无法在mysql中插入一些特殊字符

Question

该字符后的值被截断

为什么会发生这种情况？

create table tmp2(t1 varchar(100)); 

insert into tmp2 values('beforeafter'); 

mysql> select * from tmp2; 
+--------+ 
| t1 | 
+--------+ 
| before | 
+--------+ 
1 row in set (0.01 sec)

我运行了以下命令并返回了一些有用的信息

mysql> SHOW FULL COLUMNS FROM tmp2;
+-------+--------------+-----------------+------+-----+---------+-------+---------------------------------+---------+
| Field | Type         | Collation       | Null | Key | Default | Extra | Privileges                      | Comment |
+-------+--------------+-----------------+------+-----+---------+-------+---------------------------------+---------+
| t1    | varchar(100) | utf8_general_ci | YES  |     | NULL    |       | select,insert,update,references |         |
+-------+--------------+-----------------+------+-----+---------+-------+---------------------------------+---------+
1 row in set (0.00 sec)

和这个，

mysql> SELECT character_set_name FROM information_schema.`COLUMNS` WHERE table_schema = "test" AND table_name = "tmp2" AND column_name = "t1";
+--------------------+
| character_set_name |
+--------------------+
| utf8               |
+--------------------+
1 row in set (0.00 sec)

我在 ubuntu/mysql 命令行上测试这个。

Answer 1

我在这里找到了解决方案

我了解到有些字符不包含在 utf8 中

这里有一篇好文章

我需要将列 utf8 更改为 utf8mb4 并且它有效

alter table tmp2 modify t1 varchar(100) character set utf8mb4;

SET NAMES utf8mb4;

insert tmp2 values('beforeafter');