Thymeleaf：在同一頁上顯示來自兩個JPA實體表的數據

Question

我正在使用Spring Boot，Thymeleaf，Hibernate和JPA來開發此應用程序。我已經映射了我需要從中檢索數據的兩個實體之間的關係，並且想知道如何顯示客戶查看其訂單的頁面上的兩個表中的數據。

在我的控制器類中，我將對象"viewmyorders"添加到ModelAndView，它將包含來自兩個表/實體的HQL查詢的結果。我應該在Thymeleaf模板上使用什麼語法來在頁面上顯示數據？這兩個表格的結果是否會以 "${viewmyorder.}"？在"."之後 - 數據庫中相關列的名稱？

幫助感謝！

訂單類別：

@Entity 
@Table(name = "orders") 
public class Orders { 

@Id 
@GeneratedValue(strategy = GenerationType.AUTO) 
@Column(name = "orderno") 
private int id; 

@Column(name = "item_name") 
private String itemName; 

@Column(name = "description") 
private String itemDescription; 

@Column(name = "cost") 
private String cost; 

@OneToOne(cascade = CascadeType.ALL) 
@JoinColumn(name = "orderId") 
private Customer customerInfo; 

//getters and setters 
} 

Customer類：

@Entity 
@Table(name = "customer") 
public class Customer { 

@Id 
@GeneratedValue(strategy = GenerationType.AUTO) 
@Column(name = "cust_id") 
private int cust_id; 

@Column(name = "fName") 
private String firstName; 

@Column(name = "surName") 
private String surName; 

@Column(name = "address") 
private String address; 

@Column(name = "phone") 
private String phone; 

@Column(name = "orderId") 
private int orderId; 

@Column(name = "active") 
private int isactive; 

@OneToOne(mappedBy="customerInfo") 
private Orders orderInfo; 

//getters and setters 
} 

庫類：

public interface OrderRepository extends JpaRepository<Orders, Integer> { 

//customerInfo is the object (of type orders) which maps the relationship between the two entities 
String MYORDERQUERY = "SELECT ord, cust from Orders ord inner join ord.customerInfo cust"; 

@Query(MYSWAPSQUERY) 
List<Orders> findMyOrders();  
} 

控制器方法：

@RequestMapping(value={"/viewmyorders"}, method = RequestMethod.GET) 
public ModelAndView viewOrders(){ 
    ModelAndView modelAndView = new ModelAndView(); 
    //orderService calls method above from Repository class to return order info 
    modelAndView.addObject("viewmyorders", orderService.listAllOrders()); 
    return modelAndView; 
} 

表Thymeleaf模板頁：

    <table class="table table-striped"> 
         <tr> 
          <th>Order Number</th> 
          <th>Product Description</th> 
          <th>Delivery Address</th> 
          <th>Contact Number</th> 
         </tr> 
         <tr th:each="viewmyorder : ${viewmyorders}"> 
          <td th:text="${viewmyorder.orderno}"></td> 
          <td th:text="${viewmyorder.description}"></td> 
          <td th:text="${viewmyorder.address}"></td> 
          <td th:text="${viewmyorder.phone}"></td> 
         </tr>      
        </table> 

Answer 1

您將能夠達到您的訂單對象具有的屬性，因爲你的服務類返回的訂單列表，通過這個列表循環，當你viewmyorder將具有相同的屬性因爲你的訂單有。

有關語法，引用：http://www.thymeleaf.org/doc/articles/springmvcaccessdata.html#spring-model-attributes

Answer 2

如果您Orders實體具有Customer領域，例如

@Entity 
class Orders { 
    ... 
    @OneToOne 
    @JoinColumn(name = "customer_id") 
    private Customer customer; 
    ... 
} 


@Entity 
class Customer { 
    ... 
    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    @Column(name = "customer_id") 
    @NotNull 
    private Long id; 
    ... 
    @OneToOne(mappedBy = "customer") 
    private Orders orders; 
    ... 
} 

那麼你OrderRepository的findAll()方法使Orders實體將包含Customer數據以及列表。您可以像在控制器中那樣將該列表傳遞給您的Thymeleaf模板，然後參考Customer數據。 ${viewmyorders.customer.address}

編輯： 課程不僅findAll()但返回Orders實體的所有列將包含Customer數據的查詢，自定義查詢的結果了。

編輯＃2： 我想你想somethink這樣的： 數據庫模式和實體：

CREATE TABLE orders (
    order_id INT NOT NULL, 
    item_name VARCHAR(20), 
    description VARCHAR(50), 
    cost  VARCHAR(20) 
); 


CREATE TABLE customer (
    cust_id INT   NOT NULL, 
    fName  VARCHAR(20), 
    surName VARCHAR(20), 
    address  VARCHAR(50), 
    phone  VARCHAR(15), 
    active INT, 
    order_id INT, 
    FOREIGN KEY (order_id) REFERENCES orders (order_id) 
); 



@Entity 
@Table(name = "orders") 
public class Orders { 

@Id 
@GeneratedValue(strategy = GenerationType.AUTO) 
@Column(name = "order_id") 
private int id; 

@Column(name = "item_name") 
private String itemName; 

@Column(name = "description") 
private String itemDescription; 

@Column(name = "cost") 
private String cost; 

@OneToOne(mappedBy = "orderInfo", cascade = CascadeType.ALL) 
private Customer customerInfo; 

//getters and setters 
} 



@Entity 
@Table(name = "customer") 
public class Customer { 

@Id 
@GeneratedValue(strategy = GenerationType.AUTO) 
@Column(name = "cust_id") 
private int cust_id; 

@Column(name = "fName") 
private String firstName; 

@Column(name = "surName") 
private String surName; 

@Column(name = "address") 
private String address; 

@Column(name = "phone") 
private String phone; 

@Column(name = "active") 
private int isactive; 

@OneToOne 
@JoinColumn(name = "order_id") // This will map the primary key of orders table to the column named order_id in customer table (see SQL above), you do not need to create a field for it in java entity 
private Orders orderInfo; 
// Later you can reference order_id through a Customer like customer.getOrderInfo().getId(); 

//getters and setters 

}