Question

I have an INSERT INTO which works fine with the parameters as constants:

INSERT INTO FinalValidityCodes
                      (tblReceivedSamplersID, Substudy, Location, FinalValidityCode, DateTimeProcessed)
SELECT     ID, true, 'I', 0, now()
FROM         tblReceivedSamplers
WHERE     (SampleID = ?)

This would affect 1 row (as expected)

Yet if I change the query to use parameters it will allow it to run but will never affect any rows.

INSERT INTO FinalValidityCodes
                      (tblReceivedSamplersID, Substudy, Location, FinalValidityCode, DateTimeProcessed)
SELECT     ID, ?, ?, ?, ?
FROM         tblReceivedSamplers
WHERE     (SampleID = ?)

What is the difference and why, when I use parameters, does the Insert, seemingly, fail?

Edit:

SampleID is a text datatype.

Answer 1

It looks like the purpose of that INSERT is to add a single row to FinalValidityCodes with values for 5 fields. However, 4 of those values will be supplied directly by query parameters, and ID/tblReceivedSamplersID will be derived from another parameter.

So I would try a DLookup() expression to get the ID (using the parameter for SampleID), and insert that value along with the other 4 parameter values. Here is an untested guess.

INSERT INTO FinalValidityCodes (
    tblReceivedSamplersID,
    Substudy,
    Location,
    FinalValidityCode,
    DateTimeProcessed
    )
VALUES (
    DLookup("ID", "tblReceivedSamplers", "SampleID ='" & param1 & "'"),
    param2,
    param3,
    param4,
    param5
    );