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I've read the documentation and it says the following:
"This type is safe for multithreaded read operations. You must synchronize any write operations."
Would this mean it is unsafe to read and write at the same time?
I basiacly have a process running in the background that can generate an error set. This error willwill then get dropped into a dataview by my back end web page code.
Will this cause problems in my app when an update to the error report on the front end is called at the same time as the process is recording a new one?
Cheers
Tris
-- modified at 8:36 Friday 23rd December, 2005
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Hi,
Following is my table
id name designation
---------------------------
1 Prakash Des1
2 Prakash Des2
3 Prakash Des3
4 Prakash Des4
5 Sathish Des5
6 Sathish Des6
I want the query which should display the data like following format
id name Des1 Des2 Des3 Des4
------------------------------------------
1 Prakash Des1 Des2 Des3 Des4
Thanks
Warm Regards
Prakash-B
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this is a display problem select doesn't return "rows", it returns records. but most of the time, we reprensent them horizontally, because of the ease of the view.
if you want to display such a thing, you'll have to make the "decomposition" in the displaying job.
[edit]
will that timorous anonymous guy who vote this to '1' ever show off one day...
i persist thinking what i wrote is what to do, and if anybody counter say this, he'll always stay in the dark side of Codeproject, where people act anonymously. 
[/edit]
TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]
-- modified at 8:07 Friday 23rd December, 2005
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Hi,
Can you guide me how to make a decomposition
Thanks
Warm Regards
Prakash-B
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well, i don't know how you display your data, but here are the hints.
when you get the set of records from SELECT, you then know the number of records returned.
then you can extend your grid depending on that.
but i cannot say more, as i don't know which language you're using, nor your database schema...
but i hope you see the job to do...
TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]
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how we use soundprograming in vb.net through the help of data base
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khurramzaidi wrote: how we use soundprograming in vb.net through the help of data base
I don't understand what you want to do? Please can you explain better.
My: Blog | Photos
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucius
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I have a SQL record that contaings <NULL> and now i want to test on it as follows: If Not objConnReader.GetString(4) = "" Then
and got the error : Data is Null. This method or property cannot be called on Null values.
Is this to much straigt thinking.
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Two options
(1) Test against System.DbNull.Value
(2) Use IsDbNull()[^] on the DataReader object.
My: Blog | Photos
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucius
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I thought i had the solution but no. i wrote first:
If Not DBNull(4) Then
'There is a date
Else
'There is no date
End If
But it dit work if there was a date present. The second one was also wrong:
If Not IsDBNull(objConnReader.GetString(4)) Then
'There is a date
Else
'There is no date
End If
This one dint work at all so now i need some help
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I said to use IsDbNull() on the DataReader
Use: myDataReader.IsDbNull(columnOrdinal)
My: Blog | Photos
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucius
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Founf the solution. Have to use the stament:
If IsDBNull(4) Then
This works perfect
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I'm getting a "Failed to open database using..." error when attempting to connect to SQL Server located on a remote machine, using a user account login. Do I need to use a different Account setting? I'm currently using ServiceAccount.LocalSystem.
Marc
VS2005 Tips & Tricks -- contributions welcome!
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just wondering... Does the user account you are using to login to remote DB has right to access to?
<< >>
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If i perform sql query in SQL Server 2000, how can i select a particular range of values returned by query result?
For example if i want top 20 results, i can use the "Select Top 10 ....".
But, suppose I want to select query results from 51 to 60, how can i do it?
Thanks in advance
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For your answer check out this blog entry[^] by Bo Nørgaard[^]
My: Blog | Photos
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucius
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I have this giant stored procedure executing many small queries. In between these queries, i want to be able to return a record or just some number to the record set so that i can update the value for a progress bar in my program. I have the asyncFetch part set when i do an open:
Set mRS = New ADODB.Recordset
mRS.CursorType = adOpenStatic
mRS.CursorLocation = adUseClient
mRS.LockType = adLockBatchOptimistic
mRS.Properties("Initial Fetch Size") = 1
mRS.Open sTmp, gdb, adOpenStatic, adLockBatchOptimistic, adCmdText + adAsyncExecute + adAsyncFetch
I also set up an event in VB to catch the record set's fetch:
Private Sub mRS_FetchProgress(ByVal Progress As Long, ByVal MaxProgress As Long, adStatus As ADODB.EventStatusEnum, ByVal pRecordset As ADODB.Recordset)
Debug.Print "Fetch: " & Progress & _
" Max: " & MaxProgress
End Sub
.. but it never gets there.
