Question

我想在Spring Boot中使用以下json字符串创建模型。

{
  "name": "inox",
  "seatInfo": {
    "A": {
      "numberOfSeats": 10,
      "aisleSeats": [
        0,
        5,
        6,
        9
      ]
    },
    "B": {
      "numberOfSeats": 15,
      "aisleSeats": [
        0,
        5,
        6,
        9
      ]
    },
    "D": {
      "numberOfSeats": 20,
      "aisleSeats": [
        0,
        5,
        6,
        9
      ]
    }
  }
}

到目前为止，我已经做到了。

 import java.util.Map;
 import javax.persistence.*;

 @Entity
 public class Screen {

     @Id
     @GeneratedValue
     private Long id;
     private String name;
     private Map<String, RowInfo> seatInfo;

     //getter and setters
 }


 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.Id;
 import java.util.Arrays;

 @Entity
 public class RowInfo {

     @Id
     @GeneratedValue
     private Long id;
     private int numberOfSeats;
     private Integer aisleSeats[];

     //getters and setters
 }

应用程序启动时出现以下异常。

嵌套的异常是org.hibernate.MappingException：无法确定类型：java.util.Map，在表：屏幕上，对于列：[org.hibernate.mapping.Column（seat_info）]

Answer 1

使用HashMap类型（或您喜欢的类型）更改Map界面。

@Entity
public class Screen {

     @Id
     @GeneratedValue
     private Long id;
     private String name;
     private HashMap<String, RowInfo> seatInfo;

     //getter and setters
 }


 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.Id;
 import java.util.Arrays;

 @Entity
 public class RowInfo {

     @Id
     @GeneratedValue
     private Long id;
     private int numberOfSeats;
     private Integer aisleSeats[];

     //getters and setters
 }

Answer 2

如果您使用的是JPA 2，请添加：

@ElementCollection

private Map<String, RowInfo> seatInfo;

Answer 3

使用一些JPA 2实现：它添加了@ElementCollection注释，与Hibernate注释类似，完全可以满足您的需求。

@Entity
public class Screen {

    @Id
    @GeneratedValue
    private Long id;
    private String name;
    @ElementCollection
    private Map<String, RowInfo> seatInfo;
}

使用提供的json字符串创建模型

3 个答案: