DROP PROCEDURE throws syntax error

问题

I have a #temp table where I have names of stored procedures.

DECLARE @object VARCHAR(200)
SET @object = (SELECT Top 1 Te.[this Object...] From #Temp Te)

IF OBJECT_ID(@object) IS NOT NULL
    DROP PROCEDURE @object

But on last step I get error

Incorrect syntax near '@object'.

Is this because @object is of type VARCHAR or what ?

This is for SQL Server 2012

回答1:

you can't do it like that. You need to use dynamic sql. Something like :

DECLARE @object NVARCHAR(200)
DECLARE @sql NVARCHAR(max)
SET @object = (SELECT Top 1 Te.[this Object...] From #Temp Te)
IF OBJECT_ID(@object) IS NOT NULL
BEGIN
    SET @sql = 'DROP PROCEDURE ' + @object
    sp_executesql @sql
END

回答2:

Have a look here:

https://dba.stackexchange.com/questions/47186/how-can-i-drop-a-stored-procedure-whose-name-is-in-a-variable

You need to write an sql statement and execute it seperately.

Part from that answer:

declare @sql varchar(64);

set @sql = 'drop proc ' + @stored_procedure_name;

exec(@sql);

And you can replace @stored_procedure_name with @object

回答3:

DROP PROCEDURE needs an object not an varchar

try:

EXECUTE ('DROP PROCEDURE ' + @object)

来源：https://stackoverflow.com/questions/38744149/drop-procedure-throws-syntax-error