I'm trying to insert information from a form to an Access database. I get the error: Object reference not set to an instance of an object. It points the line: dsWHNewRow = WHds.Tables("WeightHeight").NewRow() in the btnAdd_Click Sub. I'm sure I'm missing something but don't know what to look for.
Public Class WeightHeightPopup
Dim WHcon As New OleDb.OleDbConnection
Dim dbWHProvider As String[code].......
I'm trying to add information to a SQL database. I've had trouble getting it to update (and I'm only doing one entry at a time!). However, even one at a time gives me trouble. The red line of code gives me this error: Update requires a valid InsertCommand when passed DataRow collection with new rows. what I'm doing wrong--I think it may be syntax, but I'm think the parameters are correct.
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Okay, I've made a local database now and everything is okay. But I don't want the normal data grid view, I want to display the information in a list view. How can I do that? Do I have to make some sql queries or something?
View 8 RepliesThe program is currently trying to pull information from three different database tables and compiling the information onto one screen, to do this i am using three different connections and a function to handle the data at each stage. The issue is as my code hits PageLoadStage of "2" and runs the QueryDatabase() Function i am encountering an error of: "OleDB exception unhandled: No value given for one or more of the required parameters." This occurs on line 15 of the first code snippet. Can anyone explain this and/or identify any code issues if that is the cause.
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How i can insert information from the Row in datagridview into textboxes?now i made an access db then i made 7 textboxes to add information in my db no how i can reverse this action :
that i select any row to show the information every thing in his text box ?
txtMsg.Text = "Message from " & e.MSISDN & " . Message - " & e.TextMessage &ControlChars.CrLfand i want to change it to insert into a listview instead.Eg inserting the e.MSISDN information into a FROM column of the listview.
View 2 Repliescould someone tell me what i am doing wrong in this codeProtected Sub insert_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Insert.Click
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Visual Studio 2008VB.NETFramework 3.5Windows Application
I have a SQL database names TestSQLVB
In it a table called tblTest2, with a three fieldstest2id , int, pk, increment by 1field1, varchar(50)field2, varchar(50)
I have a dataset named Dataset2.xsd
A tableadapter named tblTest2TableAdapter
A insert query names InsertTest2 with fields @f1, @f2 and ExecuteMode = Scalar
When I run the following code per MSDN [URL] the database does not get updated.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim testds As New DataSet2TableAdapters.tbltest2TableAdaptertestds.InsertTest2("One", "Dog")
End Sub
im in the middle of doing sql queries i can search my data base usingGetDateFrom (Select, from, where) Me.nameTableAdapter.FillBy(namenDataSet.descip, Me.box1TextBox.Text,Me.box1TextBox.Text, Me.box2TextBox.Text, Me.box2TextBox.Text)i have this working fine im struggling with inderting data to my databse i have made the query ..
INSERT INTO `details` (`Forename`, `Surname`, `Username`, `Password`)
VALUES (''& ForenameTextBox.Text &'', ''& SunameTextBox.Text &'', ''& UsernameTextBox &'', ''& PasswordTextBox &'')
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why my insert doesn't insert into mysql database
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here is my code so far:
Public Sub cmdSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdSave.Click
Dim i As Integer
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when i click the button, i get a error message saying "Syntax error in INSERT INTO statement". as far as i can tell, i have everything i need to insert a new row into the database, and i dont see why this problem is occuring.
item(0) is an autonumber key field, so that should make a new record by itself, and i have declared the input textboxes as the data() array
I created a dataset and i am using OleDbDataAdapter to insert new values to access database. But when i close the program and after open it, values are not in the database. How can i solve this problem? Also, i have another problem. When i write codes that
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I'm using a OleDB connection to a access database. I'm entering a row into the database to set some user preferences. What i need to get is get back the row ID of the row I just entered. I'm more familiar with PHP and with PHP I use use this entry
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I am trying to get an Email and password from a database and use them as a log in (not acces database) i tryed rdr = mycommand.ExcuteReader but that dosent work [code]...
View 2 RepliesIs there an external gadget that i can use say a phone or any other to get information from my database?
View 4 RepliesI want to get information from database and then i want to assign this information to label's text or textbox. I wrote sql codes and i used OleDbDataAdapter.
SELECT soruno, soru, cevap1, cevap2, cevap3, cevap4
FROM quiz
WHERE (soruno = ?)
Then i wrote codes that OleDbDataAdapter1.SelectCommand.Parameters.Add("soruno", OleDb.OleDbType.Integer).Value = 3
I am currently writing a VB .NET application where I am trying to open 1 database, create a select statement and then post the results into another database file using Microsoft Access database 2003.
