具有集合查询的JPA多个实体

Question

我在SQL中具有以下内容：

SELECT * FROM table2 t2, table1 t1 WHERE t1.id=1 AND t2.t1_id IN(1, 2);

我将如何在JPA中做到这一点？

我试过了：

SELECT t2 FROM Table2 t2, Table1 t1 WHERE t1.id = :t1_id AND t2.t1 IN (t1.t1Collection)

使用伪类：

Table1
  private int id;
  private Collection<Table1> t1Collection;

Table2
  private int t2;
  private Table1 t1_id;

但是我得到：

org.hibernate.exception.SQLGrammarException: could not execute query; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query

Answer 1

尝试使用elements关键字：

SELECT t2 FROM Table2 t2, Table1 t1 WHERE t1.id = :t1_id AND t2.t1 IN elements(t1.t1Collection)