Question

我正在获取重复记录。

我有两张表Customer，Address

在Customer.java中

    @Entity
    @Table(name = "customer", uniqueConstraints = { @UniqueConstraint(columnNames = { "customer_id" }) })
    @JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
    @NamedQuery(name = "Customer.findAll", query = "SELECT c FROM Customer c")
    public class Customer implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "customer_id")
    private long customerId;

    @OneToMany(mappedBy = "customer", fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @Column(nullable = true)
    @JsonManagedReference
    private List<Address> addresses;

在Address.java中

    @Entity
    @Table(name = "address", uniqueConstraints = { @UniqueConstraint(columnNames = { "account_id" }) })
    @JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
    public class Address implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "account_id")
    private long accountId;

    @ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @JoinColumn(name = "customer_id")
    @JsonBackReference
    private Customer customer;

表格是：客户表：

CREATE TABLE `customer` (
  `customer_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
  `user_name` varchar(45) NOT NULL,
  `password` varchar(45) NOT NULL,
  `encrypt_key` varchar(200) NOT NULL,
  `theme_id` smallint(5) unsigned NOT NULL,
  `first_name` varchar(45) NOT NULL,
  `last_name` varchar(45) NOT NULL,
  `email` varchar(50) DEFAULT NULL,
  `active` tinyint(1) NOT NULL DEFAULT '1',
  `last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `self_description` varchar(2000) NOT NULL,
  PRIMARY KEY (`customer_id`),
  KEY `idx_last_name` (`last_name`)
) ENGINE=InnoDB AUTO_INCREMENT=101 DEFAULT CHARSET=utf8;

地址表：

CREATE TABLE `address` (
  `account_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
  `customer_id` smallint(5) unsigned NOT NULL,
  `address_type` varchar(15) NOT NULL,  -- Office, Branch-1, Branch-2, 
  `door_num` varchar(50) NOT NULL,
  `landmark` varchar(150) DEFAULT NULL,
  `street` varchar(50) DEFAULT NULL,
  `area_name` varchar(25) NOT NULL,
  `district` varchar(25) NOT NULL,
  `city` varchar(25) NOT NULL,
  `postal_code` varchar(10) DEFAULT NULL,
  `phone1` varchar(20) NOT NULL,
  `phone2` varchar(20),
  `last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`account_id`),
  KEY `idx_fk_city` (`city`),
  CONSTRAINT `fk_customer_id` FOREIGN KEY (`customer_id`) REFERENCES `customer` (`customer_id`) ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=201 DEFAULT CHARSET=utf8;

获取重复记录：

{
  "customerId": 101,
  "active": 1,
  "email": "bbb@gmail.com",
  "encryptKey": "wwwwwfsad",
  "firstName": "aaa",
  "lastName": "bbb",
  "password": "user1",
  "selfDescription": "user1",
  "userName": "user1",
  "addresses": [
    {
      "accountId": 201,
      "addressType": "main office",
      "areaName": "area1",
      "city": "city1",
      "district": "district1",
      "doorNum": "89",
      "landmark": "landmark1",
      "phone1": "646432365465",
      "phone2": "4534542355675",
      "postalCode": "453245",
      "street": "street1"
    },
    {
      "accountId": 201,
      "addressType": "main office",
      "areaName": "area1",
      "city": "city1",
      "district": "district1",
      "doorNum": "89",
      "landmark": "landmark1",
      "phone1": "646432365465",
      "phone2": "4534542355675",
      "postalCode": "453245",
      "street": "street1"
    },
    {
      "accountId": 202,
      "addressType": "main office",
      "areaName": "area2",
      "city": "city2",
      "district": "district2",
      "doorNum": "89",
      "landmark": "landmark2",
      "phone1": "453454675",
      "phone2": "53425324",
      "postalCode": "7457646432",
      "street": "street2"
    },
    {
      "accountId": 202,
      "addressType": "main office",
      "areaName": "area2",
      "city": "city2",
      "district": "district2",
      "doorNum": "89",
      "landmark": "landmark2",
      "phone1": "453454675",
      "phone2": "53425324",
      "postalCode": "7457646432",
      "street": "street2"
    }
  ],
  "customerOptions": [
    {
      "id": {
        "questionId": 501,
        "customerId": 101,
        "optionId": 601
      }
    },
    {
      "id": {
        "questionId": 502,
        "customerId": 101,
        "optionId": 603
      }
    },
    {
      "id": {
        "questionId": 501,
        "customerId": 101,
        "optionId": 601
      }
    },
    {
      "id": {
        "questionId": 502,
        "customerId": 101,
        "optionId": 603
      }
    }
  ]
}

Answer 1

答案非常简单，但经过长时间的斗争后才发现。那就是：

我将所有List字段转换为所有实体类中的Set字段。

JPA - 重复记录

1 个答案: