1.存储过程
--存储过程 优点:预编译、批处理(SQL预先存放在服务器上面的数据结构,减少网络流通)procedure
create procedure proc_register
(
@name varchar(50),
@pwd varchar(50),
@remark varchar(100)
)
as
begin
insert into EFCoreDemo.dbo.Users(username,password,remark)
values(@name,@pwd,@remark)
return @@IDENTITY
end;
declare @test int
exec @test = proc_register '侧测试','123','备注'
select @test
select * from EFCoreDemo.dbo.Users
drop procedure proc_register
2.游标
--游标 只进游标、静态游标、动态游标
declare cursor_userinfo cursor --只进游标
for
select Id, UserName, Password, Remark from EFCoreDemo.dbo.Users
open cursor_userinfo --局部游标、全局游标(global) 前提,几个存储过程,都在一次会话 全局游标都可以被调用
declare @id int,@username varchar(50),@password varchar(50),@remark varchar(100)
fetch next from cursor_userinfo into @id,@username,@password,@remark
print cast(@id as varchar)+'-'+@username+'-'+@password+'-'+@remark
close cursor_userinfo
deallocate cursor_userinfo --释放资源
--循环执行
declare @id int,@username varchar(50),@password varchar(50),@remark varchar(100)
fetch next from cursor_userinfo into @id,@username,@password,@remark
while @@FETCH_STATUS =0 --判断状态是否执行成功
begin
print cast(@id as varchar)+'-'+@username+'-'+@password+'-'+@remark
fetch next from cursor_userinfo into @id,@username,@password,@remark
end
3.触发器
--触发器的使用
--临时表 在一次批处理中产生的临时内存结构
--inserted:新数据信息记录 deleted 旧的数据信息记录
--insert delete update 对数据产生影响
--添加、删除 添加+删除
create trigger tri_user
on EFCoreDemo.dbo.Users
for insert --受约束限制delete,update instead of insert 不受限
as
begin
declare @id int --定义一个用户编号
select @id=id from inserted
--插入日志表
insert into Logs(logContent,id)
values('添加动作',@id)
end
insert into EFCoreDemo.dbo.Users(Id, UserName, Password, Remark) values(103,'领导','123','fer');