Data Logging Application That Stores Data In A Table In A MySQL Database?
Dec 18, 2010
I have a data logging application that stores data in a table in a MySQL database. Data with a TimeStamp is logged into the table anytime the data from the sensor changes. This means that there maybe 2 seconds between data points or there maybe 20 seconds between points depending on how the data is changing.
When I need the data I have 2 dates and use this command to fill a table..SELECT FROM myTable WHERE timeStamp > date1 AND timeStamp < date2 This gets all the data that has a TimeStamp between the given dates, but in most case the first date in the returned table will be after date1, so I need to get the data from one row before the date returned in the table to know what the data was at date1.How can I get the data row that immediately precedes the returned data set?
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Aug 1, 2010
I am trying to create an application where it stores images as well as data.
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Jul 18, 2012
I've made an application and it connects to my database. But the issue is the details of the database can be found out through packet logging or something. How can I stop this from happening and secure it, without having to have a third party such as PHP script etc.
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Oct 22, 2009
I have login system and also I know how to get 1 exact row from mysql but how can I create a table which will be filled with values from mysql table?
[Code]...
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Feb 28, 2011
I am working on a database for a program. I used the .mdf file, created a table, and tried to store data in it.I did not build the program yet. I am still using it on a test drive or debug mode.I added three records to the database.I closed the program for 10 minutes and went back to writing code for it.When I opened up the program again, the database only showed that I had one record.This happened before and after I wrote other code for my program.I only started having the problem today?Is it possible that there is not enough room in the database to store all the records? The variable sizes for 3 of the fields are 400, 500,500, and 1000 and the other fields are like 50 each.All together there are 7 fields. I encountered the error after i had made one of the fields a look up field.In this field, basically I loaded categories stored in an extra files into the comboBox so users can select values without having to retype it.
Can you tell me what the error is and how I can fix it or what I am doing wrong in the program?How do I set up another table and query it to pull the values I want for the comboBox field?
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Jun 9, 2012
My code is the following[code]....
I don't have any errors on the password orr the database!!!I only have errors on the "sqlquary"
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Jan 5, 2012
I am using vb.net with phpMyAdmin MySql database. While running the piece of code below, the program hangs in the for loop before the variables are assigned values from the data table(dt)...
'Check for appraisal period-----------------------------------------------------------------------
Dim sqlCheckDate As String = "SELECT * FROM tblappraisalsetting where appSetID=(select max(appSetID) from tblappraisalsetting);"
[CODE]................
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Feb 27, 2012
i'm using a timer to open a database and drop in a few fields of info, such as date, time and 3 traces.
the timer interval is set to 1000msec, but after its been running for a day or so, i've looked into the data and i can see there are periods where no info has been logged. sometimes its as little as a couple of seconds, and other times its upto a couple of minutes.
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Apr 26, 2009
I have created an windows application which stores it data in a database. What I would like to know is how do I access the tables in the dataqbase and transfer the data in them into textboxes on the forms in my application. I can connect to the database and view the tables, but I have'nt got any idea how to get the data from the fields in the tables into the appropriate textboes on the application forms.
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Aug 9, 2011
I'm using MySQL 5.5 database. I have created a database which only have one table where it stores all sorts of keywords according to categories.
The users key in sentences in the textbox and then I'm suppose to classify the sentences into the category based on the keywords in the database.
How do I loop through the database to compare the strings in the textbox to the keywords in the db?
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Feb 10, 2012
I have a problem inserting data into a table on a MySQL database using a VB.NET application. I have a simple form where when I set some data to the textboxes and I press a GO button, the code should execute a function called InsertCar() that takes all these values and insert them into the database and then return true if the transaction is done successfully or false otherwise. My problem is that nothing is being inserted into the table.
Imports MySql.Data.MySqlClient
Imports System.Data.Sql
Imports System
Imports System.Data
[code]....
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Feb 11, 2012
This is the Query:
DELETE FROM patientpersonal,patientmedical,patientdental
WHERE patientpersonal.'" & dpatientid & "' = patientmedical.'" &
dpatientid & "' AND patientpersonal.'" & dpatientid & "' = patientdental.'"
[code].....
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Sep 19, 2009
How to store string data to mysql table.[code]...
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May 11, 2009
I'm developing a new programme that uses multiple table to store Orders placed via my website, on the form that i have created i have a Combobox that displays the Point of sale name. what i need it to do is when the record is updated in need the Point_of_sale_ID value that matches the name from the Point_Of_Sale table to be put into the Point_of_Sale_ID field on the Sales_Order tableI have added the Foreign Keys for the fields, but i cannot find any help in regards to this, i mainly wor with PHP but have taken on the new challenge of VB & ADO.Net, i have rear several book on the subject and have produced several single table programs but am now stuck!! [code]
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Aug 31, 2010
how to get 1 Thing from a internal DB but. i use a external DB to show the online games. But now the other players must see a list of online games.
vb.net
Dim conn As MySqlConnection
'connect to DB
[Code].....
