DB/Reporting :: SQL Select Row And Update Recordset?
May 1, 2008
I am trying to use sql to select a row and then find the minimum and maximum values in the row, do some preprocessing, update the recordset using in visual basic 6.0, and then go ahead select the second row, find the minimum and maximum values again.. and go on, until the last row.
The problem is I am having difficulties using sql select for a ROWS.. I am aware how to do this for COLUMNS.. if I want to extract the first row from a recordset, find the min max values, and then, extract the second row and so on.. how will it be possible? (discouraged to use VBA, since i am limited to VB only)..
Here is an example of my recordset:
Code:
Col1Col2Col3Col4Col5
0.43530.05630.74350.92510.0325
0.28430.00320.82430.73250.9981
This example only lists two rows currently. I want to extract the minimum and maximum values from each row at a time, and then the second row. The reason for extracting minimum and maximum values is because I want to normalize my data in the range from 0 to 1.
Logic: After I find the min and maximum values for each row, I will use the recordset back, read the same row, and update every columns entry with my normalized data value... then proceed to the next row and do the same for every row in my database.
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May 2, 2008
I am starting to design in Visual Studio 2008 and I am designing a web application that connects to a SQL database. In VB6 I could create a record set and read its contents as follows.
SQLCommand = "SELECT * FROM Tablename WHERE field = '" & data & "'"
Recordset.Open SQLCommand, Database, adOpenDynamic
If Recordset.EOF = True Then
MsgBox "Record does not exist!", , "Record does not exist"
End If
Then I would Bind the fields data to, say a text box like this
Textbox.Text=Recordset("Field1")
I am finding dificult to do this in Visual Studio 2008. Does anybody know how to create a recordset in Visual Basic 2008 as described above.I have been reading a lot, watching traing videos, and researching on the Internet and I have not found any source which will explain how to do it.
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Jan 6, 2009
I am attempting to run an update query on a Microsoft Access Database File and am not having any luck with the update. It appears to update the RecordSet but not the actual Access Database (when I run the following code, close the debug window, then re-open it a field referring to the Count_Value column reflects the update). I am using Microsoft Visual Basic 2008 Express to work with this code, if that is of any interest. If you could look through the code below and see what is causing the RecordSet to update but not the actut
Code:
Dim strDBpath As String
strDBpath = Application.StartupPath & "CourseData.mdb"
[code].....
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Apr 20, 2011
I have a piece of software I am converting to ADO.NET from ADODB. In ADODB I can update a recordset by simply.
Dim rs as ADODB.Recordset
rs = query("select * from tblSomethere where something = something")
rs("something").Value = something.Text
rs.Update()
OR IF I WANTED TO ADD
Dim rs as ADODB.Recordset
rs.AddNew()
rs = query("select * from tblSomethere where something = something")
rs("something").Value = something.Text
rs.Update()
I am confused about to easily accomplish this. I know I can use an insert or update command but it would be much easier to do something like this. NOTE: The query just returns a filled RecordSet, it just executes the command and connection without me having to do it all over the place.
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Nov 25, 2008
I'm having a problem with my Access database.I have to select the highest ActieAantal before the last action ( )because the last action is always the sum (Totaal).this is a part from my table
Persoonid..........ActieAantal..........acties..........Actieid....... ...datum..........aantal..........totaal
.......... 3 ................ 1 ................... aa ................. 99 ........ 31/12/1975
.......... 3 ................ 2 ................... bb 94 ............. 98 ....... 31/12/1975 ........ 94
.......... 3 ................ 3 ................... cc 10 ............... 5 ....... 17/03/1989 ....... 10
.......... 3 ................ 4 ................... dd 20 ............... 2 ....... 25/08/2003 ....... 20
.......... 3 ............. 999 ............. totaal = 124............. 9 . . . . . . . . . . . . . . . . . . . . . . . . . 124
The next person also has some acties with corresponding Actieid and a Total when I use this query I alway get the 999 values
SELECT Register.Persoonid, Max(Register.ActieAantal) AS MaxVanActieAantal
FROM Register
GROUP BY Register.Persoonid
ORDER BY Register.Persoonid, Max(Register.ActieAantal);
but when I try to exclude the 999 value I get nothing
SELECT Register.Persoonid, Max(Register.ActieAantal) AS MaxVanActieAantal
FROM Register
GROUP BY Register.Persoonid
HAVING (((Max(Register.ActieAantal))<>999))
ORDER BY Register.Persoonid, Max(Register.ActieAantal);
find the highest 'ActieAantal' after excluding the 999 values?
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Jun 28, 2011
Not sure if this is possible but can you use the select statements in VB to pull in from not just one but multiple tables and put the data in a gridview? [URL]
Code:
Imports System.Data
Imports System.Data.SqlClient
Public Class Form1
[Code].....
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Dec 29, 2008
I'm using Vb2005 and Db MS access Is it possible to use tow Select in same sql Statement like this example:
Code:
"Select....Select......."
