SqlServer 游标用法

declare @gonghao  nvarchar(50)
declare @LowValueAssetsID  nvarchar(50)
declare @CreateTime dateTime
declare user_cur cursor for select LowValueAssetsID,gonghao,CreateTime from LowValueAssets 
open user_cur 
while @@fetch_status=0 
begin
--读取游标 
    fetch next from user_cur into @LowValueAssetsID,@gonghao,@CreateTime 

--set @gonghao = (select Gonghao from LowValueAssets  ls  where ls.LowValueAssetsID = @LowValueAssetsID) --工号

declare @Depart  nvarchar(50) --部门
declare @Name  nvarchar(200) --名称
--depart
set @Depart =(select  distinct  Depart from Staffers  s inner join LowValueAssets  l on l.Gonghao = s.EmpID
where l.Gonghao =@gonghao)
--name
set @Name =(select  distinct  s.ChineseName from Staffers  s inner join LowValueAssets  l on l.Gonghao = s.EmpID
where l.Gonghao =@gonghao)

insert into LowValueAssetslinkEmpID (LowValueAssetsID,OwnEmpID,OwnDepart,OwnName,CreateTime) 
values(@LowValueAssetsID,@gonghao,@Depart,@Name,@CreateTime)
end
close user_cur 
--摧毁游标 
deallocate user_cur

补充别人讲解的游标

create table student
(
id int identity(1,1) primary key,  --自动增长编号
name varchar(20) not null,         --姓名
age int not null,                  --年龄
address  varchar(100) not null,    --地址
)


使用游标有4个过程：声明游标、打开游标、提取数据、关闭游标。


declare pcurr cursor for  --声明一个名为pcurr游标
declare @customer nvarchar(50)
declare @age int


select name,age from student --这个查询结果非常重要，这个就是我们需要用游标读取的数据集

open pcurr  --打开游标
fetch next from pcurr into @customer,@age
while (@@fetch_status = 0) --判断游标是否读取完毕，读取完毕，这里将返回100而不是0
begin
print (@customer)
print  (@age)
fetch next from pcurr into @customer,@age --取值，由于我们全面的结果集返回返回的是2行记录，这里我们就需要2个自定义参数去取出结果集
close pcurr  --关闭游标
deallocate pcurr --释放游标

close 与 deallocate 的不同点：
close是关闭游标