Mysql 5.5.18 version saves Emoji expression abnormal solution

problem phenomenon

Insert data into Mysql database, an exception occurs

 

SQL state [HY000]; error code [1366]; Incorrect string value: '\xF0\x9F\x90\x94\xF0\x9F...' for column 'COLUMN_NAME' at row 1; 

nested exception is java.sql.SQLException: Incorrect string value: '\xF0\x9F\x90\x94\xF0\x9F...' for column 'COLUMN_NAME' at row 1

 

problem analysis

Check the data saved to Column and find that the saved data contains Emoji expressions

 

Emoji expression is 4 bytes, while MYSQL 5.5.18 version UTF8 is three bytes

 

Solution

Convert Mysql database character encoding from utf8 to utf8mb4

 

Specific operation steps

1. Modify MySQL character encoding

Modify my.cnf

[mysqld]

character-set-server=utf8mb4

[mysql]

default-character-set=utf8mb4

 

Restart Mysql after modification

 

2. Modify the character encoding of the database table

Command: alter table TABLE_NAME convert to character set utf8mb4 collate utf8mb4_bin; (replace TABLE_NAME with your table name)