Mysql insert Chinese into full question mark？？ The solution to the problem

1. Check and modify the my.ini configuration file of mysql

default-character-set=utf8

2, the establishment of a database is to specify a character set

create database mydb default character set utf8 collate utf8_general_ci;

3. Set up data representation to specify character set:
Command in question:

CREATE TABLE IF NOT EXISTS `mydb` ( 
  `username` varchar(64) NOT NULL, 
  `userid` int(11) NOT NULL, 
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1; 

 
CREATE TABLE IF NOT EXISTS `mydb` ( 
  `username` varchar(64) NOT NULL, 
  `userid` int(11) NOT NULL, 
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;

Note: mysql version: 5.5.24