HQL Query to check whether table has data or not

问题

Initially database created it doesn't have any table. I write code to update values using parameterised query but value doesn't exist initially then how we can handle it?

回答1:

You can try like this:

public Boolean existsOrNot (DTOAny i) {
    Query q = getSession().             
    createQuery("select 1 from DTOAny t where t.key = :key");
        q.setString("key", i.getKey() );
    return (q.uniqueResult() != null);
}

(Assuming that the table exists and you are checking that there is data in the table or not)

来源：https://stackoverflow.com/questions/29745464/hql-query-to-check-whether-table-has-data-or-not