Question

如何更改我的T-SQL查询，以便不会发生此错误：

'XML数据类型方法“value”的参数1必须是字符串文字'。

T-SQL代码：

Declare @Count Int = 1
While(@count <= @j)
Begin
insert into mytable
([Word])
Select ([XmlColumn].value(N'word['+Cast(@Count as nvarchar(2))+']/@Entry','nvarchar(max)'))
    from OtherTable WHERE ID=2

Answer 1

您必须隐式使用sql变量：

Declare @Count Int = 1
While(@count <= @j)
Begin
insert into mytable
([Word])
Select ([XmlColumn].value('(/word[sql:variable("@Count")]/@Entry)[1]','nvarchar(max)'))
    from OtherTable WHERE ID=2

Answer 2

您可以删除while循环并使用nodes一次性插入以粉碎XML。

insert into mytable([Word])
select N.value('@Entry', 'nvarchar(max)')
from OtherTable
  cross apply XmlColumn.nodes('word') as T(N)
where ID = 2

如果@j限制要插入mytable的行数，则可以使用此代码。

insert into mytable([Word])
select ID
from
  (
    select N.value('@Entry', 'nvarchar(max)') as ID, 
           row_number() over(order by T.N) as rn
    from OtherTable
      cross apply XmlColumn.nodes('word') as T(N)
    where ID = 2
  ) T
where rn <= @j

如果你出于某种原因真的想要使用循环，那么你可以这样做。

while @Count <= @j
begin
  insert into mytable([Word])
  select XMLColumn.value('(/word[sql:variable("@Count")]/@Entry)[1]', 'nvarchar(max)')
  from OtherTable
  where ID = 2

XML数据类型方法“value”的参数1必须是字符串文字

2 个答案: