VS 2003
The documentation says " Nothing keyword represents the default value of any
data type" this is simply not true and causing a lot of problems.
1) Consider an SQL table of 3 columns:
Column1 bit no nulls
Column2 string no nulls
Column3 DateTime no nulls
2) then, set each column in a DataSet, DataRowto nothing
Column1 = nothing ' should be 0 false
Column2 = nothing ' should be string.empty
Column3 = nothing ' should be 01/01/0001
If you look at the values in DataRow, Column 1,2 & 3 they do not reflect the
defaults, although they all have some value in them (particularly true with
DateTime)
3) Now, using a DataAdapter for the table add the DataRow to the DataSource.
It fails everytime with a message like: "Cannot write null to non-nullable
Column1".
4) If you manually set the DataRow columns (1,2,3) to their default values,
it works every time.
What does that mean? Nothing does not work. Very frustrating.
Please advise.
Bob Day
6  1703 
Bob, setting the column to nothing does just that, it sets it to the default
value of the object not to the default value that you assigned the object.
Column1 = nothing
Then try referencing Column1 will give you a null reference exception. All
of those columns are now null, so if you try adding a row with them in it,
you'll get that exception.
The confusion comes from the word Default. Any given column can havea
default value that you assign. The Default value for a Column is nothing,
meaning that you haven't defined it yet.
Try setting Column2 to string.Empty for instance, Column1 to 0 and column3
to 01/01/0001 and it will work. Also, since you set them to nothing, they
very well may be garbage collected and cease to exist.
HTH,
Bill
"Bob Day" <Bo****@TouchTa lk.net> wrote in message
news:ON******** *****@TK2MSFTNG P10.phx.gbl... VS 2003
The documentation says " Nothing keyword represents the default value of
any data type" this is simply not true and causing a lot of problems.
1) Consider an SQL table of 3 columns:
Column1 bit no nulls
Column2 string no nulls
Column3 DateTime no nulls
2) then, set each column in a DataSet, DataRowto nothing
Column1 = nothing ' should be 0 false
Column2 = nothing ' should be string.empty
Column3 = nothing ' should be 01/01/0001
If you look at the values in DataRow, Column 1,2 & 3 they do not reflect
the defaults, although they all have some value in them (particularly true
with DateTime)
3) Now, using a DataAdapter for the table add the DataRow to the
DataSource.
It fails everytime with a message like: "Cannot write null to non-nullable
Column1".
4) If you manually set the DataRow columns (1,2,3) to their default
values, it works every time.
What does that mean? Nothing does not work. Very frustrating.
Please advise.
Bob Day
I really don't understand the distinction you are tyring to make. Below is
the documentation.
It says that dim x as boolean = nothing, then x should have a value of
False, the same as if you did dim x as boolean = false.
In other words, these two sould produce the same value:
1) dim x as boolean = nothing
2) dim x as boolean = false
1 fails, 2 writes to a datasource just fine.
Default, as defined below, is the default of the data type, not <NULL>.
Please help me understand.
Bob
Documentation for help:
The Nothing keyword represents the default value of any data type. Assigning
Nothing to a variable sets it to the default value for its declared type. If
that type contains variable members, they are all set to their default
values. The following example illustrates this:
Public Structure MyStruct
Public Name As String
Public Number As Short
End Structure
Dim S As MyStruct, I As Integer, B As Boolean
S = Nothing ' Sets S.Name to Nothing, S.Number to 0.
I = Nothing ' Sets I to 0.
B = Nothing ' Sets B to False.If the variable is of a reference type -
that is, an object variable - Nothing means the variable is not associated
with any object. For example:
Dim MyObject As Object
MyObject = Nothing ' No object currently referred to.When you assign
Nothing to an object variable, it no longer refers to any object instance.
If the variable had previously referred to an instance, setting it to
Nothing does not terminate the instance itself. The instance is terminated,
and the memory and system resources associated with it are released, only
after the garbage collector detects there are no active references
remaining.
"William Ryan" <do********@nos pam.comcast.net > wrote in message
news:OH******** ******@TK2MSFTN GP10.phx.gbl... Bob, setting the column to nothing does just that, it sets it to the
default value of the object not to the default value that you assigned the object.
Column1 = nothing
Then try referencing Column1 will give you a null reference exception.
All of those columns are now null, so if you try adding a row with them in it,
you'll get that exception.
The confusion comes from the word Default. Any given column can havea
default value that you assign. The Default value for a Column is nothing,
meaning that you haven't defined it yet.
Try setting Column2 to string.Empty for instance, Column1 to 0 and column3
to 01/01/0001 and it will work. Also, since you set them to nothing, they
very well may be garbage collected and cease to exist.
HTH,
Bill
"Bob Day" <Bo****@TouchTa lk.net> wrote in message
news:ON******** *****@TK2MSFTNG P10.phx.gbl... VS 2003
The documentation says " Nothing keyword represents the default value of
any data type" this is simply not true and causing a lot of problems.
1) Consider an SQL table of 3 columns:
Column1 bit no nulls
Column2 string no nulls
Column3 DateTime no nulls
2) then, set each column in a DataSet, DataRowto nothing
Column1 = nothing ' should be 0 false
Column2 = nothing ' should be string.empty
Column3 = nothing ' should be 01/01/0001
If you look at the values in DataRow, Column 1,2 & 3 they do not reflect
the defaults, although they all have some value in them (particularly true
with DateTime)
3) Now, using a DataAdapter for the table add the DataRow to the
DataSource.
It fails everytime with a message like: "Cannot write null to
non-nullable Column1".
4) If you manually set the DataRow columns (1,2,3) to their default
values, it works every time.
What does that mean? Nothing does not work. Very frustrating.
Please advise.
Bob Day
You cannot test a Boolean, Integer DateTme or any other "Value" type for
Nothing... You must use a reference type if you want to check for Nothing...
A Boolean datatypes initial value, hence the term "Value Type" is False and
Integer is 0 a DataTime is 01/01/0001...
Try this
Dim bol As Boolean
If bol Is Nothing Then
End If
Dim str As String
If str Is Nothing Then
End If
The second test does not produce an error because String is a "Reference
Type"
Does that help....?
"Bob Day" <Bo****@TouchTa lk.net> wrote in message
news:%2******** *******@TK2MSFT NGP10.phx.gbl.. . I really don't understand the distinction you are tyring to make. Below
is the documentation.
It says that dim x as boolean = nothing, then x should have a value of
False, the same as if you did dim x as boolean = false.
In other words, these two sould produce the same value:
1) dim x as boolean = nothing
2) dim x as boolean = false
1 fails, 2 writes to a datasource just fine.
Default, as defined below, is the default of the data type, not <NULL>.
Please help me understand.
Bob
Documentation for help:
The Nothing keyword represents the default value of any data type.
Assigning Nothing to a variable sets it to the default value for its declared type.
If that type contains variable members, they are all set to their default
values. The following example illustrates this:
Public Structure MyStruct
Public Name As String
Public Number As Short
End Structure
Dim S As MyStruct, I As Integer, B As Boolean
S = Nothing ' Sets S.Name to Nothing, S.Number to 0.
I = Nothing ' Sets I to 0.
B = Nothing ' Sets B to False.If the variable is of a reference type -
that is, an object variable - Nothing means the variable is not associated
with any object. For example:
Dim MyObject As Object
MyObject = Nothing ' No object currently referred to.When you assign
Nothing to an object variable, it no longer refers to any object instance.
If the variable had previously referred to an instance, setting it to
Nothing does not terminate the instance itself. The instance is
terminated, and the memory and system resources associated with it are released, only
after the garbage collector detects there are no active references
remaining.
