Supply SqlCommand Parameter Value?
Aug 8, 2009
Below is an UpDate Statement I am practising with David Sceppa's book ADO .NET 2.0 Core Reference pages 467 - 468. I can supply the parameter values for "parameter_New" by doing something like:
da.UpDateCommand.Parameters("@OrderID_New").Value = myTextBox.Text
And so on...My problem is how to supply the value of "paramete_Old" to be able to compare before update. I gues it has to do with obtaining the Original values of the rows based on RowVersion but I don't know how to effect it.
strSQL = "UPDATE [Order Details] " & _
"SET OrderID = @OrderID_New, ProductID = @ProductID_New, " & _
"Quantity = @Quantity_New, UnitPrice = @UnitPrice_New " & _
[code]....
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Nov 19, 2009
sqlCmd.Parameters.Add(New SqlParameter("@DateCreated", SqlDbType.DateTime)).Value = CDate(Now)
it throws error. Kindly suggest how can I assign date to sqlcmd parameter.
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May 2, 2012
VB Imports System.Data.SqlClient Public Class frmMain
[Code]...
I have three ways of adding parameters to my query commented out above. The all seem to return 1781 records (which is all of the records) and will not filter out to what the UserName variable equals which should reduce it to 32 rows.
I use a Console.WriteLine to show that the UserName is indeed my username. But it seems to not be getting passed to the query properly. I tested the Stored Procedure before even starting in on the program, so I know it functions properly. I just don't know what I'm missing from a VB.NET perspective to get the same results into my DataTable.
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Oct 23, 2009
I use SqlParameters when executing database statements. I know that I can replace a single quote with two single quotes... but in the past SqlParameters took care of this for me. I have two projects.. in one, the SqlParameter does this and it handles single quotes fine, in another, it does not and I'm at a loss why (I even copied and pasted the code):
[Code]...
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Apr 19, 2010
Can anyone explain to me the difference between Arrays and Records and supply some code showing the differance between the two, as an example.
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Jan 11, 2010
I have only really gotten into VB, so am an amateur.I have done quite a lot of search, and have read a lot of conflicting data which has yet to give me the result I'mafter.I have:Windows Form with many fieldsdatabase with 2 lots of data for reference.What I am after if for TextBox2 to give a result from the database when Textbox2 has user input.I have tried If TextBox1 = [Code] then TextBox2 = [Name] from db0 Names$
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Feb 27, 2011
I was wondering if somone one could point me in the right direction on this.Basically I am making a proxy testing program. A user can supply a list of proxies to test. What i want to be able to do is have them be able to specify how many threads they want to run. Then have the program go through the list testing each one using the amount of threads supplied. Really not sure even where to start on this. Threadpooling?
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Jan 17, 2009
I am doing wrong? I am using VB2008/VB.NET to send a command (set to 4 volts) to a Tenma DC Power Supply over an RS232 cable. I don't have documentation from Tenma that lists the commands that the instrument understands, I got "VOLT040" from a program in an older version of VB that someone else wrote for this instrument. The code is below:
[Code]...
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Sep 28, 2006
Is there any way to use a VB form to supply user credentials to the Runas command in command prompt? I basically need something exactly the same as the GUI for RunAs but just for Internet Explorer (yes I know you can right click and go RunAs but that cant be done in this case). So the user would open this VB form, type their username and password in, hit OK and it would open Internet Explorer with their credentials (they log in under a generic account used by many people).
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Mar 19, 2012
I wish to put the XMLSerializer behind a 'facade' class of mine so that user wont have to supply type info to the constructor. But doing this has a problem. Consider this class:
Class XmlFormatter
Private Shared xs As XmlSerializer
Public Function Deserialize(ByVal serializationStream As Stream) As Object
Dim o As Object = Nothing
[code]....
The problem is that the user of this class cannot use Deserialize without first using Serialize because the XMLSerializer instance is created in Serialize and it is shared. But using Deserialize without this instance will simply return Nothing.
