ACC: Query with Criteria Causes ApplyFilter to Fail Silently

• Microsoft Access version 7.0

SYMPTOMS

Advanced: Requires expert coding, interoperability, and multiuser skills.

When you specify a query with criteria as the FilterName argument of an ApplyFilter action, ApplyFilter method, OpenForm action, or OpenForm method, the filter is not applied and you receive no error message.

CAUSE

Microsoft Access does not set the Filter property of the form if you use a query as a filter and the length of the WHERE clause in the query exceeds 256 characters.

RESOLUTION

There are two possible workarounds using Visual Basic for Applications.

This article assumes that you are familiar with Visual Basic for Applications and with creating Microsoft Access applications using the programming tools provided with Microsoft Access. For more information about Visual Basic for Applications, please refer to the "Building Applications with Microsoft Access for Windows 95" manual.

Method 1

You can simulate a filter by setting a form's record source to a query with criteria. For example, if your query with criteria is called Query1, set the form's RecordSource property to Query1 using the following sample code:

   Me.recordsource="Query1"

Method 2

You can use the query's SQL WHERE clause (without the word WHERE) in the Where Condition argument of the ApplyFilter method or OpenForm method. The Where Condition argument for these methods has a physical limit of 32,768 characters.

Here are the basic steps using the sample database Northwind.mdb:

1. Open the sample database Northwind.mdb.

2. Create a new query based on the Order Details table using the following SQL statement:

         SELECT DISTINCTROW [Order Details].OrderID, [Order
         Details].ProductID, [Order Details].UnitPrice, [Order
         Details].Quantity, [Order Details].Quantity FROM [Order Details]
         WHERE ((([Order Details].OrderID)>10500) AND (([Order
         Details].ProductID)=31 Or ([Order Details].ProductID)=12 Or ([Order
         Details].ProductID)=56 Or ([Order Details].ProductID)=14) AND
         (([Order Details].UnitPrice)>5) AND (([Order Details].Quantity)>5))
         OR ((([Order Details].UnitPrice)>100)) OR ((([Order
         Details].Quantity)>120)) OR ((([Order Details].Quantity)>100));
   

3. Close and save the query as TestQuery.

4. Create a new form based on the Order Details table using the AutoForm: Columnar Wizard.

5. Open the new form in Design view.

6. Create a command button, and then view its properties.

7. Set the button's OnClick property to the following event procedure (using the code builder):

       DoCmd.ApplyFilter "TestQuery", "((([Order Details].OrderID)>10500)" & _
       " AND (([Order Details].ProductID)=31 Or " & _
       "([Order Details].ProductID)=12 Or ([Order Details].ProductID)=56" & _
       " Or ([Order Details].ProductID)=14) AND " & _
       " (([Order Details].UnitPrice)>5) AND " & _
       " (([Order Details].Quantity)>5))" & _
       " OR ((([Order Details].UnitPrice)>100)) OR " & _
       " ((([Order Details].Quantity)>120))" & _
       " OR ((([Order Details].Quantity)>100))"
   

8. Switch the form to Form view. Note that there are 2155 records in the form.

9. Click the command button to apply the filter. Note that there are 139 records in the form after the filter is applied.

WARNING: If the WHERE clause contains text criteria in quotation marks, the quotation marks will also need to be concatenated into the SQL statement. For more information about concatenating strings, please see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q136059
   TITLE     : ACC: Errors Concatenating Variables or Controls (2.0/95)

STATUS

Microsoft has confirmed this to be a problem in Microsoft Access version 7.0. This problem no longer occurs in Microsoft Access 97.

MORE INFORMATION

Steps to Reproduce Problem

1. Open the sample database Northwind.mdb.

2. Create a new query using the following SQL statement:

         SELECT DISTINCTROW [Order Details].OrderID, [Order
         Details].ProductID, [Order Details].UnitPrice, [Order
         Details].Quantity, [Order Details].Quantity FROM [Order Details]
         WHERE ((([Order Details].OrderID)>10500) AND (([Order
         Details].ProductID)=31 Or ([Order Details].ProductID)=12 Or ([Order
         Details].ProductID)=56 Or ([Order Details].ProductID)=14) AND
         (([Order Details].UnitPrice)>5) AND (([Order Details].Quantity)>5))
         OR ((([Order Details].UnitPrice)>100)) OR ((([Order
         Details].Quantity)>120)) OR ((([Order Details].Quantity)>100));
   

3. Close and save the query as TestQuery.

4. Create a new form based on the Order Details table using the AutoForm: Columnar Wizard.

5. Open the new form in Design view.

6. Create a command button, and then view its properties.

7. Set the button's OnClick property to the following event procedure (using the Code builder):

         DoCmd.ApplyFilter "TestQuery"
   

8. Switch the form to Form view. Note that there are 2155 records in the form.

9. Click the command button to apply the filter. Note that no filter was applied; there are still 2155 records in the form.

REFERENCES

For more information about the SQL WHERE clause, search on the phrase "where condition," and then view "WHERE Clause (SQL)" using the Answer Wizard from the Microsoft Access for Windows 95 Help menu.

Keywords          : kbusage
Version           : 7.0 97
Platform          : WINDOWS
Hardware          : x86
Issue type        : kbbug
Solution Type     : kbfix