各种小代码片段2
2009-08-16 21:30
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基本函数: 1.len()不取字符串最后的空格个数,但会取字符串中间的空格个数。 datalength()取所有的,包括空格个数 2.reverse()将()里面的字符反过来 3.replicate(a,n)将a重复n次 4.space(n)返回n个空格 5.stuff(a,n1,n2,b)从n1起往a字符串中插入b字符串,n2是要覆盖的个数。如果为0,则只是插入,不覆盖a中的字符。否之。 6.raiserror('',16,1) 抛出消息 7.substring(a,i,j) 取a字符串中从i起,共j个长度的字符。 charindex(a,m) 得到字符串a在字符串m中的起始位置 8.isnull()函数 isnull(a,b) 如果列a为空,则用值b来代替,但并不改变其在数据库中的值。 删除R1表中R2的数据 delete r1 where checksum(*) in (select checksum(*) from r2) 9.exists()函数 如果()中查询语句返回行数为0,则为false,否之则为true. 往a表中添加一列a01 alter table a add a01 int 修改列 alter table pp alter column a varchar(50) 更改字段名 exec sp_rename '表名.字段名','新字段名','column' ALTER TABLE 表名 DISABLE TRIGGER 触发器名 --禁止触发器 ALTER TABLE 表名 ENABLE TRIGGER 触发器名 --允许触发器 EXEC sp_MSforeachtable 'ALTER TABLE ? DISABLE TRIGGER ALL' --禁用数据库中所有表的所有触发器 EXEC sp_MSforeachtable 'ALTER TABLE ? ENABLE TRIGGER ALL' --启用数据库中所有表的所有触发器 --清除所有表主键 EXEC sp_MSforeachtable 'declare @PkName varchar(100) select @PkName=name from sysobjects where xtype=''Pk'' and parent_obj=object_id(''?''); exec(''alter table ? drop constraint ''+@PkName)' go --修改所有表的字段为某字段: EXEC sp_MSforeachtable 'exec sp_rename ''?.收款日期'',''发生日期''' --将数据库中所有表的收款日期改为发生日期 修改text类型字段的值: create table os(SoftIntro text,ID int) insert into os select 'aaa',1004 union all select 'bbb',1003 union all select 'ccc',1002 declare @ptr binary(16) select @ptr=textptr(SoftIntro) from os where id=1002 updatetext os.SoftIntro @ptr null 0 'dddd' select * from os 替换text类型字段的值 create table t(Cbody ntext) insert into t select '324234234深圳罗湖324324' insert into t select '深圳罗湖324324' declare @ptrval binary(16),@star int declare cur cursor for select textptr(Cbody),charindex('深圳罗湖',cbody)-1 from t where cbody like '%深圳罗湖%' open cur fetch next from cur into @ptrval,@star while(@@fetch_status=0) begin declare @sql nvarchar(1000) set @sql='UPDATETEXT t.cbody @ptrval ' +ltrim(@star)+' '+ ltrim(len('深圳罗湖'))+' N''深圳福田''' exec sp_executesql @sql,N'@ptrval binary(16)',@ptrval fetch next from cur into @ptrval,@star end close cur deallocate cur --创建表 create table 表(a1 varchar(10),a2 char(2)) --为表添加描述信息 EXECUTE sp_addextendedproperty N'MS_Description', '人员信息表', N'user', N'dbo', N'table', N'表', NULL, NULL --为字段a1添加描述信息 EXECUTE sp_addextendedproperty N'MS_Description', '姓名', N'user', N'dbo', N'table', N'表', N'column', N'a1' --更新表中列a1的描述属性: EXEC sp_updateextendedproperty 'MS_Description','字段1','user',dbo,'table','表','column',a1 --删除表中列a1的描述属性: EXEC sp_dropextendedproperty 'MS_Description','user',dbo,'table','表','column',a1 --删除测试 drop table 表 取5以下随机的数字 select convert(varchar,ceiling(rand()*5)) 将数字转换成百分比: select rtrim(cast(2 * 100/10 as decimal(5,2))) + '%' cast(2 * 100/10 as decimal(5,2)) 这个是将2*100/10转换成5位且小数位为2位的浮点小数, 11.