MySQL 檢視編碼格式

檢視資料庫的排序規則

mysql> show variables like 'collation%';
+----------------------+-------------------+
| Variable_name        | Value             |
+----------------------+-------------------+
| collation_connection | utf8_general_ci   |
| collation_database   | utf8_general_ci   |
| collation_server     | latin1_swedish_ci |
+----------------------+-------------------+
3
 
 rows in set (0.00 sec)

檢視資料庫的編碼格式

mysql> show variables like 'char%';
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | latin1                     |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share
 
/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)

檢視欄位的排序規則

mysql> show create table tablename;

查看錶欄位資訊

mysql> desc tablename;

檢視當前資料庫編碼

mysql> use databasename;
Database changed

mysql> show variables like 'character_set_database'
 
; 
+------------------------+-------+
| Variable_name          | Value |
+------------------------+-------+
| character_set_database | utf8  |
+------------------------+-------+
1 row in set (0.03 sec)

修改當前資料庫的編碼

mysql> use databasename;
Database changed

mysql> alter database databasename character set latin1;  #將之前的utf8編碼修改為latin1編碼
Query OK, 1 row affected (0.00 sec)
+------------------------+--------+
| Variable_name          | Value  |
+------------------------+--------+
| character_set_database | latin1 |
+------------------------+--------+
1 row in set (0.00 sec)

檢視欄位編碼

SHOW FULL COLUMNS FROM tablename;

修改欄位的字符集

ALTER TABLE tablename CHANGE c_name c_name CHARACTER SET character_name [COLLATE ...];
如：ALTER TABLE users CHANGE title title VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_general_ci;