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Aug 3, 2011
Im trying to fumble my way through selecting data from a mysql table and populating it to a combo box. I feel Im almost there, could someone look over my code and see whats going wrong?
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
Dim con As New MySqlConnection
[Code].....
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Oct 14, 2009
I am create a mysql table with TIME Data type fields. Like FROMTIME and TOTIME. And some insert data to that table. And that data is view through DataGridView. I can show all data in DATAGRIDVIEW. But, Have a error data, when current row click time ( Error data is : DataGridViewTextCell {ColumnIndex=0,RowIndex=0}.
How to store TIME types to Variables or Control;
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Oct 11, 2011
I wanted to used standard TCP/IP connection using MYSQLconnection. Is this the best way?
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Jun 17, 2009
give me a sample code that works when uploading data from access database into MySQL database...
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Mar 15, 2009
At moment iam trying to fetch some data out of a mysql database.hope i can explain well what i try to do.Okay i made a form with some text field and a combobox.What i want is at start when the form loads that all the last name will get catcht out of the mysql database. all those last names should go in the combobox.now i have a few textboxes like adress phone number living place go onWhat i try to do now is when all those lastnames are in the combo box when i select a nameand press the button to update that it will catch the info from that user out of the mysql database and puts the info in the right textfields.What i got so far is a succesfull connection to the mysql database.
How do i know that my login to the application is also connected to the database and that one works fine ;)the only thing i cant manage is to take the data out of mysql and put it in the textfields.i made a form called test to testthis out so far this is what i have on code
[Code]...
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Sep 27, 2010
well this may be a simple question to some but for me, im not even sure where to start. I have never done a program in VB.NET yet that uses a MySQL database. So this should be a fun thing to learn. I looked at an example for access databases and it seemed pretty straight forward. But I must use MySQL as the database is on a Linux server in Ohio.
What I got so far is how to connect to the database using ADODB. Here the example I'm giving. You got 4 col's call AccountNum (primary key), Phone, Name, and Address. For each row is data of a client. What I'm trying to do: the program asks for the account number. You type in the account number of the client. It then
compares it to the rows of AccountNum col till it finds a row with it. Then it asks if you'd like to change the phone number or address.
So what I'm looking for is the, how to call rows and change data in col's.
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Nov 30, 2009
Visual Basic 2008 I want to put data in combo box from MySQL database.
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Feb 22, 2011
Public Sub loadme()
Dim cnString As String
Dim sqlQRY As String
[Code].....
i cant see data inside my datagrid..what should i do?i'm using my sql as my database..
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Dec 21, 2009
I'm looking into creating a program which will on program opening connect to a remote mysql database, download the data and store the data into a local file (keeping both in sync is the idea).
Getting a connection to the remote database is my first hurdle, and i'm not suceeding, i know i need to read through more info but if i could get this working it would help me tremendously.
I have attempted to connect using the mysql connector, using the server IP and port number ie. 199.002.999.000:3306 but it doesnt connect, it does connect locally ie. localhost but for some reason it won't connect to the remote server.
My other problem is that i cannot control the mysql server, i.e connections allowed remote etc, i think they're just enabled to accept connections from the server.
Is there a way to run a hidden browser script behind the scenes, download and run the file? I've tried looking for possible ways to acheive this, but have come up trumps so far.
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Feb 13, 2009
i have a site that is running in php with a mysql db and i want creat a app wiht .net 2008 to return/send values to that database what is the best way to do that? i have think in this options:
[Code]...
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Dec 27, 2011
I used the following code to insert data from my VB.NET into the MySQL database.[code]..
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Jan 23, 2011
I succeed withe the linking and display the data from MySQL DB but the problem is within the DML Commands ![code]...
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Apr 1, 2012
I have an assignment where I have to develop a Windows application using Visual Basic .NET. From the form that I have designed, it should save all records in a table in a MySQL database. How should I do this? Here's what I've got so far:
Imports System.Data
Imports System.Data.SqlClient
Public Class AddMember
[code]....
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Jun 15, 2009
I have added a MySQL Database as a data source in VB using the MySQL .NET connector and added the dataset . How do i write to the database from there?
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Jun 26, 2011
Using: VB 2008 Express?I created an application that connects to my MySQL, and everything works fine, but...
1. On my development computer, Windows 7, 64bit, I add the MySQL.data.dll file as a reference. I publish the program, run the setup.exe, and sucess.
2. I then copy my published folder to my test computer, Windows Vista 32 bit, and upon running the setup, the program fails to work because it cannot find the Mysql reference.
3. I then transfer my entire project over to my Vista computer, publish the program, run the setup.exe, and sucess.
4. I finally found out what was happening. My Windows 7 comptuer was not including MySql.Data.dll.deploy file in the Application Files published directory; but when I compiled it on the Vista machine this MySql.Data.dll.deploy was included.
So, in the end, I cannot compile the program on Windows 7, because it fails to create the .deploy file, and use it on Vista or XP (for some reason Win7 doesn't need this .deploy file?); but I can publish it on the Vista machine and install it fine on Windows 7, Vista, or XP. My targe CPU setting is Any computer.
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