Hibernate多条件查询，HQL拼接

今天学习Hibernate，要做一个或多个条件的查询的时候，需要用到判断进行HQL语句的拼接！

dao：

@Override
public PageBean<Student> findByAllMsg(Student student, int currentPage,
int pageSize) {
int begin = (currentPage - 1) * pageSize;

String hql = "from Student where 1=1";
if (student.getStuid() != -1) {
hql = hql + " AND stuid = " + student.getStuid();
}
if (student.getName() != "") {
hql = hql + " AND name = " + student.getName();
}
if (student.getBirthday() != null) {
hql = hql + " AND birthday = " + student.getBirthday();
}
if (student.getAge() != -1) {
hql = hql + " AND age = " + student.getAge();
}
if (student.getSex() != "") {
hql = hql + " AND sex = '" + student.getSex() + "'";
}
if (student.getGrade() != "") {
hql = hql + " AND grade = '" + student.getGrade() + "'";
}

Query query = sessionFactory.getCurrentSession().createQuery(hql);
query.setFirstResult(begin);
query.setMaxResults(pageSize);
List<Student> pageList = query.list();
return fenYe.base(pageSize, currentPage, hql, pageList);
}

entity：public class Student {

private int stuid;
private String name;
private Date birthday;
private int age;
private String sex;
private String grade;

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