使MySQL可以或許存儲emoji臉色字符的設置教程。本站提示廣大學習愛好者：（使MySQL可以或許存儲emoji臉色字符的設置教程）文章只能為提供參考，不一定能成為您想要的結果。以下是使MySQL可以或許存儲emoji臉色字符的設置教程正文
MySQL 須要支撐 emoji 臉色符號版本須要年夜於5.5.3，且字符集須要設置為utf8mb4 字符集。
utf8mb4和utf8究竟有甚麼差別呢？本來以往的mysql的utf8一個字符最多3字節，而utf8mb4則擴大到一個字符最多能有4字節，所以能支撐更多的字符集。
將Mysql的編碼從utf8轉換成utf8mb4。
須要 >= MySQL 5.5.3版本、從庫也必需是5.5的了、低版本不支撐這個字符集、復制報錯
停滯MySQL Server辦事
修正 my.cnf或許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'
重啟 MySQL Server、檢討字符集。
檢查辦事器字符集設置
mysql> SHOW VARIABLES WHERE Variable_name LIKE 'character%' OR Variable_name LIKE 'collation%';
+--------------------------+--------------------+ | Variable_name | Value | +--------------------------+--------------------+ | character_set_client | utf8mb4 | | character_set_connection | utf8mb4 | | character_set_database | utf8mb4 | | character_set_filesystem | binary | | character_set_results | utf8mb4 | | character_set_server | utf8mb4 | | character_set_system | utf8 | | collation_connection | utf8mb4_unicode_ci | | collation_database | utf8mb4_unicode_ci | | collation_server | utf8mb4_unicode_ci | +--------------------------+--------------------+
檢查數據庫字符集
mysql> select * from SCHEMATA where SCHEMA_NAME='ttlsa';
+--------------+-------------+----------------------------+------------------------+----------+ | CATALOG_NAME | SCHEMA_NAME | DEFAULT_CHARACTER_SET_NAME | DEFAULT_COLLATION_NAME | SQL_PATH | +--------------+-------------+----------------------------+------------------------+----------+ | def | ttlsa | utf8mb4 | utf8mb4_unicode_ci | NULL | +--------------+-------------+----------------------------+------------------------+----------+
檢查表字符集
mysql> select TABLE_SCHEMA,TABLE_NAME,TABLE_COLLATION from information_schema.TABLES;
+--------------------+----------------------------------------------------+--------------------+ | TABLE_SCHEMA | TABLE_NAME | TABLE_COLLATION | +--------------------+----------------------------------------------------+--------------------+
檢查列字符集
mysql> select TABLE_SCHEMA,TABLE_NAME,COLUMN_NAME,COLLATION_NAME from COLUMNS;
+--------------------+----------------------------------------------------+--------------------------------------------+--------------------+ | TABLE_SCHEMA | TABLE_NAME | COLUMN_NAME | COLLATION_NAME | +--------------------+----------------------------------------------------+--------------------------------------------+--------------------+
轉換字符集語句
use information_schema;
SELECT concat("ALTER DATABASE `",table_schema,"` CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;") as _sql
FROM `TABLES` where table_schema like "DB_NAME" group by table_schema;
SELECT concat("ALTER TABLE `",table_schema,"`.`",table_name,"` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;") as _sql
FROM `TABLES` where table_schema like "DB_NAME" group by table_schema, table_name;
SELECT concat("ALTER TABLE `",table_schema,"`.`",table_name, "` CHANGE `",column_name,"` `",column_name,"` ",data_type,"(",character_maximum_length,") CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;") as _sql
FROM `COLUMNS` where table_schema like "DB_NAME" and data_type in ('varchar');
SELECT concat("ALTER TABLE `",table_schema,"`.`",table_name, "` CHANGE `",column_name,"` `",column_name,"` ",data_type," CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;") as _sql
FROM `COLUMNS` where table_schema like "DB_NAME" and data_type in ('text','tinytext','mediumtext','long
