使用SQL语句清空数据库所有表的数据

plantegg

　　近来发现数据库过大,空间不足,因此打算将数据库的数据进行全面的清理,但表非常多,一张一张的清空,实在麻烦,因此就想利用SQL语句一次清空所有数据.找到了三种方法进行清空.使用的数据库为MS SQL SERVER.
　　1.搜索出所有表名,构造为一条SQL语句

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1declare @trun_name varchar(8000)

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1set @trun_name=''

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1select @trun_name=@trun_name + 'truncate table ' + [name] + ' ' from sysobjects where xtype='U' and status > 0

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1exec (@trun_name)

　　该方法适合表不是非常多的情况,否则表数量过多,超过字符串的长度,不能进行完全清理.
　　2.利用游标清理所有表

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1declare @trun_name varchar(50)

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1declare name_cursor cursor for

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1select 'truncate table ' + name from sysobjects where xtype='U' and status > 0

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1open name_cursor

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1fetch next from name_cursor into @trun_name

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1while @@FETCH_STATUS = 0

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1begin

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1exec (@trun_name)

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1print 'truncated table ' + @trun_name

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1fetch next from name_cursor into @trun_name

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1end

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1close name_cursor

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1deallocate name_cursor

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1

　　这是我自己构造的,可以做为存储过程调用, 能够一次清空所有表的数据,并且还可以进行有选择的清空表.
　　3.利用微软未公开的存储过程

http://image57.360doc.com/DownloadImg/2012/12/1910/29021121_1exec sp_msforeachtable "truncate table ?"

　　该方法可以一次清空所有表,但不能加过滤条件.