mysql修改表、字段、库的字符集

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修改数据库字符集：
ALTER DATABASE db_name DEFAULT CHARACTER SET character_name [COLLATE …];
如：ALTER DATABASE login DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
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 logintable 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 logintable 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 logintable CHANGE name name VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_general_ci;
查看数据库编码：
SHOW CREATE DATABASE db_name;
查看表编码：
SHOW CREATE TABLE tbl_name;
查看字段编码：
SHOW FULL COLUMNS FROM tbl_name;

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