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Tip of the Day
Language: Visual Basic
Expertise: Beginner
Oct 1, 1996



Application Security Testing: An Integral Part of DevOps

Type Mismatch Error

I have an SQL statement in my program that looks like this:
data3.recordsource = "SELECT id, date from reservations where (date = '" & maskededit1.text & "') and (id = " & data1.recordset.fields("movie_id").value & ")"
"date" is declared as Date/Time, "id" and "movie_id" are integers. The program crashes on this statement (which is on the line after the SELECT statement):
It gives me a "Type Mismatch" error. I have spent two days trying to solve this problem.

Try the following to replace your code:

Dim sSQL as String

sSQL = "SELECT id, date FROM reservations WHERE "
sSQL = sSQL + "date = " + CVar(MaskedEdit1.Text)
sSQL = sSQL + " AND id = " + data1.recordset("movie_id")
data3.RecordSource = sSQL
This broke the SQL statement up to make it more readable. CVar converts text to a Variant, which deals with dates much better. In addition, no parentheses are needed in the SELECT statement. Also, to get the field value, you do not use the Fields collection. The Recordset property is a Dynaset, and can be used as such.
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