Using ASP.net 1.1
2 QUESTIONS:
1. Why do my write commands not work?
2. This file successfully makes changes in the database record. There
surely is some simple code I could add that would *add* records to this
database. Who can tell me?
<%@ Page Language="VB" Debug="true" %>
<%@ Import Namespace="Syst em.Data.Oledb" %>
<script runat="server">
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArg s)
Dim DBConnection As OledbConnection
DBConnection = New OledbConnection ("Provider=Micr osoft.Jet.Oledb .4.0;" & _
"Data Source=C:\Inetp ub\wwwroot\app_ data\Acc.mdb" )
DBConnection.Op en()
Dim DBCommand As OledbCommand
DBCommand = New OledbCommand("S ELECT * FROM table1, Acc")
Dim SQLString AS String
SQLString = "UPDATE Table1 SET TheEmpName='POO OOO' WHERE TheDate='6/14/07'"
DBCommand = New OleDBCommand(SQ LString, DBConnection)
DBCommand.Execu teNonquery()
Dim DBReader AS OledbDatareader
DBReader = DBCommand.Execu teReader()
While DBReader.Read()
Response.Write( DBReader("TheDa te"))
Response.Write( DBReader("TheEm pName"))
End while
' MyDataGrid.Data Source = DBReader
'MyDataGrid.Dat aBind()
DBReader.Close( )
DBConnection.Cl ose()
End Sub
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:DataGrid id="MyDataGrid " runat="server"/>
</form>
</body>
</html> 14  1612 
"dancer" <da****@microso ft.comwrote in message
news:uo******** *****@TK2MSFTNG P05.phx.gbl...
Using ASP.net 1.1
2 QUESTIONS:
1. Why do my write commands not work?
2. This file successfully makes changes in the database record. There
surely is some simple code I could add that would *add* records to this
database. Who can tell me?
Well, firstly if you're able to edit existing records, at least *some* of
your write commands are working... :-)
1) What code are you actually using to add records to the database? I see an
UPDATE SQL statement for updating existing records - where is your
corresponding INSERT statement for adding new records...?
2) What errors are you getting back from your database?
--
Mark Rae
ASP.NET MVP http://www.markrae.net
RE:1) What code are you actually using to add records to the database? I
see an
UPDATE SQL statement for updating existing records - where is your
corresponding INSERT statement for adding new records...?
I am not using any code to add records. That was my question: What code can
I add to add records?
RE: 2) What errors are you getting back from your database?
None.
My code does exactly what it's intended to do: updates a record according to
a criteria. The only part that does not work are these two lines:
Response.Write( DBReader("TheDa te"))
Response.Write( DBReader("TheEm pName"))
That's what I meant by "why does it not write?" I wanted to SEE if it
updates the record without having to look at the database, therefore I
included those lines, but they do not "write" so that I can see the updated
field.
Thank you.
"Mark Rae [MVP]" <ma**@markNOSPA Mrae.netwrote in message
news:eL******** ******@TK2MSFTN GP05.phx.gbl...
"dancer" <da****@microso ft.comwrote in message
news:uo******** *****@TK2MSFTNG P05.phx.gbl...
>Using ASP.net 1.1
2 QUESTIONS:
1. Why do my write commands not work?
2. This file successfully makes changes in the database record. There
surely is some simple code I could add that would *add* records to this
database. Who can tell me?
Well, firstly if you're able to edit existing records, at least *some* of
your write commands are working... :-)
1) What code are you actually using to add records to the database? I see
an UPDATE SQL statement for updating existing records - where is your
corresponding INSERT statement for adding new records...?
2) What errors are you getting back from your database?
--
Mark Rae
ASP.NET MVP
http://www.markrae.net
"dancer" <da****@microso ft.comwrote in message
news:em******** ******@TK2MSFTN GP04.phx.gbl...
>RE:1) What code are you actually using to add records to the database?
I see an UPDATE SQL statement for updating existing records - where is
your corresponding INSERT statement for adding new records...?
I am not using any code to add records. That was my question: What code
can I add to add records?
Oh right...
The SQL syntax to add a record into a table in a Jet database is:
INSERT INTO Table (field1, Field2...) VALUES (Value1, Value2...)
RE: 2) What errors are you getting back from your database?
None.
My code does exactly what it's intended to do: updates a record according
to a criterion. The only part that does not work are these two lines:
Response.Write( DBReader("TheDa te"))
Response.Write( DBReader("TheEm pName"))
That's what I meant by "why does it not write?" I wanted to SEE if it
updates the record without having to look at the database, therefore I
included those lines, but they do not "write" so that I can see the
updated field.
