sql - 如何在此 sql 查询中传递参数

Question

Select  
    CAST(
        CAST(N'' AS XML).value(
            'xs:base64Binary("MA==")'
          , 'VARBINARY(MAX)'
        ) 
        AS VARCHAR(MAX)
    )   ASCIIEncoding
;

---

Declare @Value nvarchar(10)
set @Value ='MA=='
Select  
    CAST(
        CAST(N'' AS XML).value(
            'xs:base64Binary("@Value")'
          , 'VARBINARY(MAX)'
        ) 
        AS VARCHAR(MAX)
    )   ASCIIEncoding
;

收到错误

Answer 1

这有效：

Declare @Value nvarchar(10)
set @Value ='MA=='
Select  
    CAST(
        CAST(N'' AS XML).value(
            'xs:base64Binary(sql:variable("@Value"))'
          , 'VARBINARY(MAX)'
        ) 
        AS VARCHAR(MAX)
    )   ASCIIEncoding
;