"William Ryan" <do********@nos pam.comcast.net > wrote in message
news:OH******** ******@TK2MSFTN GP10.phx.gbl... Bob, setting the column to nothing does just that, it sets it to the
default value of the object not to the default value that you assigned the
object.
Column1 = nothing
Then try referencing Column1 will give you a null reference exception.
All of those columns are now null, so if you try adding a row with them in
it, you'll get that exception.
The confusion comes from the word Default. Any given column can havea
default value that you assign. The Default value for a Column is
nothing, meaning that you haven't defined it yet.
Try setting Column2 to string.Empty for instance, Column1 to 0 and
column3 to 01/01/0001 and it will work. Also, since you set them to nothing,
they very well may be garbage collected and cease to exist.
HTH,
Bill
"Bob Day" <Bo****@TouchTa lk.net> wrote in message
news:ON******** *****@TK2MSFTNG P10.phx.gbl... VS 2003
The documentation says " Nothing keyword represents the default value
of any data type" this is simply not true and causing a lot of problems.
1) Consider an SQL table of 3 columns:
Column1 bit no nulls
Column2 string no nulls
Column3 DateTime no nulls
2) then, set each column in a DataSet, DataRowto nothing
Column1 = nothing ' should be 0 false
Column2 = nothing ' should be string.empty
Column3 = nothing ' should be 01/01/0001
If you look at the values in DataRow, Column 1,2 & 3 they do not
reflect the defaults, although they all have some value in them (particularly true
with DateTime)
3) Now, using a DataAdapter for the table add the DataRow to the
DataSource.
It fails everytime with a message like: "Cannot write null to
non-nullable Column1".
4) If you manually set the DataRow columns (1,2,3) to their default
values, it works every time.
What does that mean? Nothing does not work. Very frustrating.
Please advise.
Bob Day
Bob:
Look at your the documentation you posted:
' No object currently referred to.When you assign
Nothing to an object variable, it no longer refers to any object instance.>>
Ok, so you have an instance of a column and set it to nothing ..."it no
longer refers to any object instance" If it doesn't refer to any instance
object, then how could you determine its type?
Let me state it more pragmatically.. ..If you want to use the object,
determine it's type, set it's value etc...setting it to nothing will cause
problems.
Now I ask you... Are reference types, ie DataColumns and Value Types
Structs, treated the same when set to nothing? Therein lyes the answer to
your question.
"Bob Day" <Bo****@TouchTa lk.net> wrote in message
news:#$******** *****@TK2MSFTNG P10.phx.gbl... I really don't understand the distinction you are tyring to make. Below
is the documentation.
It says that dim x as boolean = nothing, then x should have a value of
False, the same as if you did dim x as boolean = false.
In other words, these two sould produce the same value:
1) dim x as boolean = nothing
2) dim x as boolean = false
1 fails, 2 writes to a datasource just fine.
Default, as defined below, is the default of the data type, not <NULL>.
Please help me understand.
Bob
Documentation for help:
The Nothing keyword represents the default value of any data type.
Assigning Nothing to a variable sets it to the default value for its declared type.
If that type contains variable members, they are all set to their default
values. The following example illustrates this:
Public Structure MyStruct
Public Name As String
Public Number As Short
End Structure
Dim S As MyStruct, I As Integer, B As Boolean
S = Nothing ' Sets S.Name to Nothing, S.Number to 0.
I = Nothing ' Sets I to 0.
B = Nothing ' Sets B to False.If the variable is of a reference type -
that is, an object variable - Nothing means the variable is not associated
with any object. For example:
Dim MyObject As Object
MyObject = Nothing ' No object currently referred to.When you assign
Nothing to an object variable, it no longer refers to any object instance.
If the variable had previously referred to an instance, setting it to
Nothing does not terminate the instance itself. The instance is
terminated, and the memory and system resources associated with it are released, only
after the garbage collector detects there are no active references
remaining.
