In every date field I have, I cannot update it if it is null. For instance, I have the following query and it will throw an error if the date fields are Null or zero lengths. Any ideas? I try and parse and get the following error: String was not recognized as a valid DateTime. if i don't, it throws a null error.[code]
View 7 RepliesNow that I've switched over to parameterized queries, everything is great except along with handling all the special characters that would otherwise disrupt an all text SQL stament, it's handling the word NULL. My code basically does this for every variable used in the entire SQL statement:
If strCallName = "" Then
strCallName = "NULL"
End If
[Code]...
and that worked great for my old all text ones because leaving the word NULL out of single quotes would tell it yeah, that's actually null and pass it a true null value. Now with parameterized ones, it's literally passing it the word NULL I tried just leaving the string empty but then when I try to execute the command, it says that the parameter cannot be a zero length string. So how do you give a null value to a a parameterized query and make it actually send that to the database in the statement? Would strCallName = vbNull work or would it still say it's a zero length string?
I have the following query that I use to create a new record in a database. If I leave any field on the form blank, for example, it throws the error "Memo.Lastname" cannot be a zero length string. Other than that the query executes appropriately.
Private Sub cmdSaveMemo_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles cmdSaveMemo.Click
If Len(Me.txtMemoID.Text) <> 0 Then
Memo.SaveMemo
[Code] .....
I have some date fields that I want to not have any dates during a record creation. I figured the way to go would be to insert NULL. The way I'm going about it now gives me a Type mismatch error.[code]...
View 2 Repliesi get the date value from other field then need to insert it into other database. but the problem is when the column is null the n it cannot insert it.
View 1 Repliesi have a maskedtextbox which will accept only date in the format of "DD-MM-yyyy" no i want to insert this date in my db. i have done this successfully.
Now i want to insert null value in through that maskedtextbox .
I am using a Command Builder for OLEDB, I populate the Data table from the database, and then I use data adapter's Update method to add or update the database successfully.
[Code]...
How do you insert/update in a datagridview which is 2 table is bound into it (inner join statement)Best Regards,Iannoob vb programmer
View 1 RepliesDim cBuilder
As
New OleDb.OleDbCommandBuilder(dAdapter)
Dim dsNewRow
As DataRow
[CODE].....
when the program is already save the data and when the process is on updating the dataset it give me error say's"Update requires a valid UpdateCommand when passed DataRow collection with modified rows."The error occur at the line in bold letter in the codes below..
Dim classgroup As String
classgroup = ""
If Me.ClassComboBox.Text = "Key Project" Then
[code].....
I have finally been dragged kicking and screaming into the 21st Century and I'm learning VB.NET
[Code]....
I get a "Syntax error in INSERT INTO statement" on the da.update line. The bulk of the code is copied from a working section of the program, I have just added the "newrow" stuff. I am pretty confident I have the names of all the fields correct.
Title pretty much says it all. How do I format the date of a dateandtimepicker to insert it into the SQL date datatype?
View 20 RepliesI've got what I think is a working left outer join linq query but I'm having problems with the select because of null values in the right hand side of the join.[code]I want to return all of e and one column from c called tClassCode. I was wondering what the syntax would be. As you can see I'm using vb.net.[code]If i remove the c.tClassCode from the select the query runs without error. So i though perhaps i needed to do a select new but i don't think i was doing that correctly either.
View 2 RepliesSee
Public Class Form1
Dim sql As String
Dim conn As New OleDb.OleDbConnection
Dim da As New OleDb.OleDbDataAdapter
[CODE]...
The problem, The INSERT statement works fine in the form load but not in the button click event?
Im getting an error with my insert statment "Syntax Error in INSERT INTO statement". I do not understand why. Im using global variables from form 1 and using them in form2 and trying to insert them from form2 into the database.
[Code]...
Table 1 has fields: A, B, C, Table 2, there are fields: D, E, F, Table 3 has fields: G, H, I
Connect the condition that A = D and F = I
provide a look at Table A left join B, C of the SQL statement
I have a lot of really long strings that I want to test. Is it possible to use the CASE statement and compare it to the first 25 characters of the string to get a match?
View 14 Repliesi'm having troubles with a linq-to-sql statement and getting a left outer join to work. here is a sample of two tables i'm trying to join and my code that i've wrote.
Table1 Table2
f1 f2 f3 f4 fID f1 f2 f3 f4
val1 val2 val3 val4 1 val1 val2 val3 val4
[code]....
Instead I'm returning ALL values from table 1. I need to return all values from the left outer join where tbl2.fID is null.
How to insert Left, Right, Mid functions in vb.net project. Presently I am Right function, But An error occurred 'Public read only property right() as integer ' has no parameters and its return type cannot be indexed
Dim s As String
s = Right$("sdfsd", 5)
update statement, i am trying to update a row within a access 2007 database here is my code.
[Code]...
I am still a newbie with VB. If I return a number the if statement works fine, with opening the new form and updating it as needed. Id the if statement returns a Null from the database it crashes.
[code]...
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
[Code].....
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
My code seems to behave a way I don't understand. Sometimes it returns null as expected and sometimes it returns a value when its supposed to be null. How can someone explain this? Here is the code that selects from access and displays the result in a messagebox:
cmd5.Connection = cnn
cmd5.CommandText = "SELECT receipt_num " & _
"FROM brought_coffee, farmer where crop_year= " & yr & " and " & _
"brought_date=#" & dtt & "# and farmer_centre='" & ctr & _
[code]....
I have a gridview that is set to a sql datasource, it is generating the columns automatically. If I add a column to the table it is referencing, it will draw that column and display it, but it does not update the insert/update commands to include the new column. Is there any way have it rebuild those commands automatically?
View 1 RepliesI have a gridview in which when I click edit, update, and cancel button comes. I have a variable named status. If status=false then update should change to insert and if status=true then update should be update itself.
<asp:TemplateField >
<ItemTemplate>
<asp:LinkButton ID="lnkEdit" runat="server" CommandName="Edit" Text="Edit">
</asp:LinkButton>
[code].....
How can i return null values in if statement above. This statement is not working if condtion is false its retruning me 0 value even if condition is false
dim d as nullable(0f Decimal)
d=(if(_dr("value") isnot dbnull.value,Convert.toDecimal((_dr("value")),Nothing)
I have two tables, a LP_task table and an lp_Update table. I want a complete list of tasks and only updates that were posted during a specific date range. LINQ doesn't seem to support any other join criteria but 'equals'or each task. I want all tasks (left table) even if they don't have an update. (Left Outer Join)
Dim TasksData = (From t In db.LP_Tasks _
Group Join up In db.LP_Updates On t.ID Equals up.TaskID Into upds = Group _
From u In upds.DefaultIfEmpty _
[code]......
Is there way to insert null into mysql from an empty text field in vb.net
View 1 RepliesI have this simple-minded query:
select a.str_number+' '+a.str_name+' '+a.str_suffix+' '+a.str_apt AS addr from mytable
This query works as long as none of the concatenated values are not NULL. If any is null, the address does not show.
I tried this:
select IsNULL(a.str_number+' '+a.str_name+' '+a.str_suffix+' '+a.str_apt AS addr,'') from table
What I would like to accomplish is to replace NULL with empty space if the value is null but I still get no values.
I'm making a data application and using the data adapters, I created a query in the designer:
EmpActivities_TableAdapter.InsertQuery(IdTextBox.Text, ActivityComboBox.Text, DescriptionTextBox.Text, Cdate(adddate.text))
The question is how can I set the adddate to null or nothing and save it? I'm using SQL server for the data.