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Dim cc As CommandBarComboBox
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Part 6: Excel and the Outside World: Collaborating Made Easy
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Excel Query Program
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On Error Resume Next
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Set c = Application.CommandBars("Excel2k3 VBA Query")
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Set cc = c.FindControl(, , "Excel2k3 VBA Query Statement")
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If Not cc Is Nothing Then
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cc.Text = Query.Text End If End Sub
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Notice that saving the query in this fashion triggers the OnAction event associated with this control, which is the EnterDatabaseQuery routine located in the ThisWorkbook module, which is shown here. This routine scans the list of queries stored in the control and appends the new query to the end if it isn t found, letting users rerun a particular query quickly.
Sub EnterDatabaseQuery()
Dim Dim Dim Dim c As CommandBar
cc As CommandBarComboBox
q As String
i As Long
On Error Resume Next
Set c = Application.CommandBars("Excel2k3 VBA Query")
Set cc = c.FindControl(, , "Excel2k3 VBA Query Statement")
If Not cc Is Nothing Then
q = cc.Text i = 1 Do While i <= cc.ListCount If q = cc.List(i) Then Exit Sub End If i = i + 1 Loop cc.AddItem cc.Text End If
Part 6: Excel and the Outside World: Collaborating Made Easy
24
This routine begins by locating the CommandBarComboBox control, and then saves the value from the Text property into a temporary variable named q. Next the routine uses a Do While loop to scan through the list of queries stored in the drop-down list. If a match is found, the Exit Sub statement ends the routine without action. If no match is found, the AddItem method is used to add the query to the end of the list of drop-down items.
Microsoft Office Excel 2003 Programming Inside Out Note One limitation of this approach is that the queries are lost when the user exits Excel. The program shouldn t take up a lot of space in the Windows registry just to store the history of queries, and, while this version of the program doesn t use an external file that would need to be loaded and saved each time Excel starts, it would be straightforward to add a Save/Load set of dialog boxes to this form that would let you save an individual query to disk.
Executing a Database Query
Clicking the Run Query button on the Excel2k3 VBA Query command bar runs the query currently selected in the ComboBox on the command bar.
Getting the Information to Run the Query
In the ThisWorkbook module, the RunDatabaseQuery routine, shown here, builds a connec tion string using the BuildConnectionString function and gets the query string from the combo box on the command bar using the GetDBQuery routine. The Trim function is used to delete any unnecessary blanks as the beginning and the end of the strings.
For more information on using text functions to clean up your data, see 9, Manipulating Data with VBA .
Sub RunDatabaseQuery() Dim c As String Dim q As String c = Trim(BuildConnectionString) q = Trim(GetDBQuery) If Len(c) = 0 Then DBInfo.Show vbModal ElseIf Len(q) = 0 Then DBQuery.Show vbModal Else RunQuery c, q End If End Sub
Part 6: Excel and the Outside World: Collaborating Made Easy
24
Excel Query Program The length of each temporary variable holding the connection string and the query is verified to be non-zero. If the length is zero, the appropriate form is displayed to the user to fill in the necessary information. When the form is closed, the user must hit the Run Query button to try the query again. Assuming that there is information in the connection string and the query string, the RunQuery routine is called to execute the query with both the connection string and the query string passed as parameters.
Building a Connection String
The following BuildConnectionString routine creates a connection string from information previously stored in the Windows registry. The routine, which is located in the ThisWorkbook module, begins by declaring a number of temporary variables that will hold the information extracted from the registry, along with another temporary variable c that will hold final return value from the function.
Function BuildConnectionString() As String Dim c As String Dim Dim Dim Dim Dim Dim Dim DBName As String
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