JSONレスポンスと共にカラム名を取得

Question

私は3つのエンティティクラスを持っていますが、私は2つのテーブルの結合を含むクエリを書いています。

表：ExpensesCategories

@Entity 
@Table(name = "ExpensesCategories") 
public class ExpensesCategories { 

    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    @Column(name = "category_id", unique = true) 
    private int categoryId; 

    @NotNull 
    private String categoryName; 

    @NotNull 
    private String categoryCodeInBankStats; 

    public int getCategoryId() { 
     return categoryId; 
    } 

    public void setCategoryId(int categoryId) { 
     this.categoryId = categoryId; 
    } 

    public String getCategoryName() { 
     return categoryName; 
    } 

    public void setCategoryName(String categoryName) { 
     this.categoryName = categoryName; 
    } 

    public String getCategoryCodeInBankStats() { 
     return categoryCodeInBankStats; 
    } 

    public void setCategoryCodeInBankStats(String categoryCodeInBankStats) { 
     this.categoryCodeInBankStats = categoryCodeInBankStats; 
    } 
} 

表：取引

@Entity 
@Table(name = "TransactionHistory") 
public class TransactionHistory { 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    private int id; 

    @Temporal(TemporalType.DATE) 
    private Date dateOfTransaction; 

    private String transactionType; 

    private String refNo; 

    private Date valueDate; 

    private double withdrawalAmount; 

    private double depositAmount; 

    private double closingBalance; 

    @ManyToOne 
    @JoinColumn(name="userDetailsId", referencedColumnName="user_id") 
    private UserDetails userDetails; 

    @ManyToOne 
    @JoinColumn(name="expenseCategoriesId", referencedColumnName="category_id") 
    private ExpensesCategories expenseCategories; 

    public TransactionHistory(int userId, Date dateOfTransaction, String transactionType, String refNo, Date valueDate, 
      double withdrawalAmount, double depositAmount, double closingBalance) { 
     this.dateOfTransaction = dateOfTransaction; 
     this.transactionType = transactionType; 
     this.refNo = refNo; 
     this.valueDate = valueDate; 
     this.withdrawalAmount = withdrawalAmount; 
     this.depositAmount = depositAmount; 
     this.closingBalance = closingBalance; 
    } 

    public TransactionHistory() { 
    } 

    public Date getDateOfTransaction() { 
     return dateOfTransaction; 
    } 

    public void setDateOfTransaction(Date date) { 
     this.dateOfTransaction = date; 
    } 

    public String getTransactionType() { 
     return transactionType; 
    } 

    public void setTransactionType(String transactionType) { 
     this.transactionType = transactionType; 
    } 

    public String getRefNo() { 
     return refNo; 
    } 

    public void setRefNo(String refNo) { 
     this.refNo = refNo; 
    } 

    public Date getValueDate() { 
     return valueDate; 
    } 

    public void setValueDate(Date valueDate) { 
     this.valueDate = valueDate; 
    } 

    public double getWithdrawalAmount() { 
     return withdrawalAmount; 
    } 

    public void setWithdrawalAmount(double withdrawalAmount) { 
     this.withdrawalAmount = withdrawalAmount; 
    } 

    public double getDepositAmount() { 
     return depositAmount; 
    } 

    public void setDepositAmount(double depositAmount) { 
     this.depositAmount = depositAmount; 
    } 

    public double getClosingBalance() { 
     return closingBalance; 
    } 

    public void setClosingBalance(double closingBalance) { 
     this.closingBalance = closingBalance; 
    } 

    public UserDetails getUserDetails() { 
     return userDetails; 
    } 

    public void setUserDetails(UserDetails userDetails) { 
     this.userDetails = userDetails; 
    } 

    public int getId() { 
     return id; 
    } 

    public void setId(int id) { 
     this.id = id; 
    } 

    public ExpensesCategories getExpenseCategories() { 
     return expenseCategories; 
    } 

    public void setExpenseCategories(ExpensesCategories expenseCategories) { 
     this.expenseCategories = expenseCategories; 
    } 
} 

