【摘录】数据库连接参数

一、Microsoft Excel

1  Microsoft ACE OLEDB 12.0

1.1  Xlsx files（2013）

Connect to Excel 2007 (and later) files with the Xlsx file extension. That is the Office Open XML format with macros disabled.

Provider=Microsoft.ACE.OLEDB.12.0;Data Source=c:\myFolder\myExcel2007file.xlsx;Extended Properties="Excel 12.0 Xml;HDR=YES";

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

1.2  Treating data as text（2013）

Use this one when you want to treat all data in the file as text, overriding Excels column type "General" to guess what type of data is in the column.

Provider=Microsoft.ACE.OLEDB.12.0;Data Source=c:\myFolder\myExcel2007file.xlsx;Extended Properties="Excel 12.0 Xml;HDR=YES;IMEX=1";

• If you want to read the column headers into the result set (using HDR=NO even though there is a header) and the column data is numeric, use IMEX=1 to avoid crash.
• To always use IMEX=1 is a safer way to retrieve data for mixed data columns. Consider the scenario that one Excel file might work fine cause that file's data causes the driver to guess one data type while another file, containing other data, causes the driver to guess another data type. This can cause your app to crash.

1.3  Xlsm files（2013）

Connect to Excel 2007 (and later) files with the Xlsm file extension. That is the Office Open XML format with macros enabled.

Provider=Microsoft.ACE.OLEDB.12.0;Data Source=c:\myFolder\myExcel2007file.xlsm;Extended Properties="Excel 12.0 Macro;HDR=YES";

1.4  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";

2  Microsoft Jet OLE DB 4.0

2.1  Standard (Excel)（2003）

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

2.2  Standard alternative（2003）

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";

• "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.
• "SELECT * FROM [Sheet1$a5:d]", start picking the data as of row 5 and up to column D.
• 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."

3  Microsoft Excel 2007 ODBC Driver

3.1  Standard (for versions 97 - 2003)

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

3.2  Standard (for versions 2007 - 2013)

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

4  Microsoft Excel ODBC Driver

4.1  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.

4.2  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.

二、Microsoft Access

1  Microsoft ACE OLEDB 12.0

1.1  Standard security

Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\myFolder\myAccessFile.accdb;Persist Security Info=False;

1.2  With database password

This is the connection string to use when you have an Access 2007 - 2013 database protected with a password using the "Set Database Password" function in Access.

Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\myFolder\myAccessFile.accdb;Jet OLEDB:Database Password=MyDbPassword;

• Some reports of problems with password longer than 14 characters. Also that some characters might cause trouble. If you are having problems, try change password to a short one with normal characters.
• Note! Reports say that a database encrypted using Access 2010 - 2013 default encryption scheme does not work with this connection string. In Access; try options and choose 2007 encryption method instead. That should make it work. We do not know of any other solution. Please get in touch if other solutions is available!

1.3  Standard security (mdb file)

Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\myFolder\myAccessFile.mdb;Persist Security Info=False;

1.4  With database password (mdb file)

This is the connection string to use when you have an Access 97 - 2003 database protected with a password using the "Set Database Password" function in Access.

Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\myFolder\myAccessFile.mdb;Jet OLEDB:Database Password=MyDbPassword;

Some reports of problems with password longer than 14 characters. Also that some characters might cause trouble. If you are having problems, try change password to a short one with normal characters.

2  Microsoft Jet OLE DB 4.0

2.1  Standard security

Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\mydatabase.mdb;User Id=admin;Password=;

2.2  With database password

This is the connection string to use when you have an access database protected with a password using the Set Database Password function in Access.

Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\mydatabase.mdb;Jet OLEDB:Database Password=MyDbPassword;

Some reports of problems with password longer than 14 characters. Also that some characters might cause trouble. If you are having problems, try change password to a short one with normal characters.

3  Microsoft Access accdb ODBC Driver

3.1  Standard security

Driver={Microsoft Access Driver (*.mdb,*.accdb)};Dbq=C:\mydatabase.accdb;Uid=Admin;Pwd=;

4  Microsoft Access ODBC Driver

4.1  Standard security

Driver={Microsoft Access Driver(*.mdb)};Dbq=C:\mydatabase.mdb;Uid=Admin;Pwd=;

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