schema:
                type: object
                properties:
                  query_time:
                    type: integer
                    format: int64
                    example: 18
                  record_count:
                    type: integer
                    example: 355
                  page_size:
                    type: integer
                    example: 10

		t.Skip()
	}

	// TiDB can't change column constraint and has auto_random feature
	type ColumnStruct struct {
		ID    int `gorm:"primarykey;default:auto_random()"`
		Name  string
		Age   int    `gorm:"default:18;comment:my age"`
		Code  string `gorm:"unique;comment:my code;"`
		Code2 string
		Code3 string `gorm:"unique"`
	}

	DB.Migrator().DropTable(&ColumnStruct{})

## 弃用参数

现在假设你不再喜欢此参数。

你不得不将其保留一段时间，因为有些客户端正在使用它，但你希望文档清楚地将其展示为<abbr title ="已过时，建议不要使用它">已弃用</abbr>。

那么将参数 `deprecated=True` 传入 `Query`：

{* ../../docs_src/query_params_str_validations/tutorial010.py hl[18] *}

文档将会像下面这样展示它：

<img src="https://fastapi.tiangolo.com/img/tutorial/query-params-str-validations/image01.png">

## 总结

你可以为查询参数声明额外的校验和元数据。

通用的校验和元数据：

* `alias`
* `title`

  public void testToString_delayedTimeout() throws Exception {
    Integer javaVersion = Ints.tryParse(JAVA_SPECIFICATION_VERSION.value());
    // Parsing to an integer might fail because Java 8 returns "1.8" instead of "8."
    // We can continue if it's 1.8, and we can continue if it's an integer in [9, 20).
    if (javaVersion != null && javaVersion >= 20) {
      // TODO(b/261217224, b/361604053): Make this test work under newer JDKs.
      return;

	return
}

// Msgsize returns an upper bound estimate of the number of bytes occupied by the serialized message
func (z ReplicationMRFStats) Msgsize() (s int) {
	s = 1 + 16 + msgp.Uint64Size + 18 + msgp.Uint64Size + 18 + msgp.Uint64Size
	return
}

// DecodeMsg implements msgp.Decodable
func (z *SMA) DecodeMsg(dc *msgp.Reader) (err error) {
	var field []byte
	_ = field
	var zb0001 uint32

				r := snapshot
				return io.NopCloser(&r), nil
			}
		default:
			// This is where we'd set it to -1 (at least
			// if body != NoBody) to mean unknown, but
			// that broke people during the Go 1.8 testing
			// period. People depend on it being 0 I
			// guess. Maybe retry later. See Issue 18117.
		}
		// For client requests, Request.ContentLength of 0
		// means either actually 0, or unknown. The only way

pkg debug/elf, const R_ARM_TLS_DESCSEQ = 92
pkg debug/elf, const R_ARM_TLS_DESCSEQ R_ARM
pkg debug/elf, const R_ARM_TLS_DTPMOD32 = 17
pkg debug/elf, const R_ARM_TLS_DTPMOD32 R_ARM
pkg debug/elf, const R_ARM_TLS_DTPOFF32 = 18
pkg debug/elf, const R_ARM_TLS_DTPOFF32 R_ARM
pkg debug/elf, const R_ARM_TLS_GD32 = 104
pkg debug/elf, const R_ARM_TLS_GD32 R_ARM
pkg debug/elf, const R_ARM_TLS_GOTDESC = 90
pkg debug/elf, const R_ARM_TLS_GOTDESC R_ARM

			h[i] = int(c - '0')
		case c >= 'A' && c <= 'F':
			h[i] = int(c - 'A' + 10)
		case c >= 'a' && c <= 'f':
			h[i] = int(c - 'a' + 10)
		default:
			return -1
		}
	}
	return rune(h[0]<<12 + h[1]<<8 + h[2]<<4 + h[3])
}

// number called by `any` after reading number between 0 to 9
func (d *Decoder) number() (float64, error) {
	d.scratch.reset()

	var (
		c       = d.cur()
		n       float64

   * single "stop" control is required to interrupt or turn off ancillary devices, DC4 is the
   * preferred assignment.)
   *
   * @since 8.0
   */
  public static final byte DC2 = 18;

  /**
   * Device Control 3. Characters for the control of ancillary devices associated with data
   * processing or telecommunication systems, more especially switching devices "on" or "off." (If a

			}
		}
	}
	o = bts
	return
}

// Msgsize returns an upper bound estimate of the number of bytes occupied by the serialized message
func (z *BatchJobSnowball) Msgsize() (s int) {
	s = 1 + 8
	if z.Disable == nil {
		s += msgp.NilSize
	} else {
		s += msgp.BoolSize
	}
	s += 6
	if z.Batch == nil {
		s += msgp.NilSize
	} else {
		s += msgp.IntSize
	}
	s += 9