I want to know if it is possible to perform a mySQL query to get a single record (searched for by ID) and then split each field into a seperate text box.I think im ok with the SQLQuery to get the record. its the splitting it into individual text boxes that im strugling with.
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For a school programming project we are supposed to create a database with 2 tables country, and continent.then we populate country with every country name, population and continentID. For continent we populate with each continent name.
i have completed this step, and i am able to run a linq query to display all countries and corresponding continent into a datagridview. My problem arises because we are supposed to display each record one at a time, and be able to cycle through one at a time. I cannot for the life of me figure out how to do this.
for example if i made a query to select all countries in africa, i want to beable to display the name of the country, and population in textboxes. then have a next button that will go to the next record.
iv been reading through all ur post about the database. but i have further queries regarding searching a record in database through visual basic 2008. iv used your 1st approach (Use T-SQL Select command to filter records) from this link [URL]
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How can i get one record in my MYSQL database what command should i use like this one in visual basic. How should i do these in vb.net?. I want to total the amount of items stored in my MYSQL database and show it in my listview. . . .I just want to get one record and get their values is their a command that i can do that?. . . .
this my code in vb using MS ACCESS
While rst.EOF = False
If txtpcode = rst!pcode Then
rst!stocks = Val(rst!stocks) - Val(txtqty)
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Is this the right way to delete a record in a mysql im using a listview do i have to code the listview? I dont have any errors with this but it just wont delete the record in my database and in my listview.Is this the right way to use listview? when deleting a certain record.Not familiar using the mysql commands it makes me confuse and difficult to the properties of each of mysql commands they dont provide enough example using those properties in mysql and it is not well explained for me each of their properties im new with this stuff. [code]
View 8 RepliesI am am currently developing an application using Visual Basic 2005 and I am also using the .NET MySQL Connector. I have noticed that when the MySQL Connector executes a query the application freezes for a bit so I was wondering if it is possible to create another application with textboxes, labels, etc, that will be hidden and will execute these queries, but the main application will be able to read and modify data on the hidden application so that it won't freeze.
View 18 RepliesOk, the basic situation: Due to a few mixed up starts, a project ends up with not one, but three separate databases, each containing a portion of the overall project data. All three databases are the same, it's just that, say 10% of the project was run into the first, then a new DB was made due to a code update and 15% of the project was run into the new one, then another code change required another new database for the rest of the project. Again, the pertinent tables are all exactly the same across all three databases.
Now, assume I wanted to take all three of those databases - bearing in mind that they can't just be compiled into a single databases due to Primary Key issues and so on - and run a single query that would look through all three of them, select a given set of data from each, then compile those three sets into one single result and return it to the reporting page I'm working on.
I've spent a whole day on this already without figuring it out. I'm hoping somebody can help me translate the following MySQL query to work for SQL Server 2005:
SELECT MAX ( messages.date ) AS maxdate,
topics.id AS topicid, topics.*, users.*
FROM messages, topics, users WHERE messages.topic_id
= topics.id AND topics.user_id = users.id AND
topics.forum_id = " . $forumid . " GROUP BY
messages.topic_id ORDER BY maxdate DESC
$forumid is a QueryString value defined in the following VB.NET code-behind code:
forumName.Text = "<a href='ViewForum.aspx?forumid=" & row.id & "'>" & row.name & "</a>"
Basically i am making a software that will be interacting with a database (sql).Now what i wanted is a loop which after every 30 minutes, connects to the database finds some info and executes a bunch of statements.For the sake of testing i have made the timer tick at 1 second, and display a record in a database in a label continuously just to see if it works (i will later make the tick 30 min)Now this is what i have tried till now , it prints the record in database perfectly after 5 seconds, but after that just fails.[code]I want to infinitely make a loop in which after every 30 minutes has passed it would connect to the database get a record and then use the value of that record to perform some operations. And this has to be done in the background.