乘积: declare @s table(id float) insert into @s select 2 insert into @s select 3 insert into @s select 2.5 select exp(sum(log(id))) from @s 12.like的用法 查出记录中的字符串包含1,2,3,4的记录 Create Table TEST (share varchar(100)) Insert TEST Select '1,2,24' Union All Select '2,23,56' Union All Select '6,10,11' Union All Select '3,4,15' Union All Select '6,29,31' GO Select * From TEST Where ',' + share + ',' Like '%,[1-4],%' 13,按条件分类排序 select brand from bra order by case when brand ='飞利浦' then '' else brand end //将brand为飞利浦的排在最上面 14.给返回的记录加上一个行数 (1)当没有自增的id列时: select bh = identity(int,1,1) ,proname,price into temp from product select '第' + cast(bh as varchar) + '个' , proname,price from temp (2)当有自增的id列时 select bh,name,price from ( SELECT bh=(SELECT COUNT(1) FROM product WHERE id > a.id)+ 1,* FROM product a ) t order by bh ---SQL2005启用 openrowset/opendataset exec sp_configure 'show advanced options',1 reconfigure exec sp_configure 'Ad Hoc Distributed Queries',1 reconfigure -- 启用xp_cmdshell -- 允许配置高级选项 EXEC sp_configure 'show advanced options', 1 GO -- 重新配置 RECONFIGURE GO -- 启用xp_cmdshell EXEC sp_configure 'xp_cmdshell', 1 GO --重新配置 RECONFIGURE GO --启动远程服务器的MSDTC服务 exec master..xp_cmdshell 'isql /S"10.128.34.22" /U"sa" /P"123456" /q"exec master..xp_cmdshell ''net start msdtc'',no_output"',no_output --启动本机的MSDTC服务 exec master..xp_cmdshell 'net start msdtc',no_output ---远程链接: 1、创建远程链接服务器,然后进行查询 exec sp_addlinkedserver 'HJZX_SYN','','SQLOLEDB','10.128.34.22' exec sp_addlinkedsrvlogin 'HJZX_SYN','false',null,'sa','123456' go select * from HJZX_SYN.数据库名.dbo.表名 ---删除连接 exec sp_dropserver 'MyLink','droplogins' ---查询 select * from sysservers 2、 select * from openrowset('msdasql','driver={sql server};server=10.124.20.10;uid=ncc2008;pwd=ncc2008',hjzx4.dbo.t_p_order) AS a 3、 select * from opendatasource('sqloledb','Data Source=10.124.20.10;User ID=ncc2008;Password=ncc2008').hjzx4.dbo.t_p_order 如:alter database 数据库名 COLLATE Chinese_PRC_CI_AS 不区分大小写, 而 alter database 数据库名 COLLATE Chinese_PRC_CS_AS 使之区分大小写。 导入excel数据: select * into # from OPENROWSET('microsoft.jet.oledb.4.0','Excel 5.0;hdr=yes;database=d:/1月安排.xls',准考证信息$) insert into 表名 select * from OpenDataSource( 'Microsoft.Jet.OLEDB.4.0','Data Source=f:/Test.xls;User ID=Admin;Password=;Extended properties=Excel 8.0')...[Sheet1$] office2007 SELECT * FROM OPENDATASOURCE('Microsoft.ACE.OLEDB.12.0','Data Source="f:/aa.xls";User ID=admin;Password=;Extended properties=Excel 5.0')...[sheet1$] ----bcp: -t列分割符,默认是以制表符(/t)分割 -r行分割符,默认是以换行符(/n)分割 导入:in EXEC master..xp_cmdshell 'bcp pruduct in d:/wsp.txt -c -t. -r/n' 导出: --导出全表数据out EXEC master..xp_cmdshell 'bcp pruduct out d:/wsp.txt -c -Usa -Psa' --导出查询结果queryout EXEC master..xp_cmdshell 'bcp "select * from pruduct where part_id like ''80%''" queryout d:/wsp.txt -c -t, -Usa -Psa' --导入文本文档: BULK INSERT os FROM 'c:/d.txt' WITH ( FIELDTERMINATOR = ',', --列以逗号隔开 ROWTERMINATOR = '/n' --行以换行符隔开 ) ---osql,执行sql命令 exec master..xp_cmdshell 'osql -U sa -P sa -i d:/tt.txt' --用SQL语句备份、还原数据库 BACKUP DATABASE test --这里的test指的是数据库名称 TO disk = 'c:/backup.bak' --这里指名的数据库路径(backup.bak为备份文件名) WITH FORMAT, NAME = 'Full Backup of MyNwind' --这个是备注,无所谓。。