"William Ryan" <do********@nos pam.comcast.net > wrote in message
news:OH******** ******@TK2MSFTN GP10.phx.gbl... Bob, setting the column to nothing does just that, it sets it to the
default value of the object not to the default value that you assigned the
object.
Column1 = nothing
Then try referencing Column1 will give you a null reference exception.
All of those columns are now null, so if you try adding a row with them in
it, you'll get that exception.
The confusion comes from the word Default. Any given column can havea
default value that you assign. The Default value for a Column is
nothing, meaning that you haven't defined it yet.
Try setting Column2 to string.Empty for instance, Column1 to 0 and
column3 to 01/01/0001 and it will work. Also, since you set them to nothing,
they very well may be garbage collected and cease to exist.
HTH,
Bill
"Bob Day" <Bo****@TouchTa lk.net> wrote in message
news:ON******** *****@TK2MSFTNG P10.phx.gbl... VS 2003
The documentation says " Nothing keyword represents the default value
of any data type" this is simply not true and causing a lot of problems.
1) Consider an SQL table of 3 columns:
Column1 bit no nulls
Column2 string no nulls
Column3 DateTime no nulls
2) then, set each column in a DataSet, DataRowto nothing
Column1 = nothing ' should be 0 false
Column2 = nothing ' should be string.empty
Column3 = nothing ' should be 01/01/0001
If you look at the values in DataRow, Column 1,2 & 3 they do not
reflect the defaults, although they all have some value in them (particularly true
with DateTime)
3) Now, using a DataAdapter for the table add the DataRow to the
DataSource.
It fails everytime with a message like: "Cannot write null to
non-nullable Column1".
4) If you manually set the DataRow columns (1,2,3) to their default
values, it works every time.
What does that mean? Nothing does not work. Very frustrating.
Please advise.
Bob Day
Bob: The whole distinction, is this...are DataColumns Reference types or
Value Types? What type is a Struct that you make mention of?
"William Ryan" <do********@nos pam.comcast.net > wrote in message
news:OH******** ******@TK2MSFTN GP10.phx.gbl... Bob, setting the column to nothing does just that, it sets it to the
default value of the object not to the default value that you assigned the object.
Column1 = nothing
Then try referencing Column1 will give you a null reference exception.
All of those columns are now null, so if you try adding a row with them in it,
you'll get that exception.
The confusion comes from the word Default. Any given column can havea
default value that you assign. The Default value for a Column is nothing,
meaning that you haven't defined it yet.
Try setting Column2 to string.Empty for instance, Column1 to 0 and column3
to 01/01/0001 and it will work. Also, since you set them to nothing, they
very well may be garbage collected and cease to exist.
HTH,
Bill
"Bob Day" <Bo****@TouchTa lk.net> wrote in message
news:ON******** *****@TK2MSFTNG P10.phx.gbl... VS 2003
The documentation says " Nothing keyword represents the default value of
any data type" this is simply not true and causing a lot of problems.
1) Consider an SQL table of 3 columns:
Column1 bit no nulls
Column2 string no nulls
Column3 DateTime no nulls
2) then, set each column in a DataSet, DataRowto nothing
Column1 = nothing ' should be 0 false
Column2 = nothing ' should be string.empty
Column3 = nothing ' should be 01/01/0001
If you look at the values in DataRow, Column 1,2 & 3 they do not reflect
the defaults, although they all have some value in them (particularly true
with DateTime)
3) Now, using a DataAdapter for the table add the DataRow to the
DataSource.
It fails everytime with a message like: "Cannot write null to
non-nullable Column1".
4) If you manually set the DataRow columns (1,2,3) to their default
values, it works every time.
What does that mean? Nothing does not work. Very frustrating.
Please advise.
Bob Day
Amen:
Since it's a reference type, it needs to be treated as one. Structs, Enums
etc are value types. DataColumns are reference types.
