mysql修改表、字段、库的字符集

修改数据库字符集：

ALTER DATABASE db_name DEFAULT CHARACTER SET character_name [COLLATE ...]; 
把表默认的字符集和所有字符列（CHAR,VARCHAR,TEXT）改为新的字符集：

ALTER TABLE tbl_name CONVERT TO CHARACTER SET character_name [COLLATE ...]
如：ALTER TABLE logtest CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci; 
只是修改表的默认字符集：

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：

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  

 

SHOW TABLE conf_summary FROM pc ;
SHOW TABLE STATUS FROM pc LIKE '%conf_summary%';
SHOW FULL COLUMNS FROM conf_summary;

SHOW VARIABLES LIKE 'collation_%';
ALTER DATABASE `pc` CHARACTER SET utf8 COLLATE utf8_general_ci;
ALTER TABLE `pc`.`conf_summary` COLLATE=utf8_general_ci;