SQL Server带列名导出到Excel(Export to CSV with headers)的几个思路

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今天在项目中遇到一个问题，需要从SQL Server导出表到Excel，但需要带列名。尝试了几种方法，并小结如下：

假定表如下：

USE testDb2
GO


IF NOT OBJECT_ID('Demo_A') IS NULL
DROP TABLE [Demo_A]

/****** Object: Table [dbo].[Demo_A] downmoon:[e-mail] ******/


CREATE TABLE [dbo].[Demo_A](
[ID] int not null,
[Name] [Nvarchar](20) NOT NULL
)

GO
INSERT [dbo].[Demo_A]
SELECT 1,'郭靖'
union ALL SELECT 2,'胡一刀'
union ALL SELECT 3,'令狐冲'
GO

如果通常的思路，我们可以用BCP，命令如下：

-- To allow advanced options to be changed.
EXEC sp_configure 'show advanced options', 1
GO
-- To update the currently configured value for advanced options.
RECONFIGURE
GO
-- To enable the feature.
EXEC sp_configure 'xp_cmdshell', 1
GO
-- To update the currently configured value for this feature.
RECONFIGURE
GO

EXEC master..xp_cmdshell 'bcp Testdb2.dbo.Demo_A out c:\Temp.xls -c -q -S"ap4\Net2012" -U"sa" -P"sA"' 

这样得到的xls文件中，Sheet是不带列名的。但可以改进一下，得到如下命令(参考：http://social.msdn.microsoft.com/forums/en-US/sqlgetstarted/thread/812b8eec-5b77-42a2-bd23-965558ece5b9/)：

方法一：使用BCP

为了方便，我创建了一个存储过程：

/****** SQL Export to xls ***************/
/* Example */
/*CPP_Export_To_Excel_With_Header 'Testdb2','Demo_A','C:\TestExxelWithHeader.xls'*/
/* 2012.5.4 BY tony,邀月, [e-mail] */
---- CPP_Export_To_Excel_With_Header 'Testdb2','Demo_A','C:\TestExcelWithHeader.xls'

Create Procedure CPP_Export_To_Excel_With_Header
(
@db_name varchar(255),
@table_name varchar(255),
@file_path varchar(255)
)
as

----Generate column names as a recordset
declare @columns varchar(8000), @sql varchar(8000)
declare @HeadersOnlyFile varchar(255),@TableDataWithoutHeaders varchar(255)
set @HeadersOnlyFile=replace(cast(newid() as VARCHAR(40)),'-','')+'1.xls'

set @TableDataWithoutHeaders=replace(cast(newid() as VARCHAR(40)),'-','')+'2.xls'
select
@columns=coalesce(@columns+',','')+column_name+' as '+column_name
from
information_schema.columns
where
table_name=@table_name
select @columns=''''''+replace(replace(@columns,' as ',''''' as '),',',',''''')
print @columns
----Generate column names file
set @sql='exec master..xp_cmdshell ''bcp " select * from (select '+@columns+') as t" queryout "'+@HeadersOnlyFile+'" -c'''
print @sql
exec(@sql)

----Create a dummy file to have actual data
set @sql='exec master..xp_cmdshell ''bcp "'+@db_name+'.dbo.'+@table_name+'" out "'+@TableDataWithoutHeaders+'" -c -t -T'''
print @sql
exec(@sql)

--Merge File into One Final Format
set @sql='exec master..xp_cmdshell ''copy /b '+@HeadersOnlyFile+'+'+@TableDataWithoutHeaders+' '+@file_path+''''
print @sql
exec(@sql)

--Delete temp File
set @sql='exec master..xp_cmdshell ''del '+@HeadersOnlyFile+''''
exec(@sql)
set @sql='exec master..xp_cmdshell ''del '+@TableDataWithoutHeaders+''''
exec(@sql)

调用方法：

CPP_Export_To_Excel_With_Header 'Testdb2','Demo_A','C:\TestExcelWithHeader.xls'

另外有类似的处理方法：(看这里：http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=49926),其主要思路如下：

方法二：

create procedure proc_generate_excel_with_columns
(
	@db_name	varchar(100),
	@table_name	varchar(100),	
	@file_name	varchar(100)
)
as

--Generate column names as a recordset
declare @columns varchar(8000), @sql varchar(8000), @data_file varchar(100)
select 
	@columns=coalesce(@columns+',','')+column_name+' as '+column_name 
from 
	information_schema.columns
where 
	table_name=@table_name
select @columns=''''''+replace(replace(@columns,' as ',''''' as '),',',',''''')

