Springboot自定義選擇查詢返回找不到能夠從類型轉換的轉換器

Question

我正在嘗試在 Springboot JPA 中執行自定義選擇查詢，

public interface idnOauth2AccessTokenRepository extends JpaRepository<idnOauth2AccessToken, String>,
        JpaSpecificationExecutor<idnOauth2AccessToken> {
    @Query(value = "select IOCA.userName, IOCA.appName, IOAT.refreshToken, IOAT.timeCreated, IOAT.tokenScopeHash, IOAT.tokenState, IOAT.validityPeriod from idnOauth2AccessToken IOAT inner join idnOauthConsumerApps IOCA on IOCA.ID = IOAT.consumerKeyID where IOAT.tokenState='ACTIVE'")
    List<userApplicationModel> getUserApplicationModel();
}

但是當我執行我得到一個錯誤

org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [org.springframework.data.jpa.repository.query.AbstractJpaQuery$TupleConverter$TupleBackedMap] to type [com.adl.egw.Model.user.userApplicationModel]

我嘗試了來自互聯網的不同類型的答案，但似乎沒有任何效果。 我還嘗試為 userApplicationModel 實現一個新的存儲庫，但沒有奏效。

任何可以幫助的答案或實施。

Answer 1

您正在連接來自不同表的列，然后分配給不同的對象。 這種方式不起作用+ userApplicationModel似乎不是托管實體。 對於這種情況，您必須使用投影（dto mapping）。 看看下面的Query ：

@Query(value = "select new your.package.UserApplicationModelProjection(IOCA.userName, IOCA.appName, IOAT.refreshToken, IOAT.timeCreated, IOAT.tokenScopeHash, IOAT.tokenState, IOAT.validityPeriod)" 
             + " from idnOauth2AccessToken IOAT inner join idnOauthConsumerApps IOCA on IOCA.ID = IOAT.consumerKeyID where IOAT.tokenState='ACTIVE'")
List<UserApplicationModelProjection> getUserApplicationModel();

以及要映射到的類：

public class UserApplicationModelProjection {
    private String userName;
    private String appName;
    private String refreshToken
    private OffsetDateTime timeCreated
    private String tokenScopeHash;
    private String tokenState; //mind the data type
    private int validityPeriod; //update the data type
    
    public UserApplicationModelProjection(String userName, 
                                        String appName, 
                                        String refreshToken, 
                                        OffsetDateTime timeCreated, 
                                        String tokenScopeHash, 
                                        String tokenState, 
                                        int validityPeriod) 
    {
        this.userName = userName;
        this.appName = appName; 
        this.refreshToken = refreshToken;
        this.timeCreated = timeCreated;
        this.tokenScopeHash = tokenScopeHash; 
        this.tokenState = tokenState;
        this.validityPeriod = validityPeriod;
    }
    
    // Getters only
    
}

檢查此詳細解釋： https : //vladmihalcea.com/the-best-way-to-map-a-projection-query-to-a-dto-with-jpa-and-hibernate/