MSSQL将表中的数据导出为SQL语句

最新推荐文章于 2023-02-07 10:37:32 发布

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最新推荐文章于 2023-02-07 10:37:32 发布

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本文介绍了一种使用T-SQL创建动态存储过程的方法，该存储过程可以根据传入的表名自动生成插入语句，并提供了调用示例。通过案例分支处理不同数据类型，确保了插入数据的正确性和兼容性。

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一、存储过程

--查询对应的数据类型xtype=127是bigint类型
select * from systypes  

--判断是否存在
IF EXISTS(SELECT * FROM sysobjects WHERE NAME='proc_insert')
--删除存储过程
drop proc proc_insert  
go  
--创建存储过程
create proc proc_insert (@tablename varchar(256))  
as  
begin  
set nocount on  --设置开启影响的行数
--声明变量
declare @sqlstr varchar(4000)  
declare @sqlstr1 varchar(4000)  
declare @sqlstr2 varchar(4000)  
select @sqlstr='select ''insert into '+@tablename  
select @sqlstr1=''  
select @sqlstr2=' ('  
select @sqlstr1= ' values ( ''+'  
select @sqlstr1=@sqlstr1+col+'+'',''+' ,@sqlstr2=@sqlstr2+name +','
--case分支语句 
from (select case   
-- when a.xtype =173 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar('+convert(varchar(4),a.length*2+2)+'),'+a.name +')'+' end'  
when a.xtype =127 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(20),'+a.name +')'+' end'  
when a.xtype =104 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(1),'+a.name +')'+' end'  
when a.xtype =175 then 'case when '+a.name+' is null then ''NULL'' else '+'''''''''+'+'replace('+a.name+','''''''','''''''''''')' + '+'''''''''+' end'  
when a.xtype =61 then 'case when '+a.name+' is null then ''NULL'' else '+'''''''''+'+'convert(varchar(23),'+a.name +',121)'+ '+'''''''''+' end'  
when a.xtype =106 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar('+convert(varchar(4),a.xprec+2)+'),'+a.name +')'+' end'  
when a.xtype =62 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(23),'+a.name +',2)'+' end'  
when a.xtype =56 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(11),'+a.name +')'+' end'  
when a.xtype =60 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(22),'+a.name +')'+' end'  
when a.xtype =239 then 'case when '+a.name+' is null then ''NULL'' else '+'''''''''+'+'replace('+a.name+','''''''','''''''''''')' + '+'''''''''+' end'  
when a.xtype =108 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar('+convert(varchar(4),a.xprec+2)+'),'+a.name +')'+' end'  
when a.xtype =231 then 'case when '+a.name+' is null then ''NULL'' else '+'''''''''+'+'replace('+a.name+','''''''','''''''''''')' + '+'''''''''+' end'  
when a.xtype =59 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(23),'+a.name +',2)'+' end'  
when a.xtype =58 then 'case when '+a.name+' is null then ''NULL'' else '+'''''''''+'+'convert(varchar(23),'+a.name +',121)'+ '+'''''''''+' end'  
when a.xtype =52 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(12),'+a.name +')'+' end'  
when a.xtype =122 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(22),'+a.name +')'+' end'  
when a.xtype =48 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(6),'+a.name +')'+' end'  
-- when a.xtype =165 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar('+convert(varchar(4),a.length*2+2)+'),'+a.name +')'+' end'  
when a.xtype =167 then 'case when '+a.name+' is null then ''NULL'' else '+'''''''''+'+'replace('+a.name+','''''''','''''''''''')' + '+'''''''''+' end'  
else '''NULL'''  --其他
end as col,a.colid,a.name  
from syscolumns a where a.id = object_id(@tablename) and a.xtype <>189 and a.xtype <>34 and a.xtype <>35 and a.xtype <>36  
)t order by colid  
  
select @sqlstr=@sqlstr+left(@sqlstr2,len(@sqlstr2)-1)+') '+left(@sqlstr1,len(@sqlstr1)-3)+');'' from '+@tablename  
--print @sqlstr  
exec( @sqlstr)  --执行sql语句
set nocount off  --设置关闭影响的行数
end  
go

二、调用存储过程

exec proc_insert sellrecord