mybatis-plus 学习内容

//自动填充
    @TableField(fill = FieldFill.INSERT)
    private Date createTime;
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Date updateTime;

public class MyDataHandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
        this.setFieldValByName("createTime",new Date(),metaObject);
        this.setFieldValByName("updateTime",new Date(),metaObject);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("updateTime",new Date(),metaObject);
    }
}

//配置乐观锁
    @Bean
    public OptimisticLockerInterceptor optimisticLockerInterceptor() {
        return new OptimisticLockerInterceptor();
    }
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }

//乐观锁
    @Version
    private Integer version;

 QueryWrapper<User> userQueryWrapper = new QueryWrapper<>();
        userQueryWrapper.isNotNull("name")
                .isNotNull("age")
                .eq("age",21);

 List<User> users = userMapper.selectList(userQueryWrapper);