Microsoft - How To Use Parameterized Queries
Dec 5, 2009How to use parameterized queries in vb.net? Because I always wanted to make a program that could read an ms access database and display results based on your query.
View 1 RepliesHow to use parameterized queries in vb.net? Because I always wanted to make a program that could read an ms access database and display results based on your query.
View 1 RepliesUsing parameterized queries with ms access 2003 integration. To search any data according to different criteria.
View 2 RepliesI am writing a message system on my server, the xml is something like this
<xml>
<entry>
<sender>[code]....
my problem now i guess is 2 fold, i wish to combine the first 3 queries into a single query and place in a list or a collection or is there a way to do this with a single query that will give me my desired result?
In my project I need to log all queries executed against my database. As an example we can use the staff user data here. In that class I have a function generating the command with the parameters as follows:
[Code]...
[Code]...
What am I doing wrong? BTW, I know nchar(10) is not a good choice for first and last name.
statement = "SELECT OrderID, (SELECT VendName FROM Vendors WHERE Vendors.VendorID = Orders.VendorID) " &
",OrderDt, RcvdDt, OrderTotal " &
"FROM Orders " &
"WHERE VendName=? " &
"ORDER BY OrderDt DESC"
Dim cmd As New OleDbCommand(statement, connection)
cmd.Parameters.AddWithValue("VendName", txtVendorFilter.Text)
Dim reader As OleDbDataReader = cmd.ExecuteReader(CommandBehavior.Default)
I was trying to do this before by simply concatenating the textbox value right into the SQL and I was getting a "No values given for required parameters", and read that that I should use parameterized queries instead. So I tried this and it doesn't give me any errors, but the reader never has anything in it. I've never used parameterized queries before, so I'm a bit lost as to why this isn't working. I've changed the above code to account for OLEDB from what I briefly read on how it should work, and it's giving me the "no values given for required parameters" again.
I keep getting this error :
The parameterized query '(@AdminEmail nvarchar(4000),@AdminPassword
nvarchar(4000))SELECT' expects the parameter '@AdminEmail', which was
not supplied.
[code].....
I am coming from the C# world to VB.NET and this puzzles me. Why are there 2 ways of doing the same thing? or is there some difference I am not aware of? What is the difference between the following:
Public ReadOnly Property Test(ByVal v as String) As Integer
Get
Return SomeOperationOn(v)
End Get
End Property
And
Public Function Test(ByVal v as String) As Integer
Return SomeOperationOn(v)
End Function
When do you use one as opposed to the other?
How do I make a parameterized query in the database with VB.NET? remember to mark the replies Welcome to the All-In-One Code Framework! If you have any feedback,
View 1 RepliesI'm trying to LINQ two tables based on a dynamic key. User can change key via a combo box. Key may be money, string, double, int, etc. Currently I'm getting the data just fine, but without filtering out the doubles. I can filter the double in VB, but it's slooooow. I'd like to do it in the LINQ query right out of the gate.
[Code]...
"Range variable name can be inferred only from a simple or qualified name with no arguments."
I solved this issue in this thread but there still are issues with special chars. ie 'I thought by doing parameters that it would take care of any special chars for you. Well i am still getting mysql exceptions about syntax. I look at the string it is working with and it has a "'" in it.Why are they not working as I expect them to?
View 7 RepliesAs you may have seen in my other post, I have to switch over an all text SQL statement based database interaction program to using parameterized queries instead.I remember doing it this way in college but I don't seem to be able to recall one part of it. The program I wrote back then and some code samples here both point to doing the code as I did so far:
m_strSQL = "UPDATE [OWNER DATA] SET [FIRST NAME] = @strFName"
m_strSQL &= ",[LAST NAME] = @strLName"
Dim upCMD As New OleDb.OleDbCommand(m_strSQL, m_Connection)
upCMD.Parameters.Add("@strFName", OleDb.OleDbType.Char, 30, "[First Name]")
[Code]...
it ran the SQL statement and that's that. Can I just do that with a parameterized query too without using the adapter.update()? And for bonus points, why the heck did I use that command in my old college program cuz I sure don't know?
In my previous application using Linq2SQL I was able to overload constructors with parameters by doing this:
Namespace CoreDb
Partial Public Class Accomplishment
Public Sub New(ByVal accomplishmentTypeID As Object, ByVal description As String, ByVal title As String, ByVal applicableDate As DateTime, ByVal lastUpdatedBy As String)
[code]....
Basically using a partial class off the object, sharing the namespace of the .dbml file and calling the default constructor and then doing additional stuff. So then in my code I could do something like:
Dim accomplishment As New Accomplishment(id, description, title, applicableDate, lastUpdatedBy)
This seems to no longer work in Entity Framework as there is no default constructor to call.Does this no longer work? And if so what is a good alternative to implementing something like this?
Trying to do a mysql parametrized query and i'm having a little issue.
cmd = conn.CreateCommand
cmd.CommandText = "insert into `rootforest` (rootforestname, BusinessName) VALUES (?rfname, ?bname)"
[Code]....
It errors on the executenonquery. Says the column rootforestname can not be null. i don't under stand why it does not fill in the value in the command text.
The
vb.net
For i As Integer = 0 To recorderInformationForm.DVRSDataGridView.Rows.Count - 1
strsql = "UPDATE DVRS SET DeviceName = ?, IP = ?, Notes = ?, " _
& "LastStateOnline = ?, TimesOffline = ?, port1 = ?, " & _
"port2 = ?, port3 = ?, port4 = ?, port5 = ?, port6 = ?, port7 = ?, port8 = ?, port9 = ?, " & _
"port10 = ?, port11 = ?, port12 = ?, port13 = ?, port14 = ?, port15 = ?, port16 = ? WHERE DeviceName = " & recorderInformationForm.DVRSDataGridView.Item(0, i).Value.ToString
[Code] .....
The Error:
Syntax error (missing operator) in query expression 'DeviceName = 001a'.
on line: ocmd.ExecuteNonQuery()
I think it might be something with the parameter symbol (?) and the WHERE clause but not sure..
im having a problem with my code Private Sub TextBox2_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox2.TextChanged
[Code]...
once i typed in the string in the textbox to search for an item i get this error The parameterized query '(@Parameter1 nvarchar(4000))SELECT * FROM borrow where (Departme' expects the parameter '@Parameter1', which was not supplied.""
I added a query. FillByDate using Table Adapter which takes a date as input from the code.The query I have set is the following:
SELECT YMD, AIR_TEMP_AVG, AIR_TEMP_MIN, AIR_TEMP_MAX
FROM mytable
WHERE (YMD = :PARAM)
[code].....
I wrote this little function to allow me to pass an ArrayList of Strings and then based on the table passed to pre-build a SQLCommand like so
INSERT INTO table` (`column`,`column`) VALUES (`value1`,`value2`);
The function for this is here:
Public Function _SQLInsertBuilder(ByVal values As ArrayList, ByVal Table As String) As String
Dim commandString As String
Dim columns As ArrayList = GetTables(Table)
commandString = "INSERT INTO `" & Table & "` ("
For Each column As String In columns
[Code] .....
Now I know that much like mysql_real_escape_string() VB.NET has a Parameter ability to make querys safer. How could I parameterize the values during the build of the string.
I'm trying to execute a sub with multiple parameters on a separate thread, but I just can't get it to work, Here's my code
[Code]...
[code]Myself and a coworker have stared at this quite a lot and we can't figure out why it's not working. The problem is in the value for @ID (since it still works when I leave the other one parameterized). The funny thing is, Just a few lines of code above it I have a different query that sets a parameterized value for the same ID, using the the same choices list that the For Each loop is getting the match variable from.Choices is a list of longs, and when I use choices(0) to parameterize ID in a query, it works. But now down here in this loop I have the new match long, and it doesn't want to make it work for me.
