Question

因此，如果我要为员工制定限制，我会说

Criteria crit = sess.createCriteria(Employee.class);

所以现在我想弄清楚是否有可能不这样做：

List<String> employeeIds;

Criteria crit = sess.createCriteria(Employee.class);
crit.add(Restrictions.in("id", employeeIds));
crit.createAlias("car", "car");
return crit.list();

要做到这一点：

List<Employee> employees;

Criteria crit = sess.createCriteria(Employee.class);
crit.add(Restrictions.in("", employees));                //Doesn't work, but I think you get what I'm trying to do, query by objects themselves
crit.createAlias("car", "car");
return crit.list();

我正在尝试通过员工对象列表限制Employees的查询。后来我与另一个表连接，所以限制我正在为其创建条件的类的特定实例列表是有用的。

这与此示例SQL

相同

SELECT * FROM employees
    JOIN cars
        ON cars.ownerName like employees.name
    WHERE employees.id in
        (<list of employee ids goes here>);

Answer 1

我唯一的想法就是你要做什么才能真正获得你要检查的id列表。 Restrictions.in意味着您指定了一个属性，因此“”将不起作用。即使这比您发布的代码多得多，我认为这是解决您发布的问题的方法：

List<Employee> employees; // This has to be the list o employees
List<Integer> ids = new ArrayList();
Iterator it = employees.iterator();
while(it.hasNext()){
ids.add(((Employee)it.next()).getId());
}
Criteria crit = sess.createCriteria(Employee.class);
crit.add(Restrictions.in("id", ids));
crit.add(Restriction.eq("car","car"));

我希望这会有所帮助。

Answer 2

你试过这个吗？

     Criteria crit = sess.createCriteria(Employee.class, "employee");
     crit.add(Restrictions.in("employee", employees));

Hibernate Criteria限制由作为限制类实例的对象限制

2 个答案: