--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.判断要创建临时表是否存在
IF OBJECT_ID('临时表') IS NOT NULL
BEGIN
PRINT '存在'
END
ELSE
BEGIN
PRINT '不存在'
END
-- 8.判断要创建的视图名是否存在
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
