ALTER TABLE `table` DEFAULT CHARACTER SET utf8;
但是雖然修改了表的編碼格式，但是字段的編碼格式並沒有修改過來，沒有什么卵用
又發現一條語句，作用是修改字段的編碼格式
ALTER TABLE `tablename` CHANGE `字段名1` `字段名2` VARCHAR(36) CHARACTER SET utf8 NOT NULL;
最后找到這么一條語句
alter table `tablename` convert to character set utf8;
它可以修改一張表的所有字段的編碼格式，頓時方便多了
Ps ：延伸一下，修改mysql中所有表，所有字段編碼，需要用到存儲過程
轉換表字段編碼的sql語句為：alter table `tableName` convert to character set utf8'
CREATE PROCEDURE `pr_convert_dbtab_utf8`(IN dbName varchar(100))
BEGIN
declare stop int default 0;
declare tabCount int default 0;
declare strSql varchar(1000);
declare name varchar(100);
declare cur CURSOR FOR select table_name from information_schema.tables where table_schema=dbName;
declare CONTINUE HANDLER FOR SQLSTATE '02000' SET stop = null;
OPEN cur;
FETCH cur INTO name;
WHILE ( stop is not null) DO
set tabCount=tabCount+1;
set strSql = concat('alter table `',name,'` convert to character set utf8');
set @sql1 = strSql;
prepare stmt_p from @sql1;
execute stmt_p;
FETCH cur INTO name;
END WHILE;
CLOSE cur;
SELECT concat('table: ', tabCount);
END;
輸入調用存儲過程的命令，參數為需要轉換的數據庫名
mysql> call pr_convert_dbtab_utf8('jiradb');
+-----------------------------+
| concat('table: ', tabCount) |
+-----------------------------+
| table: 245 |
+-----------------------------+
1 row in set
Query OK, 0 rows affected
mysql>