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 ; 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 如：ALTERTABLE 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 ; 如：ALTERTABLE 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 ; 如：ALTER TABLE logtest CHANGE title title VARCHAR(100) CHARACTER SET utf8 COLLATEutf8_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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