储存过程
DELIMITER //
CREATE PROCEDURE pro1()
BEGIN
SELECT book_id,book_name,category FROM bookinfo t1
JOIN bookcategory t2
ON t1.book_category_id = t2.category_id;
END//
DELIMITER ;DELIMITER //
CREATE PROCEDURE pro2(IN cid CHAR(18),OUT num INT)
BEGIN
DELETE FROM reader_info WHERE card_id = cid;
SELECT COUNT(card_id) INTO num FROM readerinfo;
END//
DELIMITER ;CALL pro2('21513333333',@num);
SELECT @num;储存过程交换两个数
DELIMITER //
CREATE PROCEDURE pro3(INOUT num1 INT INOUT num2 INT)
BEGIN
DECLARE t INT DEFAULT 0;
SET t=num1;
SET num1=num2;
SET num2=t;
END//
DELIMITER ;SET @n1=3,@n2=4;
CALL proc3(@n1,@n2);
SELECT @n1,@n2;
DROP PROCEDURE IF EXISTS proc1;SELECT FLOOR(RAND()*5); 随机数事务
ROLLBACK 事务回滚 就是不上面写的都不算
COMMIT  事务提交，就是确认
SET autocommit=0  禁止自动提交  =1为开启自动提交BEGIN
INSERT INTO mytest VALUES(4,'test01');
SAVEPOINT s1;   保存点
INSERT INTO mytest VALUES(4,'test02');
SAVEPOINT s2;
INSERT INTO mytest VALUES(4,'test03');
ROLLBACK TO s2;
COMMIT;
01 02  会保存  03不会DELIMITER //
CREATE PROCEDURE borrowproc(cid CHAR(18),bid INT)
BEGIN
DECLARE store_num INT;
DECLARE money FLOAT(7,3);
SELECT store INTO store_num FROM bookinfo WHERE book_id=bid;
SELECT balance INTO money FROM readerinfo WHERE card_id=cid;
SET autocommit=0;  禁止自动提交  同时也是事务的开始
INSERT INTO borrowinfo VALUES(bid,cid,CURDATE()),DATE_ADD(CURDATE(),INTERVAL 1 MONTH),'否');
UPDATE bookinfo SET store=store-1 WHERE book_id=bid;
UPDATE readerinfo SET balance=balance-(SELECT price FROM bookinfo WHERE  book_id=bid)*0.5 WHERE card_id =cid;
IF store_num=0 OR money<=200 THENROLLBACK;
ELSE COMMIT;
END IF;
END//
DELIMITER ;存储引擎
SHOW ENGINES;查看支持的引擎
INNODB 安全性能较强
MYISAM 不提供事务 有较高的处理效率
MEMORY 存放临时数据
设置存储引擎
1.my.ini 中 找到default-STORAGE-ENGINE=INNODB  重启mysql
2.set default_storage_engine=INNODB
3.创建表时设置
CREATE TABLE mytest(id INT PRIMARY INT,NAME VARCHAR(20))ENGINE =INNODB DEFAULT CHARSET=utf-8;4.alter TABLE test ENGINE=xxx;创建用户CREATE USER 'rose'@'localhost' IDENTIFIED BY 'rosepwd'  创建了用户名是rose 主机名是localhost，密码是rosepwd//用password的哈希值来创建SELECT PASSWORD('roswpwd');xxxxxxxxxxxxxxxxxxxxxxxCREATE USER 'rose'@'localhost' IDENTIFIED BY PASSWORD ' xxxxxxxxxxxxxxxxxxxxxxx' ;用grant创建  可以带有权限GRANT SELECT,UPDATE ON *.* TO 'testuser'@'localhost' IDENTIFIED BY 'testpwd'; select和update为允许的权限删除用户DROP USER 'testuser'@'localhost';DELETE FROM mysql.user WHERE HOST='hostname'AND USER='username';比如GRANT INSERT ,SELECT ON book.* TO 'rose'@'localhost';  为book数据库下所有的表设置查找和插入权限FLUSH privileges；  刷新权限表GRANT ALL PRIVILEGES ON *.* TO 'rose'@'localhost';为所有东西设置所有权限错误日志SHOW VARIABLES ;数据库的备份mysqldump -uroot -pmy123 book readerinfo >c:\mysqlbackup\tset1.sql;//备份book下的readerinfo表mysqldump -uroot -pmy123 --databases book mytese >c:\mysqlbackup\tset1.sql;//备份两个多个数据库mysqldump -uroot -pmy123 --all-DATABASES >c:\mysqlbackup\tset1.sql;//备份所有数据库
 恢复mysql -uroot -pmy123 book<c:\mysqlbackup\tset1.sql;恢复数据库下的tset表source c:\mysqlbackup\tset1.sql;  也可以导入导出位置不能随便my.ini下  找到secure-FILE-priv='xxxxxxxxxxxxx'看这个路径试什么你将它设置成null  这不允许导出设置成“”则为可以导出到任何位置SELECT * FROM book.readerinfo INTO OUTFILE 'xxxxxxxxxxxxxxxx/文件名。txt';这俩路径要一样SELECT * FROM book.readerinfo INTO OUTFILE 'xxxxxxxxxxxxxxxx/文件名。txt'FIELDS TERMINATED BY ','  设置列与列的分隔符LINES TERMINATED BY '\r\n'  设置行末尾换行符mysql导出文件mysql -uroot -pxxxx --execute='语句（执行并推出）' dbname>filename.txt;mysql -uroot -pmy123 --execute="select * from readerinfo;" book>"xxxxxxxxxxxx"
  将book数据库下的readerinfo表导出到xxxxxxxxx导入命令
LOAD DATA INFILE "xxxxxxxxxxxx" INTO TABLE book.readerinfo;将xxx导入到book下的readerinfo
mysqlimport -uroot -pmy123 book "xxxxxxxxxxxxxxx";