here is the first tip and first post of mine in this blog for reading any data file/database using ADO and jet drivers. You can find proper connection strings on http://www.connectionstrings.com/
As an example we will discover how to read Excel file using Jet driver. It's not as flexible as using direct Excel Automation (using Automation you can access field properties and so on), but if You would like to read plain data - it's much faster solution and easy to implement.
Let's look at code:
define next variables:
Now let's discover code in a codeunit (OnRun trigger):
//Here we must define a filename to read from1: filename:='c:\1.xls';
//Here we must define sheetname of excel file to read
//Now we are creating Connection automation3: CREATE(Connection);
//Here we define a connection string: in our case it‘s a filename as Data Source4: Connection.ConnectionString:='Data Source='+filename; //Define provider (in out case it‘s Jet.OLEDB driver), and additional properties related to Excel//option (using version 8.0), HDR - means is first row// a header to skip it, if your excel file has a header in a first row - use this option to skip it// "IMEX=1;" tells the driver to always read data as text.5: Connection.Provider:='Microsoft.Jet.OLEDB.4.0;Extended Properties="Excel 8.0;HDR=No;IMEX=1";'; //Opening the connection6: Connection.Open();
//Creating Recordset variable7: CREATE(Recordset);
//Opening connection and read data using SELECT * FROM SheetX way, so we are reading all the// data from the sheet8: Recordset.Open(STRSUBSTNO(SELECTSTRING,sheetname),Connection,1,1);
//Now we will start reading Excel file using a loop//Loop started//while not end of recordset - read data9: WHILE NOT Recordset.EOF DO BEGIN 10: Fields:=Recordset.Fields;
//Now we have row data in Fields variable11: MESSAGE(FORMAT(Fields.Item(i).Value));
//Output Column (i) value in a message box- where i variable is an integer12: Recordset.MoveNext;
//Move to the next row in a recordset13:END;
//Loop finished//Stop Reading Excel file//Closing Recordset14: Recordset.Close;
//Clearing Recordset variable15: CLEAR(Recordset);//Closing Connection16: Connection.Close();//Clearing Connection automation variable17: CLEAR(Connection);
Cool! BTW how are you supposed to know Excel book's sheet names? :-) Don't assume they will be always something like 'SheetN'.
You will need some ADO magic.
After opening Connection You can use method
OpenSchema which returns _RECORDSET with the sheets information. So the steps should be:
create new variable tablenames with an automation ADO type of recordset and use this method:
we use number 20 as an enum of schema:
20 - adSchemaTables TABLE_CATALOG
And using repeat clause read sheet names like this:
while Not tablenames.EOF do
Hope it helps!
Igor great tip !!!
here is a next step of this tutorial.
1) SelectSheetName - implementation of sheet selection functionality
2) ReadSheet - reads sheet fully to Excel Buffer
After reading this article You can now replace standart functionality with a new one for fast data reading. So if You're interested please follow my next Blog Post:
DL Tips And Tricks: ADO Database Reader (Jet way) - Excel Example Part 2