MysqL> SELECT LOCATE("n","München") COLLATE utf8_general_ci;
ERROR 1253 (42000): COLLATION 'utf8_general_ci' is not valid for CHARACTER SET 'binary'
我该如何摆脱这个错误？
我已经尝试过的(复制和粘贴)：
$MysqL -u admin -p $DATABASE
Enter password:
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Welcome to the MysqL monitor. Commands end with ; or \g.
Your MysqL connection id is 2
Server version: 5.1.69 Source distribution
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owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MysqL> SELECT LOCATE("n","München") COLLATE utf8_general_ci;
ERROR 1253 (42000): COLLATION 'utf8_general_ci' is not valid for CHARACTER SET 'binary'
MysqL> SET NAMES utf8;
Query OK,0 rows affected (0.00 sec)
MysqL> SELECT LOCATE("n","München") COLLATE utf8_general_ci;
ERROR 1253 (42000): COLLATION 'utf8_general_ci' is not valid for CHARACTER SET 'binary'
MysqL> SELECT LOCATE(_utf8"n",_utf8"München") COLLATE utf8_general_ci;
ERROR 1253 (42000): COLLATION 'utf8_general_ci' is not valid for CHARACTER SET 'binary'
MysqL> SHOW VARIABLES LIKE "character_set_database";
+------------------------+-------+
| Variable_name | Value |
+------------------------+-------+
| character_set_database | utf8 |
+------------------------+-------+
1 row in set (0.00 sec)
最佳答案
可能服务器已使用二进制的默认字符集进行编译,因此字符串文字正在被解释为,或者客户端设置为在与服务器通信时使用二进制模式.您可以通过调用SET NAMES utf8来更改客户端和连接字符集(但如果您的sql语句是从PHP发出的,则不建议这样做,因为PHP将有自己的命令来设置连接字符集).请参阅MysqL参考手册中的Connection Character Sets and Collations.
或者,您可以使用“introductionrs”明确指定LOCATE函数中用于字符串文字的字符集,例如：
LOCATE(_utf8"n",_utf8"München")
有关详细信息,请参见参考手册第Character String Literal Character Set and Collation页.