetching records by joining multiple other entities along with which I have to join Entity1 if col3Arr contains a value col3 from Entity 2

With PSQL, I could easily achieve this by following statement

//Other part of query
join Entity2 e2 on (//conditions from other joined tables//)
join Entity1 e1 on e2.col3=ANY(e1.col3Arr)

What is the HQL equivalent of ANY? Or is there any other way in HQL to check if an array contains a specific value?

spring-data-jpa hibernate-mapping postgresql hql hibernate
2 Answers

For mapping the arrays you will need a custom type. You can use the hibernate-types project for this: https://vladmihalcea.com/how-to-map-java-and-sql-arrays-with-jpa-and-hibernate/

Did you try to use e2.col3 = FUNCTION('ANY', e1.col3Arr) yet? If that doesn't work, I would suggest you create a custom SQLFunction that renders the SQL you desire e.g.

public class ArrayAny implements SQLFunction {

    @Override
    public boolean hasArguments() {
        return true;
    }

    @Override
    public boolean hasParenthesesIfNoArguments() {
        return true;
    }

    @Override
    public Type getReturnType(Type firstArgumentType, Mapping mapping) throws QueryException {
        return firstArgumentType;
    }

    @Override
    public String render(Type firstArgumentType, List args, SessionFactoryImplementor factory) throws QueryException {
        return "any(" + args.get(0) + ")";
    }
}

You will have to register the function within the Dialect.

user_4124460

According to the hibernate documentation:

When discussing arrays, it is important to understand the distinction between SQL array types and Java arrays that are mapped as part of the application’s domain model.

Not all databases implement the SQL-99 ARRAY type and, for this reason, Hibernate doesn’t support native database array types.

So, there is no equivalent of PSQL ANY in HQL.

user_62771040
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