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XL2000: How to Use Data Access Objects to Join Tables of Different Formats


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This article was previously published under Q213820

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Summary

Microsoft Excel 2000 provides Data Access Objects (DAO) for Microsoft Visual Basic to allow you to access external databases. Microsoft Query and the Open Database Connectivity (ODBC) add-in (Xlodbc.xla) do not provide a direct means for you to join tables of different database formats. By using DAO, you can join tables of different database formats by attaching the tables to a Jet database. An attached table, or linked table, is a table in another database linked to a Microsoft Jet database. Data for attached tables remains in the external database.

This article provides an example of how to attach tables of different database formats to a Jet database so that the tables may be joined.

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More information

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The following sample macro attaches two tables to a newly created Jet database (Temp.mdb). One table is called Orders, and is in the Microsoft Excel format. The other table is called Employee, and is in the dBASE IV format.

The dBASE IV file used in this example is the sample file Employee.dbf, which is included with Microsoft Query. You can find the sample dBASE IV files in the following default location:
C:\Program Files\Microsoft Office\Office
To create the Excel file used in this example, follow these steps:
  1. In Excel, create a new workbook.
  2. Type the following data in cells A1:E3 on Sheet1:
       A1: Order_ID B1: Custmr_ID C1: Employ_ID D1: Order_Date E1: Order_Amt
       A2: 88000    B2: WALNG     C2: '111      D2: 1/1/97     E2: 111.00
       A3: 88001    B3: HIGHG     C3: '333      D3: 1/2/97     E3: 222.00
    						
    NOTE: Include the apostrophe before the numbers in cells C2 and C3, as shown, to convert the values to text.
  3. Select cells A1:E3. On the Insert menu, point to Name, and then click Define. Type Orders, and then click OK.
  4. Save the workbook as C:\My Documents\Orders.xls.
  5. Close the workbook.
  6. Create a new workbook.
  7. Press ALT+F11 to start the Visual Basic Editor, and then on the Insert menu, click Module.
  8. On the Tools menu, click References. Select Microsoft DAO 3.6 Object Library, and then click OK.
  9. Type the following code in the module sheet:
    Sub JoinTables()
    Dim db As database
    Dim rs As recordset
    Dim OrdersTable As tabledef, EmpTable As tabledef
       'Create a temporary Jet database called Temp.MDB
       Set db = createdatabase("C:\My Documents\Temp.mdb", dbLangGeneral)
       'Attach the Excel table "Orders" from the file Orders.xls to the
       'database
       Set OrdersTable = db.CreateTableDef("Orders")
       OrdersTable.Connect = "Excel 5.0;DATABASE=C:\My Documents\ORDERS.XLS"
       OrdersTable.SourceTableName = "Orders"
       db.TableDefs.Append OrdersTable
       'Attach the dBASE IV table "Employee" to the database
       '** Note: You may need to change the path to the sample dBASE
       '   files for your installation of Excel.
       Set EmpTable = db.CreateTableDef("Employee")
       EmpTable.Connect = _
             "dBASE IV;DATABASE=C:\Program Files\Microsoft Office\Office"
       EmpTable.SourceTableName = "Employee"
       db.TableDefs.Append EmpTable
       'Create the recordset -- Return the Order_ID from the Orders
       'table and
       'The First_name and Last_Name from the Employee table where the
       'Employ_ID in the Employee table matches the Employ_ID in the Orders
       'table
       Set rs = db.OpenRecordset("SELECT orders.ORDER_ID, " & _
          "employee.FIRST_NAME, employee.LAST_NAME FROM employee, orders " & _
          "WHERE employee.EMPLOY_ID = orders.EMPLOY_ID", dbOpenDynaset)
       'Copy the recordset to Sheet1!A1
       Sheets("Sheet1").Range("A1").CopyFromRecordset rs
       'Close the database and delete the database file Temp.mdb
       db.Close
       Kill "c:\my documents\temp.mdb"
    End Sub
    					

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Keywords: KB213820, kbprogramming, kbinfo, kbhowto, kbdtacode

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Article Info
Article ID : 213820
Revision : 8
Created on : 11/23/2006
Published on : 11/23/2006
Exists online : False
Views : 307