|
is it possible to display in client side
|
|
|
|
|
I would again say, you should not let that null date to reach your DB. Check it beforehand. For other exception, you can have something like this:
You can use try/catch in your stored procedure. Then, if it fails, you should send the exception back to your data access layer. That or business should inturn change the message to a user friendly one. Also, before doing this make sure you log it in somewhere for future reference.
Once your message has reached UI layer, use MessageBox or Alert as applicable.
In order to understand ho try catch works in SQL, use google and you will find a lot of help.
50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!
|
|
|
|
|
Only through your client application.
Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP
|
|
|
|
|
If this is required for debugging purpose, you can use the print statement, or if you want to notify your application users, you need to pass an appropriate value to the client and show the popup in the client application (such as a WinForms Form or an ASP.NET page).
|
|
|
|
|
Hi All,
I Developed an Application in vb.net 2005 using sql server 2005 express. So far I installed in single PCs and is working fine.
But now i want the application to be access by client PCs but update the SQL database on a centralized server PC.
e.g. MASTER_PC will have the SQL database & the main application will run on PC1, PC2 and PC3; so that users can access the database from their respective PCs.
Overall to say, I just need a central location where the SQL database can be stored, and all employees can run and modify the database through their application via internet/LAN(or some other source)
Please suggest me how to go ahead with this:
1) As I have 4 PCs in my office, Do i need to create a LAN ?
2) Do I need to do any major modifications in my application?
Any links/tutorial/references will be highly appriciated.
Thanks
R.S.
|
|
|
|
|
For your connection string, it's easiest to troubleshoot a client if you use DSN connection as opposed to ipaddress. I am not sure if you need to create a LAN since I have always set these up when I already had a LAN.
If you've already networked your PC's, then the main step is modify the system DSN on each pc. This can be done by modifying registry settings or through odbccad32.exe. I am assuming that you will want to call your database by name. With Oracle, you also might create a TNSNames file. This is not necessary for SQL Server. Clients can access the database when the login with VPN or are on your network at the office.
Assuming that your have a Major modifications to your application should not be necessary.
|
|
|
|
|
1. Aren't your 4 PC's on a single network? If they are, all you need is to set up your server to allow remote connections. Then all your PCs should be able to connect to your database.
If they are not on same network, but all are connected to internet, still you can connect to your database. Here[^] is a link to help you.
2. I don't think the code would change.
50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!
|
|
|
|
|
Hi guys, I'm relatively new to databases and have been playing with SQL Server 2008 Express for some time. I want to build a database on stock prices and various other stock-related indicators across time. So basically it's going to have three dimensions: name of the stock, stock attributes, and time. The user will be able to query for certain stock's performance on a particular attribute across a designated time period.
Normally this would be a perfect job for OLAP (multidimensional database). However, due to financial constraint and other reasons  , I am not considering OLAP at the moment. With my limited knowledge on databases, I think I could achieve the above by using:
1) Relational database: if I need to track 1000 stocks, I will construct 1000 tables, with time and stock attributes on each stock table.
2) XML: I am relatively new to XML too, but it seems that with some clever XPath/XQuery coding, dumping all the data into one huge XML database is not a bad idea (or is it?), as long as data can be effectively retrieved.
In terms of speed/performance, maintenance convenience, and server-memory efficiency, which of the above two is a better choice? Or do I really need to migrate to using OLAP?
Sorry if this is a simple question, I am a total newbie regarding databases. 
Thanks in advance!!
|
|
|
|
|
I strongly advise against 1,000 tables. This is not a scalable solution and many of your queries will take a very long time as you will need to join many tables.
|
|
|
|
|
I wouldn't store similar information on different stocks in different tables, just the one table with a field added to identify the stock would be fine. It would be able to provide more functionality with less code, as you can now easily search/list over many stocks, and never need to enumerate the tables.
|
|
|
|
|
Thanks for the replies guys. But if I add a field to identify the stocks, it would be one huge table and it won't look as elegant.
By the way, are you suggesting the following structure:
Time StockName Open High Low Close EPS Dividend Return% ... ... ...
1/2/07 Citi 20 23 19 20.5 5m 5 4% ... ... ...
....
....
....
11/25/09 Citi 4 5 3 4.5 2m 2 -10% ... ... ...
1/2/07 BofA 35 37 32 36.4 7m 10 7% ... ... ...
....
....
....
11/25/09 BofA 12 13 11 10 3m 1 -7% ... ... ...
1/2/07 MSFT 45 47 41 42.5 28m 3 7% ... ... ...
....
....
....
11/25/09 MSFT 4 5 3 4.5 2m 2 -10% ... ... ...
If this is true, assuming that the table will contain 1000 stocks with 50 attributes for a 3-year period, this table will need to contain: 1000 x 50 x 260(business days) x 3 = 39,000,000 stock prices. Is this a little bit too large for one table? (If it is, as an alternative perhaps I could break 1000 stocks down into several smaller tables based on the market in which they are traded in? So one table for each market. What do you think?
Thanks!
|
|
|
|
|
James Shao wrote: are you suggesting...
yes I am. I haven't done this with millions of records, my DB apps aren't large, but yes that is what I would do. I avoid tables with identical structure, I only use one Persons table, one Vehicles table, etc.
|
|
|
|
|
Thanks a lot, I'll give this a try and come back if I've encountered errors.
|
|
|
|
|
My databases ARE in the millions of records, Luc is correct have 1 structure with all the information. Do not store any data twice (database design 101) eg is you are have industry or sector for an equity then have an equity table with the static data and a related table with the tick information.
If table size becomes an issue there are many better option than splitting by stock name. Partitioning by time is a better solution (partition by year would do). Doesn't express include analysis services (have not checked)
Never underestimate the power of human stupidity
RAH
|
|
|
|
|
Breaking it down by market is not a good idea, but you do need to know what market something traded on. A single stock may trade on multiple markets in the US, even when you ignore after-hours trading and dark pools.
I've personally worked with global financial databases with billions of records. The DBA sets the appropriate indices and partitions and performance was fine.
What you do not want to do is design something fragmented where it is hard to change the structure later without losing your data.
As far as memory usage, you can use SELECT statements and limit the amount of memory that sql server will use. So if you have a 10 GB table, you can tell sql server not to use more than 500 MB of RAM for instance.
|
|
|
|
|
Hi Ted, thank you for the suggestions. I also feel that fragmenting the data is not a good idea. But if I dump them all into one table, that would create big redundancy in the date column (my 1st column), since I'll need to repeat it for every stock I have in my database. Is this okay?
Thanks!
|
|
|
|
|
Yes, you should use the date in your table (which is 4 bytes). If you created another table holding dates to try to reduce the size, then you would have an additional bottleneck.
Your primary key will be composed of multiple columns including ID, Date, and possibly source/exchange. If you really needed to save space in your table, you could use a smallint (2 bytes) for your date and map the minimum small int to Jan 1, 1970 or wherever you will start your database. Then it will be quick to add/subtract an offset to go back and forth from Excel's date format.
|
|
|
|
|
Thank you Ted, I'll give it a try and see how it goes.
|
|
|
|
|
hello all.
I want to validate category name before insert all information about category into database.
The following condition is the way i want to compare:
Ex: ------------------------------------------------------------------------
| name in TblCategory | name in Text box | comparative result |
------------------------------------------------------------------------
| white bag | whitebag | existing |
------------------------------------------------------------------------
| whitebag | white bag | existing |
------------------------------------------------------------------------
| White Bag | white bag | existing |
------------------------------------------------------------------------
I use this following function in sql database:
BEGIN
IF EXISTS(SELECT TOP 1 *
FROM TblCategory c
WHERE (c.c_name=@name OR c.c_name=REPLACE(@name,' ',''))
AND c.c_id <> @id
)
SET @result=1
ELSE
SET @result =0
END
this give me bad result if TblCategory (white bag) and TextBox to compare has word(whitbag)...this can't compare to me
|
|
|
|
|
I already answered your question in the other forum. Don't cross post. Please follow the post from there.
|
|
|
|
|
Hi All,
I have a SQL database column "ID", in which I added one by one entries as 2,5,6,1,8... randomely.
I want to arrange these entries in Ascending order so that in datagridview it get displayed in order 1,2,3,4... like this.
Can someone help me on this?
|
|
|
|
|
Ever tried the ORDER BY clause?
Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP
|
|
|
|
|
Try this
declare @t table(id int)
insert into @t
select 3 union all
select 1 union all
select 5 union all
select 4 union all
select 2
Query:
select * from @t order by id
Output:
id
1
2
3
4
5
Niladri Biswas
|
|
|
|
|
I have already inserted "EmpID" as 1,2,3,4,5,6,7,8,9,10,11,12. But when i see the column data of table, i found that the data is arranged like this:
1
10
11
12
3
4
5
6
7
8
9
Since, the data is already inserted in the above order, i found that in crystal report the same format is coming...but i want the order in exactly ascending order in report finally, if not possible in database.
Can someone help me on this?
|
|
|
|
|
What's a good way to modify a large number of stored procedures? I took over a project that is not using SET NOCOUNT ON, i.e. the following query returns several hundred rows.
SELECT Distinct SO.Name, SC.TEXT
FROM sysobjects SO (NOLOCK)
INNER JOIN syscomments SC (NOLOCK) on SO.Id = SC.ID
AND SO.Type = 'P'
AND SC.colid=1 --multiple colid's are utilized when the procedures text is very long
AND NOT UPPER(SC.TEXT) LIKE '%SET NOCOUNT ON%'
ORDER BY SO.Name
modified on Friday, November 27, 2009 2:17 AM
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
