Ok I'm creating a sql query with a string variable and executing it in vb. The string would look something like: Insert Into Table (vara,varb,varc) Values ('vara','varb','varc') This works fine.
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I have two module-level variables and Linq query. I want the results of the Let clause to change the global variables - is this possible?
For example:
Dim X As Integer = 0
Dim Y As Integer = 0
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Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
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i am using vb.net 2008 and msaccess i have given the following query to fill a dataset but it is giving me an error. mCmd = " SELECT OfficialInfo.*, "
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I am getting the error:"Range variable 'sender' hides a variable in an enclosing block or a range variable previously defined in the query expression."for this
Imports System.Data.SqlClient
Imports System.Linq
Public Class Form1
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I can select any other item from the table without the error. "sender" has the same properties as "receiver" in the SQL table.
Right now me filling a combobox by this way.
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By this way combobox CmbId is storing above sql query ouput. But now i want to get above query ("Select Name from StudentDetails where Id=10 ") result to store in a variable string. How can i do this ?
I need to pass a string variable into a wql query:
Dim booking As String = System.Configuration.ConfigurationManager.AppSettings("PlayersFile")
Dim query1 As New WqlEventQuery( _
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However, I'm uncertain how to make the variable booking parsable by the query.
This is probably so simple however my brain has decided it wants a night off. I am trying to write a program that uses SQL queries for various tasks but I need it to allow the user to be able to use which ever name they want for the database name. therefore I need to be able to reference the database as a string variable. For Eg:
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I've recently been trying to figure out a way to get parameterized queries to work and i think i'm almost there but seem to be getting an error when executing my query
Here's the code
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I have been using adodb as my database connection to mysql from vb.net, now I want to know if i can create a query string with 2 separate query like so:
vb
dim querystring as string
querystring="update table1 set columname = 'value' where columnname='value';update table2 set columname1 = 'value1' where columnname2='value1'"
Then I can include that to my recorset:
vb
dim rs as adodb.recordset
rs = new adodb.recordset
rs.open(querystring,con, ADODB.CursorTypeEnum.adOpenDynamic, ADODB.LockTypeEnum.adLockOptimistic)
I`m now at the point calling server from vb.net, and run query inside vb.net code.I have write two codes on button click. One button is checked server connection, other should execute query for server table.Connection code is working, as I have set two messages, and getting successfull message. Second code is not working, as nothing happened when press button. Sql statement is very simple, and it works if I run it manually.[code]
View 19 RepliesI am using VS2008, language VB, and MySql.I have a simple database app joust for practice. It has one table that contains ID, Name, Surname and Age fields. The code I am using is:
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Now I would like to something like this:
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Value of type'System.Data.EnumerableRowCollection (of char())' cannot be converted to 'string'.What am I doing wrong?
'Initialize The Database Connection'
Dim dbTRCoreDatabase As New TRCoreDatabase
'Query For Get The Employee ID'
Dim listEmployeeID As IQueryable(Of Long) = (From EmpMaster In dbTRCoreDatabase.EmployeeMasters Where EmpMaster.Email = [code]....
I have a string qText with the text of a query in it, say qText = "select * from Data". how can I execute it to fill a TableAdapter I have in my form with the resulting data?
View 2 RepliesWhat's wrong with my code, the query seems to be fine, I tried executing it on phpmyadmin.
CODE:
I got this error: ERROR [42000] [MySQL][ODBC 5.1 Driver][mysqld-5.1.36-community-log]You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
I am writing a program that has a listbox which is bound to a dataset. When I click a button (e.g. delete) the item is deleted from the database ok using an SQL query but is still shown in the listbox. How do I get the listbox to refresh/update its display?
View 8 RepliesWhen Creating a query using the sear Criteria Builder . I keep getting the error : "The schema returned by the new query differs from the base query" what does that mean and how do i avoid this problem in future
View 2 RepliesLet's say we have the following
Dim number1 as double = 2.24
Dim number2 as double = 12
Dim symbol as string = "-" (or "+" or "*" or "/")
How is it possible to execute this operation using the operator from the variable?
