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The source code in this issue is designed for Visual Basic 3.0. The techniques should work for all versions of VB 3.0 and greater.
In this issue we are going to show how to add an index to a Microsoft Access database from source code. Similiar techniques can be used to add fields and tables to an Access database.
Function DBAddIndex (sDatabaseName As String, sTableName As String, sIndexName As String, sIndexFields As String, bUnique As Integer, bPrimary As Integer) As Integer
To use this function, just add it to any project or module you are working on and call DBAddIndex as described in the Sample Usage section.
Dim bResult As Integer bResult = DBAddIndex("C:\REPORT.MDB", "Monthly Budget", "Date Order", "Year; Acct", False, False) If bResult Then MsgBox "Index appended successfully." End If
The above call adds an index called "Date Order" to a table called [Monthly Budget] consisting of the fields Year and Acct. The index added will be a non-unique and non-primary index.
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This code depends on the feature in Visual Basic that allows you to access all tables as collection. The TableDefs collection has lots of information that can be very useful for your database programming. You can add or delete tables, fields or indexes using this collection of tables. Refer to the Visual Basic help about TableDefs for complete details.
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That concludes this issue of COTW. We hope you find the source code useful in your development.
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