MSSQL动态语句极致操控游标(mssql游标动态语句)

MSSQL动态语句极致操控游标

游标的概念不解释了,大家都比较熟悉,在MSSQL中有三种游标,分别是静态游标、只读游标、可更新游标。在这里,我将重点介绍MSSQL动态语句极致操控游标。

MSSQL动态语句极致操控游标,不仅可以完成select/insert/update/delete等常规操作,还可以更精细地操作游标。下面是用SQL语句动态操作游标的具体步骤:

第一步:定义游标

“`sql

declare c_articles cursor

for

select article_title from articles;


第二步:打开游标
```spec
open c_articles

第三步:借助游标循环取出数据

“`sql

fetch next from c_articles into @article_title

while @@fetch_status=0

begin

select @article_title

fetch next from c_articles into @article_title

end


第四步:关闭游标
```sql
close c_articles

第五步:释放游标

“`sql

dealloc c_articles


只要你用上述五步,你就可以通过MSSQL动态语句极致操控游标,完成完美的分页结果展示!看一看POST文章的SQL动态语句:

```sql
declare @count int
select @count=count(*) from articles

declare @count_max int
set @count_max=@count
declare @count_pages int
select @count_pages=@count_max/10
declare @per_pages int
if(@count_max%10>0)
set @per_pages=@count_pages+1
else
set @per_pages=@count_pages

declare @count_current int
set @count_current=1
declare c_articles cursor
for
select article_content,article_title from articles
order by article_id

open c_articles
fetch next from c_articles into @article_title,@article_content

while @@fetch_status=0
begin
if @count_current=1
select @article_content,@article_title

if @count_current=@per_pages
break;

if @count_current
select @article_content,@article_title

set @count_current=@count_current+1
fetch next from c_articles into @article_title,@article_content
end
close c_articles
dealloc c_articles

通过上述SQL语句,我们可以将POST文章进行分页,从而实现文章的页面展示,提供更好的MSSQL动态语句极致操控游标的体验。


数据运维技术 » MSSQL动态语句极致操控游标(mssql游标动态语句)