MySQL 需要支持 emoji 表情符号版本需要大于5.5.3，且字符集需要设置为utf8mb4 字符集。
查看服务器字符集设置
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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 |
+————————–+——————–+
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查看数据库字符集
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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 |
+———————+——————–+——————————————+————————————+—————+
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查看表字符集
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mysql> select TABLE_SCHEMA,TABLE_NAME,TABLE_COLLATION from information_schema.TABLES;
+——————–+—————————————————-+——————–+
| TABLE_SCHEMA | TABLE_NAME | TABLE_COLLATION |
+——————–+—————————————————-+——————–+
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查看列字符集
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mysql> select TABLE_SCHEMA,TABLE_NAME,COLUMN_NAME,COLLATION_NAME from COLUMNS;
+——————–+—————————————————-+——————————————–+——————–+
| TABLE_SCHEMA | TABLE_NAME | COLUMN_NAME | COLLATION_NAME |
+——————–+—————————————————-+——————————————–+——————–+
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转换字符集语句
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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’,‘longtext’);
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然后执行这些语句，将字符集转换为utf8mb4_unicode_ci。
文章转载来自：ttlsa.com
