SQL server存储过程，触发器，游标相关实例

 use MySchool
 go

 alter proc P_stu
 @pass int= 60
 as
     select AVG(StudentResult)as 平均分
     from Result

     select * from Result
     where StudentResult< @pass
     go

     exec P_stu

     go

 ---创建带输出参数的存储过程

 select * from Result
 go 

 alter procedure p_res
 @newId varchar(20) output
 as
     declare @max varchar(20)

     select @max=MAX(StudentNo) from Result
     where YEAR(ExamDate)  = YEAR(GETDATE())
     and month(ExamDate)  = month(GETDATE())
     and day(ExamDate)  = day(GETDATE())

     if (@max is null)
     set @newId = CONVERT(varchar(100),GETDATE(),23)+''
     else
     begin
         declare @right int
         set @right = CONVERT(int,right(@max,3))
         set @right = @right +1
         set @newId = CONVERT(varchar(100),GETDATE(),23)+'-'+(case when @right < 10 then '' when @right<100 then '' end)+ CONVERT(varchar(10),@right)

     end
     go

     declare @rst varchar(20)
     exec p_res  @rst output
     print @rst 

     --动态存储过程的数据处理

     --分页存储过程
     --要求
         --可输入每页显示条数，默认每页条
         --可输入页码进行查询
         --可输入条件查询
         --可输入表名
         --可输入列名
         --可输入排序列
         --返回总记录数
         --返回总页数
         --返回查询到的结果
   select * from Subject
   go 

   if exists(select * from sysobjects
     where name = 'p_Mypage')
     drop procedure p_Mypage
     go

   create proc p_Mypage
   @tableName varchar(20),
   @Fields varchar(200),
   @orderFields varchar(200),
   @where varchar(200),
   @pageSize int = 5,
   @pageIndex int = 1,
   @RecordCount int output,
   @PageCount int output

   with encryption--文本加密
   --with recomple--每次都重新编译
   as

     declare @sql nvarchar(4000)

     set @sql = 'select @RecordCount=count(*) from'+ @tableName+'where 1= 1'+ISNULL(@where,' ')

     exec sp_executesql @sql,N'@RecordCount int output',@RecordCount output
     set @PageCount = ceiling((@RecordCount+0.0)/@pageSize)、

     set @sql = '
     select * from(
     select top  '+ CONVERT(varchar(10),@pageSize)+' '+@Fields+' from(
     select top '+ CONVERT(varchar(10),@pageSize*@pageIndex)+' * from '+@tableName+'
     where 1= 1'+ISNULL(@where,' ')+'
     order by '+@orderFields+' )as a
     order by a.'+@orderFields+' desc) as b
     order by b.SubjectNo'

     exec (@sql)

     declare @a int ,@b int
     exec p_Mypage @tableName= 'Subject',@Fields = '*',
         @orderFields = 'SubjectNo',@where=null,
         @pageSize = 5,@pageIndex = 2,@RecordCount = @a output,
         @PageCount = @b output
     print @a
     print @b

     --游标

  declare sur_stu cursor scroll for
  select StudentName from Student for read only
  open sur_stu

  declare @name varchar(20)
  declare @i int
  set @i = 1;
  fetch next from cur_stu into @name
  while(@@FETCH_STATUS<> -1)
  begin
     if(@i = 3)
     begin
         print @name
         set @i=0
         end
     fetch next from cur_stu into @name
     set @i=@i  +1

 end

 close sur_stu
 deallocate sur_stu

 --使用游标和查存储过程创建分页  性能最差
 create procedure sqlPage
 @sql nvarchar (4000),
 @pageIndex int,
 @pageSize int,
 @recordCount int output,
 @pageCount int output
 as
     declare @p1 int
     exec sp_cursoropen @p1 output,@sql,@scrollopt= 1, @ccopt = 1,@rowcount= @recordCount output
     set @pageCount = CEILING((@recordCount+0.0)/@pageSize)
     exec sp_cursorfetch @p1,16,@pageIndex,@pageSize
     exec sp_cursorclose @p1

 declare @a int ,@b int
 exec sqlPage 'select * from student',1,5,@a output,@b output
 print @a
 print @b