QueryDSL 3.4.3 使用子查询

因为时间有限先记录一下简单的几个写法，今天在项目中尝试一下，后续补充。

需要了解更多详细信息可以到官网查看：http://www.querydsl.com/static/querydsl/3.4.3/reference/html_single/#d0e593

主要疑惑的是子查询先记录一下：

example：

QDepartment department = QDepartment.department;
QDepartment d = new QDepartment("d"); query.from(department) .where(department.employees.size().eq( new JPASubQuery().from(d).unique(d.employees.size().max()) )).list(department);

QEmployee employee = QEmployee.employee;
QEmployee e = new QEmployee("e"); query.from(employee) .where(employee.weeklyhours.gt( new JPASubQuery().from(employee.department.employees, e) .where(e.manager.eq(employee.manager)) .unique(e.weeklyhours.avg()) )).list(employee);