View 2 RepliesI'm using ASP.NET/VB.NET to create this with SQL 2005. I have a project where I'd like to take a set of records from a table, then send each one through an API, get a result and writeback the result to a table, then move to the next.
Initially, my thought was create a SQLDataSource that grabs all the records, then perform the action on a button to do the action of sending through each record.
Is there a way I can call the recordset from SQLDataSource and perform a loop? I'm thinking something like in Classic ASP/VBScript where you would open a RecordSet, do an action, then Loop until the RS was EoF.
I've been reading the official DNS RFC [URL].. and looking at articles like this that explain how DNS query packets are structured [URL].. but I'm having a hard time trying to combine the two and actually get to a point where I know what to do
Basically I know that I need to use UDP to send the query and there is only one type of query I actually want to perform - an MX lookup. So I'm hoping that means I dont need to account for a lot of things that anyone creating a complete DNS Resolver would need to implement.
The only experience I have with network communication like this is with protocols that are text based (and use TCP, but I dont think that makes much difference here, if anything UDP should be easier). DNS however is binary based and I just cant figure out how I would know what bytes to send down the wire for a specific MX query..
I have a query from within my vb.net code which searchs for a record by date. The date being entered via the code is in format dd/mm/yyyy, i need to search in the database using yyyy/mm/dd? Ideally i thought there may just be a function within MySQL which will convert this. If not in vb.net to convert the string 01/01/2011 to 2011/01/01?
View 1 RepliesI have a access database with these columns. USER_ID,COUNT,TIMES
Let say the current record is this:
USER_ID,COUNT,TIMES
STEVE20,24,1.5
Now I want to updated the current count record and times, but before updating I want the old record to be added to the new record. What should be my query?
I have created a SELECT FROM WHERE query to perform a search here is my code:
SELECT EmployeeID, DepartmentID, Forename, Surname, Role, Email, Telephone, Extension, Mobile, Photo FROM Employees
WHERE (Forename = ? or ? = '') and (Surname = ? or ? = '') and (Role = ? or ? = '')
I have then put the folllowing code to rung the query within my form:
Me.EmployeesTableAdapter.FillByName(Me.myDataSet.Employees, Me.ForenameTextBox.Text, Me.ForenameTextBox.Text, Me.SurnameTextBox.Text, Me.SurnameTextBox.Text, Me.RoleTextBox.Text, Me.RoleTextBox.Text)
When i search by forename or surname it works fine but when i search by role i get this error..oledbException occured No value given for one or more required parameters.
How do I perform an sql query onto a DataTable not a Database table?
View 1 RepliesIn my company we use Oracle Applications. Almoust every form in these applications have a common behaviour, which is:
Whenever the forms is opened one can immediately start entering data but one can also press F7, which makes the form to enter in query-mode. You can then fill one or more forms fileds with the data you are searching for and press F8, which executes the query and returns the data into the form. The query mode can be interrupted by pressing Ctrl+Q, returning to data entry mode.
My question is if there is a way of having similar behaviour on building VB forms. I'm using VS 2010.
How can i perform order by tCount in this Query?
Public sub StatReport()
Dim Transaction = xmlDataset.Tables("ebus_transactions")
Dim TranCounts = From T In Transaction Take 2 _
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I can achieve in VB what the following C# snippet does but it seems very clunky since I perform a Linq query to obtain the events for the relevant user. Is there a neat way?
ctx.FetchEventsForWhichCurrentUserIsRegistered((op) =>
{
if (!op.HasError)[code]........
I want to perform two hashing operations concurrently on a single file, without reading the file twice. Is there some way to share the FileStream between two synchronized hashing threads? For example:
Dim Stream As New IO.FileStream("...", IO.FileMode.Open)
Dim HashA, HashB As Byte()
Dim A = New System.Threading.Thread(Sub()
[code]....
