我试图找出是否可以使用Hibernate Criteria API进行以下HQL:
String hql = "select new InitialCount(substring(name, 1,1), count(id)) from Person group by substring(name, 1,1)";
其中InitialCount是一个非常简单的,具有字符串和长构造函数的bean:
public static class InitialCount {
private final String initial;
private final long count;
public InitialCount(String initial, long count) {
this.initial = initial;
this.count = count;
}
}
可能吗?
最佳答案
尝试这个 :
criteria.setProjection(Projections.projectionList()
.add(Projections.groupProperty("formulaProp").as("initial"))
.add(Projections.count("id").as("count"))
).setResultTransformer(Transformers.aliasToBean(InitialCount.class)).list();
其中,公式属性是映射到公式“ substring(name,1,1)”的人员的属性