mysql创库的时候设置编码 ``` create database testdb4 CHARACTER set utf8mb4 ``` 创表的时候设置编码 ``` create table test2 ( name varchar(64) CHARACTER SET utf8mb4 ) CHARACTER SET = utf8mb4 ``` 修改表的编码 ``` alter table test CHARACTER set utf8 ``` 修改数据库的编码 ``` alter database jbland CHARACTER set utf8mb4 ```