I am trying to execute Plink from a Windows Service. I have tried creating a bat file and executing directly as a command and neither works. I the bat file it acutally initiated the command but it didn't execute, just sat there till I killed it. in a bat file
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I am trying to run a query an Access db from VB. The general query which I want to run is
SELECT * FROM Patient WHERE Patient.PatientID = ?
or SELECT * FROM Patient WHERE Patient.PatientLname = ?
I tried using an input box which captured the user input and pass that variable to the query, but that failed. Then I read about writing a function and using that, however, I keep getting an error which says Function not defined, but when stepping through the code, it seems to work. Here is my function: [Code]
I'm looking for a way to search a string variable for two words and copy the text in between them into another variable. This needs to be done as many times as the match occurs.
View 3 Replieshow can i execute a shell command from a string
shell("cd", StringName)
the string comes from a user entered textbox
StringName = Textbox.text
how can i get this to work?
Im trying to create an app that can Compile and run vb.net code while running. Like I will have a multiline textbox and a button that runs the code. The code should run as if it Were to be in a normal Sub. I've heard of system.reflection but all the examples microsoft provided have failed.
View 4 RepliesIs there a way to convert a string into a linq query? Searching for those words brings up tons of stuff unrelated to what I'm trying to do..For instance, this works, of course...
Dim lstMyQuery = (From item in htMyTable.values where item(0) = "Apple" Select item)
But somehow I want to do this:
Dim strQuery = "From item in htMyTable.values where item(0) = " & CHR(34) & "Apples" & CHR(34) & " Select item"
Dim lstMyQuery = (Somehow run/convert strQuery as a query)
The reason is strQuery will be different each time depending on what the user has selected earlier in the program.R if lstMyQuery is already a collection, is there a way to add to it?
Dim lstMyQuery = (From item in htMyTable.values where item(0) = "Apples" Select item)
(this obviously doesn't work, but it's basically what I want to do...)
lstMyQuery.Add(From item in htMyTable.values where item(0) = "Oranges" Select item)
My program asks the user for the location of the database and stores the location in the variable "filename"I then have this:Dim ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & filename
View 2 RepliesI'm creating a hash with the following
vb.net
Private Function String_Hash(ByVal text As String) Dim _hash As Byte() = _enc.GetBytes(text) Dim hash_alg As HashAlgorithm = New SHA512CryptoServiceProvider() Dim _chash As Byte() = hash_alg.ComputeHash(_hash) Dim sBuilder As New StringBuilder For Each b As Byte In _chash sBuilder.AppendFormat("{0:x2} ", b) Next Return sBuilder.ToString() End Function
What's a salt?How can I add it to the code?
I have a problem with a sql query. Through the query I am trying to search database for any occurrences of string (can be anything) in a column using the SQL LIKE command. The problem is that it works fine for most of the strings say john, jim, ji"m , but does not work when i include the following characters which are ( ' , { , } , and a single quotation mark). MYSQL query takes care of these special cases by putting them in [] block whenever user enters them .But i am getting the following error when i go to query the database using the GetSelectCommand() in VB.NET
Exception Details: System.ApplicationException: Number of values provided must be equal to the number of placeholders in query.I have checked the query over and over again .. but its fine .My database server is Sql Server 2008.So my application throws the exception in this command:
Using reader As MustDisposeDataReader = _
pmSystem.DatabaseManager.GetSelectCommand(selectStatementBuilder.ToString(), New Object() {})
Where MustDisposeDataReader is an instance of a class in an internally developed library, which inherits from System.Object. pmSystem is an instance of the class PlanManagerSystem which implements the commandlayer. GetSelectCommand() takes the select command
In one function I have the variable: dim StrProjectNumber = UCase("23-EXP-16284")
However in another form I want to use that same variable in a SQL query, and when I try it says the variable is not declared. Do I have to make a global variable or is there a way around it? If so, how would I go about declaring a global variable?
I had a look through this forum and other forums but couldn't find what I was looking for. I am new to visual basic and have spent all day trying to find the solution to the following issue.I am creating objects from a class that store information about the user of the program. Each time a user signs up the program, I need the code to create a new instance of the class, creating an object and storing information about that user. The contents of this object will then be saved into a text file.
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eally been struggling with this one, and i cant seem to find a simple method of doing it...surely there must be one? I have a list of values that i am loading into a variable. I am trying to split that variable by the whitespace that separates each value...the only thing is the whitespace varies in size. eg.
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