Question

这可能是与unicode相关的问题。

我有一个mysql源文件：

set names utf8;
STATUS;
drop table tianya;
create table tianya ( name char(50) not null primary key, passwd char (50) not null, email char(50));
insert into tianya values ("■■■■■■■■","68221",""),("12345678","098",""),("〡〢〣〤〥〦〧〨","1","");

当我运行这个sql文件时，mysql报告：第5行的错误1062（23000）：关键'PRIMARY'重复输入'〡〢〣〤〥〦〧〨'

这个图像：

但是，正如我们所看到的，该表是全新的，并且3个主键彼此不同。

那么，是什么导致了这个错误？

=======在2015年8月28日添加一些额外信息

mysql> create table tianya ( name char(50) not null primary key, passwd char (50) not null, email char(50));
Query OK, 0 rows affected (0.16 sec)

mysql> 
mysql> 
mysql> insert into tianya values ("■■■■■■■■","68221",""),("12345678","098","");
Query OK, 2 rows affected (0.19 sec)
Records: 2  Duplicates: 0  Warnings: 0

mysql> select name,hex(name) from tianya; 
+--------------------------+--------------------------------------------------+
| name                     | hex(name)                                        |
+--------------------------+--------------------------------------------------+
| ■■■■■■■■                 | E296A0E296A0E296A0E296A0E296A0E296A0E296A0E296A0 |
| 12345678                 | 3132333435363738                                 |
+--------------------------+--------------------------------------------------+
2 rows in set (0.03 sec)

mysql> insert into tianya values ("1234567","098",""),("〡〢〣〤〥〦〧〨","1","");                         
ERROR 1062 (23000): Duplicate entry '〡〢〣〤〥〦〧〨' for key 'PRIMARY'
mysql> delete from tianya;
Query OK, 2 rows affected (0.02 sec)

mysql> insert into tianya values ("1234567","098",""),("〡〢〣〤〥〦〧〨","1","");
Query OK, 2 rows affected (0.00 sec)
Records: 2  Duplicates: 0  Warnings: 0

mysql> select name,hex(name) from tianya;
+--------------------------+--------------------------------------------------+
| name                     | hex(name)                                        |
+--------------------------+--------------------------------------------------+
| 1234567                  | 31323334353637                                   |
| 〡〢〣〤〥〦〧〨         | E380A1E380A2E380A3E380A4E380A5E380A6E380A7E380A8 |
+--------------------------+--------------------------------------------------+
2 rows in set (0.00 sec)

mysql> describe tianya;
+--------+----------+------+-----+---------+-------+
| Field  | Type     | Null | Key | Default | Extra |
+--------+----------+------+-----+---------+-------+
| name   | char(50) | NO   | PRI | NULL    |       |
| passwd | char(50) | NO   |     | NULL    |       |
| email  | char(50) | YES  |     | NULL    |       |
+--------+----------+------+-----+---------+-------+
3 rows in set (0.05 sec)

mysql> show create table tianya ( name char(50) not null primary key, passwd char (50) not null, email char(50));
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '( name char(50) not null primary key, passwd char (50) not null, email char(50))' at line 1
mysql> show create table tianya;
+--------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table  | Create Table                                                                                                                                                                                                                                                                   |
+--------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| tianya | CREATE TABLE `tianya` (
  `name` char(50) COLLATE utf8_unicode_ci NOT NULL,
  `passwd` char(50) COLLATE utf8_unicode_ci NOT NULL,
  `email` char(50) COLLATE utf8_unicode_ci DEFAULT NULL,
  PRIMARY KEY (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci |
+--------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

====和另一个测试：

xungeng@fl-ubuntu:~/tmp/a$ mysql -u root test < a.sql 
Table   Create Table
t2      CREATE TABLE `t2` (\n  `name` varchar(10) COLLATE utf8_unicode_ci NOT NULL,\n  UNIQUE KEY `name` (`name`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci
ERROR 1062 (23000) at line 5: Duplicate entry 'hì' for key 'name'
xungeng@fl-ubuntu:~/tmp/a$ cat a.sql 
set names utf8;
drop table if exists t2;
create table t2 (name varchar(10) not null unique key);
show create table t2;
insert into t2 values ("hí"),("hì");

Answer 1

最后我知道发生了什么。

collate utf_unicode_ci不区分大小写。如果存在密钥“test”或“Test”，则会导致'TEST'的主键或唯一键的插入失败。我认为碰撞是由'■■■■■■■■'和'〡〢〣〤〥〦〧〨'引起的，这误导了你和我。事实上，碰撞是由'12345678'和'〡〢〣〤〥〦〧〨'引起的。

符号'〡〢〣〤〥〦〧〨'看起来很好奇。它们分别是编号为12345678的古代中文符号。 [参考：https://zh.wikipedia.org/wiki/%E7%AD%B9%E7%AE%97（仅限中文版）]

要解决此问题，我将utf8_unicode_ci更改为utf8_bin。

Answer 2

您可以在create语句中添加到表的charset中。追加＆＃39;设置charset = utf8＆＃39;。也许这有帮助。见http://dev.mysql.com/doc/refman/5.1/en/create-table.html 部分表 - 选项

mysql

2 个答案: