Re: 2 people create new record in datagridview on dataset, both save, last to save gets primary key violation - fix? - Database Discussion Boards

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Re: check all values in select qry

Colin Angus Mackay17-Jun-09 23:00

Colin Angus Mackay

17-Jun-09 23:00

kripa ostwal wrote:
I have car entry screen, in which user can insert a car details such as number, color, model etc. & amenities (select multiple for 1 car).
Now search screen, when user selects aminities from list., I want to show only those cars who have all selected amminities.

Assuming your question is: How do I do that?

You are going to have to show us the data model. We cannot help you construct a query without knowing what the data actually looks like (what the user can do on the front end isn't so useful as it may not match the data model)

Re: check all values in select qry

kripa2117-Jun-09 23:30

kripa21

17-Jun-09 23:30

I have database with carMaster,AmenityMST & carAmm.

CarMST

carCode carNumber color
1 MH12-KO1212 blue
2 MH42-jk1234 red

AmenityMST

ammCode ammName
1 mobile charger
2 video coach
3 AC

carAmm
carCode ammCode
1 1
1 3
2 2
2 3

Now I want, when user search car with 'video coach' & 'AC', he should get only 1 car i.e. 2
I used
"select carCode from carAmm where ammCode in (2,3)"
but it returns me both cars, even car have not 'video coach'

Re: check all values in select qry

Colin Angus Mackay17-Jun-09 23:45

Colin Angus Mackay

17-Jun-09 23:45

kripa ostwal wrote:
where ammCode in (2,3)

That is because you are asking for any cars with ammCode of 2 OR 3.

Try a join instead between two result sets.

First set:
SELECT carCode from carAmm WHERE ammCode = 2

Second Set:
SELECT carCode from carAmm WHERE ammCode = 3

Something like this:

SELECT c1.carCode
FROM carAmm AS c1
INNER JOIN carAmm AS c2 ON c1.carCode = c2.carCode
WHERE
c1.ammCode = 2
AND
c2.ammCode = 3

Re: check all values in select qry

kripa2118-Jun-09 0:00

kripa21

18-Jun-09 0:00

s, bt i wrote store procedure for it coz there will be n number of aminities in future for search criteria.
& I passed a string as '2,3'
Can I split it in store procedure & create joins?
or any other way to do this?

Re: check all values in select qry

Colin Angus Mackay18-Jun-09 0:05

Colin Angus Mackay

18-Jun-09 0:05

kripa ostwal wrote:
s,

kripa ostwal wrote:
I passed a string as '2,3'

If you are using SQL Server 2008 you can pass tables. That way you have no crazy string manipulation to get the data you need.

kripa ostwal wrote:
Can I split it in store procedure & create joins?

Yes, but the splitting operation is a PITA.

kripa ostwal wrote:
or any other way to do this?

You must already be using dynamic SQL, so just variations on a theme (unless you are using SQL Server 2008)

Re: check all values in select qry

kripa2118-Jun-09 0:14

kripa21

18-Jun-09 0:14

i m using sql server 2000 with asp.net

2 people create new record in datagridview on dataset, both save, last to save gets primary key violation - fix?

sherifffruitfly17-Jun-09 13:57

sherifffruitfly

17-Jun-09 13:57

I'm certain this is about as noob-ish as it gets, but I'd like to know what typical solutions to this issue are.

2 people (on two computers) get passed their own dataset instances, representing 1 table in the database. They both want to add a row to the db table. They both click on the new row in the datagridview, and it happily inserts a new row on their monitors, with a new Primary Key value (identity column). Problem is, the number is the same on both computers. So the first person can save just fine, but the second person naturally receives an PK violation error when he or she saves.

How is this issue supposed to be dealt with (i.e. avoided)? Avoid creating the PK value at all on the client side,allowing the database to create the PK when insert has been performed, and just refresh the datagridview with that value (created by the database)?

Some other approach?

Thanks for ideas,

cdj

Re: 2 people create new record in datagridview on dataset, both save, last to save gets primary key violation - fix?

Colin Angus Mackay17-Jun-09 14:47

Colin Angus Mackay

17-Jun-09 14:47

I generally avoid PK creation on the client-side. The database alone should be responsible for that. However, if that isn't possible, then my next preferred solution is to use a GUID. That way the two machines will generate different numbers.

Of course, your DBA may baulk at the use of GUIDs as the data will be inserted randomly (and since the PK is often the clustered index, that can slow the performance of the database if you are doing a lot of inserts or do searches on sequential [or near-sequential] ranges of PK values)

Re: 2 people create new record in datagridview on dataset, both save, last to save gets primary key violation - fix?

sherifffruitfly17-Jun-09 14:51

sherifffruitfly

17-Jun-09 14:51

Yep - as I was typing the question, I realized that the answer was to simply not create the pk client side.

Smile | :)

Thanks!

cdj

SQL Server Backup and Restore questions

Hypermommy17-Jun-09 8:43

Hypermommy

17-Jun-09 8:43

Hi all,

I need to make a copy of a SQL Server (2000, I think) database and a friend told me the easiest way to do this was to back up the database and then restore it to a different name. Does anyone know a good source for a step by step guide on how to do this? The database I have to back up is a production database and then I'm going to restore it to a different name to make a test copy of it and I'm just nervous working with production stuff. So a step by step guide would be very helpful.

Also... if the hosting provider is backing up the server every night, does that also back up the SQL Server database? I'm just wondering if I need to tell him some specific steps to backing up the database, but if backing up the whole server does the trick then I don't need to.

Thanks!

Denise "Hypermommy" Duggan

Re: SQL Server Backup and Restore questions

Colin Angus Mackay17-Jun-09 14:53

Colin Angus Mackay

17-Jun-09 14:53

Hypermommy wrote:
The database I have to back up is a production database and then I'm going to restore it to a different name to make a test copy of it and I'm just nervous working with production stuff.

You should be restoring it onto a non-production server. That way you are isolated from the production server and it would be near impossible to damage the production system while you were working on your newly created test/development system.

Hypermommy wrote:
Also... if the hosting provider is backing up the server every night, does that also back up the SQL Server database?

Most likely, but that is a question for your hosting provider.

SQL Backups work differently from file backups because the SQL Server will be on-line and modifying its files. The hosting provider would have to be taking specific SQL backups. They are likely to be doing this already.

Re: SQL Server Backup and Restore questions

Hypermommy30-Jul-09 1:13

Hypermommy

30-Jul-09 1:13

I appreciate it. Yes, ideally I'd be using a different server. Unfortunately, with this client that's not do-able. It's something I hope to be able to convince them of the necessity of in the future but for now.....

As far as SQL Server being backed up... I doubt it. If they have to do something different from a regular Windows backup then I don't believe it's happening. Just something else I need to talk to them about.

Figuring that the hosting provider (a small company) is not doing a separate SQL Server backup, is it possible to point me to some quick literature of just a couple pages that I could send him to say "do this"?

Denise "Hypermommy" Duggan

"Make sure you have not released a resource before attempting to use it". HELP!!!!

ChiSmile17-Jun-09 7:26

ChiSmile

17-Jun-09 7:26

Hello there!
My code is highlighted below.I have five tabpages(two is shown here!) on a form called vwpatient that runs each time a tabpage is selected.The code below works but my problem is this: there is a textbox called sachPatient.patID from another form called sachPatient, the code pulls data from the database on clicking one or two pages, but if more than two is clicked, an exception fires saying "Make sure you have not released a resource before attempting to use it". I have tried endlessly to fix this problem to no avail. And am still trying!!.
I would appreciate if someone can help me.
Thanks in advance!!!

Private Sub TabControl1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles TabControl1.SelectedIndexChanged


For Each tabcont As Control In Me.Controls
            If TypeOf tabcont Is TabControl Then
                For Each tp As Control In tabcont.Controls
                    If TypeOf tp Is TabPage Then
                         Select Case tp.Name
                            Case "vwProfTabPg"

                                Try

                                    LoadData()
                                    ' Configure and execute the command.
                                    cmd = New System.Data.SqlClient.SqlCommand("SELECT * FROM Patient_profile where patient_Id = @Pat_ID")
                                    cmd.Connection = cn
                                    Dim paraPatId As SqlParameter = cmd.Parameters.Add("@Pat_ID", sachPatient.patID.Text)
                                    ' Load the DataTable.
                                    datadapt = New System.Data.SqlClient.SqlDataAdapter(cmd)
                                    datadapt.Fill(ds)
                                    ds.Tables.Add(dt)

                                    ' Bind the DataGrid.

