私は JPQL の初心者ですが、単純な SQL リクエストを JPQL に変換する必要があります: SQL:
SELECT
*,
t.column1 + t.column2 as coefficient
FROM
practice.People as t
ORDER BY coefficient
クラスにマップする方法がわからないため、そのネイティブクエリを使用できません:(私はこのJPQLクエリを使用しようとしています:
SELECT NEW entities.PersonWell(c.peopleId, c.name, c.age, c.height, c.weight, 1)
FROM
People AS c
ORDER BY c.age;
このリクエストで「1」を係数に変更するにはどうすればよいですか? 私が想像した唯一の解決策は、単に使用することです:
SELECT NEW entities.PersonWell(c.peopleId, c.name, c.age, c.height, c.weight, c.age + c.height)
FROM
People AS c
ORDER BY c.age + c.height;
しかし、それが正しい解決策だとは思いません:(どうすればいいですか?
Infragileさん、ご回答ありがとうございます!
しかし、それでも機能しません:(それはあなたの答えを私のコードに適用した結果です:
public List<PersonWell> findWell(People person){
String queryString =
"SELECT\n"
+ "NEW entities.PersonWell(c.peopleId, c.name, c.age, c.height, c.weight, c.speechspeed, "
+ "ABS(c.age - :age) + ABS(c.height - :height) + ABS(c.weight - :weight) + ABS(c.speechspeed - :speechspeed)) AS p \n"
+"FROM "
+ "People AS c\n"
+"ORDER BY p.compatibility DESC";
Query query = em.createQuery(queryString);
query.setParameter("age", person.getAge());
query.setParameter("height", person.getHeight());
query.setParameter("weight", person.getWeight());
query.setParameter("speechspeed", person.getSpeechspeed());
List<PersonWell> resultList = query.getResultList();
return resultList;
}
Ansこれはglassfishサーバーからの回答です:
java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager:
Exception Description: Error compiling the query [SELECT
NEW entities.PersonWell(c.peopleId, c.name, c.age, c.height, c.weight, c.speechspeed, ABS(c.age - :age) + ABS(c.height - :height) + ABS(c.weight - :weight) + ABS(c.speechspeed - :speechspeed)) AS p
FROM People AS c
ORDER BY p.compatibility DESC], line 4, column 9: invalid navigation expression [p.compatibility], cannot navigate expression [p] of type [entities.PersonWell] inside a query.