[英]HQL query where exists or between list elements
I have a Tag class like this: 我有这样的Tag类:
public class Tag {
private Long id;
private String title;
private Set<Document> documents = new HashSet<Document>();
public Tag(){}
//getter and setter...
}
And a class Document clasified by some tags object 并且一个类文档被一些标签对象分类
public class Document {
private Long id;
private String title;
private Int numberPages;
private Set<Tag> tags = new HashSet<Tag>();
public Document(){}
//getter and setter...
}
And now I would like get documents with a 10 pages maximun and they have tags "short" OR "essay" 现在我想获得10页最大的文件,他们有“短”或“论文”的标签
I guess something like: 我猜是这样的:
int nPages = 10;
Query query = session.createQuery("from Document where nPages <= :numberPages and (<<short>> OR <<essay>>);
query.setInteger("numberPages", nPages);
The list of tags could be variable. 标签列表可以是变量。 And I would like differentiate when have to be all tags ("AND" between tags) or with any tag is enough ("OR" between tags) 我想区分何时必须是所有标签(标签之间的“AND”)或任何标签就足够了(标签之间的“OR”)
How can I build the sql statement? 如何构建sql语句?
I think your HQL
should look like below: 我认为您的HQL
应如下所示:
Query query = session.createQuery(
"from Document d join d.tags t "+
" where d.nPages <= :numberPages and "+
" t.title in (:titles) ";
List<String> titles = new ArrayList<String>();
titles.add("short");
titles.add("essay");
query.setParameter("numberPages", nPages);
query.setParameterList("titles", titles);
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