修改數據庫字符集：
復制代碼代碼如下:
ALTER DATABASE db_name DEFAULT CHARACTER SET character_name [COLLATE ...];
把表默認的字符集和所有字符列（CHAR,VARCHAR,TEXT）改為新的字符集：
復制代碼代碼如下:
ALTER TABLE tbl_name CONVERT TO CHARACTER SET character_name [COLLATE ...]
如：ALTER TABLE logtest CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;
只是修改表的默認字符集：
復制代碼代碼如下:
ALTER TABLE tbl_name DEFAULT CHARACTER SET character_name [COLLATE...];
如：ALTER TABLE logtest DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
修改字段的字符集：
復制代碼代碼如下:
ALTER TABLE tbl_name CHANGE c_name c_name CHARACTER SET character_name [COLLATE ...];
如：ALTER TABLE logtest CHANGE title title VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_general_ci;
查看數據庫編碼：
復制代碼代碼如下:
SHOW CREATE DATABASE db_name;
查看表編碼：
復制代碼代碼如下:
SHOW CREATE TABLE tbl_name;
查看字段編碼：
復制代碼代碼如下:
SHOW FULL COLUMNS FROM tbl_name;