随便写。 RESTORE DATABASE jz1 --所被恢复的数据库名称 FROM disk = 'c:/backup.bak --本地硬盘路径(backup.bak为备份文件名) GO --SQL语句分离、附加: --分离 sp_detach_db 'zetian' --附加 EXEC sp_attach_db @dbname = N'zetian', @filename1 = N'C:/Inetpub/wwwroot/zetian/数据库/zetian.mdf', @filename2 = N'C:/Inetpub/wwwroot/zetian/数据库/zetian_log.ldf' --分解字咐 declare @a table(A varchar(20), B varchar(20), C varchar(20), D varchar(20)) insert @a select 'a1' ,'b1', 'c1', 'd1/da' union all select 'a2' ,'b2' ,'c2' ,'d22/da/da22' union all select 'a3' ,'b3' ,'c3' ,'d3' declare @t table( id int identity(1,1),e int) insert @t select top 500 1 from syscolumns select a,b,c,substring(d+'/',id,charindex('/',d+'/',id+1)-id) X from @a a,@t b where substring('/'+d,id,1)='/' --设置约束 CREATE TABLE jobs ( min_lvl int NOT NULL CHECK (min_lvl > = 10) ) 判断该文件是否存在: DECLARE @err INT,@fso INT,@fleExists BIT,@file VARCHAR(100) SET @file='d:/aaa.txt' EXEC @err=sp_OACreate 'Scripting.FileSystemObject',@fso OUTPUT EXEC @err=sp_OAMethod @fso, 'FileExists',@fleExists OUTPUT,@file EXEC @err = sp_OADestroy @fso IF @fleExists=0 PRINT '"' + @file + '" not exists' ELSE exec('exec xp_cmdshell ''del '+@file+'''') --存在则删除 设置级联: alter table 表名 constraint FK_employee foreign key (外键字段) references 主表(主键字段)ON UPDATE CASCADE 设置默认值: alter table 表名 constraint FK_employee default 默认值 for 字段
--数据库加密解密 ----加密存储过程: Create PROCEDURE po WITH ENCRYPTION AS Select * FROM ta GO --查看加密信息 exec sp_helptext po ---创建解密存储过程 create PROCEDURE sp_decrypt(@objectname varchar(50)) AS begin set nocount on --CSDN:j9988 copyright:2004.07.15 --V3.2 --破解字节不受限制,适用于SQLSERVER2000存储过程,函数,视图,触发器 --修正上一版"视图触发器"不能正确解密错误 --发现有错,请E_MAIL:CSDNj9988@tom.com begin tran declare @objectname1 varchar(100),@orgvarbin varbinary(8000) declare @sql1 nvarchar(4000),@sql2 varchar(8000),@sql3 nvarchar(4000),@sql4 nvarchar(4000) DECLARE @OrigSpText1 nvarchar(4000), @OrigSpText2 nvarchar(4000) , @OrigSpText3 nvarchar(4000), @resultsp nvarchar(4000) declare @i int,@status int,@type varchar(10),@parentid int declare @colid int,@n int,@q int,@j int,@k int,@encrypted int,@number int select @type=xtype,@parentid=parent_obj from sysobjects where id=object_id(@objectname) create table #temp(number int,colid int,ctext varbinary(8000),encrypted int,status int) insert #temp Select number,colid,ctext,encrypted,status FROM syscomments Where id = object_id(@objectname) select @number=max(number) from #temp set @k=0 while @k<=@number begin if exists(select 1 from syscomments where id=object_id(@objectname) and number=@k) begin if @type='P' set @sql1=(case when @number>1 then 'Alter PROCEDURE '+ @objectname +';'+rtrim(@k)+' WITH ENCRYPTION AS ' else 'Alter PROCEDURE '+ @objectname+' WITH ENCRYPTION AS ' end) if @type='TR' begin declare @parent_obj varchar(255),@tr_parent_xtype varchar(10) select @parent_obj=parent_obj