SQL笔记 [SQL判断是否存在] [长期更新] (-2015.4)

--判断某个存储过程是否存在
if exists (select * from sysobjects where id = object_id(N'[p_CreateTable]') and 
        OBJECTPROPERTY(id, N'IsProcedure') = 1)  
  drop procedure [p_CreateTable] 
--create proc p_CreateTable 
--as
--create table tUser(cid nvarchar(50),name nvarchar(50),age int,dept nvarchar(50))
  
--EXEC('p_CreateTable')


--判断数据库dbA是否存在
--create database dbA
if exists (select * from sys.databases where name = 'dbA')  
  drop database [dbA]
  
--判断表tableA是否存在
--CREATE TABLE tableA(id NVARCHAR(50),name NVARCHAR(50))
if exists (select * from sysobjects where id = object_id(N'[tableA]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)  
  drop table [tableA]   

--判断存储过程p_CreateTable是否存在
--create proc p_CreateTable as
--create table user(cid nvarchar(50),name nvarchar(50),age int,dept nvarchar(50))
--EXEC('p_CreateTable')
if exists (select * from sysobjects where id = object_id(N'[p_CreateTable]') 
and OBJECTPROPERTY(id, N'IsProcedure') = 1)  
  drop procedure [p_CreateTable] 
  
--判断视图v_tableAB是否存在
--CREATE VIEW v_tableAB AS
--SELECT a.id,a.NAME FROM tableA a
  
IF EXISTS (SELECT * FROM sys.views WHERE NAME='v_tableAB')
    DROP VIEW v_tableAB --PRINT '存在'

--判断表tableA中的列column1是否存在
--CREATE TABLE tableA(id NVARCHAR(50),NAME NVARCHAR(50))--测试数据
if exists(select * from syscolumns where id=object_id('tableA') and name='column1')  
  alter table tableA drop column column1 

--判断表tableA是否存在索引Index1
create index Index1 on tableA(id,name)--(创建索引)在ID NAME 两个字段上创建非聚集索引
 
if exists(select * from sysindexes where id=object_id('tableA') and name='index1') 
--if exists(select name from sys.indexes where name = N'Index1') 
DROP INDEX Index1 on tableA --删除索引  

select *from sys.indexes where name = 'Index1'--查看索引




--创建临时表(仅缓存在执行SQL的时候)
DECLARE @tableA TABLE(id NVARCHAR(50),NAME NVARCHAR(50))
INSERT INTO @tableA(id,name)VALUES ('aaa','bbb')
SELECT * FROM @tableA 

   

--建库:
------------------------------------------------------------------------
use master
go

if exists(select * from sys.databases where name='CareDB')
    drop database CareDB
go

create database CareDB
on(
name='CareDB_Data',
filename='E:\DB\CareDB_Data.mdf'
)
log on(
name='CareDB_Data_Log',
filename='E:\DB\CareDB_Data.ldf'
)
go

--建表:
------------------------------------------------------------------------
use CareDB

if exists(select * from sysobjects where name='LargeDatas')
drop table LargeDatas
go

create table LargeDatas(
 ID varchar(36),
[FileName] varchar(100),
Content image,
Descriptions varchar(100)
)
go