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我想一個NativeQuery的結果映射到非實體POJO,使用SqlResultSetMapping
和ConstructorResult
類轉換異常使用SqlResultSetMapping和ConstructorResult
我使用這個StreetCity
類,用結果映射:
@Data
@SqlResultSetMapping(name = "StreetCityResult", classes = {
@ConstructorResult(targetClass = StreetCity.class, columns = {
@ColumnResult(name = "street", type = String.class),
@ColumnResult(name = "city", type = String.class) }) })
public class StreetCity {
public String street;
public String city;
public StreetCity(String street, String city) {
this.street = street;
this.city = city;
}
}
這是執行NativeQuery
public List<StreetCity> retrieveStreetCity(String zipCode, int houseNumber) {
Query query = em.createNativeQuery(getLocationQuery(zipCode, houseNumber), "StreetCityResult");
List<StreetCity> streetCityList = query.getResultList();
return streetCityList;
}
這是應該是前查詢功能cuted
public String getLocationQuery(String zipCode, int houseNumber) {
String query =
"select straat.straatnaam as street, plaats.plaatsnaam as city "
+ " from pcreeks "
+ " left join plaats on plaats.plaatsid = pcreeks.plaatsid "
+ " left join straat on straat.straatid = pcreeks.straatid "
+ " where (...) ";
return query;
}
但我仍然得到一個異常
2017-03-05T16:35:57.736+0100|Warning: javax.ejb.EJBException
Caused by: java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to nl.xxx.service.business.locations.entity.StreetCity
編輯: 錯誤來源於此代碼的第2行:
List<StreetCity> streetCityList = storage.retrieveStreetCity(zipCode, houseNumber);
streetCityList.get(0).getStreet();
甲骨文有exact same example in the javadoc,所以我究竟做錯了什麼?
限制1是無效的oracle語法 – BobC
真的,我忘了刪除它初始化,但沒有限制1,重新sult是相同的 –
這也許help.'http://stackoverflow.com/questions/26375565/jpa-2-1-constructorresult-causing-classcastexception' –