(1) the simplest modification method is to modify the key values of the character set in the my.ini file of mysql. Such as default character - set = utf8 character_set_server = utf8

After the modification, restart the mysql service, service mysql restart Using mysql > SHOW VARIABLES LIKE ‘character %’; Check and find that the database code has been changed to utf8

+--------------------------+---------------------------------+ 
| Variable_name | Value | 
+--------------------------+---------------------------------+ 
| character_set_client | utf8 | 
| character_set_connection | utf8 | 
| character_set_database | utf8 |
| character_set_filesystem | binary | 
| character_set_results | utf8 | 
| character_set_server | utf8 | 
| character_set_system | utf8 | 
| character_sets_dir | D:"mysql-5.0.37"share"charsets" | 
+--------------------------+---------------------------------+ 

(2) another way to modify the mysql default character set is to use the mysql command

mysql> SET character_set_client = utf8 ;
mysql> SET character_set_connection = utf8 ; 
mysql> SET character_set_database = utf8 ; 
mysql> SET character_set_results = utf8 ; 
mysql> SET character_set_server = utf8 ; 
mysql> SET collation_connection = utf8 ;
mysql> SET collation_database = utf8 ; 
mysql> SET collation_server = utf8 ; 

1. Even if you set the mysql default character set of the table to utf8 and send the query through the UTF-8 encoding, you will find that the data stored in the database is still scrambled. The problem lies in this connection connection layer. The solution is to execute 1 below before sending the query:

SET NAMES 'utf8';

It is equivalent to the following three instructions:

SET character_set_client = utf8;
SET character_set_results = utf8; 
SET character_set_connection = utf8;