sql中判断是否存在 数据库、表、存储过程、函数

判断数据库是否存在
if exists (select * from sys.databases where name = '数据库名')
drop database [数据库名]
判断表是否存在
if exists (select * from sysobjects where id = object_id(N'[表名]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [表名]

判断存储过程是否存在
if exists (select * from sysobjects where id = object_id(N'[存储过程名]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [存储过程名]

判断函数是否存在
IF OBJECT_ID (N'函数名') IS NOT NULL
DROP FUNCTION dnt_split

判断数据库是否开启了全文搜索
select databaseproperty('数据库名','isfulltextenabled')

判断全文目录是否存在
select * from sysfulltextcatalogs where name ='全文目录名称'