Here's a bit of code
Private Sub QhBindingNavigatorSaveItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles QhBindingNavigatorSaveItem.Click
Me.Validate()
[Code]......
I am retrieving a database object and trying to set the values of the object's fields to various textboxes in my vb.net page
View 3 RepliesI was thinking I should just change the value to "" when a null value has been read from the datasoure. But then I thought maybe there is a property that allows this. is there?
txtComments.DataBindings.Add("Text", rowEquipItem, "Comment")
I need to search a buffer for a string of characters.The buffer is essentially a binary file (it's an image) and contains lots of chr(0) characters.The string I need to locate also contains chr(0) characters. In fact it is the following string:
chr(100) & chr(0) & chr(0) & chr(163)
This is a marker in the image file for items I need to process.So I though I would do the following:
Dim sFileBuffer as String = system.io.file.readalltext("myimagefile")
Dim sLookFor as String = chr(100) & chr(0) & chr(0) & chr(163)
Dim iLocation as Integer = sFileBuffer.IndexOf(sLookFor)
The problem is that, although the characters in sLookFor definitely exist inside of sFileBuffer - IndexOf will always return -1 (not found).I tried the following:
Dim Marker() as Byte = {100, 0, 0 , 163}
Dim sLookFor as String = System.Text.Encoding.UTF8.GetString(Marker)
Dim sFileBuffer as String = system.io.file.readalltext("myimagefile", Encoding.UTF8)
Dim iLocation as Integer = sFileBuffer.IndexOf(sLookFor)
But this appears to only find occurrences of Chr(100) & Chr(0) - not the full 4 character sequence I desire. It appears to see the second Chr(0) as a termination of the search string.I think the sticking point here is the null. Yes - I can string.replace(chr(0), Chr(255)) in both the sLookFor and the sFileBuffer and adjust my search accordingly - but that seems like a mess to me.Is there not a way to search a buffer of binary data? I've tried working with byte arrays - but there appears to be no way to easily search for a sequence of byte values - just individual elements in the array.
I am getting null values in Environment, ApplicationName, ApplicationPath, ExceptionData when inserting rows in a SQL Server 2005 DB. My log4net configuration is as follows :
<log4net>
<appender name="ADONetAppender_SqlServer" type="log4net.Appender.AdoNetAppender">
<bufferSize value="1" />
[code].....
How to allow the user to select the date from the DateTimePicker and store that selected date ,month and year in the database table?
View 3 RepliesI want to get date from database to my datetimepicker, but I got problem
here is my code.
Dim sStatement As String
sStatement = "SELECT Transactions.RentDate " & _
"FROM Transactions INNER JOIN TransactionsDetails ON Transactions.[TransactionID]
[Code]...
No data exists for the row/column. But I have many data... and the second time i click the button
The connection was not closed. The connection's current state is open.
Let's say I have a MySql stored procedure that inserts a record with some nullable CHAR fields. In VB.NET if I don't check for Nothing (or Null in other languages), I get an exception from the db driver, so I write:
command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddWithValue("_name", if(name Is Nothing, "", name)).Direction = ParameterDirection.Input;
And this is the first thing I don't like; I'd like to pass Nothing and the driver knows it has to put NULL in the Db. But then, in the stored procedure, I have to check back the field if it is empty:
INSERT INTO mytable
(name, -- other 200 char fields)
VALUES
(NULLIF(_name, ''),
-- other 200 char fields
)
I have to check for nothingness/emptiness twice. Is there a better, more direct, way? Even worse, for non reference types (i.e: Integers) the check for nothingness makes no sense, since a primitive type can't be nothing (yes, I could set an Integer to a non meaningful value, say -1 for a positive id, but...).
Is there an easier way to do this?
The .ColorReportedDate, .ColorTypeKey, .IsColorKeyNull, etc are from my strongly typed dataset row.
If .IsColorKeyNull Then
.ColorReportedDate = Now()
ElseIf cboColorType.SelectedValue <> .ColorTypeKey Then
.ColorReportedDate = Now()
End If
How to allow the user to select the date from the DateTimePicker and store that selected date month and year in the database table?
