@TableField(fill = FieldFill.INSERT_UPDATE）不生效原因之以存在值

前提条件

@TableField(fill = FieldFill.INSERT_UPDATE)

@Component
public class MyMetaObjectHandler implements MetaObjectHandler {

    @Override
    public void insertFill(MetaObject metaObject) {
        this.strictInsertFill(metaObject, "createTime", LocalDateTime.class, LocalDateTime.now());
        this.strictInsertFill(metaObject, "updateTime", LocalDateTime.class, LocalDateTime.now());
        this.strictInsertFill(metaObject, "createBy", Integer.class, getCurrentUserId());
        this.strictInsertFill(metaObject, "updateBy", Integer.class, getCurrentUserId());
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        this.strictUpdateFill(metaObject, "updateTime", LocalDateTime.class, LocalDateTime.now());
        this.strictUpdateFill(metaObject, "updateBy", Integer.class, getCurrentUserId());
    }
}

解决方法

 @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("updateTime", LocalDateTime.now(), metaObject);
        //this.strictUpdateFill(metaObject, "updateTime", LocalDateTime.class, LocalDateTime.now());
        this.strictUpdateFill(metaObject, "updateBy", Integer.class, getCurrentUserId());
    }

使用this.strictInsertFill()和this.strictupdateFill()方法的时候，当当前设置的字段有值的时候，不会对其进行数据的填充。
以下是底层源码

default MetaObjectHandler strictFillStrategy(MetaObject metaObject, String fieldName, Supplier<?> fieldVal) {
        if (metaObject.getValue(fieldName) == null) {
            Object obj = fieldVal.get();
            if (Objects.nonNull(obj)) {
                metaObject.setValue(fieldName, obj);
            }
        }
        return this;
    }