MySQL inserts Chinese data and reports an error. Set the default collation

【 Issues an error 】
When inserting data into the database ,varchar An error occurs when inserting Chinese data into a field of type .
Original error report ：
ERROR 1366 (HY000): Incorrect string value: ‘\xE8\xA5\xBF\xE5\xAE\x89’ for column ‘address’

【 Cause analysis 】
adopt show full columns from user_bean; Statement to view the of the field collation attribute , Found field collation The property value is latin1_swedish_ci , The description field defaults to English . Chinese is not set , So when inputting Chinese ,mysql The error will be reported as “ The value of the string is incorrect ”.

【 resolvent 】

1. edit mysql Configuration file for /etc/my.cnf,vi /etc/my.cnf

2. stay [mysqld] Now add two lines to supplement
   character_set_server=utf8
collation_server=utf8_general_ci

3. restart Mysql service systemctl restart mysqld

4. Insert Chinese data into the database , success ！

Be careful ： The above steps can solve the problem of fields when creating tables in the future collation Attribute problem , But the table fields that have been created earlier collation The attribute value does not change .
If you want to change the previously created table , What do I do ？
Method 1： Modify the original table , You can use similar statements
alter table user_bean change address address varchar(255) character set utf8 collate utf8_general_ci not null;
Method 2： Delete the original table , Rebuild .

【 Command summary 】

show full columns from  Table name 

vi /etc/my.cnf
character_set_server=utf8
collation_server=utf8_general_ci

systemctl restart mysqld

alter table  Table name  change  Fields to modify   Field name   data type   character set utf8 collate utf8_general_ci  constraint condition ;