The code seems to stop executing at the statement cmdJetDB.ExecuteNonQuery()
I am using the following code:
Dim conn1 As OleDbConnection = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data source=C:Sample.mdb")
Dim conn2 As OleDbConnection = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data source=C:db2.mdb")
conn1.Open()
conn2.Open()
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Question: What is it that I am not doing. I opened both connections, stated my two SQL statements, yet it is still not working. I really need to get this application working. Please Help.........
I need save some informations, in a table (date, hour, number of points...) I use Vb .NET 2008.
View 5 RepliesI have a database with about 10 records - each with their own ID. I'm trying to add a new record, and to do this I decided to have a text box on my application form show what the next ID will be. Here's the code I am using:
Private Sub btnAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAdd.Click
'get EmployeeID from the textbox:
Dim intEmployeeID As Int16 = Val(txtEmployeeID.Text) + 1
'store the emlpoyee
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The changes you requested to the table were not successful because they would create duplicate values in the index, primary key, or relationship. Change the data in the field or fields that contain duplicate data, remove the index, or redefine the index to permit duplicate entries and try again.How would I go about finding the maximum ID in the database and then adding 1 to it so I can display it in the text box?
does anyone know how to make it that when you type something in to a text box the click a button called add to then have what you typed in added to a checked list box and then have it that when you click another button called add that the information in the checked list box which has been checked is then added to a database.would it be better to make th information entered in to the text box be saved to a text document and then have the checked box get its information from the text file if so does any one know how to do that.
View 3 RepliesI want to retreive customer information from microsoft sql server database using just his/her user id onto a web form.
View 1 RepliesI am working on login and registration page in vb express 2010. I have connected access 2007 database with my project and when I register as a user, it stores information to the database successfully and I can log in with that id as well. But when I close that project and reopen it, the same exact id won't work and the information in the database disappears.
View 1 RepliesI'm working with the project that require save all user personal information in one table when they login the my system. The problem is too many users login my system per day, it's very hard to manage. So, I want to add one more function which can specify one user information. My solution is filter that user and copy to other table, the problem is I don't know how to do that. how can I delete all information in a table in database?
View 3 Repliesi am new to working with databases, I have done some of my own research and have been adding and regtrieving records without trouble. Now I need to retrieve a specific record based on a selection made by the user. I found that the way to do it is with the WHERE statement and from examples i have seen the code below should be how it is done:[code]The problem I am having is that when i try to run the sub i get the error:Syntax error (missing operator) in query expression 'Show Name = Strictly Hip Hop'.The show name is in the database because that is where the data is retrieved from. All I am trying to do is populate a text box with information from the Host column when the Show Name column is the same as the selected item in the combo box.
View 7 RepliesI have a problem getting the right information to a ComboBox.I have a table in SQL Server that contains a list of names.I want to get those names to appear in my ComboBoxes shown in the picture. (DONE)I also want the list of names to decrease by the names already used in other ComboBoxes in that Form...
EXAMPLE:So, lets say I have a list:
Name_1
Name_2
Name_3
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In the Form, there are 10 ComboBoxes.I choose the Name_1 for ComboBox1, Name_2 for ComboBox2 and Name_3 for ComboBox3.The options available for all other ComboBoxes should be Name_4 ... Name_6.If all of the 6 names are filled, the rest of the ComboBoxes should have no option to insert into them...
I am populating a datagridview with information from a database. One of the columns is a monetary amount. Right now my datagridview columns just show a double.
View 2 RepliesI'm new to VB.NET and having problem with retrieving information from a MySQL database, when populating the datagrid. [code]
View 17 RepliesI need to be able to save data from a datagrid for recall later. The next day for instance. I dont want to use a database. I dont thing that using the user.config system is the right way.davidbell
View 12 Repliesi just want to ask how can i show information from my database into label..
Im using Visual Basic 2010 and . Net connector..
this is my sample codes and i dont know how to put it..
CN.ConnectionString = "Server=localhost; database=libsysdb; Uid= root; pwd=dbpass; Port=3306"
Dim myCommand As New MySqlCommand
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I'm working on a project with includes a student login system and Staff control. This has been successful although i am trying to find out how to show specific user information from the student login.The project is based on students getting points for "good behaviour and attendance" which is controlled by staff who teach them and students can redeem the points on set prices e.g. from pens to cinema tickets.Here is my student login code
Private Sub OK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK.Click
' Connects the .NET framework to the OleDb database and selects the file wanted for use
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