看代码应该是SQL Server的，以后再整理MySql的版本

1、判断是否存在addOneArticle这个存储过程
if Exists(select name from sysobjects where NAME = ‘addOneArticle‘ and type=‘P‘)
drop procedure addOneArticle

2、判断是否存在countAr这个触发器
if exists(select * from dbo.sysobjects where id = object_id(N‘[dbo].[countAr]‘) and OBJECTPROPERTY(id, N‘IsTrigger‘) = 1)
drop trigger countAr

3、判断是否存在View_1这个视图
IF EXISTS (SELECT TABLE_NAME FROM INFORMATION_SCHEMA.VIEWS WHERE TABLE_NAME = N‘View_1‘)
DROP View View_1

4、判断是否存在USER_Fun这个用户函数

(注意此处的type 有两种,分别是‘TF‘-Table-valued Function 表值函数 或‘FN‘-Scalar-valued Function 标量值函数)
if exists(select * from dbo.sysobjects where id = object_id(N‘[dbo].[USER_Fun]‘) and (type = ‘FN‘ or type = ‘TF‘))
DROP FUNCTION USER_Fun

5、判断表‘Tb‘是否存在
if (exists (SELECT * FROM dbo.sysobjects where id = object_id(N‘Tb‘)and OBJECTPROPERTY(id, N‘IsUserTable‘) = 1))
DROP TABLE Tb

6、判断数据库是否存在

if exists( select * from master.dbo.sysdatabases where dbid=db_ID( ‘scbjdb‘ ) )

drop database scbjdb

else

print ‘no exist scbjdb‘

[转]判断存储过程、触发器、视图是否存在并删除