SQL Server判断数据库、表、存储过程、函数是否存在

--1.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]  
  
--2.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]  
  
--3.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]  
  
--4.判断函数是否存在  
IF OBJECT_ID(N'函数名') IS NOT NULL  
    DROP FUNCTION dnt_split  
  
---5.判断数据库是否开启了全文搜索  
SELECT DATABASEPROPERTY('数据库名', 'isfulltextenabled')  
  
--6.判断全文目录是否存在  
SELECT *  
FROM   sysfulltextcatalogs  
WHERE  NAME = '全文目录名称'  
  
--7.判断要建立临时表是否存在  
IF OBJECT_ID('临时表') IS NOT NULL  
BEGIN  
    PRINT '存在'  
END  
ELSE  
BEGIN  
    PRINT '不存在'  
END  
  
-- 8.判断要建立的视图名是否存在  
IF EXISTS (  
       SELECT *  
       FROM   dbo.sysobjects  
       WHERE  id = OBJECT_ID(N'[dbo].[视图名]')  
              AND OBJECTPROPERTY(id, N'IsView') = 1  
   )  
    DROP VIEW [dbo].[视图名]  
 --9.判断table1中是否存在name字段        
IF EXISTS(  
       SELECT *  
       FROM   syscolumns  
       WHERE  id = OBJECT_ID('table1')  
              AND NAME = 'name'  
   )  
BEGIN  
    SELECT *  
    FROM   table1;  
END       
   
--10.判断table1中是否存在name字段且删除字段     
IF EXISTS(  
       SELECT *  
       FROM   syscolumns  
       WHERE  id = OBJECT_ID('table1')  
              AND NAME = 'name'  
   )  
BEGIN  
    SELECT *  
    FROM   table1;   
    ALTER TABLE table1 DROP COLUMN NAME  
END