Java Spring crudepository Save For Update覆盖其他字段
我在我的项目中使用crudepository进行数据库操作。当我用Spring实现的save方法更新持久化数据时,其他字段被覆盖。例如,我只发送firstName进行更新,但lastName被转换为空字段 简单地说,我使用如下实体调用save方法:Java Spring crudepository Save For Update覆盖其他字段,java,spring,spring-boot,spring-data,Java,Spring,Spring Boot,Spring Data,我在我的项目中使用crudepository进行数据库操作。当我用Spring实现的save方法更新持久化数据时,其他字段被覆盖。例如,我只发送firstName进行更新,但lastName被转换为空字段 简单地说,我使用如下实体调用save方法: memberRepository.save(memberForUpdate); 我将此JSON发送到更新方法: {"id":2,"firstName": "Rubens","lastName": "Barichello"} Spring将此JSO
memberRepository.save(memberForUpdate);
我将此JSON发送到更新方法:
{"id":2,"firstName": "Rubens","lastName": "Barichello"}
Spring将此JSON转换为RESTAPI端点处的成员。Member.java是:
package com.ilkaygunel.entities;
import java.time.LocalDateTime;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonInclude.Include;
@Entity
@JsonInclude(Include.NON_NULL)
public class Member {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
private String firstName;
private String lastName;
private String email;
private boolean enabled;
private String password;
private String memberLanguageCode;
private String activationToken;
private LocalDateTime activationTokenExpDate;
@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "id")
private MemberRoles roleOfMember;
@Override
public String toString() {
return String.format("Member [id=%d, firstName='%s', lastName='%s', email='%s']", id, firstName, lastName,
email);
}
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 boolean isEnabled() {
return enabled;
}
public void setEnabled(boolean enabled) {
this.enabled = enabled;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public MemberRoles getRoleOfMember() {
return roleOfMember;
}
public void setRoleOfMember(MemberRoles roleOfMember) {
this.roleOfMember = roleOfMember;
}
public String getActivationToken() {
return activationToken;
}
public void setActivationToken(String activationToken) {
this.activationToken = activationToken;
}
public LocalDateTime getActivationTokenExpDate() {
return activationTokenExpDate;
}
public void setActivationTokenExpDate(LocalDateTime activationTokenExpDate) {
this.activationTokenExpDate = activationTokenExpDate;
}
public String getMemberLanguageCode() {
return memberLanguageCode;
}
public void setMemberLanguageCode(String memberLanguageCode) {
this.memberLanguageCode = memberLanguageCode;
}
}
如何防止重写其他字段并仅更新已发送的字段?save方法本身的行为类似于saveorUpdate,因此这里的问题在于您的代码 您所做的只是设置一些值,而不是其他值。因此,当您向spring发送部分json时,它会将其他值设置为默认值。现在的问题是,null是数据库中的有效值。因此,Crudepository正在更新所有值以及null值,因为它认为您希望使用对象中的值更新数据库。考虑一下你的场景: 发送给Spring的Json:
{“id”:2,“firstName”:“Rubens”,“lastName”:“Barichello”}
Spring生成的对象:
private long id=2;
private String firstName="Rubens";
private String lastName="Barichello";
private String email=null;
private boolean enabled=false;
private String password=null;
private String memberLanguageCode=null;
private String activationToken=null;
private LocalDateTime activationTokenExpDate=null;
因此,您应该使用findById(ID)方法获取对象,设置值,然后调用save(S entity)方法
例如
通过检索实体,更新修改的字段,然后保存实体。当您调用.save(object)时,整个对象被持久化,没有“魔力”。您必须手动处理它以部分更新现有的ObjectObject,但是,当我提供要保存的id时,它是否应该更新持久化的数据?我无法理解为什么它的行为像是坚持而不是更新。他怎么知道哪个领域需要更新?基于什么?没有魔法。框架无法猜测需要更新的内容,您可能希望更新文档以推送null
memberfromspring;
memberforupdate= memberRepository.findById(memberfromspring.getId());
memberforupdate.setFirstName(memberfromspring.getFirstName());
memberforupdate.setLastName(memberfromspring.getLastName());
memberRepository.save(memberForUpdate);