View 3 Repliesi can't get DateTimePicker to insert into Access databse. I've tried all the suggestion i can find from this forum, so i'm thinking my problem is different?my table has a column date which has a Date/Time format
my code
Dim cmd As OleDbCommand
Dim sqlstr As String, ans As Boolean
Dim mydate As DateTime
mydate = Me.dtPickerT.Value
[Code]...
Using VB.NET I want to display the date in datetimepicker from the database.
Code.
cmd= new sqlcommand("select date from table1", con)
dr = cmd.executereader
while dr.read()
[code]....
But it showing error as specified cast is not valid How to get a value?
how to save nul Value of DateTimePicker in the Database note: i make dtp become null value like this
dtp.customformate=" " single space and the code to bind
dtp.DataBindings.Clear()
dtp.DataBindings.Add(New System.Windows.Forms.Binding("value", Me.GetAllCrimeDataBindingSource, "Date", True))
My problem is when I try adding a new appointment I get an error that says ""Column 'AppID' does not allow nulls."" Editing existing appointments is fine and it updates the DB no problem. I don't have an INSERT statement right now (which might be the issue) so I was thinking of doing this: INSERT INTO [tablename] ( [column1], [column2], ... ) VALUES ( [value1], [value2], ...) Only problem with that is I would need to use the textbox names for the VALUES, and that form that pops up to gather appointment info is from a third party, and I can't find the names of any text boxes
View 2 RepliesI've written the following code to add a new record to a database:
Public Shared Sub AddTopicUser(ByVal UserID As Integer, ByVal TopicCode As String)
Dim RowsAffected As Integer
Dim ATUDCONN As New OleDbConnection
ATUDCONN.ConnectionString = DBCONNSTR
Dim ATUDCMD As New OleDbCommand("INSERT INTO tblSubscriptions (UserID, TopicCode, Completed) Values (@UserID, @TopicCode, @Completed)", ATUDCONN)
[Code]...
I recieve no errors from the code, but when i open the database after - the record has not been added.
I have checked that the values being passed as parameters to the function are valid. I was curious as to whether I was formatting the OleDbCmd correctly, which is why i added a message box function to show be the value of the connection string which at runtime is: when they're not being added to the db?
I am having problems with inserting into my sql database my program is as follows:[code]So when I enter my data, into my program, it goes perfectly until it gets to "dim num as integer = cmd.ExecuteNonQuery" and then it comes up with an error saying "Syntax error in INSERT INTO statement.".i am also doing an update function which is pretty much exactly like this, except for the sql command of course, and that works perfectly with this code.[code]I have noted that instead of"replace" it should be "insert" but am now getting another error where it says "Conversion from string "#PlayerNo#" to type 'Integer' is not valid."
View 5 RepliesSo I have the following that seems to work fine in MS SQL Server management Studio and seems (but isn't) to be working as its doing a re-direct to another page after the insertion of data...Basically, I pull in all the data from the text boxes and hidden fields, convert that info to strings and do my insert statement. Now in MS SQL SMS The following insert statement works:
insert into [Contacts].[dbo].[contactInformation] values ('Adam', 'john', '16', '' , '' , 'm', '', '');
You can tell from the above which are allowed and which are not allowed to be null. any ways. Why is this not inserting data into my database? is it because of
cmd.CommandText = SqlDataSourceCommandType.Text
i am using Visual Studio 2008 and VB.NET 2008 and SQL Server 2005 as the database. I just finished designing & writing codes for a customer information and , however after it has been connected to the database only one of the datetimepicker can be click, and the rest of the function including in the form are not working!it seem that the form stuck and NOT responding. i cant even close the form (X button), so i have to stop the process using compiler (visual studio 2008), however if i press the 'Delete' button before the 'Add' button, it will successfully delete the data.. but if i disconnected the form from the database, (disabled the form_load codes [put 'quote']) the both of datetimepicker will work and able to view the date interval (after pressing the 'Calculate Period' button) in addition how to make it appear automatically in screen without using the button? below are the code, I try to make some other form.. but it is still the same
Code:
Imports System.Data.SqlClient
Imports System
Imports System.Data[code].....
I have an accounts program. My cash book shows data based on date picked from DateTimePicker. Cash book is not entered everyday. I want to make my datetimepicker so that based on dates found in the database, it changes colour or enable / disable some dates, for which cash book has been entered. How is it possible?
View 6 RepliesI am trying to add a record into the database wothout much success. sometimes it works and sometimes it returns error "overflow exception unhandled".And even the database is not all the time updated. How do you add the Datatimepicker value into the database...?[code]I'm using VS 2008 and MsAccess as my database connected through the database connection wizard
View 2 RepliesHow to use a DateTimePicker to query a database table. Basically, when a day is chosen on the DateTimePicker, I want all the database entries for that day to be populated on Datagridview. My Datetimepicker name is datetimepicker1. The datagridview name is dgv. The database table is called QCAuditing and the row in the database, that has timedate, which I want to use for query is called date. I was wondering if someone can point me to the right direction here.
View 1 RepliesI have an issue with date format in my SSRS. I am saving date from DateTimePicker to database. From there I am taking display in my datagridview using following
dgv.items(0,2).value=Format(Cdate(dsSaver.tblInv.rows(0).items(0)),"dd-MMM-yyyy")
This displays it correctly (04-Nov-2011) but when I take date from the same database to my SSRS using
="Dated: " &Format(cdate(Fields!InvDate.Value),"dd-MMM-yyyy")
It displays it like 11-Apr-2011.
I have tested all winforms fare displaying it right but all SSRS are displaying it wrong.
OK, before I throw my laptop out the window... I need to insert data into my Access Database from my VB.Net2005 application. I have written and re-written this code, trying everything I can find from the web and I've had no luck. I'm getting a {"Data type mismatch in criteria expression."} error on the ExecuteNonQuery line - I'm fairly certain that it's the DateTimePickers, as I rem them out and the code works fine. However, I've tried everything - changed the column in my database to Text, changed the .Value to .Text, .Value.ToLongDateString, and every time I'm getting the same error. One of the things I read on line was that I need to use parameters in order to pass the DateTime - I need to pass the Date and Time (date format is not important, but I require the hh:mm:ss format for the time). The fields currently default to the current date/time which is perfect, but I read that depending on how you pass the data, you may run into problems if the user does not pick the drop box (leaving it as the default).
[Code].....
I'm trying to insert data into a MS SQL database from a vb application. When i enter in some dummy data at runtime, this is the error i get "Invalid column name 'ahfh'. Invalid column name 'dsfhdf'. Invalid column name 'sdfhdf'." The error occurs at this line - "myCommand.ExecuteNonQuery()"
Protected
Sub Button1_Click(ByVal
sender As
Object,
[code].....
Iam developing bank application in vb.net 2008. Back end is ms access. I want to insert customer details into two databases.I 'm included connection string as seperate module customer database
Module Module1
Public Const cnstring As String = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source= D:\Bank Project\customer.mdb"
[Code].....
I'm getting error in rs1.open(select *...) line as 'could not use File already in use'
I am using an SQL local database to store my data. I can connect to it, but i cannot write any data to it. I get no errors when i execute my code, but when i view the database it is still empty. I have working on this for about 12 hours, I have imported System.Data and System.Data.SqlClient
[Code]...
how to insert the images in database using vb.net.both using web cam and scaned photo
View 1 Repliesi have sql server 2005 for my database, and asp.net and vb.net for my web application.
i have one web form that is used to insert data in to my table.
[Code]...
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you see that there is html tag that is <br/> for new line. now that data successfuly added into my table, there problem is when the data is display using datagrid or datalist, the html tag that is <br/> also displayed as it is. how do i make to it its normal function?
I typically dont use a dataset in a case of new data insertion to the database. But then again, I will run in a problem the weather the inserting data already exsit in the database. Therefore i need to perform a search first. However, if i follow this it will take slow down the application (if the table has 1 million records). One way i could optmimize this is to load the whole table in to a dataset then the application doesnt have to go to a back end trip nwo it can search inthe dataset. Is this the standard way for inserting records?
View 3 Replieshaving a bit of trouble with inserting records into my database. I have the following code:
Dim mypath As String = Application.StartupPath & "\Data\Contacts.mdb"
Dim mypassword As String = ""
Dim inc As Integer
[Code]......