存储过程中如何按变量值建表(create table) 存储过程中如何按变量值建表(create table) 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 --用动态SQL。declare @sql varchar(8000),@tbName varchar(100)set @tbName = 'ttt'set @sql = 'create table ' + @tbName + ' (id int)'exec (@sql) 动态sql语句基本语法 1 :普通SQL语句可以用Exec执行 eg: Select * from tableName Exec('select * from tableName') Exec sp_executesql N'select * from tableName' -- 请注意字符串前一定要加N 2:字段名,表名,数据库名之类作为变量时,必须用动态SQL eg: declare @fname varchar(20) set @fname = 'FiledName' Select @fname from tableName -- 错误,不会提示错误,但结果为固定值FiledName,并非所要。 Exec('select ' + @fname + ' from tableName') -- 请注意 加号前后的 单引号的边上加空格 当然将字符串改成变量的形式也可 declare @fname varchar(20) set @fname = 'FiledName' --设置字段名 declare @s varchar(1000) set @s = 'select ' + @fname + ' from tableName' Exec(@s) -- 成功 exec sp_executesql @s -- 此句会报错 declare @s Nvarchar(1000) -- 注意此处改为nvarchar(1000) set @s = 'select ' + @fname + ' from tableName' Exec(@s) -- 成功 exec sp_executesql @s -- 此句正确 3. 输出参数 declare @num int, @sql nvarchar(4000) set @sql='select count(*) from tableName' exec(@sql) --如何将exec执行结果放入变量中? declare @num int, @sql nvarchar(4000) set @sql='select @a=count(*) from tableName ' exec sp_executesql @sql,N'@a int output',@num output select @num CREATE TABLE [dbo].[DF_SYSTEMDATA] ( [项目] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL , [值] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL , [值类型] [varchar] (1) COLLATE Chinese_PRC_CI_AS NULL ) ON [PRIMARY]GOINSERT INTO DF_SYSTEMDATA(项目,值) VALUES('最新年份','2008')INSERT INTO DF_SYSTEMDATA(项目,值) VALUES('最新月份','1')goDECLARE @l_year char(15),@l_sql nvarchar(1000)select @l_year='CW_YSDF'+值 from df_systemdata where 项目='最新年份'set @l_sql='select * from dbo.sysobjects where name='+@l_year+' and type=''U''CREATE TABLE '+@l_year+' ([dfid] [varchar] (10) COLLATE Chinese_PRC_CI_AS NOT NULL , [上月余额] [money] NULL , [本月电费] [money] NULL , [本月应收] [money] NULL , [本月未收] [money] NULL , [月份] [int] NOT NULL ) ON [PRIMARY]'print @l_sqlwhere name='+@l_year+' 变量在这有问题请老师告诉怎么用,谢谢! 上面写错了CREATE TABLE [dbo].[DF_SYSTEMDATA] ( [项目] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL , [值] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL , [值类型] [varchar] (1) COLLATE Chinese_PRC_CI_AS NULL ) ON [PRIMARY] GO INSERT INTO DF_SYSTEMDATA(项目,值) VALUES('最新年份','2008') INSERT INTO DF_SYSTEMDATA(项目,值) VALUES('最新月份','1') go DECLARE @l_year char(15),@l_sql nvarchar(1000)select @l_year='CW_YSDF'+值 from df_systemdata where 项目='最新年份'set @l_sql='if exists(select * from dbo.sysobjects where name='+@l_year+' and type=''U'')CREATE TABLE '+@l_year+' ([dfid] [varchar] (10) COLLATE Chinese_PRC_CI_AS NOT NULL , [上月余额] [money] NULL , [本月电费] [money] NULL , [本月应收] [money] NULL , [本月未收] [money] NULL , [月份] [int] NOT NULL ) ON [PRIMARY]'--set @l_sql1='select * from dbo.sysobjects where name='+@l_year+' and type=''U'''--if not exists --exec @l_sql1--print @l_yearprint @l_sqlwhere name='+@l_year+' 变量在这有问题 请老师告诉怎么用,谢谢! 应该是if not exists() set @l_sql='if not exists(select * from dbo.sysobjects where name='''+@l_year+''' and type=''U'')CREATE TABLE '+@l_year+' ([dfid] [varchar] (10) COLLATE Chinese_PRC_CI_AS NOT NULL , [上月余额] [money] NULL , [本月电费] [money] NULL , [本月应收] [money] NULL , [本月未收] [money] NULL , [月份] [int] NOT NULL ) ON [PRIMARY]'这样试试,你的没加引号在@l_year 两边 新手求助,关于SQL的自动生成值得问题? 两表join的问题,急,下线等。。。 求一表设计~不知道算不算简单~反正高手都来看看吧 竖转横的问题 三表联合查询更新为何不行呢? sql 问题~! 从oracel到Sql Server的转换?? 小小的问题-- 建立数据原 两个表的合并问题 【新手请教】认知无线店中并行频谱分配算法代码 定义临时表一定要定义其结构吗? 求一SQL语句!
