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mysql提示:Illegal mix of collations for operation ‘UNION’
来源:互联网   发布日期:2016-01-28 13:01:15   浏览:2310次  

导读:语句很简单代码如下?php$connection=mysql_connect(localhost,root,password); 连接并选择数据库服务器mysql_select_db(test,$connection);$query=select * from users where name= 39;你好 ...

语句很简单

代码如下

<?php

$connection=mysql_connect("localhost","root","password"); //连接并选择数据库服务器

mysql_select_db("test",$connection);

$query="select * from users where name='你好'";

$result=mysql_query($query,$connection);

while($row=mysql_fetch_array($result))

{

echo "用户ID:".$row[0]."<br>"; //也可以写做$row["user_id"]

echo "用户名:".$row[1]."<br>"; //也可以写做$row["user_name"]

}

?>

运行结果提示

Error: Illegal mix of collations (gbk_chinese_ci,IMPLICIT) and (latin1_swedish_ci,COERCIBLE) for operation '='

意思是说:操作符 = 比较的字符集不一致,一个是gbk_chinese_ci,一个是latin1_swedish_ci。

首先、查看mysql的my.cnf,确认为utf8

代码如下

mysql> show variables like "%char%";

+--------------------------+-------------------------------------+

| Variable_name| Value|

+--------------------------+-------------------------------------+

| character_set_client| utf8|

| character_set_connection | utf8|

| character_set_database| latin1|

| character_set_filesystem | binary|

| character_set_results| utf8|

| character_set_server| utf8|

| character_set_system| utf8|

| character_sets_dir| D:/MySQL Server 5.0/share/charsets/ |

+--------------------------+-------------------------------------+

8 rows in set (0.00 sec)

mysql> show variables like "%coll%";

+----------------------+-------------------+

| Variable_name| Value|

+----------------------+-------------------+

| collation_connection | utf8_general_ci|

| collation_database| latin1_swedish_ci |

| collation_server| utf8_general_ci|

+----------------------+-------------------+

3 rows in set (0.00 sec)

然后将数据库中所有编码方式改为统一:

代码如下

mysql> set character_set_database=utf8;

Query OK, 0 rows affected (0.00 sec)

mysql> set collation_database= utf8_general_ci

重新查看字符集及数据表字段编码字符是否一致:

总结

utf8_bin

utf8_general_ci

utf8_unicode_ci

utf8_bin 与 utf8_general_ci 可以

utf8_bin 与 utf8_unicode_ci 可以

utf8_general_ci 与 utf8_unicode_ci 不可以

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