sqlserver 使用游标拆表

```sql

--目标：使用游标将一张表拆成两张父[dbo.ra_device]子[dbo.ra_device_detail]表

 

--查看表结构

sp_help  ra_device_detail 

 

 

--为父子表各添加字段

alter table dbo.ra_device add row_id nchar(200);

alter table dbo.ra_device add update_time datetime;

alter table dbo.ra_device add is_del tinyint default 0;

alter table dbo.ra_device add s_id nchar(200);

 

alter table dbo.ra_device_detail add row_id nchar(200);

alter table dbo.ra_device_detail add update_time datetime;

alter table dbo.ra_device_detail add is_del tinyint default 0;

alter table dbo.ra_device_detail add s_id nchar(200);

 

select *  from dbo.ra_demo

select * from dbo.ra_device_detail

select * from dbo.ra_device

truncate table dbo.ra_device

 

 

 

--下为父子表游标SQL

 

 

DECLARE @ID nchar(200) 

, @BU nchar(200)  

, @Productname NVARCHAR(1000) 

, @Producttype NVARCHAR(1000)  

, @ref_num nchar(200) 

, @producttype1 nchar(200)  

, @producttype2 nchar(200) 

, @reviewer NVARCHAR(1000)

, @review_dept NVARCHAR(1000) 

, @re_date date

, @v_id nchar(200)

, @v_time datetime

--shang父子表变量分割线--

, @re_file NVARCHAR(1000) 

, @re_content NVARCHAR(1000)

, @re_type NVARCHAR(1000) 

, @comment NVARCHAR(1000);

 

DECLARE mycursor CURSOR  

FOR  

    SELECT ID,BU,Productname,Producttype,ref_num,producttype1,producttype2,reviewer,review_dept,re_date,re_file,re_content,re_type,comment FROM ra_demo 

--为变量赋值

set @v_id = 0;

set @v_time = GETDATE();

OPEN mycursor  --打开游标       

--从游标里取出数赋值到我们刚才声明的变量中(移动游标指向到第一条数据，提取第一条数据存放在变量中)    

FETCH NEXT FROM mycursor INTO @ID, @BU,@Productname,@Producttype,@ref_num,@producttype1,@producttype2,@reviewer,@review_dept,@re_date,@re_file,@re_content,@re_type,@comment;

--判断游标的状态    

-- 0 fetch语句成功        

---1 fetch语句失败或此行不在结果集中        

---2 被提取的行不存在    

WHILE @@fetch_status = 0   --如果上一次操作成功则继续循环

    BEGIN        

        --显示出我们每次用游标取出的值     

        --print (@Id+'--------'+@UserName+'--------'+@Password+'----'+@NickName)

        --条件判断

       set @v_id = @v_id+1;

--父表插入

            INSERT INTO ra_device(ID,BU,Productname,Producttype,ref_num,producttype1,producttype2,reviewer,review_dept,re_date,row_id,p_id,update_time)VALUES(@ID, @BU,@Productname,@Producttype,@ref_num,@producttype1,@producttype2,@reviewer,@review_dept,@re_date,@v_id,@v_id,@v_time)

        --子表插入

INSERT INTO ra_device_detail(ID,ref_num,re_file,re_content,re_type,comment,row_id,s_id,update_time)VALUES(@ID,@ref_num,@re_file,cast(@re_content as ntext),@re_type,cast(@comment as ntext),@v_id,@v_id,@v_time);

        

        --用游标去取下一条记录(继续取下一行数据)

FETCH NEXT FROM mycursor INTO @ID, @BU,@Productname,@Producttype,@ref_num,@producttype1,@producttype2,@reviewer,@review_dept,@re_date,@re_file,@re_content,@re_type,@comment;

END

--打印总插入行数

print(@v_id)

CLOSE mycursor; --关闭游标     

DEALLOCATE mycursor; --撤销游标(释放资源 )

```