declare @sql varchar(8000),@tbName varchar(100)set @tbName = 'ttt'set @sql = 'create table ' + @tbName + ' (id int)'exec (@sql)
动态sql语句基本语法
1 :普通SQL语句可以用Exec执行 eg: Select * from tableName
Exec('select * from tableName')
Exec sp_executesql N'select * from tableName' -- 请注意字符串前一定要加N 2:字段名,表名,数据库名之类作为变量时,必须用动态SQL eg:
declare @fname varchar(20)
set @fname = 'FiledName'
Select @fname from tableName -- 错误,不会提示错误,但结果为固定值FiledName,并非所要。
Exec('select ' + @fname + ' from tableName') -- 请注意 加号前后的 单引号的边上加空格 当然将字符串改成变量的形式也可
declare @fname varchar(20)
set @fname = 'FiledName' --设置字段名 declare @s varchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- 成功
exec sp_executesql @s -- 此句会报错 declare @s Nvarchar(1000) -- 注意此处改为nvarchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- 成功
exec sp_executesql @s -- 此句正确 3. 输出参数
declare @num int, @sql nvarchar(4000)
set @sql='select count(*) from tableName'
exec(@sql)
--如何将exec执行结果放入变量中? declare @num int, @sql nvarchar(4000)
set @sql='select @a=count(*) from tableName '
exec sp_executesql @sql,N'@a int output',@num output
select @num
CREATE TABLE [dbo].[DF_SYSTEMDATA] (
[项目] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
[值] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
[值类型] [varchar] (1) COLLATE Chinese_PRC_CI_AS NULL
) ON [PRIMARY]
GOINSERT INTO DF_SYSTEMDATA(项目,值) VALUES('最新年份','2008')
INSERT INTO DF_SYSTEMDATA(项目,值) VALUES('最新月份','1')
goDECLARE @l_year char(15),@l_sql nvarchar(1000)
select @l_year='CW_YSDF'+值 from df_systemdata where 项目='最新年份'
set @l_sql='select * from dbo.sysobjects where name='+@l_year+' and type=''U''
CREATE TABLE '+@l_year+' ([dfid] [varchar] (10) COLLATE Chinese_PRC_CI_AS NOT NULL ,
[上月余额] [money] NULL ,
[本月电费] [money] NULL ,
[本月应收] [money] NULL ,
[本月未收] [money] NULL ,
[月份] [int] NOT NULL
) ON [PRIMARY]'print @l_sqlwhere name='+@l_year+' 变量在这有问题请老师告诉怎么用,谢谢!
上面写错了CREATE TABLE [dbo].[DF_SYSTEMDATA] (
[项目] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
[值] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
[值类型] [varchar] (1) COLLATE Chinese_PRC_CI_AS NULL
) ON [PRIMARY]
GO
INSERT INTO DF_SYSTEMDATA(项目,值) VALUES('最新年份','2008')
INSERT INTO DF_SYSTEMDATA(项目,值) VALUES('最新月份','1')
go
DECLARE @l_year char(15),@l_sql nvarchar(1000)
select @l_year='CW_YSDF'+值 from df_systemdata where 项目='最新年份'
set @l_sql='if exists(select * from dbo.sysobjects where name='+@l_year+' and type=''U'')
CREATE TABLE '+@l_year+' ([dfid] [varchar] (10) COLLATE Chinese_PRC_CI_AS NOT NULL ,
[上月余额] [money] NULL ,
[本月电费] [money] NULL ,
[本月应收] [money] NULL ,
[本月未收] [money] NULL ,
[月份] [int] NOT NULL
) ON [PRIMARY]'
--set @l_sql1='select * from dbo.sysobjects where name='+@l_year+' and type=''U'''
--if not exists
--exec @l_sql1
--print @l_year
print @l_sqlwhere name='+@l_year+' 变量在这有问题
请老师告诉怎么用,谢谢!
if not exists()
set @l_sql='if not exists(select * from dbo.sysobjects where name='''+@l_year+''' and type=''U'')
CREATE TABLE '+@l_year+' ([dfid] [varchar] (10) COLLATE Chinese_PRC_CI_AS NOT NULL ,
[上月余额] [money] NULL ,
[本月电费] [money] NULL ,
[本月应收] [money] NULL ,
[本月未收] [money] NULL ,
[月份] [int] NOT NULL
) ON [PRIMARY]'
这样试试,你的没加引号在@l_year 两边