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Links To Access Code Examples

Create Recordset With AddNew
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Parameterized Queries (VBA)
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FindFirst On Combined Keys
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Execute SQL Delete Records
Commit Form To Table
Report With No Data
Reference Form Objects
DSNLess Connections To MySQL
Print Active Form Record
Count Records in Linked Tables
Delete Empty Tables
Open Linked SQL Tables

 

Create Dynamic Queries Using The Query Builder and Function Calls

The Access Query builder is fast and easy to use. Constructing SQL statements in VBA, however, requires additional attention to syntax and is not as user friendly when reviewing someone else's code.

The purpose of this article is to illustrate how to use the standard query builder and be able to select dynamic information from forms or VBA global variables and use those values to filter a query --- eliminating the need to write complex native SQL statements.

The key to developing dynamic filtering is the special way to code the "Criteria" section of the query builder. Instead of inserting hard coded constants for filtering, function calls can be used to return values from global variables. The developer can also reference form objects for the criteria, but global variables are somewhat easier and don't require a form to be open to successfully deliver values.

The following example shows how to filter a date range selected by a user from two calendar controls: a report start date and a report end date. At a high level, the steps are as follows:

(1) Create a public module that defines and initializes the start and end date global variables
(2) Run this public module at DB startup time using the AUTOEXEC macro
(3) Present the user with the calendar controls to select the date range
(4) Save the dates selected by the Calendar Control to the global variables defined in step (1)
(5) Create two public functions: one to reteurn the start date and one to return the end date
(6) Code a standard query using the query builder and in the criteria section, reference the functions to filter the date (as illustrated later in this document)

 

Program Code For Step 1 - Define and Initialize the Global Date Variables

' *******************************************************
' This Module is Called by the AutoExec Macro at Startup
' It Defines and Initializes the Global Date Variables
' *******************************************************
Option Compare Database
Option Explicit
Public dteGlblReportDateStart As Date
Public dteGlblReportDateEnd As Date

Public Function InitializeReportDateGlobals()
' ***********************************************************************
' Initialize The Dates at Access DB Startup
' ***********************************************************************
dteGlblReportDateStart = #1/1/2050#
dteGlblReportDateEnd = #1/1/2000#
End Function

Create an AutoExec Macro To Initialize Variables

Execute The Initialization Code From AutoExec

Present The User With A Calendar Control To Select The Report Date Range

Name The Calendar Controls in the Properties Area

The two calendar controls are used to update the global area dates when the user selects the dates

Name the Calendar Control for the report start date as "BeginReport"
Name the Calendar Control for the report end date as "EndReport"

Code the Calendar Control click event as shown below:

Calendar Control Event Code

Private Sub BeginReport_Click()
dteGlblReportDateStart = BeginReport.Value
End Sub

Private Sub EnbReport_Click()
dteGlblReportDateEnd = EndReport.Value
End Sub

Code The Functions Used To Return Global Date Values

These public functions (in the regular modules section) are referenced from inside the "Criteria" section of the query. They return the values which were inserted into the global variables by the Calendar Controls.
Public Function GetReportDateStart()
' ***********************************************************************
' Get The Report Start Date
' ***********************************************************************
GetReportDateStart = dteGlblReportDateStart
End Function

Public Function GetReportDateEnd()
' ***********************************************************************
' Get The Report End Date
' ***********************************************************************
GetReportDateEnd = dteGlblReportDateEnd
End Function

Write the Query and Reference The Date Functions