//修改表的引擎alter table a engine=myisam;//開啟事務begin;//關閉自動提交set autocommit=0;//扣100update bank set money=money-100 where bid=1;//回滾，begin開始的所有sql語句操作rollback;//開啟事務begin;//關閉自動提交set autocommit=0;//扣100update bank set money=money-100 where bid=1;//加100update bank set money=money+100 where bid=2;//提交commit;

$dsn = "mysql:host=127.0.0.1;dbname=c58";try {  //通過pdo連接數據庫  $pdo = new Pdo($dsn,'root','');  //把錯誤設置成異常模式，才能try catch接收  $pdo->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);  //設置字符集  $pdo->query("SET NAMES utf8");  //開啟事務  $pdo->query("BEGIN");  //關閉自動提交  $pdo->query("SET AUTOCOMMIT=0");  //轉賬  //扣掉100  $pdo->exec('UPDATE bank SET money=money-100 WHERE bid=1');  //加上100  $pdo->exec('UPDATE bank SET money=money+100 WHERE bid=2');  //提交  $pdo->query('COMMIT');} catch (PDOException $e) {  $pdo->query('ROLLBACK');  echo $e->getMessage();}

//1.創建視圖create view bankview as select bid,bname from bank;//2.查看視圖show table status where comment='VIEW';//3.修改視圖alter view bankview as select bid from bank;//4.刪除視圖drop view bankview;

//更變邊界符/d $//創建存儲過程create procedure get_bid(inout n char(20) charset utf8)begin  select bid from bank where name=n;end$//調用set @name='震'$call get_bid(@name)$//存儲過程作業//1. 創建刪除班級的存儲過程//2. 實現刪除班級時一并刪除此班級中的學生//3. 調用方式call del_class(1);//創建表create table class(  cid int unsigned primary key auto_increment,  cname char(20) not null default '');create table stu(  sid int unsigned primary key auto_increment,  sname char(20) not null default '',  cid int unsigned not null default 0);/d $create procedure del_class(inout id smallint)begin  delete from class where cid=id;  delete from stu where cid=id;end$set @id=1$call del_class(@id)$//1.in(輸出外面傳入的值，不能改變外面傳入的值)create procedure a(in id int)begin  select id;  set id=100;end$//2.out(不可以輸出外面傳入的值，能改變外面傳入的值)create procedure b(out id int)begin  select id;  set id=100;end$//3.inout（綜合上述兩種情況）create procedure insert_data(in num int)begin  while num > 0 do  insert into class set cname=num;  set num = num - 1;  end while;end$//查看狀態show procedure status;//刪除get_bid這個存儲過程drop procedure get_bid;

//創建create function hello(s char(20) charset utf8)returns char(50)reads sql databegin  return concat('hello ',s,' !');end$//調用select hello('hdw')$+--------------+| hello('hdw') |+--------------+| hello hdw ! |+--------------+//刪除drop function hello$//創建存儲函數create function getcid(n char(20) charset utf8)returns intreads sql databegin  return (select cid from stu where sname=n);end$//存儲函數可以用在sql語句中select cname from class where cid=getcid('小貓')$

//刪除班級自動觸發刪除學生create trigger del_class_stu after delete on classfor each rowbegin  delete from stu where cid=old.cid;end$//觸發器作業創建文章表含標題、作者、發布時間字段如果只添加了標題,發布時間字段自動設置為當前時間,作者字段設置為123網/d $create trigger this_name before insert on this_table for each rowbeginif new.uname is null thenset new.uname='123';end if;if new.timer is null thenset new.timer=unix_timestamp(now());end if;end$//查詢已有觸發器show triggers;