QueryDsl：选择符合条件的行数

Question

I have 2 records in db. Where I will do this:

QLoginRegistryEntry loginregistryentry = QLoginRegistryEntry.loginRegistryEntry;
JPAQuery query = new JPAQuery(JPA.em());
List<LoginRegistryEntry> result;
result = query.from(loginregistryentry)
              .where(loginregistryentry.inDate.startsWith(yearAndMonth))
              .list(loginregistryentry);

System.out.println(result.size());

It return 2, which is correct

When I do this:

QLoginRegistryEntry loginregistryentry2 = new QLoginRegistryEntry("a");
long count = query.from(loginregistryentry2).count();
System.out.println(count);

It return 4, which is wrong

What Am I doing wrong? How should I download the count of rows that meets my criteria?

Answer 1

I don't think you executed the queries in isolation. Probably you just reused the query object from your first query and continued, you got a cross join and got 2 * 2 = 4 results.