springboot中@NamedQuery查詢結果出現死迴圈
阿新 • • 發佈:2018-11-07
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我們可以看到,結果為死迴圈
附上程式碼:
controller:
@RequestMapping("/getStuByClazzName")
public List<Student> getStuByClazzName(String clazzName) {
return schoolService.getStuByClazzName(clazzName);
}
Repository:
List<Student> getStuByClazzName(String clazzName);
domain:
@Entity @Table(name="tb_student") @NamedQuery(name="Student.getStuByClazzName", query="select s from Student s where s.clazz.name like ?1") public class Student implements Serializable{
service:
public List<Student> getStuByClazzName(String clazzName) {
return studentRepository.getStuByClazzName("%"+clazzName+"%");
}
原因:問題出現在controller層,因為首先需要呼叫班級名(因為方法名為是*ByClazzName),而班級裡會有學生,學生又會呼叫班級,以此類推,出現死迴圈
解決方法:在controller層的返回值進行改變,不直接返回Student型別,而是新建一個list<String>集合,進行返回,此時只返回name
結果:
["諸葛亮","觀音"]
解決