Question

在模型类中，我有isActive字段，其中是boolean，表示MySql DB中的is_active字段。这是整个模型类：

package ca.gatin.model;

import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

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

    @Id
    @GeneratedValue
    private Long id;

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

    @Column(name = "last_name")
    private String lastName;

    @Column(nullable = false, unique = true)
    private String email;

    @Column(nullable = false)
    private String password;

    @Column(name = "is_active", nullable = false)
    private boolean isActive;

    @Column(name = "date_created")
    private Date dateCreated;

    @Column(name = "date_last_modified")
    private Date dateLastModified;

    public Long getId() {
        return id;
    }

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

    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 getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public boolean isActive() {
        return isActive;
    }

    public void setActive(boolean isActive) {
        this.isActive = isActive;
    }

    public Date getDateCreated() {
        return dateCreated;
    }

    public void setDateCreated(Date dateCreated) {
        this.dateCreated = dateCreated;
    }

    public Date getDateLastModified() {
        return dateLastModified;
    }

    public void setDateLastModified(Date dateLastModified) {
        this.dateLastModified = dateLastModified;
    }

}

但是，当我提取帐户时，请通过REST API说：

@RequestMapping(
        value = "/{id}", 
        method = RequestMethod.GET,
        produces = MediaType.APPLICATION_JSON_VALUE)
public ServiceResponse<Account> getAll(@PathVariable("id") Long id) {
    ServiceResponse<Account> serviceResponse = accountService.getAccountById(id);
    return serviceResponse;
}

在一个回复对象中，我将isActive字段由Hibernate重命名为＆＃34; active＆＃34;像这样：

{
"id": 19,
"firstName": "Julia",
"lastName": "Sarandi",
"email": "julia@gatin.ca",
"password": "111111",
"dateCreated": 1451293826000,
"dateLastModified": null,
"active": true
}

为什么呢？为什么所有其他字段的名称与Account类保持一致，但isActive是否已重命名？

这是一个问题，另一个问题是：我是Hibernate的新手，我不明白为什么在Hibernate DB请求的日志中会显示一些奇怪的查询：

Hibernate: select account0_.id as id1_0_0_, account0_.date_created as date_cre2_0_0_, account0_.date_last_modified as date_las3_0_0_, account0_.email as email4_0_0_, account0_.first_name as first_na5_0_0_, account0_.is_active as is_activ6_0_0_, account0_.last_name as last_nam7_0_0_, account0_.password as password8_0_0_ from Account account0_ where account0_.id=?

它是什么查询语言？什么是符号：＆＃34; 0 _＆＃34;，＆＃34; 0_0 _＆＃34;。我可以切换日志以显示MySQL查询以使其更容易理解吗？

FYI 在我的application.properties文件中，我有以下配置：

spring.jpa.show-sql=true
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
spring.jpa.hibernate.naming-strategy=org.hibernate.cfg.DefaultNamingStrategy

Answer 1

这与Hibernate无关，而且与你的JSON marshaller有关。 Spring使用Jackson，而Jackson使用bean属性（即getter）来访问数据并将它们转换为JSON字段。您的getter名为isActive()，因此对应于名为active的bean属性，因此是JSON中属性的名称。

如果您希望将JSON字段命名为isActive，那么您的getter应为isIsActive()。或者更好，你应该用@JsonProperty("isActive")注释它。

要回答第二个问题，查询是一个由Hibernate生成的SQL查询。它更改表的名称并将别名分配给列主要用于消除歧义表，以及可能具有相同名称的不同表的字段AFAIK。

Answer 2

将isActive字段的getter和setter方法名称更改为：

public boolean getIsActive() {
        return isActive;
    }

    public void setIsActive(boolean isActive) {
        this.isActive = isActive;
    }

然后它返回isActive作为回应。

为什么JPA Hibernate会更改字段的名称？

2 个答案: