Database

31-Aug-07 13:30

Ok, this will be very hard to explain since I haven't personnally seen this myself.

I have a web site programmed with an Access database as the backend database. All has been working for over 3 years. Recently the employees are saying they are changing things in the database, both through the table itself, and through forms in the database(horrible I know, but my employer will not pay me to write all that code). But they say that SOMETIMES, it doesn't save the changes, which contradicts both computers with the sometimes, and Access since it writes constantly.

Has anyone seen this happen before? Know of a fix? Anything?

I have checked to see that there is enought disk space, and that they have sufficient privilages. ANY help at all, leads, ideas, absolutly anything, will be greatly appriciated.

The best way to accelerate a Macintosh is at 9.8m/sec² - Marcus Dolengo

Vasudevan Deepak Kumar1-Sep-07 1:21

Vasudevan Deepak Kumar

1-Sep-07 1:21

Is the MDB file in the folder which is writeable by the process?

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

Expert Coming2-Sep-07 17:45

2-Sep-07 17:45

Yes, my code all works as far as C#. Is is when the users are actually in the database using its forms and tables.

The best way to accelerate a Macintosh is at 9.8m/sec² - Marcus Dolengo

Paul Conrad2-Sep-07 5:34

Paul Conrad

2-Sep-07 5:34

Expert Coming wrote:
through forms in the database(horrible I know, but my employer will not pay me to write all that code)

I can relate to that from a few experiences out there.

Expert Coming wrote:
say that SOMETIMES, it doesn't save the changes, which contradicts both computers with the sometimes, and Access since it writes constantly.

Is there any kind of record-level locking going on? Access can let you turn such a thing on and off...

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Expert Coming2-Sep-07 17:46

2-Sep-07 17:46

Not sure, it would be the default which I am sure is locked. Do you know what the default is?

The best way to accelerate a Macintosh is at 9.8m/sec² - Marcus Dolengo

Get Max of a column from database

Paul Conrad3-Sep-07 5:48

Paul Conrad

3-Sep-07 5:48

I think the default is set to No Locking. Or your problem could be something completely different, though.

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

.NET_Labview31-Aug-07 10:32

.NET_Labview

31-Aug-07 10:32

hello all,

i am working on a application to get the last updated date for a table. the date is already in the table in the UPDATE_TIMESTAMP column. Now the following code is not getting the result for me. can anyone help? I am getting an insufficient priviliges error

public static string GetLastUpdateTime()
{
StringBuilder sb = new StringBuilder();
sb.Append("SELECT MAX(updated_timestamp) lastUpadateTime FROM TABLEA");
OracleHelper oracleHelper = new OracleHelper();

string sql = sb.ToString();
object obj = oracleHelper.ExecuteScalar(Utility.GetConnectionKey(),CommandType.Text,sql);

if (obj == DBNull.Value)
{
return "";
}

return ((DateTime)obj).ToString("mm/dd/yyyy");
}

Re: Get Max of a column from database

Expert Coming31-Aug-07 13:32

Re: Get Max of a column from database

31-Aug-07 13:32

Is this a misspelling or did you do this in the table too?

.NET_Labview wrote:
sb.Append("SELECT MAX(updated_timestamp) lastUpadateTime FROM TABLEA");

'lastUpadateTime'

I think it may be spelled as 'lastUpdateTime' in the database.

The best way to accelerate a Macintosh is at 9.8m/sec² - Marcus Dolengo

.NET_Labview1-Sep-07 13:53

.NET_Labview

1-Sep-07 13:53

Thanks expertcoming!!

this is just an Alias used to represent the result set..though I agree this is a spelling mistake.....

now based on what I have found I need to know if we can have a dataset having a single value as resultset.

Can you tell me if we can have one value as a dataset......

SQL cookbook

DQNOK31-Aug-07 9:51

31-Aug-07 9:51

Does anybody know of a good on-line SQL "cookbook"?

I see that O'Reilly actually publishes a book by this name, but it is a book (perhaps not as googleable as online source). I see the same questions keep popping-up here repeatedly, and it's difficult to locate the "search forums" dialog here at codeproject (it took me a good while to locate it). Perhaps folks could get quicker answers to their specific questions if a searchable cookbook was readily available.

Actually, even having the Search function here at codeproject apply to the forums (instead of just Articles and Authors) would reduce some of the noise. But even then, a well written, easily searchable cookbook would sure be nice.

David

Re: SQL cookbook

Vasudevan Deepak Kumar1-Sep-07 1:22

Vasudevan Deepak Kumar

1-Sep-07 1:22

How about BooksOnline?

http://msdn2.microsoft.com/en-us/library/ms130214.aspx[^]

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

Re: SQL cookbook

DQNOK10-Sep-07 6:15

insertin data into new table

10-Sep-07 6:15

Thanks for the reply.

Actually, I had in mind more of a "cookbook"; simple pre-packaged answers to common issues and questions like the ones that crop-up repeatedly within this forum. Good link anyway. Think I'll download it!

David

rcwoods31-Aug-07 8:28

31-Aug-07 8:28

hi.
could someone please help me out.
im tryin to take data from one table, summarize it, and insert it into a new table.

what i have is a current 'daily' stats table for a user. but now what i want to do is take that data and add up 7 days worth of stats for each user. so, in other words, i have the last weeks stats for each user.

basically i need to know how to select data out daily table and then insert into weekly table.

Thanks!

Colin Angus Mackay31-Aug-07 8:36

Colin Angus Mackay

31-Aug-07 8:36

The INSERT command can contain a SELECT

INSERT INTO Destination
SELECT Column1, Column2, Column3
FROM SourceTable

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DQNOK31-Aug-07 10:07

31-Aug-07 10:07

Depending on what you mean by "summarize it", I suspect you may be looking for a "GROUP BY" construct.

INSERT INTO tblWeekly
SELECT userName, SUM(stats)
FROM tblDaily
GROUP BY userName;

Can you give a few-record example of 'daily stats' and then what a summary of those stats should look like in the weekly table?

David

rcwoods2-Sep-07 0:01

2-Sep-07 0:01

thanks for the reply.

i have a table "DailyUsage", which has 3 fields, namely Username, TheDate, DailyCount. primary key is a combination of Username and TheDate.

Now, because this table is pretty big, cos its storing daily usage for the last year, I want to do a sort of round robin methodoligy so my reports can run alot quicker.

So, ive created a table called "weeklyUsage" which will have Username, TheDate, and WeeklyCount. tbl WeeklyUsage will have only for example the last 3 or 4 weeks of data in it. So, I need to do a SUM of DailyCounts for each username for the last 3 or 4 weeks and then insert into tbl WeeklyUsage...

DQNOK10-Sep-07 4:01

10-Sep-07 4:01

Sorry about taking so long to respond; I have been out of town.

How about

INSERT INTO weeklyUsage
SELECT Username, SUM(DailyCount)
FROM DailyUsage
GROUP BY Username
WHERE TheDate > DATE() - 21;

to get summaries for the last three weeks.

David

rcwoods10-Sep-07 11:04

10-Sep-07 11:04

thanks for the reply.

i tried that DATE() function but its not working, im using SQL Server.dont know if thats the problem.
Is that 'DATE()' suppose to give me the current date?

DQNOK10-Sep-07 11:08

10-Sep-07 11:08

Yes, the current date. In Oracle, it's "SYSDATE()" plus some other synonyms. I don't use SQL Server, and don't know what it wants.

Since you didn't give examples, I am not sure the query I provided will give what you want, but from your description, i *THINK* it's what you want. Let me know how it turns out.

David

rcwoods15-Sep-07 3:51