觸發(fā)器的概念：它是由事件驅(qū)動(dòng)的，就像java中的監(jiān)聽，當(dāng)某個(gè)事件發(fā)生了，就會(huì)做一些工作。

下面直接上干貨，創(chuàng)建insert觸發(fā)器、delete觸發(fā)器、DDL觸發(fā)器和如何查看觸發(fā)器定義

1.創(chuàng)建三個(gè)表學(xué)生表、班級(jí)表、課程表

--在數(shù)據(jù)庫中創(chuàng)建三個(gè)表學(xué)生表、班級(jí)表、課程表的結(jié)構(gòu)create table student ( stu_id char(8) primary key,stu_name char(10),stu_sex char(2),stu_birthday smalldatetime,class_id char(6) ) go create table class ( class_id char(6) primary key,class_name varchar(30), class_num int, ) create table course ( course_id char(3) primary key,course_name varchar(30), ) go create table score ( stu_id char(8),course_id char(3),score int check(score>=0 and score<=100)primary key(stu_id,course_id) ) go View Code

2.插入數(shù)據(jù)

--往表中插入數(shù)據(jù)(student,course,score)insert into student values('0601001','李玉','女','1987-05-06', '0601')insert into student values('0601002','魯敏','女','1988-06-28', '0601')insert into student values('0601003','李小路','女','1987-01-08', '0601')insert into student values('0601004','魯斌','男','1988-04-21', '0601')insert into student values('0601005','王寧靜','女','1986-05-29', '0601')insert into student values('0601006','張明明','男','1987-02-24', '0601')insert into student values('0601007','劉曉玲','女','1988-12-21', '0601')insert into student values('0601008','周曉','男','1986-04-27', '0601')insert into student values('0601009','易國梁','男','1985-11-26', '0601')insert into student values('0601010','季風(fēng)','男','1986-09-21', '0601')insert into class values('0501','計(jì)算機(jī)辦公應(yīng)用', 40) insert into class values('0502','網(wǎng)絡(luò)構(gòu)建', 43) insert into class values('0503','圖形圖像', 48) insert into class values('0601','可視化', 41) insert into class values('0602','數(shù)據(jù)庫', 38) insert into class values('0603','網(wǎng)絡(luò)管理', 45) insert into class values('0604','多媒體', 40) insert into class values('0701','計(jì)算機(jī)辦公應(yīng)用', 39) insert into class values('0702','WEB應(yīng)用', 38) insert into class values('0703','網(wǎng)絡(luò)構(gòu)建', 40)insert into course values('001','計(jì)算機(jī)應(yīng)用基礎(chǔ)') insert into course values('002','關(guān)系數(shù)據(jù)基礎(chǔ)') insert into course values('003','程序設(shè)計(jì)基礎(chǔ)') insert into course values('004','數(shù)據(jù)結(jié)構(gòu)') insert into course values('005','網(wǎng)頁設(shè)計(jì)') insert into course values('006','網(wǎng)站設(shè)計(jì)') insert into course values('007','SQL Server 2000關(guān)系數(shù)據(jù)庫') insert into course values('008','SQL Server 2000程序設(shè)計(jì)') insert into course values('009','計(jì)算機(jī)網(wǎng)絡(luò)') insert into course values('010','Windows Server 配置')insert into score values('0601001','001',78) insert into score values('0601002','001',88) insert into score values('0601003','001',65) insert into score values('0601004','001',76) insert into score values('0601005','001',56) insert into score values('0601006','001',87) insert into score values('0601007','001',67) insert into score values('0601008','001',95) insert into score values('0601009','001',98) insert into score values('0601010','001',45)insert into score values('0601001','002',48) insert into score values('0601002','002',68) insert into score values('0601003','002',95) insert into score values('0601004','002',86) insert into score values('0601005','002',76) insert into score values('0601006','002',57) insert into score values('0601007','002',77) insert into score values('0601008','002',85) insert into score values('0601009','002',98) insert into score values('0601010','002',75)insert into score values('0601001','003',88) insert into score values('0601002','003',78) insert into score values('0601003','003',65) insert into score values('0601004','003',56) insert into score values('0601005','003',96) insert into score values('0601006','003',87) insert into score values('0601007','003',77) insert into score values('0601008','003',65) insert into score values('0601009','003',98) insert into score values('0601010','003',75)insert into score values('0601001','004',74) insert into score values('0601002','004',68) insert into score values('0601003','004',95) insert into score values('0601004','004',86) insert into score values('0601005','004',76) insert into score values('0601006','004',67) insert into score values('0601007','004',77) insert into score values('0601008','004',85) insert into score values('0601009','004',98) insert into score values('0601010','004',75)insert into score values('0601001','005',74) insert into score values('0601002','005',68) insert into score values('0601005','005',76) insert into score values('0601008','005',85) insert into score values('0601009','005',98) insert into score values('0601010','005',75)insert into score values('0601002','006',88) insert into score values('0601003','006',95) insert into score values('0601006','006',77) insert into score values('0601008','006',85) insert into score values('0601010','006',55)insert into score values('0601001','007',84) insert into score values('0601002','007',68) insert into score values('0601003','007',95)insert into score values('0601004','008',86) insert into score values('0601005','008',76) insert into score values('0601006','008',67)insert into score values('0601007','009',67) insert into score values('0601008','009',85)insert into score values('0601009','010',98) insert into score values('0601010','010',75) View Code

3.觸發(fā)器實(shí)例

--1）在student上創(chuàng)建<strong>INSERT觸發(fā)器</strong>stu_insert，要求在student表中插入記錄時(shí)(要求每次只能插入一條記錄)，這個(gè)觸發(fā)器都將更新class表中的class_nun列。并測試觸發(fā)器stu_insert。 create trigger stu_insert on student for insert as update class set class_num=class_num + 1 where class_id=(select class_id from inserted)select * from class --測試 insert into student values('0602011','文','女','1986-09-21', '0602')select * from class--2）在student上創(chuàng)建<strong>DELETE觸發(fā)器</strong>stu_delete，要求在student表中刪除記錄時(shí)，這個(gè)觸發(fā)器都將更新class表中的class_nun列。并測試觸發(fā)器stu_delete。 create trigger stu_delete on student for delete as update class set class_num=class_num - 1 where class_id = (select class_id from deleted)--測試 delete from student where stu_id='0601001'--3）查看觸發(fā)器相關(guān)信息:使用系統(tǒng)存儲(chǔ)過程<strong>sp_help，sp_helptext查看觸發(fā)器</strong>相關(guān)信息。 exec sp_help exec sp_help stu_insert exec sp_helptext stu_insert--4）對于下列觸發(fā)器： create trigger stu_update on student instead of update as print '修改學(xué)生表' drop trigger stu_update --執(zhí)行語句 update student set stu_id='0601003' where stu_name='魯斌' --會(huì)怎么樣？ --消息 2627，級(jí)別 14，狀態(tài) 1，第 1 行 --違反了 PRIMARY KEY 約束 'PK__student__E53CAB217F60ED59'。不能在對象 'dbo.student' 中插入重復(fù)鍵。 --語句已終止。--5）創(chuàng)建<strong>DDL觸發(fā)器</strong>，在當(dāng)前數(shù)據(jù)庫中不允許刪除或修改表 create trigger data on database for drop_table, alter_table as print '不允許刪除或修改表' rollback View Code

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不要看他人高薪；且看閑時(shí)誰在拼

轉(zhuǎn)載于:https://www.cnblogs.com/BoKeYuan259/p/10911517.html

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