表：ユーザの詳細

@Entity 
@Table(name = "Employee") 
public class UserDetails { 

    @Id 
    @Column(name = "user_id", unique = true) 
    private int id; 
    @NotNull 
    private String firstname; 
    @NotNull 
    private String lastname; 
    @Column(unique = true) 
    @NotNull 
    private String emailaddress; 
    @NotNull 
    private String role; 



    public UserDetails(String firstname, String lastname, String emailaddress, String role) { 
     this.firstname = firstname; 
     this.lastname = lastname; 
     this.emailaddress = emailaddress; 
     this.role = role; 
    } 

    public int getId() { 
     return id; 
    } 

    public void setId(int id) { 
     this.id = id; 
    } 

    public UserDetails() { 
    } 

    public String getFirstname() { 
     return firstname; 
    } 

    public void setFirstname(String firstname) { 
     this.firstname = firstname; 
    } 

    public String getLastname() { 
     return lastname; 
    } 

    public void setLastname(String lastname) { 
     this.lastname = lastname; 
    } 

    public String getEmailaddress() { 
     return emailaddress; 
    } 

    public void setEmailaddress(String emailaddress) { 
     this.emailaddress = emailaddress; 
    } 

    public String getRole() { 
     return role; 
    } 

    public void setRole(String role) { 
     this.role = role; 
    } 

    @Override 
    public String toString() { 
     return "Employee [id=" + id + ", firstname=" + firstname + ", lastname=" + lastname + ", emailaddress=" 
       + emailaddress + ", role=" + role + "]"; 
    } 

transactionエンティティに次のようなクエリを書きました。

@Query(nativeQuery=true, value="SELECT a.expense_categories_id, a.Total_withdrawal_Amount, b.category_code_in_bank_stats, b.category_name FROM (SELECT expense_categories_id , SUM(withdrawal_amount) AS Total_withdrawal_Amount FROM transaction_history GROUP BY expense_categories_id) a join expenses_categories b on a.expense_categories_id = b.category_id 

") 
     List<Object[]> getCategorizedExpenses(); 

私Json応答は次のようである：

[ 
    [ 
     1, 
     21, 
     "UPI", 
     "UPI Payments" 
    ], 
    [ 
     2, 
     3733.59, 
     "POS", 
     "Shopping" 
    ] 
] 

しかし、私は同様に、列名を持つJSONレスポンスをしたい：

[ 
    [ 
     expense_categories_id: 1, 
     Total_withdrawal_Amount: 21, 
     category_code_in_bank_stats: "UPI", 
     category_name: "UPI Payments" 
    ], 
    [ 
     expense_categories_id: 2, 
     Total_withdrawal_Amount: 3733.59, 
     category_code_in_bank_stats: "POS", 
     category_name: "Shopping" 
    ] 
] 

私を助けてください..

Answer 1

あなたでしょうPOJOクラスに直接結果をマップする必要があります。json config：

1） POJO

public ResultClass implements Serializable{ 

    @JsonProperty("expense_categories_id") 
    private Integer expenseCategoriesId; 

    ... 

    public ResultClass(Integer expenseCategoriesId ... // rest params){ 
     this.expenseCategoriesId = expenseCategoriesId; 
     ... 
    } 
} 

2）マッピングを定義定義：

@SqlResultSetMapping(
    name="myMapping", 
    classes={ 
     @ConstructorResult(
      targetClass=ResultClass.class, 
      columns={ 
       @ColumnResult(name="expenseCategoriesId"), 
       @ColumnResult(name="totalWithdrawalAmount") 
       // further mappings ... 
      } 
     ) 
    } 
) 

3）ネイティブクエリの定義を

@NamedNativeQuery(name="TransactionHistory.myQuery" 
    , query="SELECT new mypackage.ResultClass(a.expense_categories_id as expeneCategoriesId ...) from ...") 

4）は@Query注釈なしCrudRepositoryでこのメソッドを定義します。

public List<ResultClass> myQuery(); 

テー@SqlResultSetMappingと@NamedNativeQueryをごマッピングされたエンティティの1に定義する必要があります。

Answer 2

あなたのネイティブクエリーではobject[][]が得られます。したがって、実際にはmxnの行です。 だから、私はあなたがResponse

public class Response{ 

    private Long expense_categories_id; 
    private Double Total_withdrawal_Amount; 
    private String category_code_in_bank_stats; 
    private String category_name; 


    //getters and setters for all attributes 

} 



List<Response> fillCategorizedExpenses(){ 
    List<Response> response_List = new ArrayList<>(); 
    Response response = null; 
    Object[][] // fill each object with by accessing their index from 
       //this array. 
    for() //iterate the object array. { 
     response = new Response(); 
     response.setExpense_categories_id(value); // set all attributes. 
     .... 
     .... 
     .... 
     response_List.add(response); 
    } 
    return response_List; //this will print as you need in your project. 

} 

クラス名を作成するべきだと思い はありがとうございました:)これはあなたを助けるかもしれない願っています。