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It then uses ADO to connect to the workbook and opens a Recordset on a table that is a defined range in the workbook. This sample creates a copy of OrdersTemplate.xls. A form for the demonstration appears.Ĭlick Sample 1.
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This sample code works with both ADO 2.5 and ADO 2.6, so select the version appropriate to your computer. for DDL and Security and Microsoft ActiveX Data Objects Library. On the Project menu, select References, and then set references to Microsoft ADO Ext. In Visual Basic, open the ExcelADO.vbp file. The files included are as follows:Įxtract the contents of the. The ExcelADO.exe file contains a Visual Basic Standard EXE project, Active Server Pages (ASP), Excel 97 and Excel 2000 Workbooks that act as templates, and a Microsoft Access 2000 database. The number of rows to scan defaults to eight (8) rows you can change the number of rows to scan by specifying a value between one (1) and sixteen (16) for the MAXSCANROWS setting in the extended properties of your connection string. Instead, the OLE DB provider scans a limited number of rows in a column to "guess" the data type for the field. Unlike a traditional database, there is no direct way to specify the data types for columns in Excel tables. If the first row does not contain headers, the OLE DB provider automatically names the fields for you (where F1 would represent the first field, F2 would represent the second field, and so forth).
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If the first range does not contain headers, you can specify HDR=NO in the extended properties in your connection string. With Excel workbooks, the first row in a range is considered to be the header row (or field names) by default. oRS.Open "Select * from ", oConn, adOpenStatic Use a range with a specific address (for example, ). oRS.Open "Select * from Table1", oConn, adOpenStatic Use a range with a defined name (for example, ). A workbook table that is referenced in this manner consists of the entire used range of the worksheet. Use the sheet name followed by a dollar sign (for example, or ). There are several ways you can reference a table (or range) in an Excel workbook: Properties("Extended Properties").Value = "Excel 8.0" The following samples demonstrate an ADO connection to an Excel 97 (or 2000) workbook: The ExcelADO.exe sample uses Excel workbooks in the Excel 97 and Excel 2000 format. NOTE: Use the Excel 5.0 source database type for Microsoft Excel 5.0 and 7.0 (95) workbooks and use the Excel 8.0 source database type for Microsoft Excel 8.0 (97) and 9.0 (2000) workbooks. The Jet OLE DB Provider supports the following database types for Microsoft Excel workbooks: In order to open external formats supported by the Microsoft Jet 4.0 OLE DB Provider, you specify the database type in the extended properties for the connection. The Microsoft Jet database engine can be used to access data in other database file formats, such as Excel workbooks, through installable Indexed Sequential Access Method (ISAM) drivers. Jet OLE DB Provider Specifics for Excel Workbooks If you require "conditional" formatting after the data is inserted, you can accomplish this formatting with Automation or with a macro in the workbook. However, you can transfer data to a workbook that is pre-formatted and the format is maintained. You cannot use ADO to apply formats or formulas to cells. ADO presents you with a more scaleable solution to handle data in a workbook.ĪDO can be used strictly to transfer raw data to a workbook. For Web applications, it is not always desirable to automate Microsoft Excel. ADO runs in-process, and saves the overhead of costly out-of-process calls. Microsoft Excel is an out-of-process ActiveX server.
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The use of ADO to transfer data to or retrieve data from an Excel workbook gives you, the developer, several advantages over Automation to Excel: The ExcelADO.exe sample illustrates how you can use ActiveX Data Objects (ADO) with the Microsoft Jet OLE DB 4.0 Provider to read and write data in Microsoft Excel workbooks.
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ExcelADO demonstrates how to use ADO to read and write data in Excel workbooks Summary