java - 无法在JPA中进行子查询

Question

String query = "select t from myTable t where t.idOne = " + myId
+ " AND t.idTwo = " + myIdTwo
+ " AND t.idThree = " + myIdThree
+  "AND t.idFour = (select max(t.idFour) from t)";

所以 myTable 有一个列，我需要从中获取 MAX id 并在查询中使用它。

最后一行给了我一个错误:

Error while running query: An exception occurred while creating a query in EntityManager:
java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager: Exception Description: Syntax error parsing [query from above]. [214, 214] An identification variable must be provided for a range variable declaration.

Answer 1

看起来就像你犯了错误。 您的模式中是否有表t？如果不是，您应该指定表名称而不是别名。

String query = "select t from myTable t where t.idOne = " + myId
+ " AND t.idTwo = " + myIdTwo
+ " AND t.idThree = " + myIdThree
+  "AND t.idFour = (select max(st.idFour) from myTable st)";