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Jan 17, 2012
[code]...
Is this possible to run 2 SqlCommand together??
Because after executed somehow the 2nd inside the loop did not execute or insert data.
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Oct 15, 2010
I have an SqlCommand with parameters. Due to some external requirement (see PS), I need one T-SQL string instead, i.e., I need ... @parameter ... replaced by ... the-value-of-@parameter-encoded-correctly ... (e.g. O'Brien --> 'O''Brien', 02 Mar 2010 --> '20100302', 3.5 --> 3.5).
I know that I could home-brew such a solution quite easily, but correct escaping is tricky (make sure you get the right date and number formats, watch for quote signs in strings, etc.), and I guess that I'm not the only one needing this, so my question is:
[Code]...
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Aug 29, 2011
In order to check if specific user is db_owner, i excute the following query:
"select is_rolemember('db_owner', '" & p_userName & "')"
using the SqlCommand ExecuteNonQuery method.How do I get the query result?
Here is my code:
Dim com As SqlCommand = New SqlCommand(sql, m_connection)
com.ExecuteNonQuery()
[code].....
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Aug 13, 2010
I am encountering a strange problem when attempting to execute a DELETE query agains a SQL Server table using VB.NET, SQL Command, and Parameters.
I have the following code:
Try
sqlCommand.Transaction = transaction1
sqlCommand.Connection = conn
[Code]....
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May 19, 2010
I am experiementing with table updates and the code below gives me the following error message: "The variable named "@Processed" has already been declared... at the following code line: clsWTAdapter.Update("clsWTDataTable"). I fear that all of my code is a general mess, and I am sure there is a much better way to go about it.
Dim clsCmd As New SqlClient.SqlCommand
Dim clsCMAdapter = New SqlClient.SqlDataAdapter("SELECT * FROM CatalogMaster WHERE Processed <>-1", clsCnn)
Dim clsCMDataTable = New DataTable("CatalogMaster")
[code]....
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Jun 1, 2011
I have a Stored Procedure which returns 10 columns of data. Using cmd.ExecuteScalar() returns the value of the 1st column from the 1st record. How can I change this so that I can return different columns, by specifying their alias/dataitem name?
I want to be able to do something like: Dim FirstName as String = cmd.ExecuteScalar("FirstName")
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May 20, 2010
[code]in this code, do the objects con and cmd get disposed because the return statement is placed before the end using statement.
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May 19, 2010
If there an easy way to get a completed SQL statement back after parameter substitution? I.e., I want to keep a logfile of all the SQL this program runs. Or if I want to do this, will I just want to get rid of Parameters, and do the whole query the old school way, in one big string? Simple Example: I want to capture the output:
[Code]...
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Apr 8, 2009
I am almost finished building my application. All the data need is being inputted from various locations. I have a form that is suppose to consolidate all this data into a specific format. There are 47 fields that have to be populated and/or calculated based on two fields, the Username and a date range (this part is done). I was trying to set each of the TextBoxes equal to the SQLCommand that would return the proper value, but i am not calling it correctly. Would somebody please take look, is there something i am missing, do i need to write it in a function? I have had to use the Select statement itself in a couple of filters so I'm pretty sure that is correct, but i need help getting it to run the sqlcommand.[code]
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Oct 23, 2009
After the SQL Publishing Wizard has generated a database script I would like to know if it would be possible to execute the whole SQL script using the SqlCommand object, to recreate the database all over again, in case anything goes wrong?
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Feb 8, 2012
I have a VB.net script that runs a simulation on several machines within the domain. During this simulation, a login is initiated to an application via a web portal. After the login, the connection to a specific Citrix server (whichever is least busy) is established. At this point, I want to run a Netstat -r | find (IP Range of server farm) in command line. From what I have deduced, I probably won't be able to do what I want from the command line and everything will have to be with in the VB.net module using System.Net.NetworkInformation. I am a Citrix Administrator with a decent level of .net experience but I am having trouble with this.