Maybe some way of caching a stream? Trouble is, I don't want the entire file in memory at once (it could be many gigabytes in size) and I don't want the file read more than once, due to speed issues. I want the file cached only sufficiently to ensure that both threads can work.For example, suppose at some point in time, thread A had read 100k of the file, but thread B had only read 20k of the file. The portion of the file between 20k and 100k should be cached; but then progressively forgotten as thread B catches up. Then again, if thread B is too slow, we might still end up with hundreds of megabytes being cached.Maybe thread A should be made to wait while thread B catches up. Maybe the ReadByte() function of the stream should block for a while if one of the threads is too far behind?
I have created a project that has an add a new record, edit record and a search form, that has multiple text, combo boxes and is working great.Last nite I have added a checkbox under my add new record form and i am saving the checkbox value to my database, so far so good. I would like to be able to search any record that is mark with a checkbox to show up in my search screen when I do a search: [code] The problem that i am having is that now that I have added the code to my project to search for the checkbox field in the search screen and if I leave everything blank and click on the the search button I get no record found. I expected to see all that data, since I have nothing selected. Now if I click my checkbox, as soon as I click on my search button I see that two records that I have added for my test.
View 1 RepliesI am using Visual Basic 2008 Express edition along with mysql manager 2008.I have made a bank database and am looking to add a feature to update the balances of customers (individually) when i withdrawl or add money.The code i am using currently is
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
Me.Validate()
Me.StudentBindingSource.EndEdit()
[code]....
This is the same function as the Save record but, i want to be able to enter a value into a text box and then click the button to update the balance.
I'm making a project which is gonna store data into a database..
how to delete a single record in a datagrid..
I have a column for deletion..
here is my code..
If dtgItem.Item(e.ColumnIndex, e.RowIndex).Value = "Delete" Then
Dim resp As VariantType
resp = MessageBox.Show("Are you sure you want to delete this Item?",
[Code].....
I'm using Visual Studio 2008 and SQL Server 2008 and Crystal Reports.
Windows form with datagridview and a printbutton.
Is it possible, if I select a record in the datagridview, to print that record when I click the printbutton?
I have problem trying to update a single column. I initially insert an null value,
Here is the insert code..
CODE:
I have this code and whenever i try to run it, I always get an ODBCEXCEPTION WAS UNHANDLED ERROR [42000] [MySQL][ODBC 5.1 Driver][mysqld-5.0.51b-community-nt]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 'char VALUES('101','noodles')' at line 1
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i have problem to search and update record database sql. this is my code. i using mysql database and Microsoft Visual Basic 2008
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but i have error on Word command.ExecuteNonQuery(): MySqlException was unhandled. There is already an open DataReader associated with this Connection which must be closed first
i have the following piece of VB.NET code:
Dim conn As New MySql.Data.MySqlClient.MySqlConnection(ConnectionString)
conn.Open()
Dim sql = "SELECT * FROM users"
Dim com = New MySql.Data.MySqlClient.MySqlCommand(sql, conn)
Dim ds As New DataSet("dsUsers")
[Code]...
I'm very new to Access and VB, and im about to print a specific record.. but im getting an error with this [code]...
My reports name is AVR Ekstern, and the prime key is Rapport nr and the form im clicking the button and viewing the record in, is AVR
I have been working on a project which is used by a company's sale team, to combine all the wanted input data in one place allowing the sales team to show customers, where switching to them could save them money.
Basically what i want is a program which can save single records, which can hold data added in other text boxes, or indeed take the data from the list view boxes which is the intended output. I want to be able to save that data, then be able to Open it up again at a later date, and even modify it.
enabled me to save the three ways to identify a single record, the index number, company name and the date it was added. However I now need a way to save the data entered in my other forms to these single records.
If I run a MySQL query at the same time I have a timer going, the timer lags, even though the query is on a seperate form. My computer has 8GB of RAM, so I doubt that that's the issue. Does VB stop the timer to run the query intentionally? Is there a way to prevent the timer from stopping/ lagging?
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