我有一个这样的实体:
@Entity
@Table(name = "QUESTION_GROUP_TEXT")
@NamedQueries({
@NamedQuery(
name = EntityUtils.NamedQuery.UPDATE_QUESTION_GROUP_TEXT,
query = "UPDATE QuestionGroupText T SET T.localizedText.content = :content WHERE T.generatedId = :generatedId")
})
public class QuestionGroupText implements Serializable {
@Column(name = "GENERATED_ID", nullable = false, unique = true)
private String generatedId = generateId();
@ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
@JoinColumn(name = "LOCALIZED_TEXT_ID", nullable = false)
private LocalizedText localizedText;
//Getters and setters
}
此查询:UPDATE QuestionGroupText T SET T.localizedText.content = :content WHERE T. generatedId = : generatedId 不起作用，它会抛出:
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'set CONTENT='Question Label' where GENERATED_ID='AD78F9B5E2A146D9AB9D94096DA835B' at line 1
查询的这一部分一定有问题:T.localizedText.content，有什么方法可以更改它以使其正常工作吗？
最佳答案
我能够重写我需要的查询:
UPDATE LocalizedText L SET L.content = :content WHERE EXISTS (SELECT T FROM QuestionGroupText T WHERE T.localizedText.id = L.id AND T.generatedId = :generatedId)
关于java - JPQL 更新查询，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19443888/