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공지사항

태그목록

[주의] 레지스트리를 수정하는 내용이니 주의해서 사용하세요.



C# 으로 OleDB를 이용해서 Excel을 읽어 들이고, Sqlite(.db)로 변환하는 Converter를 만들어서 사용하는 데


긴 문자열을 넣었더니 잘려서 컨버팅 되길래 확인해보니 255 글자 제한이 걸려 있다.


검색해서 확인해보니 여러가지 해결방법들이 포스팅 돼 있는데 조금씩 안맞아서 확인해보고 정리해서 올려 놓는다.



[레지스트리 수정으로 255 글자 제한 풀기]


아래 버전 및 OS bit에 맞는 레지스트리를 찾아가서 TypeGuessRows 값을 0으로 바꾸면 된다.

(기본 값은 8인데, DataSet을 만들 때 기본으로 설정 된 윗 8줄에 있는 가장 큰 글자수를 DataType 길이로 잡는다고 한다.

 기본 글자 제한은 255자이고, 0으로 바꾸면 전체를 검사해서 DataType 길이로 잡는다고 함.)


[주의] 성능상의 이유로 글자수를 제한(Default:8) 하는 거라고 하니 


  [Windowns 32bit]

Excel 2000, 2003 (xls)

  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Jet\4.0\Engines\Excel

  (Excel 97 = 3.5)


- Excel 2013 (xlsx)

  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\15.0\Access Connectivity Engine\Engines\Excel

  (2013 = 15.0, 2010 = 14.0, 2007 = 12.0)


  [Windowns 64bit]

Excel 2000, 2003 (xls)

  HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Jet\4.0\Engines\Excel

  (Excel 97 = 3.5)


- Excel 2013 (xlsx)

  HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\15.0\Access Connectivity Engine\Engines\Excel

 (2013 = 15.0, 2010 = 14.0, 2007 = 12.0)



[레지스트리 파일 다운로드]

Fix_255_Char_32bit_Excel_2000_2003.reg

Fix_255_Char_32bit_Excel_2013.reg

Fix_255_Char_64bit_Excel_2000_2003.reg

Fix_255_Char_64bit_Excel_2013.reg



    [Excel 데이터 수정으로 255 글자 제한 풀기] (확인 안해봤음)


- 위에도 적었지만 DataSet을 만들 때 기본으로 설정 된 윗 8줄에 있는 가장 큰 글자수를 DataType 길이로 잡는다고 한다.

  8줄 이내에 255 글자 이상의 사용하지 않는 Dummy 데이터를 넣으면 해결 된다고 함. 




[참조] http://www.todal.net/241?category=367351

[참조] http://it-developer.tistory.com/427

[참조] http://lemondory.tistory.com/129

[참조] http://ariswear.tistory.com/37

Posted by blueasa
TAG 255, Excel, odbc, 짤림

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원본 : http://www.connectionstrings.com/excel



Connection strings for Excel

Developers Community

Find solutions and post questions regarding connection string related issues.

Forum for Excel

Microsoft Jet OLE DB 4.0

TYPE OLE DB Provider
USAGE Provider=Microsoft.Jet.OLEDB.4.0
MANUFACTURER Microsoft

Standard

Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\MyExcel.xls;
Extended Properties="Excel 8.0;HDR=Yes;IMEX=1";
 

Standard alternative

Try this one if the one above is not working. Some reports that Excel 2003 need the exta OLEDB; section in the beginning of the string.

OLEDB;Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\MyExcel.xls;
Extended Properties="Excel 8.0;HDR=Yes;IMEX=1";

Important note!
The quota " in the string needs to be escaped using your language specific escape syntax.
c#, c++   \"
VB6, VBScript   ""
xml (web.config etc)   "
or maybe use a single quota '.

"HDR=Yes;" indicates that the first row contains columnnames, not data. "HDR=No;" indicates the opposite.

"IMEX=1;" tells the driver to always read "intermixed" (numbers, dates, strings etc) data columns as text. Note that this option might affect excel sheet write access negative.