--Create a dummy file to have actual data
select @data_file=substring(@file_name,1,len(@file_name)-charindex('\',reverse(@file_name)))+'\data_file.xls'

--Generate column names in the passed EXCEL file
set @sql='exec master..xp_cmdshell ''bcp " select * from (select '+@columns+') as t" queryout "'+@file_name+'" -c'''
exec(@sql)

--Generate data in the dummy file
set @sql='exec master..xp_cmdshell ''bcp "select * from '+@db_name+'..'+@table_name+'" queryout "'+@data_file+'" -c'''
exec(@sql)

--Copy dummy file to passed EXCEL file
set @sql= 'exec master..xp_cmdshell ''type '+@data_file+' >> "'+@file_name+'"'''
exec(@sql)

--Delete dummy file 
set @sql= 'exec master..xp_cmdshell ''del '+@data_file+''''
exec(@sql)

调用示例：

EXEC proc_generate_excel_with_columns 'your dbname', 'your table name','your file path'

如果，你的环境是SQL Server 2005,那么可以有：

方法三，使用sp_makewebtask,仅适用于SQL Server 2005

0)表T1结构
a    int
b    int
x    char

1)开启Web Assistant Procedures

exec sp_configure 'show advanced options', 1 
RECONFIGURE 
exec sp_configure 'Web Assistant Procedures', 1 
RECONFIGURE 

2)执行如下语句

EXEC sp_makewebtask 
    @outputfile = 'd:\testing.xls', 
    @query = 'Select TOP 10 * from shenliang1985..T1', 
    @colheaders =1, 
    @FixedFont=0,@lastupdated=0,@resultstitle='Querying details'

3)查看生成的EXCEl的

Querying details                            

                            

Last updated: 2010-03-03 01:02:59.263                            

a    b    x                    
0    0    0                    
2    5    1                    
4    10    2                    
6    15    3                    
8    20    4                    
10    25    5                    
12    30    6                    
14    35    7                    
16    40    8                    
18    45    9    

可惜SQL Server 2008以后sp_makewebtask 这个存储过程取消了，后续版本也不再启用。

方法一和方法二其实生成的文件都不上真正的Excel文件，虽然后缀名为xls，为此，找到邹建写的一个存储过程。

方法四,使用OpenRowSet：

/*--数据导出EXCEL

导出查询中的数据到Excel,包含字段名,文件为真正的Excel文件
如果文件不存在,将自动创建文件
如果表不存在,将自动创建表
基于通用性考虑,仅支持导出标准数据类型

--邹建 2003.10(引用请保留此信息)--*/

/*--调用示例

p_exporttb @sqlstr='select * from 地区资料'
,@path='c:\',@fname='aa.xls',@sheetname='地区资料'
--*/
create proc p_exporttb
@sqlstr varchar(8000),--查询语句,如果查询语句中使用了order by ,请加上top 100 percent
@path nvarchar(1000),--文件存放目录
@fname nvarchar(250),--文件名
@sheetname varchar(250)=''--要创建的工作表名,默认为文件名
as
declare @err int,@src nvarchar(255),@desc nvarchar(255),@out int
declare @obj int,@constr nvarchar(1000),@sql varchar(8000),@fdlist varchar(8000)

--参数检测
if isnull(@fname,'')=''set @fname='temp2012.xls'
if isnull(@sheetname,'')='' set @sheetname=replace(@fname,'.','#')

--检查文件是否已经存在
if right(@path,1)<>'\' set @path=@path+'\'
create table #tb(a bit,b bit,c bit)
set @sql=@path+@fname
insert into #tb exec master..xp_fileexist @sql

--数据库创建语句
set @sql=@path+@fname
if exists(select 1 from #tb where a=1)
set @constr='DRIVER={Microsoft Excel Driver (*.xls)};DSN='''';READONLY=FALSE'
+';CREATE_DB="'+@sql+'";DBQ='+@sql
else
set @constr='Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties="Excel 8.0;HDR=YES'
+';DATABASE='+@sql+'"'