View 1 RepliesWhen it comes to constructors in a Structure type ,it is fact that we can not explicitly provide the default constructor .It is provided by the runtime. Ok, another point that is applicable to C# language is that if we are defining a parametrized constructor then it is compulsory to initialize all fields . We can not leave any field uninitialized , since the runtime will not call default constructor if we are calling parametrized constructor .Its logically right , but in VB.NET language , actually you are free to leave any of the fields uninitialized in your parametrized constructor.
[Code]...
I'm getting the error: The parameterized query(@CustomerID, @ProductCode, @DateOpened) expects the parameter @ProductCode, which was not supplied.For one thing, my INSERT query has five parameters, not just the three listed in the error notice.
Another thing, I supplied @ProductCode in the AddWithValue statement.
Another thing is that I don't get the error when I change:
InsertCommand.Parameters.AddWithValue("@DateOpened", Date.Today.Date)
[code].....
What is the Invoke syntax to marshall data from a background thread receive callback method to a function on the UI Thread?(Form1).
Public Class Form1
MyDelegate = New DisplayData(AddressOf DisplayData)
Private Sub Form1_Load()
MyDelegate = New DisplayData(AddressOf DisplayData)
[code]....
To revisit a previous question with a further stipulation..Anyone know how to do the following, IGNORING CASE?
[Code]...
I am using following code for Insert records from LIstview to table in MsAccess:
[Code]...
I'm getting an error when the 'insertcommand' is executed telling me that I'm missing the parameters for the stored procedure. Do I need to put the parameter names in the Sql statement after the procedure as if I were calling it in SQL? I saw an example online that just added the parameters like I have here, but this doesn't work? I also put the sql state for the stored procedure below the 'AddRepair Sub'
Public Shared Sub AddRepair(ByVal repair As ClubRepair)
Dim conn As SqlConnection = ClubRentalsDB.getconnection
Dim insertcommand As New SqlCommand("AddRepair", conn)
[CODE]...
I'm currently doing a project that includes access 2010 My question will be what driver can I use for an access 2010 *.accdb type file? For a *.mdb it works perfectly well with
ConnString ="Driver={Microsoft Access Driver (*.mdb)};Dbq=" & Application.StartupPath & "\CITSDB.mdb;Uid=Admin;Pwd=123;"
But, when I changed the mbd to accdb:
ConnString ="Driver={Microsoft Access Driver (*.accdb)};Dbq=" & Application.StartupPath & "\CITSDB.accdb;Uid=Admin;Pwd=123;"
It resulted in errors:
ERROR[HY000][Microsoft][ODBC Microsoft Access Driver]Could not find file '(unknown)'.
ERROR[IM006][Microsoft][ODBC Driver Manager]SQLSetConnetAttr failed
ERROR[HY000][Microsoft][ODBC Microsoft Access Driver]Could not find file '(unknown)'
And then it shows me that my code for
If dsLogin.Tables(0).Rows.Count = 1 Then
IndexOutOfRangeException was unhandled
Cannot find table 0
I knew it must be the driver but I don't know what accdb driver I can use for the connstring.
I have a database with one table.I'd like to populate an array with the values in the table so that I can work with the data.How do I copy the data from the table to the array?I am able to view the data with a DataGridView but can't find any info on extracting the data to an array or variable.
View 2 RepliesI have an error ERROR [22018] [Microsoft][ODBC Microsoft Access Driver] Data type mismatch in criteria expression. and I've been trying to solve this but unfortunately I couldn't get the hack of this error. I'm a newbie in dotNet.
Public Sub LogInContinue(ByVal senter As Object, ByVal e As EventArgs)
Dim LibDS As DataSet = New DataSet
Dim LibDA As OdbcDataAdapter = New OdbcDataAdapter("SELECT * FROM tblUserAccount WHERE Uname='" & txtUserName.Text & "'", LibConn)
[code]......
I am building a VB 2008 Express Edition application.I have built a database (with a single table) using SQL Server Compact 3.5 and have connected it to the project. I am able to view and edit the data using a DataGridView on a second form (tutorial made this very easy). I need to work with the data in the table within the application. how to easily load the entire table into an array or even read the table a row or cell at a time so that I can make all of the data available for manipulation within the application (the tutorials only seem to show how to display the data).
View 7 Replies