Question

获取错误列名称无效＆＃39; @ ColumnNames＆＃39;。在最后一行（插入子句），任何想法为什么？

Declare @ColumnNames varchar(2000)
Declare @OrderId int
set @OrderId = 110077

select @ColumnNames = COALESCE(@ColumnNames + ', ', '') + COLUMN_NAME
    from 
        INFORMATION_SCHEMA.COLUMNS
    where 
        TABLE_NAME='OrderItems'

Insert into dbo.OrderHistory(@ColumnNames) select * from dbo.[Order] where ID= @OrderId

Answer 1

@ColumnNames是一个文本字符串，而不是列的列表。因此，当您尝试将其用作插入查询中的列名列表时，它将失败。

您可以使用动态SQL来执行您想要的操作，例如：

declare @insertquery nvarchar(1000)
set @insertquery = N'insert into dbo.orderhistory(' + @ColumnNames + ') select * from dbo.[Order] where ID=' + cast(@OrderId as nvarchar(10))

sp_executesql @insertquery

Answer 2

你应该使用动态sql。并且不要忘记执行数据构建构建查询字符串！

Declare @ColumnNames varchar(2000)
Declare @OrderId int
set @OrderId = 110077

select @ColumnNames = COALESCE(@ColumnNames + ', ', '') + COLUMN_NAME
    from 
        INFORMATION_SCHEMA.COLUMNS
    where 
        TABLE_NAME='OrderItems'
Declare @DynSqlStatement varchar(max);
set @DynSqlStatement = 'Insert into dbo.OrderHistory('+ @ColumnNames + ') 
      select * from dbo.[Order] where ID= ' + cast(@OrderId as varchar(10));
exec( @DynSqlStatement );

Answer 3

如果您必须从订单表中选择所有列，则无需定义@columnname

在插入查询中动态选择列名

3 个答案: