> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-parallel-read-in-order-multi-part.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> MsgPack 格式文档

# MsgPack

| 输入 | 输出 | 别名 |
| - | - | - |
| ✔ | ✔ | |

<div id="description">
  ## 说明
</div>

ClickHouse 支持读取和写入 [MessagePack](https://msgpack.org/) 格式的数据文件。

<div id="data-types-matching">
  ## 数据类型匹配
</div>

| MessagePack 数据类型 (`INSERT`) | ClickHouse 数据类型 | MessagePack 数据类型 (`SELECT`) |
| - | - | - |
| `uint N`, `positive fixint` | [`UIntN`](/zh/reference/data-types/int-uint) | `uint N` |
| `int N`, `negative fixint` | [`IntN`](/zh/reference/data-types/int-uint) | `int N` |
| `bool` | [`UInt8`](/zh/reference/data-types/int-uint) | `uint 8` |
| `fixstr`, `str 8`, `str 16`, `str 32`, `bin 8`, `bin 16`, `bin 32` | [`String`](/zh/reference/data-types/string) | `bin 8`, `bin 16`, `bin 32` |
| `fixstr`, `str 8`, `str 16`, `str 32`, `bin 8`, `bin 16`, `bin 32` | [`FixedString`](/zh/reference/data-types/fixedstring) | `bin 8`, `bin 16`, `bin 32` |
| `float 32` | [`Float32`](/zh/reference/data-types/float) | `float 32` |
| `float 64` | [`Float64`](/zh/reference/data-types/float) | `float 64` |
| `uint 16` | [`Date`](/zh/reference/data-types/date) | `uint 16` |
| `int 32` | [`Date32`](/zh/reference/data-types/date32) | `int 32` |
| `uint 32` | [`DateTime`](/zh/reference/data-types/datetime) | `uint 32` |
| `uint 64` | [`DateTime64`](/zh/reference/data-types/datetime) | `uint 64` |
| `fixarray`, `array 16`, `array 32` | [`Array`](/zh/reference/data-types/array)/[`Tuple`](/zh/reference/data-types/tuple) | `fixarray`, `array 16`, `array 32` |
| `fixmap`, `map 16`, `map 32` | [`Map`](/zh/reference/data-types/map) | `fixmap`, `map 16`, `map 32` |
| `uint 32` | [`IPv4`](/zh/reference/data-types/ipv4) | `uint 32` |
| `bin 8` | [`String`](/zh/reference/data-types/string) | `bin 8` |
| `int 8` | [`Enum8`](/zh/reference/data-types/enum) | `int 8` |
| `bin 8` | [`(U)Int128`/`(U)Int256`](/zh/reference/data-types/int-uint) | `bin 8` |
| `int 32` | [`Decimal32`](/zh/reference/data-types/decimal) | `int 32` |
| `int 64` | [`Decimal64`](/zh/reference/data-types/decimal) | `int 64` |
| `bin 8` | [`Decimal128`/`Decimal256`](/zh/reference/data-types/decimal) | `bin 8 ` |

<div id="example-usage">
  ## 示例用法
</div>

写入文件 ".msgpk"：

```sql theme={null}
$ clickhouse-client --query="CREATE TABLE msgpack (array Array(UInt8)) ENGINE = Memory;"
$ clickhouse-client --query="INSERT INTO msgpack VALUES ([0, 1, 2, 3, 42, 253, 254, 255]), ([255, 254, 253, 42, 3, 2, 1, 0])";
$ clickhouse-client --query="SELECT * FROM msgpack FORMAT MsgPack" > tmp_msgpack.msgpk;
```

<div id="format-settings">
  ## 格式设置
</div>

| 设置 | 描述 | 默认值 |
| - | - | - |
| [`input_format_msgpack_number_of_columns`](/zh/reference/settings/formats/input-format#input_format_msgpack_number_of_columns) | 插入的 MsgPack 数据中的列数。用于根据数据自动推断 schema。 | `0` |
| [`output_format_msgpack_uuid_representation`](/zh/reference/settings/formats/output-format#output_format_msgpack_uuid_representation) | 以 MsgPack 格式输出 UUID 的方式。 | `EXT` |