sql mysql utf8mb4设置

Posted 2021-05-13

# Python3 PyMySQL Raise Incorrect String Value When Inserting UTF-8 Data

## Description

Python3 + PyMySQL 的环境, 如果在数据库中写入中文, 会出现报错: 

``` bash
pymysql.err.InternalError: (1366, "Incorrect string value: '\\xE6\\xB5\\x8B\\xE8\\xAF\\x95' for column 'description' at row 1")
```

查询发现主要原因是 mysql 对 utf8 的支持是最大 3 个 bytes, 而写入是以 4 byptes 为准的.

所以需要在创建的时候指定 charset 为 `utf8mb4`, 创建方法[见 snippet](#file-command-sql)

## Reference:

- [Solution of Error in Insertion](https://stackoverflow.com/questions/47419943/pymysql-warning-1366-incorrect-string-value-xf0-x9f-x98-x8d-t)
- [Change Database with utf8mb4](https://gist.github.com/dschneider/dc914b37c66dbf76a16b)
- [修改MySQL的字符集为utf8mb4](https://docs.lvrui.io/2016/08/21/%E4%BF%AE%E6%94%B9MySQL%E7%9A%84%E5%AD%97%E7%AC%A6%E9%9B%86%E4%B8%BAutf8mb4/)
- [mysql:sql create database新建utf8mb4 数据库](https://blog.csdn.net/ShellDawn/article/details/71170543)

CREATE DATABASE utf_test
  CHARACTER SET utf8mb4
  COLLATE utf8mb4_unicode_ci;