SQL SERVER 删除前先判断指定的表或者存储过程是否存在

CREATE PROCEDURE proc_pr  ---将create修改成alter可以修改存储过程；
AS
BEGIN
IF EXISTS(SELECT * FROM sysobjects WHERE TYPE='U' AND NAME='te')
BEGIN
PRINT '存在要删除的表te';
DROP TABLE te;
PRINT '已经删除表te';
END
ELSE
PRINT '不存在表te';

IF EXISTS(SELECT * FROM sysobjects WHERE TYPE='P' AND NAME='proc_jc')
BEGIN
PRINT '存在要删除的存储过程proc_jc';
DROP PROCEDURE proc_jc;
PRINT '已经删除存储过程proc_jc';
END
ELSE
PRINT '不存在存储过程proc_jc';
END

EXEC proc_pr;

SELECT * FROM sysobjects WHERE TYPE='P' and name='proc_pr';

SELECT * FROM sysobjects WHERE TYPE='U' and name='te';

DROP PROCEDURE proc_pr;