sp_executesql 抛出错误但简单的 EXEC() 有效

Question

我需要以动态方式创建用户定义的类型，但是

exec()方式：

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

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;

错误：

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

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

我错过了什么？

Answer 1

即使采用 sp_executesql 方法，您也需要使用动态 SQL：

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

您可以将参数定义和值传递给 sp_executesql，如下所示：

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;

（来自 sp_executesql 上的 MSDN page）

但我认为这不适合您的用例。

sp_executesql 抛出错误但简单的 EXEC() 有效

sp_executesql throws error but simple EXEC() works

sql-server-2008

dynamic-sql

sp-executesql