"alien2_51" <da********@n.o .s.p.a.m.monaco coach.com> wrote in message
news:es******** ******@TK2MSFTN GP09.phx.gbl... You cannot test a Boolean, Integer DateTme or any other "Value" type for
Nothing... You must use a reference type if you want to check for
Nothing... A Boolean datatypes initial value, hence the term "Value Type" is False
and Integer is 0 a DataTime is 01/01/0001...
Try this
Dim bol As Boolean
If bol Is Nothing Then
End If
Dim str As String
If str Is Nothing Then
End If
The second test does not produce an error because String is a "Reference
Type"
Does that help....?
"Bob Day" <Bo****@TouchTa lk.net> wrote in message
news:%2******** *******@TK2MSFT NGP10.phx.gbl.. . I really don't understand the distinction you are tyring to make. Below is the documentation.
It says that dim x as boolean = nothing, then x should have a value of
False, the same as if you did dim x as boolean = false.
In other words, these two sould produce the same value:
1) dim x as boolean = nothing
2) dim x as boolean = false
1 fails, 2 writes to a datasource just fine.
Default, as defined below, is the default of the data type, not <NULL>.
Please help me understand.
Bob
Documentation for help:
The Nothing keyword represents the default value of any data type.
Assigning Nothing to a variable sets it to the default value for its declared
type. If that type contains variable members, they are all set to their default
values. The following example illustrates this:
Public Structure MyStruct
Public Name As String
Public Number As Short
End Structure
Dim S As MyStruct, I As Integer, B As Boolean
S = Nothing ' Sets S.Name to Nothing, S.Number to 0.
I = Nothing ' Sets I to 0.
B = Nothing ' Sets B to False.If the variable is of a reference type -
that is, an object variable - Nothing means the variable is not
associated with any object. For example:
Dim MyObject As Object
MyObject = Nothing ' No object currently referred to.When you assign
Nothing to an object variable, it no longer refers to any object
instance. If the variable had previously referred to an instance, setting it to
Nothing does not terminate the instance itself. The instance is terminated, and the memory and system resources associated with it are released,
only after the garbage collector detects there are no active references
remaining.
"William Ryan" <do********@nos pam.comcast.net > wrote in message
news:OH******** ******@TK2MSFTN GP10.phx.gbl... Bob, setting the column to nothing does just that, it sets it to the
default value of the object not to the default value that you assigned the
object.
Column1 = nothing
Then try referencing Column1 will give you a null reference exception.
All of those columns are now null, so if you try adding a row with them in it, you'll get that exception.
The confusion comes from the word Default. Any given column can havea
default value that you assign. The Default value for a Column is nothing, meaning that you haven't defined it yet.
Try setting Column2 to string.Empty for instance, Column1 to 0 and column3 to 01/01/0001 and it will work. Also, since you set them to nothing, they very well may be garbage collected and cease to exist.
HTH,
Bill
"Bob Day" <Bo****@TouchTa lk.net> wrote in message
news:ON******** *****@TK2MSFTNG P10.phx.gbl...
> VS 2003
>
> The documentation says " Nothing keyword represents the default
value of any
> data type" this is simply not true and causing a lot of problems.
>
> 1) Consider an SQL table of 3 columns:
>
> Column1 bit no nulls
> Column2 string no nulls
> Column3 DateTime no nulls
>
> 2) then, set each column in a DataSet, DataRowto nothing
> Column1 = nothing ' should be 0 false
> Column2 = nothing ' should be string.empty
> Column3 = nothing ' should be 01/01/0001
> If you look at the values in DataRow, Column 1,2 & 3 they do not reflect the
> defaults, although they all have some value in them (particularly
true with
> DateTime)
>
> 3) Now, using a DataAdapter for the table add the DataRow to the
DataSource.
>
> It fails everytime with a message like: "Cannot write null to
non-nullable > Column1".
>
> 4) If you manually set the DataRow columns (1,2,3) to their default
values,
> it works every time.
>
> What does that mean? Nothing does not work. Very frustrating.
>
> Please advise.
>
> Bob Day
>
>
>
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