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06.10.2008 at 10:31AM PDT, ID: 23473195
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4.2

Eval() function and formula templates

Asked by cpmasesa in SQL Query Syntax, Microsoft Access Database, Access Architecture/Design

Tags: , ,

Hi,

I am trying to use formula templates in my application

I have table with the formula templates for different scenarios. TableName = CorrRules. Each scenario has a scenarioID in this table. One of my formuala templates is
[ProbVar]&" == " & [ProbVal]. This is stored in the field Formula2Use

I have another table, TableName = Checks, which I need to use to create my desired output based on the formula templates. Each record in this table also has a scenarioID

I link the tables on ScenarioID and create the field
myformula: eval_mmm([formula2Use])

Eval_mmm() is a wraper function:
Public Function eval_mmm2(str2evaluate As string)
 eval_mmm = Eval(QuotedStr(str2Evaluate))
End Function

QuotedStr is another wrapper function defined as follows:
Public Function QuotedStr(String2Quote) As String
    QuotedStr = Chr(34) & String2Quote & Chr(34)
End Function


When I run this code I get MyFormula returning 0 (zero)

However when I write myformula as:
eval_mmm([ProbVar]&" == " & [ProbVal])

replace Formula2Use, the field holding my formula template, with the actual formula template it works!

Why does it fail in the first instance?

TIA

ClemensStart Free Trial
 
Keywords: Eval() function and formula templates
Title
1 Formulas stored as text in a table!!…
2 Eval()
3 using Eval
4 PHP eval() function
5 Convert Text to a formula
6 Delphi eval(); function
 
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About this solution

Zones: SQL Query Syntax, Microsoft Access Database, Access Architecture/Design
Tags: Microsoft, Access, 2003
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Solution Provided By: cpmasesa
Participating Experts: 2
Solution Grade: A
 
 
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