You're issuing your UPDATE statement correctly but, if you want to see that
it has worked, you will then need to issue a SELECT statement to fetch the
record you've just updated back out of the database...
--
Mark Rae
ASP.NET MVP http://www.markrae.net
Thank you for helping me, Mark.
The INSERT INTO code works great as long as I'm inserting literals. For
example,
SQLString = "INSERT INTO Table1(TheEmpNa me, TheDate,
TheNotifyDate)V ALUES(""Somebod y"", ""10/10/98"", ""10/11/98"")"
But I need to insert variables received form an input form. When I put the
variable names in place of the literals like this:
SQLString = "INSERT INTO Table1(TheEmpNa me, TheDate,
TheNotifyDate)V ALUES(EmpName, DateOfAccident, NotifyDate)"
I get this error message:
No value given for one or more required parameters
What is the syntax for using variables as the values?
"Mark Rae [MVP]" <ma**@markNOSPA Mrae.netwrote in message
news:es******** *****@TK2MSFTNG P04.phx.gbl...
"dancer" <da****@microso ft.comwrote in message
news:em******** ******@TK2MSFTN GP04.phx.gbl...
>>RE:1) What code are you actually using to add records to the database?
I see an UPDATE SQL statement for updating existing records - where is
your corresponding INSERT statement for adding new records...?
I am not using any code to add records. That was my question: What code
can I add to add records?
Oh right...
The SQL syntax to add a record into a table in a Jet database is:
INSERT INTO Table (field1, Field2...) VALUES (Value1, Value2...)
>RE: 2) What errors are you getting back from your database?
None.
My code does exactly what it's intended to do: updates a record according
to a criterion. The only part that does not work are these two lines:
Response.Write (DBReader("TheD ate"))
Response.Write (DBReader("TheE mpName"))
That's what I meant by "why does it not write?" I wanted to SEE if it
updates the record without having to look at the database, therefore I
included those lines, but they do not "write" so that I can see the
updated field.
You're issuing your UPDATE statement correctly but, if you want to see
that it has worked, you will then need to issue a SELECT statement to
fetch the record you've just updated back out of the database...
--
Mark Rae
ASP.NET MVP
http://www.markrae.net
"dancer" <da****@microso ft.comwrote in message
news:eC******** ******@TK2MSFTN GP02.phx.gbl...
Thank you for helping me, Mark.
The INSERT INTO code works great as long as I'm inserting literals. For
example,
SQLString = "INSERT INTO Table1(TheEmpNa me, TheDate,
TheNotifyDate)V ALUES(""Somebod y"", ""10/10/98"", ""10/11/98"")"
But I need to insert variables received form an input form. When I put
the variable names in place of the literals like this:
SQLString = "INSERT INTO Table1(TheEmpNa me, TheDate,
TheNotifyDate)V ALUES(EmpName, DateOfAccident, NotifyDate)"
I get this error message:
No value given for one or more required parameters
What is the syntax for using variables as the values?
An SQL statement is a string like any other string, so you concatenate your
variables in the usual way:
SQLString = "INSERT INTO Table1(TheEmpNa me, TheDate, TheNotifyDate)V ALUES('"
+ EmpName + "' etc...
However, this is an extremely dangerous practice, especially in a web
application, because of something called SQL Injection, but maybe that's
another story for another day...
--
Mark Rae
ASP.NET MVP http://www.markrae.net
Hi Mark,
Can you tell me why I get a new record, but with nothing in it, even though
I get a form and fill it in and click submit?
Here's the code:
<%@ Page Language="VB" Debug="true" %>
<%@ Import Namespace="Syst em.Data.Oledb" %>
<script language= "VB" runat="server">
'Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArg s)
Sub btnSendDatabase _OnClick(Source As Object, E As EventArgs)
Dim DBConnection As OledbConnection
DBConnection = New OledbConnection ("Provider=Micr osoft.Jet.Oledb .4.0;" & _
"Data Source=C:\Inetp ub\wwwroot\Acc. mdb" )
DBConnection.Op en()
Dim DBCommand As OledbCommand
DBCommand = New OledbCommand("S ELECT * FROM table1, Acc")
Dim SQLString AS String
Dim EmpName as String
Dim DateOfAccident as string
Dim NotifyDate as string
SQLString = "INSERT INTO Table1(TheEmpNa me, TheDate,
TheNotifyDate)V ALUES('"+EmpNam e+"','"+DateOfA ccident+"','"+N otifyDate+"')"
DBCommand = New OleDBCommand(SQ LString, DBConnection)
DBCommand.Execu teNonquery()
DBConnection.Cl ose()
End Sub
</script>
</head>
<body>
<form id="form1" runat="server">
Employee's Name: <asp:textbox id="EmpName" runat=server columns="45"/>
<asp:textbox id="DateofAccid ent" runat=server /></asp:textbox>
<font face="Verdana" Size="2">Date Employer Notified <asp:textbox
id="Notifydate " runat=server/>
<asp:Button id="btnSendData base" text="Submit"
OnClick="btnSen dDatabase_OnCli ck" runat="server" />
</form>
</body>
</html>
"Mark Rae [MVP]" <ma**@markNOSPA Mrae.netwrote in message
news:eL******** ******@TK2MSFTN GP02.phx.gbl...
