sql server 判断是否存在数据库，表，列，视图

sql判断存储过程是否存在判断数据库教程是否存在Sql代码if exists (select * from sys.databases where name = ’数据库名’)    drop database [数据库名]  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Sql代码if exists (select * from sysobjects where id = object_id(N’[表名]’) and OBJECTPROPERTY(id, N’IsUserTable’) = 1)    drop table [表名]  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Sql代码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]  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]判断临时表是否存在Sql代码if object_id(’tempdb..#临时表名’) is not null      drop table #临时表名  if object_id(’tempdb..#临时表名’) is not null    drop table #临时表名判断视图是否存在Sql代码--SQL Server 2000   IF EXISTS (SELECT * FROM sysviews WHERE object_id = ’[dbo].[视图名]’  --SQL Server 2005   IF EXISTS (SELECT * FROM sys.views WHERE object_id = ’[dbo].[视图名]’  --SQL Server 2000IF EXISTS (SELECT * FROM sysviews WHERE object_id = ’[dbo].[视图名]’--SQL Server 2005IF EXISTS (SELECT * FROM sys.views WHERE object_id = ’[dbo].[视图名]’判断函数是否存在Sql代码--  判断要创建的函数名是否存在      if exists (select * from dbo.sysobjects where id = object_id(N’[dbo].[函数名]’) and xtype in (N’FN’, N’IF’, N’TF’))      drop function [dbo].[函数名]    --  判断要创建的函数名是否存在    if exists (select * from dbo.sysobjects where id = object_id(N’[dbo].[函数名]’) and xtype in (N’FN’, N’IF’, N’TF’))    drop function [dbo].[函数名]  获取用户创建的对象信息Sql代码SELECT [name],[id],crdate FROM sysobjects where xtype=’U’   /*  xtype 的表示参数类型，通常包括如下这些  C = CHECK 约束  D = 默认值或 DEFAULT 约束  F = FOREIGN KEY 约束  L = 日志  FN = 标量函数  IF = 内嵌表函数  P = 存储过程  PK = PRIMARY KEY 约束（类型是 K）  RF = 复制筛选存储过程  S = 系统表  TF = 表函数  TR = 触发器  U = 用户表  UQ = UNIQUE 约束（类型是 K）  V = 视图  X = 扩展存储过程  */  SELECT [name],[id],crdate FROM sysobjects where xtype=’U’/*xtype 的表示参数类型，通常包括如下这些C = CHECK 约束D = 默认值或 DEFAULT 约束F = FOREIGN KEY 约束L = 日志FN = 标量函数IF = 内嵌表函数P = 存储过程PK = PRIMARY KEY 约束（类型是 K）RF = 复制筛选存储过程S = 系统表TF = 表函数TR = 触发器U = 用户表UQ = UNIQUE 约束（类型是 K）V = 视图X = 扩展存储过程*/判断列是否存在Sql代码if exists(select * from syscolumns where id=object_id(’表名’) and name=’列名’)    alter table 表名 drop column 列名  if exists(select * from syscolumns where id=object_id(’表名’) and name=’列名’)  alter table 表名 drop column 列名判断列是否自增列Sql代码if columnproperty(object_id(’table’),’col’,’IsIdentity’)=1    print ’自增列’  else    print ’不是自增列’   SELECT * FROM sys.columns WHERE object_id=OBJECT_ID(’表名’)  AND is_identity=1  if columnproperty(object_id(’table’),’col’,’IsIdentity’)=1  print ’自增列’else  print ’不是自增列’SELECT * FROM sys.columns WHERE object_id=OBJECT_ID(’表名’)AND is_identity=1判断表中是否存在索引Sql代码if exists(select * from sysindexes where id=object_id(’表名’) and name=’索引名’)      print  ’存在’    else      print  ’不存在  if exists(select * from sysindexes where id=object_id(’表名’) and name=’索引名’)    print  ’存在’  else    print  ’不存在查看数据库中对象Sql代码SELECT * FROM sys.sysobjects WHERE name=’对象名’  SELECT * FROM sys.sysobjects WHERE name=’对象名’

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