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Recordset Null Value not being detected in null check


Recordset Null Value not being detected in null check

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Recordset Null Value not being detected in null check
Tag : development , By : cheese_doodle
Date : November 27 2020, 03:01 PM

fixed the issue. Will look into that further There is a method similar to the IsDBNull that mthod exists in VB.NET.
The method, IsNull, takes a parameter (rsPeriod.Fields(0)) and returns a boolean value.
If IsNull(rsPeriod.Fields(0)) Then
   TurnoverPTD = 0
Else
   TurnoverPTD = rsPeriod.Fields(0)
End If

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"Invalid use of Null" when using Str() with a Null Recordset field, but Str(Null) works fine


Tag : vb6 , By : user157654
Date : March 29 2020, 07:55 AM
help you fix your problem The Str function will specifically check if a Null value is passed in and deal with it accordingly. When you pass in an object it attempts to convert the result of a default method to a String. The result of the default method is not passed into the Str method, but Field object is, so a check for the initial Null will fail. The Str function will continue to check the parameter type for datatypes that it supports when it realizes that it has an object, it will attempt to retrieve the default value. It doesn't re-attempt to deal with the default value as it did with the passed in argument, so the attempt to return a Null as a String will fail. It seems MS didn't expect a default value to be Null or any other invalid value for Str. For instance Str doesn't support an empty string either.

ASP Classic check for database NULL value in Recordset


Tag : development , By : Nulq
Date : March 29 2020, 07:55 AM
This might help you I'm getting an ADODB Recordset and I need to check the value of a nullable column in ASP Classic. How can I tell whether it's null? AFAIK IsDBNull doesn't exist in ASP Classic, and all the Null testers ask whether the object is null, not its value. , Try this, it should work if you are using MS SQL
IF IsNull(RS("myCol")) = False THEN
  IF RS("myCol") THEN
    Response.Write "myCol is TRUE"
  ELSE
    Response.Write "myCol is False"
  END IF
ELSE
  Response.Write "myCol is NULL"
END IF
IF RS("myCol")<>"" THEN
  IF RS("myCol") THEN
    Response.Write "myCol is TRUE"
  ELSE
    Response.Write "myCol is False"
  END IF
ELSE
  Response.Write "myCol is NULL"
END IF

VBA DAO.Recordset is null or not set when trying to close it - But I check if its null beforehand


Tag : vba , By : Chris Hubbard
Date : March 29 2020, 07:55 AM
This might help you In an access application's VBA code there is a function to convert some database fields over to another format. This happens for 2 tables, in code you can tell them appart by the 2 loops, for BOM and ROUTING. This code had poor performance because sometimes 200000+ records passed through it. In order to speed it up I added transactions to it- its 3x as fast now. However, when trying to close the ROUTING recordset, I get an error saying "object invalid or no longer set". Therefor I added 2 checks to it, a not nothing and not null before I attempt to close it. when stepping through with the debugger it passes both checks and then attempts to close the recordset, then goes to ErrorHandler which gives the message. What makes this error extra weird is that it has no problems closing the BOM recordset for the first loop. Code: , You need to close the Recordset before closing the Workspace.
Workspace.CommitTrans

If Not ROUTING Is Nothing Then
    ROUTING.Close
    Set ROUTING= Nothing
End If

Workspace.Close
Set Workspace = Nothing

VBA ADODB recordset field is Null from MySQL - is there an easy way to check or prevent "NULL"?


Tag : mysql , By : user158193
Date : March 29 2020, 07:55 AM
To fix the issue you can do I pull a large recordset from a MySQL server and I assign a bunch of variables in an Excel VBA routine based on the field position, e.g.: , Use a function like that
Option Explicit

Function rcdString(rcdField As Variant) As String

    If IsNull(rcdField) Then
        rcdString = ""
    Else
        rcdString = rcdField.Value
    End If

End Function
x = rcdString(MyRecordset.Fields(0))

MySQL inner join error : During the execution of the query was detected to be null. Primary keys must not contain null


Tag : java , By : sep
Date : March 29 2020, 07:55 AM
Hope that helps I have solved this issue by removing the mapped class i.e. Record.class and using
Object[] alert = threatList.get(i);
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