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Mar 3, 2010
In a for each loop I am adding rows to a table for a cross reference. Using the following code:
For Each cp In pCheckPoints
If cp <> String.Empty Then
Dim insertSQL As New StringBuilder
With insertSQL
.Append("INSERT INTO [CheckpointMessage] ( ")
Without the objCommand.CommandText = String.Empty line the CommandText is appending the insertSQL but that doesn't make any sense to me because I would expect the objCommand's commandText to be empty since it is in a using block.
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Apr 17, 2009
i tried this sqlcommand select max(food) from foods and i tried this dim x as double=cdbl(cmd.executescalar)and it throws the the exception {System.Invalid CastException}because the food table is empty and the max(food) is null how can i fix that because i want to take the value and add one to it so do i need to catch the error or try another conversion option?
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Jun 16, 2010
I'm trying to update a record by using the following code but it's not updating it, the value stays the original database value.[code]
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Apr 11, 2011
I'm a novice VB programmer and I am getting the above error when I try to display the results of one of my Stored Procs in SQL Server which doesn't need any parameters.
My code excerpt:
Dim SQLCmd as SQLCommand = new SQLCommand()
SQLCmd.CommandText = "Exec AllTableCount"
SQLCmd.CommandType = CommandType.StoredProcedure
SQLCmd.Connection = GlobalFunctions.GlobalF.GetDevSQLServerStoredProcedure(SQLCmd.CommandType)
SQLCmd.ExecuteNonQuery()
[Code] .....
I can see this SP from VS 2008 in the Server Explorer. So the problem seems to be that I don't know how to connect a data adapter to an SP. Just a string query.
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Feb 6, 2010
I'm using the following select statement and it works fine but I need it to AutoComplete the results that contain the term as well and not just the results that start with the term. To clarify, if I type in "phrase" it won't AutoComplete the result "my phrase" but if I type in "my" it will. Anyone have a clue what I'm doing wrong? I've tried to use "contains @term" instead of "like @term" but
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Nov 5, 2009
Can I use two command object with one open connection in one procedure at VB.NET?
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Mar 18, 2010
retrieve the actual T-SQL that is to be executed by a SqlCommand object (with a CommandType of StoredProcedure) before it executes...My scenario involves optionally saving DB operations to a file or MSMQ before the command is actually executed. My assumption is that if you create a SqlCommand like the following:
Using oCommand As New SqlCommand("sp_Foo")
oCommand.CommandType = CommandType.StoredProcedure
oCommand.Parameters.Add(New SqlParameter("@Param1", "value1"))
oCommand.ExecuteNonQuery()
End Using
It winds up executing some T-SQL like:
EXEC sp_Foo @Param1 = 'value1'
Is that assumption correct? If so, is it possible to retrieve that actual T-SQL somehow? My goal here is to get the parsing, validation, etc. benefits of using the SqlCommand class since I'm going to be using it anyway.
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Dec 17, 2010
I have a stored procedure that repeats a block of T-SQL statements using WHILE logic until it finds a matching record in a table. When I execute the procedure directly from the SQL Management Studio, it works and returns a record, even when the statements within the WHILE logic have to be repeated over and over again before a matching record is found.
However, when I use the same stored procedure as the commandtext property of an sqlcommand object in Visual Studion 2008 (VB) and call the executereader method of the sqlcommand, the resulting SqlDataReader will only return a row if the T-SQL statements within the WHILE logic find a matching record after a single pass. If it takes more than one pass to find a matching record the SqlDataReader does not return a row. It's like it abandons the execution of the stored procedure after the first pass of the statements within the While logic, disregarding the repetition.
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Jun 15, 2009
I have a datalist that returns multiple entries and I need to insert values via an OnClick command for a button I have with each entry. Problem is it's saying that a label I have in the datalist is not declared, in particular the MyLabel.Text from my Insert statement below.Can someone show me with code how I can declare this label or is it even possible? When I put the label outside of the datalist, everything works fine but when it's inside it says it's not declared. [code]...
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