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May 11, 2008
I want to take a drop down menu. It will contain LastName, FirstName. I want that to select a record from a table. First Name and LastName are two different columns
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Jun 3, 2009
Im new to database programming and was wondering if you can save a select statement to an array:I tried this but obviously wont work, does anyone have any ideas?
Code:
Public Sub store_select_star_to_array()
Dim myCommand
[code]......
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Feb 25, 2008
Ive got a web page so that the users select a day from the calendar and the date is input to a text box, the format is dd/mm/yyyy, it is the same format in the database table.
I want to select the data from the database when it is = the date in the text box but it is retrieving data in mm/dd/yyyy format. My sql is:
SELECT Booking.Date, Booking.RoomNo, Booking.Lesson, [NoComps] - " & students & " AS diff FROM Rooms INNER JOIN Booking ON Rooms.RoomNo = Booking.RoomNo WHERE booking.Date= #" & txtdate.Text & "# AND booking.Lesson = '" & lessonlist.SelectedValue & "' AND booking.Type IS NULL
how can i make sure it retrieves the data using the correct date format?
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Nov 1, 2010
I need to filter a measurements table that consists of 63 measurement objects that may or may not be tested more then once. The entries are put in a Batch table on a SQL server in the following fashion:
ID: | Serie | Test object | Min Amps | Max Amps | OK?
DateTime| String | Integer | Double | Double | Boolean
So there may be multiple entries in my database with the same series and testobject number but with (slightly) different results.
Currently I just select: SELECT * FROM Measurements WHERE Serie = 'XXXX' and use a datareader object to fill a datatable and then I let loose a routine on it that will either: Get the last result that produced a good measurement, so OK = 1 and max ID. Or the last result that produced a bad measurement if there are no good ones. I then end up with a list of 63 either good or bad measurement objects with the last good result, and if there isn't one then the last bad result.
Now I know that SQL is quite powerfull and I suppose that it must be possible to directly query for these results without a programatical routine re-filtering the results. I suppose it's like Selecting within a select statement..
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Nov 18, 2009
I already have a problem..
Im trying to get the soft recognize the timerange between times:
For example:
START TIME: 10:00
[Code]....
I need to pick the time range between 10:00 and 05:00 in the morning.
I tried both - SQL Select and Visual Basic - both options didnt work when I needed to pick the time range as above. Normal ranges during the 24 hour cycle where ok.
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Dec 6, 2008
I have a stored procedure that I need to be able to change the table name that the select statement in the stored procedure uses depending on a user input, however I am having a problem with the code:
Code:
CREATE PROCEDURE [dbo].[spQryParentComments] @projTable as varchar(50)
AS
[code].....
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Apr 7, 2012
I'm just a frustrated noob trying to get past my first DB Program. My goal is to get relational data from different tables all ordered by a certain field..Ive noticed early on that i cannot select a column when its name has a space.[code]Now the statement i want to use is sql = "SELECT [PT.Chart Number],[PT.Last Name],[CA.Case Number] FROM Table1 AS PT INNER JOIN Table2 AS CA ON PT.Chart Number = CA.Chart Number ORDER BY PT.Chart Number"..When i Debug i get the same type of error ("... Can't find column name PT.Chart... ")I'm new to sql so i dont know if my syntax is off.
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Apr 6, 2009
I have a database and I wanna select a field ..I usually do this with access:
dim chosen as string
chosen = textbox1.text
Dim querysql = "select * from table where field = " & chosen & ""
But with SQL it doesnt work =S I really need to make this work .
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Jul 22, 2010
I am attempting to migrate from vb6 to vb2k8. My first attempt is a program with three forms. The first form extracts data from Oracle into a local Access DB. It works great but the second form only pulls data from Access to generate a text file. The VB6 version does it in 10 minutes, the VB2k8 version gets 1/10th through the data in two hours. It is hanging on:
"select sum(hrs) as thrs from tablename where emp_id_no='xxxxxx' and hours_type='CE' and org_ofc_sym='oos'"
I have to hide identifying fields but the emp_id_no and oos are correct.
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Sep 14, 2009
I am very new to VB.net express and I am getting confused as to what does what. I have to work with DBF files (clipper/ Dbase iii or iv) I have code to create a new DBF file with a reference to ADOX. The code example seems to work. I can open and display a dbf file (from a clipper application) using an oledb.connection This allows me to fill a dataset and bind to and display a grid view. I have yet to succeed in updating the source dbf file.
Does ADOX do anything for me beyond creating a new DBF file?The DBF file is unsorted and not otherwise indexed. For the data massaging and manipulation I may use a temporary sort but the data relations do not need that and the tables are not related.That being said, it appears that the data wizards or command builder will be of little use.
[Code]...
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May 12, 2010
Today i have been checking out the concept of datasets and i like the way they work except for a minor issue i have with it.The following code should get a databasetable and put it in a dataset and return that set to the user.[code]I submit the table name and it will select it, read it and fill the dataset with it, then return it. And it does exactly that once.If i try to re-read the same datatable it just returns the exact same dataset as the first time yet i am 100000% sure that i changed it .