"dancer" <da****@microso ft.comwrote in message
news:eC******** ******@TK2MSFTN GP02.phx.gbl...
"dancer" <da****@microso ft.comwrote in message
news:eZ******** ******@TK2MSFTN GP02.phx.gbl...
Can you tell me why I get a new record, but with nothing in it, even
though I get a form and fill it in and click submit?
A couple of things...
Firstly:
Dim DBCommand As OledbCommand
DBCommand = New OledbCommand("S ELECT * FROM table1, Acc")
You're instantiating an OleDbCommand object, but never actually using it
before re-instantiating it further down in the code...
Secondly:
Dim SQLString AS String
Dim EmpName as String
Dim DateOfAccident as string
Dim NotifyDate as string
SQLString = "INSERT INTO Table1(TheEmpNa me, TheDate,
TheNotifyDate)V ALUES('"+EmpNam e+"','"+DateOfA ccident+"','"+N otifyDate+"')"
DBCommand = New OleDBCommand(SQ LString, DBConnection)
DBCommand.Execu teNonquery()
DBConnection.Cl ose()
You're not actually populating the three data variables - therefore, you're
inserting a record into your table where all the fields are blank...
Dim EmpName as String = EmpName.Text
Dim DateOfAccident as string = DateOfAccident. Text
Dim NotifyDate as string = NotifyDate.Text
--
Mark Rae
ASP.NET MVP http://www.markrae.net
"Mark Rae [MVP]" <ma**@markNOSPA Mrae.netwrote in message
news:Og******** ******@TK2MSFTN GP06.phx.gbl...
Dim EmpName as String = EmpName.Text
Dim DateOfAccident as string = DateOfAccident. Text
Dim NotifyDate as string = NotifyDate.Text
Actually, that might cause errors because the string variables have the same
names as the webcontrols...
Dim SQLString AS String
Dim strEmpName As String = EmpName.Text
Dim strDateOfAccide nt As String = DateOfAccident. Text
Dim strNotifyDate As String = NotifyDate.Text
SQLString = "INSERT INTO Table1(TheEmpNa me, TheDate,
TheNotifyDate)V ALUES('"+ strEmpName+"',' "+ strDateOfAccide nt+"','"+
strNotifyDate+" ')"
--
Mark Rae
ASP.NET MVP http://www.markrae.net
ok It's working now. Thanks
Now - other question - I have 47 fields. Do I have to code '"+field1+"' ,
etc. 47 TIMES?!!
Is there not a way to say INSERT INTO Table 1 [all] VALUE [all] in some
form?
SURELY there is a way.
Also, I have seen
With Cmd Parameters
.Add(New OleDbParameter( "@field1",
frmfield1.text) )
etc.
What is the difference in that and INSERT?
Thank you.
"Mark Rae [MVP]" <ma**@markNOSPA Mrae.netwrote in message
news:Og******** ******@TK2MSFTN GP06.phx.gbl...
"dancer" <da****@microso ft.comwrote in message
news:eZ******** ******@TK2MSFTN GP02.phx.gbl...
>Can you tell me why I get a new record, but with nothing in it, even
though I get a form and fill it in and click submit?
A couple of things...
Firstly:
>Dim DBCommand As OledbCommand
DBCommand = New OledbCommand("S ELECT * FROM table1, Acc")
You're instantiating an OleDbCommand object, but never actually using it
before re-instantiating it further down in the code...
Secondly:
>Dim SQLString AS String
Dim EmpName as String
Dim DateOfAccident as string
Dim NotifyDate as string
SQLString = "INSERT INTO Table1(TheEmpNa me, TheDate,
TheNotifyDate) VALUES('"+EmpNa me+"','"+DateOf Accident+"','"+ NotifyDate+"')"
DBCommand = New OleDBCommand(SQ LString, DBConnection)
DBCommand.Exec uteNonquery()
DBConnection.C lose()
You're not actually populating the three data variables - therefore,
you're inserting a record into your table where all the fields are
blank...
Dim EmpName as String = EmpName.Text
Dim DateOfAccident as string = DateOfAccident. Text
Dim NotifyDate as string = NotifyDate.Text
--
Mark Rae
ASP.NET MVP
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