mysql emoji placement

Convert Mysql encoding from utf8 to utf8mb4.

Requires >= MySQL version 5.5.3, (checked 5.5.29 is also possible) lower version does not support this character set, copy error

Stop MySQL Server service

Modify my.cnf or mysql.ini

[client]
default-character-set = utf8mb4

[mysql]
default-character-set = utf8mb4

[mysqld]
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
init_connect='SET NAMES utf8mb4'

 

Restart MySQL Server: service mysql restart, check the character set

SHOW VARIABLES WHERE Variable_name LIKE 'character%' OR Variable_name LIKE 'collation%';

Modify the database character set:

ALTER DATABASE database_name CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;

 

Modify the character set of the table:

ALTER TABLE table_name CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

 

Modify the character set of the field:

ALTER TABLE table_name CHANGE column_name column_name VARCHAR(191) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

 

Use mysql-connector-java-5.1.18.jar or higher in the program

Database connection use ?useUnicode=true

jdbc:mysql://127.0.0.1:3306/o2o_user_suda?useUnicode=true

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ALTER DATABASE `o2o_user_onetime` CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;

 
ALTER TABLE order_info CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;




SHOW VARIABLES WHERE Variable_name LIKE 'character%' OR Variable_name LIKE 'collation%';

SET character_set_database = utf8mb4 ; 


SET character_set_client = utf8mb4 ;  
SET character_set_connection = utf8mb4 ;  
SET character_set_results = utf8mb4 ;  
SET character_set_server = utf8mb4 ;