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Apr 23, 2008
This is the only code I could find and it doesnt work:
Private Sub DataGridView1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles DataGridView1.MouseUp
Dim pt = New Point(e.X, e.Y)
[Code]....
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May 23, 2009
i'm using vb 2008 express editor, and 3.5 compact sql, through my program, i make changes, like altering rows, deleting or adding new rows, to a dataset. i want, that when button 1 is pressed, all changes made to that dataset, are updated to my database. what is the line of code that does this? [Code]
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Oct 29, 2009
Well here I am again, could really use some expert eyes on this. I've got an update statement for access 2007 and when I run it it's giving me a "No value given for one or more required parameters." error. I've spent at least 2 hours on this now and searched all over the place and none of the suggestions I found are fixing it. I've got an insert statement to the same table that works fine, I took this same syntax for the update statement from another project where it was working perfectly. I've verified the spelling of the table and column names, As best as I can tell there are no reserved keywords being used and I've eliminated any spacing from the names. I've even tried updating a single row with no variables, just like for like data directly from the table and it still throws the error.
Code:
Dim DAEdit As New OleDbDataAdapter
Dim update As New OleDbCommand("UPDATE ActiveContracts " & _
[code].....
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Apr 18, 2008
My problem is once I filter my datagridview I cant seem to be able to update the database. The error I get is Concurrency violation: the Update Command affected 0 of the expected 1 records. Why is it that I cant update after i filter????
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Apr 25, 2011
I have an application which upon a save button needs to save data to 8 different tables. 7 of those tables will have multiple new records added to them, while 1 will have just one new record. I want to encapsulate this giant Insert operation in a Transaction so that it will not complete unless I can save successfully to all tables.I have considered using Insert commands to a command statement, but adding what amounts to like 50 parameters, and the fact that using a parameterized query means it becomes very difficult to troubleshoot problems such as invalid values in the SQL statement (since I cannot figure out what the statement looks like with values in it
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May 30, 2009
I'm trying to update an MS Access database, but that doesn't seem to work. I do NOT get an error, but nothing changes in the database.
Code:
Dim myCommand As OleDbCommand = Nothing
Dim strUpdate As String
strUpdate = "Update Settings Set Data = @Data Where Name = @Name"
[Code].....
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Aug 27, 2009
I�m trying to make a simple database editor using DataGridView.I have one DataGridView containing a lot of data on products and some parameters on how they should be tested. Some of these parameters, for example "Test method", is just a number. But if I look in the table for Test Methods that number has lots of other parameters. So if I select a "Test Method" Cell and click a button that table opens in a new form with just that "Test Method" (if I for example have selected a cell with the number 1, Test Method 1 will be shown in the new form). So far everything I�ve said works. I can even change values and update it to database in the first "Products" table. So here is the problem The DataGridView that shows the products is bound to a table and always shows the same thing which makes it easy to change and update using the following code
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Me.INPUT_PRODUCTSTableAdapter.Update(Me.TestPlattformDataSet)
Me.TestPlattformDataSet.AcceptChanges() End Sub
This will change later when I add a search function. Then this will need the same modification aswell. The DataGridView thats shows the other parameters can�t be updated using just this code cause I get an error that says
"InvalidOperationException" "Update requires a valid UpdateCommand when passed DataRow collection with modified rows."
It seems like the problem is that because I change the data under run its not really bound to the database. And I haven�t found any complete solution to this. I have found some similiar problems and it seems I need to update each row using the command
TableAdapter.Update(DataRow)
Here follows the entire code for showing the Parameter Table in a DataGridView. This does not work.
Public Class Form3
'ID is the value from the cell selected in the Products table
Dim ID As Integer
[code]....
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Nov 11, 2008
Visual Studio 2008Visual Basic / .NET Framework 3.5I am developing an application to access data from multiple tables.Example Tables:- BaseInfo - Terms - OtherPeripher
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Jul 15, 2009
How do you change an ADODB recordset to ADO.Net recordset?
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Sep 24, 2011
anyone knows the query of selecting from monthname and year(September 2011) from mysql database DATE format(yyyy-MM-dd)
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Jan 29, 2010
I am using the following Select Statement to retrive data from my .csv file database:
Code:
Dim comm As New OleDb.OleDbCommand("Select *, Left([Street Full Address], IIF(InStr(12,[Street Full Address],'-')>0, InStr([Street Full Address],'-')-1, Len([Street Full Address]))) as StreetFullAddress From " &
[Code].....
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Sep 16, 2011
I need this for displaying in my crystal report here's my code:
Code: cmd.CommandText = "Select * from pos where date= '" & datetimepicker1.text"'" and nothing displays on my crystal report, I need the right query for that...the field value is DATE...I need the conversion for the 1/11/2001 format from date time picker to 2001-1-11 in DATE field
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