--连接数据库
exec @err=sp_oacreate 'adodb.connection',@obj out
if @err<>0 goto lberr

exec @err=sp_oamethod @obj,'open',null,@constr
if @err<>0 goto lberr

--创建表的SQL
declare @tbname sysname
set @tbname='##tmp_'+convert(varchar(38),newid())
set @sql='select * into ['+@tbname+'] from('+@sqlstr+') a'
exec(@sql)

select @sql='',@fdlist=''
select @fdlist=@fdlist+',['+a.name+']'
,@sql=@sql+',['+a.name+'] '
+case
when b.name like '%char'
then case when a.length>255 then 'memo'
else 'text('+cast(a.length as varchar)+')' end
when b.name like '%int' or b.name='bit' then 'int'
when b.name like '%datetime' then 'datetime'
when b.name like '%money' then 'money'
when b.name like '%text' then 'memo'
else b.name end
FROM tempdb..syscolumns a left join tempdb..systypes b on a.xtype=b.xusertype
where b.name not in('image','uniqueidentifier','sql_variant','varbinary','binary','timestamp')
and a.id=(select id from tempdb..sysobjects where name=@tbname)

if @@rowcount=0 return

select @sql='create table ['+@sheetname
+']('+substring(@sql,2,8000)+')'
,@fdlist=substring(@fdlist,2,8000)

exec @err=sp_oamethod @obj,'execute',@out out,@sql
if @err<>0 goto lberr

exec @err=sp_oadestroy @obj

--导入数据
set @sql='openrowset(''MICROSOFT.JET.OLEDB.4.0'',''Excel 8.0;HDR=YES
;DATABASE='+@path+@fname+''',['+@sheetname+'$])'

exec('insert into '+@sql+'('+@fdlist+') select '+@fdlist+' from ['+@tbname+']')

set @sql='drop table ['+@tbname+']'
exec(@sql)
return

lberr:
exec sp_oageterrorinfo 0,@src out,@desc out
lbexit:
select cast(@err as varbinary(4)) as 错误号
,@src as 错误源,@desc as 错误描述
select @sql,@constr,@fdlist
go

为了执行这个存储过程，你得先打开以下开关：

-- To allow advanced options to be changed.
EXEC sp_configure 'show advanced options', 1
GO
-- To allow advanced options to be changed.
EXEC sp_configure 'Ole Automation Procedures', 1
GO

EXEC sp_configure 'Ad Hoc Distributed Queries', 1
GO

-- To update the currently configured value for advanced options.
RECONFIGURE
GO

调用示例：

p_exporttb @sqlstr='select * from [Demo_A]'
,@path='c:\',@fname='Export2xls_ByProc.xls',@sheetname='员工名称'

结果确实是正宗的xls文件。

如果你是兼写程序的DBA，那么NPOI是你理想的选择，因为它是纯原生的不依赖于Office组件的开源第三方组件，它提供了一个“CreateExportDataTableSheetAndHeaderRow”方法可以让你方便的生成纯正的Excel，遗憾的是，目前好像只支持到Excel 2003。示例请看这儿（http://scottonwriting.net/sowblog/archive/2011/06/08/export-an-ado-net-datatable-to-excel-using-npoi.aspx）,该组件的源码：http://npoi.codeplex.com/

方法五：

protected Sheet CreateExportDataTableSheetAndHeaderRow(DataTable exportData, string sheetName, CellStyle headerRowStyle)
{
    var sheet = this.Workbook.CreateSheet(EscapeSheetName(sheetName));

    // Create the header row
    var row = sheet.CreateRow(0);

    for (var colIndex = 0; colIndex < exportData.Columns.Count; colIndex++)
    {
        var cell = row.CreateCell(colIndex);
        cell.SetCellValue(exportData.Columns[colIndex].ColumnName);

        if (headerRowStyle != null)
            cell.CellStyle = headerRowStyle;
    }

    return sheet;
}

当然，如果你觉得以上方法门槛有点高，那么SSIS可能是你的首选，它的优势在于简单直观，并且可以导出为Excel2007格式。

只要在导出时选择第一行包含列名，即可。

方法六，使用SSIS

因为有人觉得界面过于繁琐，于是仿照导出向导的思路写了一个批处理，你可以修改为自己适合的内容：

方法七：(http://social.msdn.microsoft.com/forums/en-US/sqlgetstarted/thread/812b8eec-5b77-42a2-bd23-965558ece5b9/)