from sysobjects where id=object_id(@objectname) select @tr_parent_xtype=xtype from sysobjects where id=@parent_obj if @tr_parent_xtype='V' begin set @sql1='Alter TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION INSTERD OF Insert AS PRINT 1 ' end else begin set @sql1='Alter TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION FOR Insert AS PRINT 1 ' end end if @type='FN' or @type='TF' or @type='IF' set @sql1=(case @type when 'TF' then 'Alter FUNCTION '+ @objectname+'(@a char(1)) returns @b table(a varchar(10)) with encryption as begin insert @b select @a return end ' when 'FN' then 'Alter FUNCTION '+ @objectname+'(@a char(1)) returns char(1) with encryption as begin return @a end' when 'IF' then 'Alter FUNCTION '+ @objectname+'(@a char(1)) returns table with encryption as return select @a as a' end) if @type='V' set @sql1='Alter VIEW '+@objectname+' WITH ENCRYPTION AS Select 1 as f' set @q=len(@sql1) set @sql1=@sql1+REPLICATE('-',4000-@q) select @sql2=REPLICATE('-',8000) set @sql3='exec(@sql1' select @colid=max(colid) from #temp where number=@k set @n=1 while @n<=CEILING(1.0*(@colid-1)/2) and len(@sql3)<=3996 begin set @sql3=@sql3+'+@' set @n=@n+1 end set @sql3=@sql3+')' exec sp_executesql @sql3,N'@sql1 nvarchar(4000),@ varchar(8000)',@sql1=@sql1,@=@sql2 end set @k=@k+1 end set @k=0 while @k<=@number begin if exists(select 1 from syscomments where id=object_id(@objectname) and number=@k) begin select @colid=max(colid) from #temp where number=@k set @n=1 while @n<=@colid begin select @OrigSpText1=ctext,@encrypted=encrypted,@status=status FROM #temp Where colid=@n and number=@k SET @OrigSpText3=(Select ctext FROM syscomments Where id=object_id(@objectname) and colid=@n and number=@k) if @n=1 begin if @type='P' SET @OrigSpText2=(case when @number>1 then 'Create PROCEDURE '+ @objectname +';'+rtrim(@k)+' WITH ENCRYPTION AS ' else 'Create PROCEDURE '+ @objectname +' WITH ENCRYPTION AS ' end) if @type='FN' or @type='TF' or @type='IF' SET @OrigSpText2=(case @type when 'TF' then 'Create FUNCTION '+ @objectname+'(@a char(1)) returns @b table(a varchar(10)) with encryption as begin insert @b select @a return end ' when 'FN' then 'Create FUNCTION '+ @objectname+'(@a char(1)) returns char(1) with encryption as begin return @a end' when 'IF' then 'Create FUNCTION '+ @objectname+'(@a char(1)) returns table with encryption as return select @a as a' end) if @type='TR' begin if @tr_parent_xtype='V' begin set @OrigSpText2='Create TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION INSTEAD OF Insert AS PRINT 1 ' end else begin set @OrigSpText2='Create TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION FOR Insert AS PRINT 1 ' end end if @type='V' set @OrigSpText2='Create VIEW '+@objectname+' WITH ENCRYPTION AS Select 1 as f' set @q=4000-len(@OrigSpText2) set @OrigSpText2=@OrigSpText2+REPLICATE('-',@q) end else begin SET @OrigSpText2=REPLICATE('-', 4000) end SET @i=1 SET @resultsp = replicate(N'A', (datalength(@OrigSpText1) / 2)) WHILE @i<=datalength(@OrigSpText1)/2 BEGIN SET @resultsp = stuff(@resultsp, @i, 1, NCHAR(UNICODE(substring(@OrigSpText1, @i, 1)) ^ (UNICODE(substring(@OrigSpText2, @i, 1)) ^ UNICODE(substring(@OrigSpText3, @i, 1))))) SET @i=@i+1 END set @orgvarbin=cast(@OrigSpText1 as varbinary(8000)) set @resultsp=(case when @encrypted=1 then @resultsp else convert(nvarchar(4000),case when @status&2=2 then uncompress(@orgvarbin) else @orgvarbin end) end) print @resultsp set @n=@n+1 end end set @k=@k+1 end drop table #temp rollback tran end --调用解密存储过程将加密的存储过程进行解密 exec sp_decrypt po --SQL处理库存与销售,先进先出原则 --库存表 create table t( id int identity(1,1), name varchar(50),--商品名称 j int, --入库数量 c int, --出库数量 jdate datetime --入库时间 ) insert into t(name,j,c,jdate) select 'A',100,0,'2007-12-01' insert into t(name,j,c,jdate) select 'A',200,0,'2008-01-07' insert into t(name,j,c,jdate) select 'B',320,0,'2007-12-21' insert into t(name,j,c,jdate) select 'A',100,0,'2008-01-15' insert into t(name,j,c,jdate) select 'B',90,0,'2008-02-03' insert into t(name,j,c,jdate) select 'A',460,0,'2008-02-01' insert into t(name,j,c,jdate) select 'A',510,0,'2008-03-01' go create proc wsp @name varchar(50), @cost int--,--销售量 --@returns int output --该货物的库存是否够(不够:-1;够:1) as --先得出该货物的库存是否够 declare @spare float --剩余库存 select @spare=sum(j)-sum(c) from t where name=@name if(@spare>=@cost) begin --根据入库日期采用先进先出原则对货物的库存进行处理 update t set c= case when (select @cost-isnull(sum(j),0)+isnull(sum(c),0) from t where name=@name and jdate<=a.jdate and j!=c)>=0 then a.j else case when (select @cost-isnull(sum(j),0)+isnull(sum(c),0) from t where name=@name and jdate<a.jdate and j!=c)<0 then 0 else (select @cost-isnull(sum(j),0)+isnull(sum(c),0)+a.c from t where name=@name and jdate<a.jdate and j!=c) end end from t a where name=@name and j!=c end else raiserror('库存不足',16,1) return go --测试: exec wsp @name='A',@cost=390 select * from t --删除测试环境 drop table t drop proc wsp 1、说明:复制表(只复制结构,源表名:a 新表名:b) (Access可用) 法一:select * into b from a where 1 <>1 法二:select top 0 * into b from a 2、说明:拷贝表(拷贝数据,源表名:a 目标表名:b) (Access可用) insert into b(a, b, c) select d,e,f from b; 3、说明:跨数据库之间表的拷贝(具体数据使用绝对路径) (Access可用) insert into b(a, b, c) select d,e,f from b in ‘具体数据库’ where 条件 例子:..from b in '"&Server.MapPath(".")&"/data.mdb" &"' where.. 4、说明:子查询(表名1:a 表名2:b) select a,b,c from a where a IN (select d from b ) 或者: select a,b,c from a where a IN (1,2,3) 5、说明:显示文章、提交人和最后回复时间 select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b 6、说明:外连接查询(表名1:a 表名2:b) select a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON a.a = b.c 7、说明:在线视图查询(表名1:a ) select * from (SELECT a,b,c FROM a) T where t.a > 1; 8、说明:between的用法,between限制查询数据范围时包括了边界值,not between不包括 select * from table1 where time between time1 and time2 select a,b,c, from table1 where a not between 数值1 and 数值2 9、说明:in 的使用方法 select * from table1 where a [not] in (‘值1’,’值2’,’值4’,’值6’) 10、说明:两张关联表,删除主表中已经在副表中没有的信息 delete from table1 where not exists ( select * from table2 where table1.field1=table2.field1 ) 11、说明:四表联查问题: select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where ..... 