删除表的存储过程 [英] Stored procedure to drop table

问题描述

我创建了一个存储过程，如果它存在于数据库中，它将删除一个表.使用 EXEC 运行存储过程时，出现以下错误:

I have created a stored procedure that will drop a table if it exists in a database. When running the stored procedure with EXEC, I am getting the following error:

消息 203，级别 16，状态 2，程序sp_DropIfExists，第 13 行名称 'IF存在(从 sys.objects 中选择 1OBJECT_ID = OBJECT_ID(N'table_name')AND type = (N'U')) 删除表[table_name]' 无效标识符.

Msg 203, Level 16, State 2, Procedure sp_DropIfExists, Line 13 The name 'IF EXISTS(SELECT 1 FROM sys.objects WHERE OBJECT_ID = OBJECT_ID(N'table_name') AND type = (N'U')) DROP TABLE [table_name]' is not a valid identifier.

但是，如果我将生成的 T-SQL 复制并粘贴到 management studio 中，它似乎运行良好.有人可以解释为什么这是无效的吗?修复会很好，但我真的主要是在追求为什么，尽管如此会很好！提前致谢.

However if i copy and paste the T-SQL that is generated into management studio, it seems to be running fine. Can someone explain why this is not valid? The fix would be nice, but I am really after the Why primarily, The How would be nice to though! Thanks in advance.

ALTER PROCEDURE [dbo].[sp_DropIfExists](@tableName VARCHAR(255)) 
AS
BEGIN
    SET NOCOUNT ON;
    DECLARE @SQL VARCHAR(MAX);
    SET @SQL = 'IF EXISTS(SELECT 1 FROM sys.objects WHERE OBJECT_ID = OBJECT_ID(N''' + @tableName + ''') AND type = (N''U'')) DROP TABLE [' + @tableName + ']'
    PRINT @SQL;
    EXEC @SQL;
END

推荐答案

你可以使用sp_execute

sp_executesql @SQL

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