Microsoft KB Archive/210174

= ACC2000: How to Index an Existing Field with Data Access Objects (DAOs) =

Article ID: 210174

Article Last Modified on 6/24/2004

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APPLIES TO


 * Microsoft Access 2000 Standard Edition

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This article was previously published under Q210174



Moderate: Requires basic macro, coding, and interoperability skills.

This article applies only to a Microsoft Access database (.mdb).



SUMMARY
This article shows you how to use Data Access Objects (DAOs) to create a compound (multiple-field) index in an existing table.



MORE INFORMATION
An Index object contains the fields that are being indexed and usually contains only a single field. The Index object created in the following example has two fields appended to it, creating a multiple-field index.

NOTE: The sample code in this article uses Microsoft Data Access Objects. For this code to run properly, you must reference the Microsoft DAO 3.6 Object Library. To do so, click References on the Tools menu in the Visual Basic Editor, and make sure that the Microsoft DAO 3.6 Object Library check box is selected.

 Start Microsoft Access and open any database. In the Database window, click Tables, and then click New to create the following new table in Design View:

Table: Interviews

Field Name: CustomerID

Data Type: Number

Field Size: Long Integer

Field Name: InterviewerID

Data Type: Number

Field Size: Long Integer

Field Name: Appointment

Data Type: Date/Time

 Save the table as Interviews, and then close it. Do not create a primary key.  In the Database window, click Modules, click New to create a new module, and then type the following procedure: '--- 'PURPOSE: Adds a multiple-field index to a table. 'ACCEPTS: Nothing. 'RETURNS: Nothing. '---

Function AddMultiIndex Dim dbs As DAO.Database, tdf As DAO.TableDef Dim idx As DAO.Index, fld As DAO.Field

Set dbs = CurrentDb

' Open the table definition. Set tdf = dbs.TableDefs("Interviews")

' Create an index called PrimaryKey for this TableDef ' and turn on the Primary and Required properties. Set idx = tdf.CreateIndex("PrimaryKey") With idx .Name = "PrimaryKey" .Primary = True .Required = True .IgnoreNulls = False End With

' Create an index field with the same name as a table field, ' then append it to the index. Set fld = idx.CreateField("CustomerID") idx.Fields.Append fld

' Do the second field the same way. Set fld = idx.CreateField("InterviewerID") fld.Attributes = dbDescending idx.Fields.Append fld

' Append the index to the TableDef. tdf.Indexes.Append idx

End Function  To test this function, type the following line in the Immediate window, and then press ENTER:

? AddMultiIndex

 Open the Interviews table in Design view. Note the compound primary key on the CustomerID and InterviewerID fields.</li></ol>

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