必须声明标量变量 bcp 错误

Question

alter PROC XML
AS

DECLARE @myXml xml
Declare @SQL nvarchar(2000)

SET @myXml = 'SELECT TOP 1000 *  FROM [xyz].[dbo].[yzx] FOR XML AUTO'
SET @SQL= 'bcp "exec @myXml" QUERYOUT C:\sample.xml -w -r -t -S www -T' 
EXEC Master..xp_CmdShell @SQL

当我运行上面的代码时，我得到如下错误

SQLState = 37000, NativeError = 137
Error = [Microsoft][SQL Server Native Client 11.0][SQL Server]Must declare the scalar variable "@myXml".
SQLState = S1000, NativeError = 0
Error = [Microsoft][SQL Server Native Client 11.0]Unable to resolve column level collations

即使我已经声明了变量，为什么会出现上述错误

Answer 1

您正在使用动态 sql，您需要传递字符串值以执行，我认为您还需要将 xml 类型转换为 varchar，这可能会有所帮助：

CREATE PROCEDURE dbo.Test1    
AS
    SET NOCOUNT ON;
    SELECT TOP 1000 *  FROM [xyz].[dbo].[yzx] FOR XML AUTO
GO

CREATE PROC XML
AS
DECLARE @myXml xml
Declare @SQL nvarchar(2000)

SET @myXml = 'dbo.Test1'
SET @SQL= 'bcp "exec ' + CAST(@myXml AS VARCHAR(max)) + '" QUERYOUT C:\sample.xml -w -r -t -S www -T' 
EXEC Master..xp_CmdShell @SQL