-- modified at 20:33 Wednesday 21st December, 2005
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Hi everybody,
I like to asked anyone who is very good at sql to help me display this data in a table format that duplicate headings, subheadings or other columns won't appear twice or more. Can anyone help me? I need to sort them and load them in a Datatable. Loop thorugh all records and display them in a label control created at run time. Thanks in advance.
I have posted this topic on other forums, some solutions given but they are using approach for .Net Framework 2.0, I am using .Net Framework 1.1. I am trying to avoid using a lot of select Distinct sql queries to database and looping the data to be able to remove duplicates. Do anyone knows another approach using less code and less sql access?
Sample Data:
Topics Table
TopicId TopicLevel Topic ParentId
1 1 First 0
2 1 AnotherFirst 0
3 2 Second 1
4 2 AnotherSecond 2
5 3 Third 3
Contents Table
ContentID Heading SubHeading SubSubHeading1 NumberText Names Content1 ParentId
1 How are you? Hello Someone 1 Ben some text 5
2 How are you? Hello Someone 1 John other text 5
3 How are you? Hello Anybody 2 Ben some text 5
4 How are you? Hello Anybody 2 Mike other text 5
5 How are you? Greet Anywhere 1 Ben some text 5
6 How are you? Greet Anywhere 1 Luke some text 5
7 I miss you. Really When null null some text 5
8 I miss you. Really When null null some text 5
Display Format:
How are you?
----------------------------------------------
Hello
-----------------------------------------------
1 Someone
----------------------------------------------
Ben some text
---------------------------------------------
John other text
---------------------------------------------
2 Anybody
---------------------------------------------
Ben some text
---------------------------------------------
Mike other text
--------------------------------------------
Greet
-------------------------------------------------
1 Anywhere
-----------------------------------
Ben some text
-------------------------------------
Luke some text
================================================
I miss you
--------------------------------------------------
Really
------------------------------------------------
When
-----------------------------------------------
some text
----------------------------------------
some text
------------------------------------------
denpsia
-- modified at 19:33 Wednesday 21st December, 2005
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Thanks for reply, toxcct. I know that but to do this would requires a lot sql Select Distinct queries to filter each column and loop arround results to get next distinct columns and display them at run time.
denpsia
-- modified at 19:09 Thursday 22nd December, 2005
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if you have a lot of distinct to put, it is because the sql query is not well written...
you have to set to correct restrictions in the where clause.
TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]
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Toxcct,
I know that, just asking if there are much simpler and shorter way to do this. Thanks for reply.
denpsia
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Hi i need a query that can manipulate i.e count records on hour basis from a table depending upon time_in field....
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You are going to have to be more specific.
You can do a count with something like this:
SELECT COUNT(*) FROM MyTable
My: Blog | Photos
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucius
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How do you write a query that horizontally merges records from different tables? For example, say I have Person, Phone, and Email tables where Phone and Email have foreign key relationships to the Person table, and store 0 to n email and phone records for each person record.
The result query should include the person's name, all email addresses and all phone numbers, and the email addresses and phone numbers should be listed "side by side". To illustrate in CSV format;
--------------------------------------------------------------
LName, FName, EmailAddress, PhoneNumber
Jones, Sue, sjones@nowhere.com, 123-555-0203
Jones, Sue, sj@somewhere.com, 098-555-2382
Jones, Sue, SueJones@AspenState.com, NULL
Smith, Joe, jsmith@nowhere.com, 123-555-0202
Smith, Joe, js@home.com, 098-555-2382
Smith, Joe, NULL, 230-555-3298
Smith, Joe, NULL, 234-555-0982
Washington, Peter, NULL, NULL
...
--------------------------------------------------------------
In this example Sue has more email records than phone records, so the third record in the result set is NULL for the PhoneNumber field. Similarly, Joe has more email records than phone records so rows 6 and 7 have NULL for the EmailAddress field. Finally Peter has no email or phone records so both PhoneNumber and EmailAddress are NULL.
Any ideas? Thanks
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