Mybatis-Plus将字段设置为null解决方法

mybatis-plus:
  mapper-locations: classpath:/mapper*.xml
  typeAliasesPackage: com.test.application.test.admin.entity
  global-config:
    #主键类型  0:"数据库ID自增", 1:"用户输入ID",2:"全局唯一ID (数字类型唯一ID)", 3:"全局唯一ID UUID";
    id-type: 0
    #字段策略 0:"忽略判断",1:"非 NULL 判断"),2:"非空判断"
    field-strategy: 0
    #驼峰下划线转换
    db-column-underline: true
    #刷新mapper 调试神器
    refresh-mapper: true
    #数据库大写下划线转换
    #capital-mode: true
  configuration:
    map-underscore-to-camel-case: true
    cache-enabled: true
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

@TableField(insertStrategy = FieldStrategy.IGNORED, updateStrategy = FieldStrategy.IGNORED)
private String name;

或者单个的例子:

@TableField(updateStrategy = FieldStrategy.IGNORED)
private String username;

//updateAllColumnById(entity) // 全部字段更新: 3.0已经移除
mapper.update(
  new User().setName("mp").setAge(3),
  Wrappers.<User>lambdaUpdate()
          .set(User::getEmail, null) //把email设置成null
          .eq(User::getId, 2)
);

// 也可以参考下面这种写法
mapper.update(
   null,
   Wrappers.<User>lambdaUpdate()
      .set(User::getAge, 3)
      .set(User::getName, "mp")
      .set(User::getEmail, null) // 把email设置成null
      .eq(User::getId, 2)
);