SQL syntax "SELECT [Column Name One], [Column Name Two] FROM [Sheet One$]". I.e. excel worksheet name followed by a "$" and wrapped in "[" "]" brackets.

Check out the [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Jet\4.0\Engines\Excel] located registry REG_DWORD "TypeGuessRows". That's the key to not letting Excel use only the first 8 rows to guess the columns data type. Set this value to 0 to scan all rows. This might hurt performance. Please also note that adding the IMEX=1 option might cause the IMEX feature to set in after just 8 rows. Use IMEX=0 instead to be sure to force the registry TypeGuessRows=0 (scan all rows) to work.

If the Excel workbook is protected by a password, you cannot open it for data access, even by supplying the correct password with your connection string. If you try, you receive the following error message: "Could not decrypt file."

A workaround for the "could not decrypt file" problem

 
 

ACE OLEDB 12.0

TYPE OLE DB Provider
USAGE Provider=Microsoft.ACE.OLEDB.12.0
MANUFACTURER Microsoft

Excel 97-2003 Xls files with ACE OLEDB 12.0

You can use this connection string to use the Office 2007 OLEDB driver (ACE 12.0) to connect to older 97-2003 Excel workbooks.

Provider=Microsoft.ACE.OLEDB.12.0;Data Source=c:\myFolder\myOldExcelFile.xls;
Extended Properties="Excel 8.0;HDR=YES";

"HDR=Yes;" indicates that the first row contains columnnames, not data. "HDR=No;" indicates the opposite.

 
 

.NET Framework Data Provider for OLE DB

TYPE .NET Framework Wrapper Class Library
USAGE System.Data.OleDb.OleDbConnection
MANUFACTURER Microsoft

Use an OLE DB provider from .NET

Provider=any oledb provider's name;OledbKey1=someValue;OledbKey2=someValue;

See the respective OLEDB provider's connection strings options. The .net OleDbConnection will just pass on the connection string to the specified OLEDB provider. Read more here.

 
 

Microsoft Excel ODBC Driver

TYPE ODBC Driver
USAGE Driver={Microsoft Excel Driver (*.xls)}
MANUFACTURER Microsoft

Standard

Driver={Microsoft Excel Driver (*.xls)};DriverId=790;Dbq=C:\MyExcel.xls;
DefaultDir=c:\mypath;

SQL syntax "SELECT [Column Name One], [Column Name Two] FROM [Sheet One$]". I.e. excel worksheet name followed by a "$" and wrapped in "[" "]" brackets.

 
 

Specify ReadOnly

[Microsoft][ODBC Excel Driver] Operation must use an updateable query. Use this connection string to avoid the error.

Driver={Microsoft Excel Driver (*.xls)};Dbq=C:\MyExcel.xls;ReadOnly=0;

ReadOnly = 0 specifies the connection to be updateable.

 
 

Microsoft Excel 2007 ODBC Driver

TYPE ODBC Driver
USAGE Microsoft Excel Driver (*.xls, *.xlsx, *.xlsm, *.xlsb)
MANUFACTURER Microsoft

Standard

Driver={Microsoft Excel Driver (*.xls, *.xlsx, *.xlsm, *.xlsb)};DBQ=C:\MyExcel.xls;
 
 

.NET Framework Data Provider for ODBC

TYPE .NET Framework Wrapper Class Library
USAGE System.Data.Odbc.OdbcConnection
MANUFACTURER Microsoft

Use an ODBC driver from .NET

Driver={any odbc driver's name};OdbcKey1=someValue;OdbcKey2=someValue;

See the respective ODBC driver's connection strings options. The .net OdbcConnection will just pass on the connection string to the specified ODBC driver. Read more here.

 
 

.NET xlReader for Microsoft Excel

TYPE .NET Framework Class Library
USAGE VM.xPort.ExcelClient.ExcelConnection
MANUFACTURER xPortTools

Excel file with header row

Data Source =c:\myExcelFile.xls;HDR=yes;Format=xls;
 
 

Excel file without header row

Data Source =c:\myExcelFile.xls;HDR=no;Format=xls;
 
 


Posted by blueasa
TAG Excel, odbc, OLEDB

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