java - 如何针对多个和/或条件使用 Criteria API 对象

Question

我遇到了多个和/或条件的问题。情况是这样的，我有带有 user、dateFrom 和 dateTo 字段的 WorkTime 实体以及带有organizationUnit 字段的 User 实体。我正在构建以下查询来获取日期之间的工作时间，包括那些与这些日期重叠的日期:

// main condition to get only users from given organizational unit
Predicate restriction = root.get(WorkTime_.user).get(User_.organizationalUnit).in((Object[]) orgUnits);

// first date condition to get work time between border dates
Predicate dateInRestr = builder.greaterThanOrEqualTo(root.get(WorkTime_.dateFrom), dateFrom);
dateInRestr = builder.and(dateInRestr, builder.lessThanOrEqualTo(root.get(WorkTime_.dateTo), dateTo));

// second date condition to get work time overlap border dates 
ParameterExpression<Date> dateFromParam = builder.parameter(Date.class);
ParameterExpression<Date> dateToParam = builder.parameter(Date.class);
Predicate dateOutRestr = builder.between(dateFromParam, root.get(WorkTime_.dateFrom), root.get(WorkTime_.dateTo));
dateOutRestr = builder.or(dateOutRestr, builder.between(dateToParam, root.get(WorkTime_.dateFrom), root.get(WorkTime_.dateTo)));

// OR for dates condition 
Predicate dateRestr = builder.or(dateInRestr, dateOutRestr);
// AND with unit condition
query.where(restriction, dateRestr);

一般情况下它工作正常，但 PostgreSQL 中的结果查询如下所示(仅显示条件部分):

and (user1_.ORG_UNIT_ID in (? , ? , ? , ? , ? , ?)) 
and (worktime0_.DATEFROM>=? and worktime0_.DATETO<=? 
    or ? between worktime0_.DATEFROM and worktime0_.DATETO
    or ? between worktime0_.DATEFROM and worktime0_.DATETO) 

我是否可以在 OR 条件元素周围添加额外的括号，以便查询如下所示:

and (user1_.ORG_UNIT_ID in (? , ? , ? , ? , ? , ?)) 
and ((worktime0_.DATEFROM>=? and worktime0_.DATETO<=?) 
    or (? between worktime0_.DATEFROM and worktime0_.DATETO)
    or (? between worktime0_.DATEFROM and worktime0_.DATETO)) 

或者从 SQL 的角度来看这并不重要？我担心它不适用于其他 RDMBS。

Answer 1

Criteria API 已为您返回有效的 SQL。它在需要的地方添加了括号，从我的仔细阅读来看，我看不出它会对任何其他 RDBMS 造成麻烦。