Microsoft KB Archive/164006

= ACC: Cannot Use Intrinsic Constants in Queries, Forms, Reports =

Article ID: 164006

Article Last Modified on 1/19/2007

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APPLIES TO


 * Microsoft Access 95 Standard Edition
 * Microsoft Access 97 Standard Edition

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This article was previously published under Q164006



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



SYMPTOMS
When you use Microsoft Access intrinsic constants in expressions in a query, on a form or a report, or in the Condition column of a macro, you receive an error or you are prompted to enter a parameter.

For example, when you use the StrConv function in the Update To cell of an update query and then run it, you receive the following error message:

Microsoft Access can't update all the records in the update query.

When you use the StrConv function in the Criteria cell of a select query, you receive the following error message:

Data type mismatch in criteria expression.

If you use the StrConv function in an expression in the Field cell of a query, or in the ControlSource property of a control on a report, Microsoft Access prompts you for a parameter value. For example, if you type Expr1: StrConv([CompanyName], vbUpperCase) in the Field cell of a query, and then run it, Microsoft Access prompts you to enter a parameter value for "vbUpperCase."

If you use the StrConv function in the ControlSource property of a control on a form, the control displays #Name? in Form view.

If you use the StrConv function in the Condition column of a macro, you receive the following error message:

Microsoft Access can't find the name ' ' you entered in the expression.

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 your version of the "Building Applications with Microsoft Access" manual.



CAUSE
The query does not recognize the value of the Visual Basic intrinsic constants you used in the function.



RESOLUTION
To work around this behavior, use one of the following methods:  Use the numeric value for the conversion argument instead of the constant. For example, instead of using

Expr1: StrConv([CompanyName],vbProperCase)

use

Expr1: StrConv([CompanyName],3)

For a list of numeric values associated with each of the intrinsic constants used in the conversion argument of the StrConv function, search the Help Index for "StrConv function."

For a list of the numeric values associated with intrinsic constants in other built-in functions in Microsoft Access, search the Help Index for that function.  Create a procedure that contains the built-in function with its intrinsic constant, and then use that procedure in your query. For example, you can create the following procedure in a module: Function UseConstants(FieldName As String) UseConstants = StrConv(FieldName, vbUpperCase) End Function Then you can use the custom procedure in your query expression:

Expr1: UseConstants([CompanyName])





STATUS
This behavior is by design. Intrinsic constants can only be used in Visual Basic for Applications code.



Steps to Reproduce Behavior
 Start Microsoft Access and open the sample database Northwind.mdb.  Create the following new query in Design view based on the Customers table: <pre class="fixed_text">  Query: qryCustomers -  Type: Select Query

Field: CompanyName Table: Customers Criteria: StrConv([CustomerID], vbLowerCase) = "alfki" </li> On the Query menu, click Run. Note that you receive the error "Data type mismatch in criteria expression." Click OK.</li> Delete the Criteria expression and type the following expression in a new column in the QBE grid:

StrConv([CompanyName], vbUpperCase)

</li> On the Query menu, click Run. Note that you are prompted to enter a parameter value for vbUpperCase.

NOTE: If you type the correct numeric value for the vbUpperCase constant (which is 1) in the Enter Parameter Value dialog box, and then click OK, the query runs correctly.</li> Switch the query back to Design view.</li> On the Query menu, click Update Query (or Update in version 7.0).</li> In the QBE grid, delete the column with the StrConv expressions, and set the Update To cell of the CompanyName column to the following expression:

StrConv([CompanyName], vbUpperCase)

</li> On the Query menu, click Run. Click Yes to confirm that you want to update the records, and note that you receive the error "Microsoft Access can't update all the records in the update query." Click No to stop the update.</li></ol>

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