Question

访问数据库时，我收到此错误：

基础提供商失败

代码：

drop table #T;
set nocount on;
create table #T (pk int identity primary key, val int);
insert into #T(val) values (2), (5), (11), (3), (7), (2), (5), (11), (3), (7);
delete t from #T t where t.val in (5, 7);
select *, ROW_NUMBER() over (order by t.pk) as rn 
from #T t 
order by t.pk;

declare @val int, @pk int, @rn int;
set identity_insert #T on;
DECLARE csr CURSOR FOR   
    select t.pk, t.val, ROW_NUMBER() over (order by t.pk) as rn 
    from #T t 
    order by t.pk;
    OPEN csr 
    FETCH NEXT FROM csr   
    INTO  @pk, @val, @rn;
    WHILE @@FETCH_STATUS = 0  
    BEGIN
        --select @pk as pk,  @val as val, @rn as rn         
        if(@pk <> @rn)
        begin
          insert into #T(pk, val) values (@rn, @val);
          delete #T where pk = @pk;
        end
        FETCH NEXT FROM csr   
        INTO  @pk, @val, @rn;
    END
    CLOSE csr;  
DEALLOCATE csr;
set identity_insert #T off;
select * 
from #T t 
order by t.pk;
DBCC CHECKIDENT ('#T', RESEED, @rn);
insert into #T(val) values (77);
select * 
from #T t 
order by t.pk;
drop table #t;

Answer 1

这似乎是与数据库相关的问题，请重新检查您的权限和数据库连接字符串。

底层提供程序在Open in Entity Framework中失败

1 个答案: