sp_executesql的拋出錯誤，但簡單EXEC（）的作品

Question

我需要動態的方式創建用戶定義的類型，但

的exec()方式：

-- This works 
DECLARE @column NVARCHAR(MAX) = 'Id INT' 
EXEC ('CREATE TYPE dbo.MyDataType AS TABLE ('+ @column +')') 

的sp_executesql方式：

-- This does not work 
DECLARE @column NVARCHAR(MAX) = 'Id INT' 
EXECUTE sp_executesql N'CREATE TYPE dbo.MyDataType AS TABLE (@column)', @column; 

錯誤：

Msg 102, Level 15, State 1, Line 1
Incorrect syntax near 'Id'.

Msg 102, Level 15, State 1, Line 1
Incorrect syntax near '@column'.

我錯過了什麼？

Answer 1

您需要甚至可以使用動態SQL時服用的sp_executesql方法：

DECLARE @column NVARCHAR(MAX) = N'Id INT' 
DECLARE @sql NVARCHAR(MAX) 
SET @sql = 'CREATE TYPE dbo.MyDataType AS TABLE (' + @column + ')' 
EXECUTE sp_executesql @sql 

您可以傳遞參數的定義和值到sp_executesql，像這樣：

DECLARE @IntVariable int; 
DECLARE @SQLString nvarchar(500); 
DECLARE @ParmDefinition nvarchar(500); 

/* Build the SQL string one time.*/ 
SET @SQLString = 
    N'SELECT BusinessEntityID, NationalIDNumber, JobTitle, LoginID 
     FROM AdventureWorks2012.HumanResources.Employee 
     WHERE BusinessEntityID = @BusinessEntityID'; 
SET @ParmDefinition = N'@BusinessEntityID tinyint'; 

/* Execute the string with the first parameter value. */ 
SET @IntVariable = 197; 
EXECUTE sp_executesql @SQLString, @ParmDefinition, 
         @BusinessEntityID = @IntVariable; 

/* Execute the same string with the second parameter value. */ 
SET @IntVariable = 109; 
EXECUTE sp_executesql @SQLString, @ParmDefinition, 
         @BusinessEntityID = @IntVariable; 

（從MSDN page上sp_executesql ）

但我認爲這不符合您的使用案例。