@ECHO OFF
REM -------------------------------------------------------------------------------
REM Generic script for exporting data to file from SQL Server using a SQL query.
REM The resulting file will be tab separated with newline as the row delimiter.
REM A log file is generated and kept in case of an error or when in debug mode.
REM See command syntax for details.
REM
REM History:
REM 20120327 Lars Rönnbäck CREATED
REM -------------------------------------------------------------------------------
:constants
SET myCodePage=ACP
:variables
SET theQuery=%~1
SET theFile=%~2
SET theServer=%~3
SET theDebug=%~4
SET /a aRandomNumber=%random%%%1000
FOR /F "usebackq tokens=1-7* delims=.:/,- " %%a IN (`ECHO %DATE%_%TIME%`) DO (SET myStartTime=%%a%%b%%c%%d%%e%%f%%g)
SET myColumnQuery="select top 0 * into [#columns_%myStartTime%_%aRandomNumber%] from (%theQuery%) q; select stuff((select char(9) + c.name from tempdb.sys.columns c where c.object_id = t.object_id order by c.column_id for XML path(''), type).value('.', 'varchar(max)'), 1,1,'') AS Header from tempdb.sys.tables t where t.name like '#columns_%myStartTime%_%aRandomNumber%%%'"
SET myHeaderFile=%theFile%.%aRandomNumber%.header
SET myDataFile=%theFile%.%aRandomNumber%.data
SET myLogFile=%theFile%.%myStartTime%_%aRandomNumber%.log
:checks
IF "%theQuery%"=="" (
GOTO syntax
)
IF "%theFile%"=="" (
GOTO syntax
)
IF "%theServer%"=="" (
SET theServer=%COMPUTERNAME%
)
:information
ECHO Start Time: %myStartTime% >> "%myLogFile%" 2>&1
ECHO Random Number: %aRandomNumber% >> "%myLogFile%" 2>&1
ECHO File: %theFile% >> "%myLogFile%" 2>&1
ECHO Server Name: %theServer% >> "%myLogFile%" 2>&1
ECHO Query: >> "%myLogFile%" 2>&1
ECHO. >> "%myLogFile%" 2>&1
ECHO %theQuery% >> "%myLogFile%" 2>&1
:export
BCP %myColumnQuery% queryout "%myHeaderFile%" -T -S "%theServer%" -a 65535 -c -C %myCodePage% -q >> "%myLogFile%" 2>&1
IF ERRORLEVEL 1 GOTO error
BCP "%theQuery%" queryout "%myDataFile%" -T -S "%theServer%" -a 65535 -c -C %myCodePage% -q >> "%myLogFile%" 2>&1
IF ERRORLEVEL 1 GOTO error
ECHO. >> "%myLogFile%" 2>&1
ECHO Merging files... >> "%myLogFile%" 2>&1
ECHO. >> "%myLogFile%" 2>&1
COPY /A "%myHeaderFile%" + "%myDataFile%" "%theFile%" /B /Y >> "%myLogFile%" 2>&1
IF ERRORLEVEL 1 GOTO error
:cleanup
DEL "%myHeaderFile%" >NUL 2>&1
IF ERRORLEVEL 1 GOTO error
DEL "%myDataFile%" >NUL 2>&1
IF ERRORLEVEL 1 GOTO error
IF /I NOT [%theDebug%]==[Y] (
DEL "%myLogFile%"
)
IF ERRORLEVEL 1 GOTO error
GOTO end
:error
ECHO 
ECHO ERROR: An export error has occured!
IF NOT [%myLogFile: =%]==[] (
ECHO Details can be found in:
ECHO %myLogFile%
)
ECHO 
EXIT /B 1
:syntax
ECHO.
ECHO SYNTAX: %0 "sql query" "output file" [server] [Y]
ECHO -------------------------------------------------------------------------------
ECHO You must specify an SQL query and an output file name in which the results of
ECHO the query will be stored. Specifying a server is optional and defaults to the
ECHO server you are executing on. If a fourth argument is given as Y a log file of
ECHO the command outputs will be saved in the same folder as the output file.
ECHO -------------------------------------------------------------------------------
:end
REM This is the end.

小结：

1、导出带有列名的Excel，可以用BCP，语句最少，但导出的不是真正的Excel文件；

2、使用OpenRowset，可以导出真正的Excel;

3、使用NPOI，可以最大化地满足编程人员的需求，另外也可在导出时再做适当的逻辑处理，另外也不需要xp_cmdshell等额外的权限；

4、最简单的是使用SSIS的导出向导，界面直观，可以直接导出为Excel 2003/2007格式。

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