12、说明:日程安排提前五分钟提醒 SQL: select * from 日程安排 where datediff('minute',f开始时间,getdate())>5 13、说明:一条sql 语句搞定数据库分页 select top 10 b.* from (select top 20 主键字段,排序字段 from 表名 order by 排序字段 desc) a,表名 b where b.主键字段 = a.主键字段 order by a.排序字段 14、说明:前10条记录 select top 10 * form table1 where 范围 15、说明:选择在每一组b值相同的数据中对应的a最大的记录的所有信息(类似这样的用法可以用于论坛每月排行榜,每月热销产品分析,按科目成绩排名,等等.) select a,b,c from tablename ta where a=(select max(a) from tablename tb where tb.b=ta.b) 16、说明:包括所有在 TableA 中但不在 TableB和TableC 中的行并消除所有重复行而派生出一个结果表 (select a from tableA ) except (select a from tableB) except (select a from tableC) 17、说明:随机取出10条数据 select top 10 * from tablename order by newid() 18、说明:随机选择记录 select newid() 19、说明:删除重复记录 Delete from tablename where id not in (select max(id) from tablename group by col1,col2,...) 20、说明:列出数据库里所有的表名 select name from sysobjects where type='U' 21、说明:列出表里的所有的 select name from syscolumns where id=object_id('TableName') 22、说明:列示type、vender、pcs字段,以type字段排列,case可以方便地实现多重选择,类似select 中的case。 select type,sum(case vender when 'A' then pcs else 0 end),sum(case vender when 'C' then pcs else 0 end),sum(case vender when 'B' then pcs else 0 end) FROM tablename group by type 显示结果: type vender pcs 电脑 A 1 电脑 A 1 光盘 B 2 光盘 A 2 手机 B 3 手机 C 3 23、说明:初始化表table1 TRUNCATE TABLE table1 24、说明:选择从10到15的记录 select top 5 * from (select top 15 * from table order by id asc) table_别名 order by id desc向数据库中上传图片 protected void Button2_Click(object sender, EventArgs e) { string lastName = FileUpload1.FileName.Substring(FileUpload1.FileName.LastIndexOf(".") + 1); if (lastName.ToLower() == "jpg" || lastName.ToLower() == "bmp" || lastName.ToLower() == "gif") { int len = FileUpload1.PostedFile.ContentLength; Byte[] pictureData = new byte[len]; //将图片转换成二进制 HttpPostedFile htp = FileUpload1.PostedFile; Stream srm = htp.InputStream; srm.Read(pictureData, 0, len); SqlConnection conn = new SqlConnection("Data Source=tiger;Initial Catalog=liuyan;Integrated Security=True"); conn.Open(); string sqlsel = "select * from tb_pic"; SqlDataAdapter ada = new SqlDataAdapter(sqlsel, conn); DataSet ds = new DataSet(); ada.Fill(ds); DataList1.DataSource = ds; DataList1.DataBind(); SqlCommand comd = new SqlCommand("insert into tb_pic (username,name,pic) values ('" + TextBox4.Text + "','" + FileUpload1.FileName + "',@pictureData)", conn); comd.Parameters.Add("@pictureData", SqlDbType.Image); comd.Parameters["@pictureData"].Value = pictureData; comd.ExecuteNonQuery(); DataList1.DataBind(); conn.Close(); Response.Write(" <script>alert('添加成功!')location='tupian.aspx' </script>"); } }
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