MySql的md5加密
MySql的md5加密
一、任务：
写一个crc的function，
写三个触发器，当users表的email字段有变更(insert, delete, update)时，将connect_email_hash 中的email_hash同步更新
CREATE TABLE `connect_user` (
`user_id` int(11) NOT NULL,
`app_id` int(11) NOT NULL,
`state` TINYINT(1) UNSIGNED NOT NULL DEFAULT 0,
PRIMARY KEY (`user_id`, `app_id`)
)ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin
CREATE TABLE `connect_email_hash` (
`user_id` int(11) NOT NULL,
`email_hash` VARCHAR(255) NOT NULL,
PRIMARY KEY (`user_id`)
)ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin
二、实现：
################## CRC ######################
create function getEmailHash(email varchar(255))
returns varchar(255)
begin
declare emailHash varchar(255);
declare emailCRC varchar(255);
declare emailMD5 varchar(255);
select crc32(email) into emailCRC;
select md5(email) into emailMD5;
set emailHash=concat(emailCRC,'_',emailMD5);
return emailHash;
end; //
Query OK, 0 rows affected (0.02 sec)
#### ############ 触发器 ######################
create trigger users_test_email_insert
AFTER insert on users_test for EACH ROW
BEGIN
declare email_hash VARCHAR(255);
set email_hash=getEmailHash(new.email);
insert into connect_email_hash(user_id,email_hash) values (new.id,email_hash);
END
create trigger user_test_email_update
AFTER update on users_test For EACH ROW
BEGIN
declare email_hash VARCHAR(255);
UPDATE connect_email_hash
SET email_hash=getEmailHash(new.email)
WHERE user_id=new.id;
END
create trigger users_test_email_delete
AFTER delete on users_test For EACH ROW
BEGIN
delete from connect_email_hash
WHERE user_id=old.id;
END
三、测试：
################## sql #################
set global log_bin_trust_routine_creators=1;
help 'show' ;
show create function getEmailHash ;//
create table users_test like users;
mysql> insert into users_test select * from users limit 10;
mysql> insert into connect_email_hash(user_id) select id from users limit 10;
insert into connect_user(user_id,app_id) values(10000,00001);
update users_test set email='[email protected]' where id=277406 ;
mysql> select * from connect_user;//
mysql> select * from connect_email_hash;//
select id,name,email from users_test;//
mysql> desc users_test;
mysql> delete from users_test where id=27740660 ;
insert into users_test(id,password,email,name) values(100000,'taohx','[email protected]','taohuixiang');
mysql> update users_test set email='[email protected]' where id=27740660 ;