Question

我遇到了带有JPQL的子查询问题，Criteria也出现了同样的错误。查询返回语法错误：

Encountered "," javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not prepare statement.

JPQL

StringBuilder query = new StringBuilder("SELECT d FROM Document d WHERE NOT EXISTS (SELECT ds FROM Documents ds WHERE d = ds.key.document)"); 
TypedQuery<Documento> tQuery = entityManager.createQuery(query.toString());
List<Document> documents = tQuery.getResultList();

标准

    CriteriaBuilder cb = entityManager.getCriteriaBuilder();
    CriteriaQuery<Document> query = cb.createQuery(Document.class);

    Root<Document> root = query.from(Document.class);
    CriteriaQuery<Document> select = query.select(root);

    Subquery<Documents> sQuery = query.subquery(Documents.class);
    Root<Documents> rootSubquery = sQuery.from(Documents.class);
    Predicate p = cb.equal(rootSubquery.get("key").get("document"), root);
    sQuery.select(rootSubquery);
    sQuery.where(p);
    select.where(cb.not(cb.exists(sQuery)));
    TypedQuery<Documento> tQuery = entityManager.createQuery(query);
    List<Document> documents = tQuery.getResultList();

Answer 1

查询似乎是正确的。但是@RequestMapping(value = "/api/" + REST_API_VERSION + "/" + ONE_INTERFACE, method = RequestMethod.GET, produces ={MediaType.APPLICATION_JSON_VALUE}) @ResponseBody public String pmmSearch() { ... }这个词在德比中是一个保留词。那应该是原因。因此，您最好在KEY实体中重命名此属性。

Answer 2

我不知道它是否是一个错误，或者应该是这样，但是我在子查询的列中指定了一个复合键，它是受影响的键，它可以工作。这种情况只发生在其他选择的子查询中我没有遇到过这个错误

变化：

<强> JPQL

StringBuilder query = new StringBuilder("SELECT d FROM Document d WHERE NOT EXISTS (SELECT ds.key.document FROM Documents ds WHERE ds.key.document = d)");

<强>标准

...
Subquery<Documents> sQuery = query.subquery(Documents.class);
Root<Documents> rootSubquery = sQuery.from(Documents.class);
Predicate p = cb.equal(rootSubquery.get("key").get("document"), root);
sQuery.select(rootSubquery.get("key").get("document"));
sQuery.where(p);
select.where(cb.not(cb.exists(sQuery)));
...

JPA子查询语法错误

2 个答案: