(Dies ist nicht wirklich eine Antwort, sondern ein Versuch zu isolieren, was das Problem verursacht und was es beheben könnte.)
Holen Sie sich in eine DATABASE mit einem völlig irrelevanten CHARACTER SET und COLLATION .
mysql> CREATE DATABASE `so40064402` /*!40100 DEFAULT CHARACTER SET ucs2 COLLATE ucs2_bin */
mysql> USE so40064402;
Database changed
Richten Sie utf8_polish für den Client ein:
mysql> SET NAMES utf8 COLLATE utf8_polish_ci;
Query OK, 0 rows affected (0.00 sec)
mysql> SHOW VARIABLES LIKE 'c%a%t%';
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8 | -- from SET NAMES
| character_set_connection | utf8 | -- from SET NAMES
| character_set_database | ucs2 | -- from DATABASE
| character_set_filesystem | binary | -- (constant)
| character_set_results | utf8 | -- from SET NAMES
| character_set_server | utf8mb4 |
| character_set_system | utf8 | -- (constant)
| character_sets_dir | /usr/share/mysql/charsets/ |
| collation_connection | utf8_polish_ci | -- from SET NAMES
| collation_database | ucs2_bin | -- from DATABASE
| collation_server | utf8mb4_unicode_520_ci |
+--------------------------+----------------------------+
11 rows in set (0.00 sec)
mysql> select charset(uuid()), collation(uuid());
+-----------------+-------------------+
| charset(uuid()) | collation(uuid()) |
+-----------------+-------------------+
| utf8 | utf8_general_ci | -- part of the problem, but can't fix this
+-----------------+-------------------+
1 row in set (0.00 sec)
mysql> select replace(uuid(),'-','');
ERROR 1270 (HY000): Illegal mix of collations
(utf8_general_ci,COERCIBLE),
(utf8_polish_ci,COERCIBLE),
(utf8_polish_ci,COERCIBLE) for operation 'replace'
mysql>
mysql>
mysql>
mysql> SET NAMES utf8mb4 COLLATE utf8mb4_polish_ci;
Query OK, 0 rows affected (0.00 sec)
Jetzt ändern wir SET NAMES nur. Jetzt gehts!?? Trotz UUID() B. utf8 sein !?
mysql> SHOW VARIABLES LIKE 'c%a%t%';
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8mb4 | -- from SET NAMES
| character_set_connection | utf8mb4 | -- from SET NAMES
| character_set_database | ucs2 |
| character_set_filesystem | binary |
| character_set_results | utf8mb4 | -- from SET NAMES
| character_set_server | utf8mb4 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
| collation_connection | utf8mb4_polish_ci | -- from SET NAMES
| collation_database | ucs2_bin |
| collation_server | utf8mb4_unicode_520_ci |
+--------------------------+----------------------------+
11 rows in set (0.00 sec)
mysql> select replace(uuid(),'-','');
+----------------------------------+
| replace(uuid(),'-','') |
+----------------------------------+
| ea841aacf83b11e8a66580fa5b3669ce |
+----------------------------------+
1 row in set (0.00 sec)
mysql>