                                    vwProfDG.DataSource = ds.Tables(0)
                                    vwProfDG.Visible = True

                                Catch ex As SqlException
                                    MsgBox(ex.Message.ToString())
                                Finally
                                    cn.Close()
                                End Try

                            Case "vwLabTabPg"
                                Try

                                    LoadData()

                                    ' Configure and execute the command.
                                    cmd = New System.Data.SqlClient.SqlCommand("SELECT * FROM lab where patient_Id = @PatLa_ID")
                                    cmd.Connection = cn
                                    Dim paraPatId As SqlParameter = cmd.Parameters.Add("@PatLa_ID", sachPatient.patID.Text)
                                    ' Load the DataTable.
                                    datadapt = New System.Data.SqlClient.SqlDataAdapter(cmd)
                                    datadapt.Fill(ds)
                                    ds.Tables.Add(dt)

                                    ' Bind the DataGrid.

                                    vwLabDatGrid.DataSource = ds.Tables(0)
                                    vwLabDatGrid.Visible = True

                                Catch ex As SqlException
                                    MsgBox(ex.Message.ToString())
                                Finally
                                    cn.Close()
                                End Try
                        End Select
                    End If
                Next
            End If
        Next

Re: "Make sure you have not released a resource before attempting to use it". HELP!!!!

Colin Angus Mackay17-Jun-09 15:01

Colin Angus Mackay

17-Jun-09 15:01

nedusmile wrote:
if more than two is clicked, an exception fires saying "Make sure you have not released a resource before attempting to use it".

On what line of code is this exception being raised?

Also, this exception does not sound like a SQL exception to me, it sounds more like you are attempting to use an object that's been disposed. That being the case, this is not a database question and you would be more likely to get the assistance you need if you posted in the correct forum (e.g. .NET Framework or VB.NET)

varchar

zeeShan anSari17-Jun-09 4:03

zeeShan anSari

17-Jun-09 4:03

hi all,
let suppose :
@ch = ''

what does it's means
it is null
it is empty
it has some value

if i use ch as
.........
............
...
case
@ch
when '' then .........
...........................

i want run above case statement than what would be value of ch when i execute the SP from winform

Re: varchar

Tim Carmichael17-Jun-09 5:11

Tim Carmichael

17-Jun-09 5:11

I would read that as ch has a value of the empty set; it is a zero length string.

Re: varchar

Ashfield17-Jun-09 9:02

Ashfield

17-Jun-09 9:02

In youer example @ch would be an empty (zero length) string. If you want it to be null then

SET @ch = NULL

Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP

Re: varchar

Niladri_Biswas17-Jun-09 20:37

Niladri_Biswas

17-Jun-09 20:37

a string of length zero
Smile | :)

Niladri Biswas

Columns renaming

jonhbt17-Jun-09 2:57

jonhbt

17-Jun-09 2:57

Hi I need to create a stored procedure that changes the column name of a column in a datatable. Can someone help please? Thanks

Re: Columns renaming

Jerry Hammond17-Jun-09 5:20

Jerry Hammond

17-Jun-09 5:20

You might want to give more information. As it is, changing the name of a column as you have it stated would be a one time operation.

Alter Column [column_name]

"My interest is in the future because I'm going to spend the rest of my life there." - Charles F. Kettering

Re: Columns renaming

Niladri_Biswas25-Jun-09 5:28

Niladri_Biswas

25-Jun-09 5:28

There is a stored procedure available in the System Stored Procedures in

Sql Server. It is called sp_rename

It accepts 3 parameters viz.

@objname	nvarchar(1035),		-- up to 4-part "old" name
@newname	sysname,			-- one-part new name
@objtype	varchar(13) = null	-- identifying the name

For renaming a column, execute the following

EXEC sp_rename 
@objname= 'TABLE_NAME.OLD_COLUMN_NAME', 
@newname = 'NEW_COLUMN_NAME', 
@objtype = 'COLUMN'

N.B.~ For your reference, the @objecttype correspond to
system tables which track of the folowing type:
'column' 'database' 'index' 'object' 'userdatatype'

Hope this helps
Vote me
Smile | :)

Niladri Biswas

List values in vertically

yesu prakash16-Jun-09 23:52

yesu prakash

16-Jun-09 23:52

Hi,
How to return value in the following format

Name Name Name Name
N1...N2....N3....N4
1....2 .... 4 ....7
3....1 .... 8 ....7
4....8..... 5.... 7
7....5......3.....8

the numbers can be consider as the list of tokens for the N1,N2..etc
The table structure is
N1.1
N1.3
N1.4
N1.7
N2.2
N2.1
N2.8
N2.5
N3.4
N3.8
N3.5
N3.3
.
.
.

Thankyou
YPKI

Re: List values in vertically

Mycroft Holmes17-Jun-09 0:00