|
Any way to get the quantity of records on a SqlDataReader object ?
<br />
SqlDataReader reader = sqlcommand.ExecuteReader();<br />
String[,] array = new String[ qty_of_rows_in_Select_Statement ,4];
|
|
|
|
|
Not until you've gone through all the rows returned by the reader.
This is because you are working with data as it is coming from SQL server and it doesn't know how many results are returned until it has sent them all to you.
James
"And we are all men; apart from the females." - Colin Davies
|
|
|
|
|
You can always execute a SELECT COUNT statement before the main statement, that will return the number of rows.
i.e. if your usual where clause is something like
SELECT * FROM OrderDetails WHERE CustomerID=59
You can get the number of rows by executing
SELECT COUNT(OrderID) FROM OrderDetails WHERE CustomerID=59
If you execute that using ExecuteScalar, you'll get the number of rows that will be returned by that query.
Incidentally, if there's a chance that this number could change in-between executing the two queries, or you just want to be extra careful, you'll want to execute both queries as part of the same transaction, ensuring that the number of records doesn't change as a result of someone else inserting/deleting records from the table.
Alternatively, you could consider taking the data to a DataSet first, since that's held in-memory you only execute the query once, and I'm pretty sure there must be a way to obtain the number of rows. This will have the usual advantages/disadvantages of using a DataSet as opposed to a DataReader.
--
Paul
"I need the secure packaging of Jockeys. My boys need a house!"
- Kramer, in "The Chinese Woman" episode of Seinfeld
MS Messenger: paul@oobaloo.co.uk
Sonork: 100.22446
|
|
|
|
|
Thanks, i solve the issue doing the following:
System.Data.SqlClient.SqlDataAdapter myDA = new System.Data.SqlClient.SqlDataAdapter(sqlcommand);<br />
System.Data.DataSet myDS = new System.Data.DataSet();<br />
String[,] array = new String[myDA.Fill(myDS),4]<br />
reader = sqlcommand.ExecuteReader();
but, i think that "select count" is a better idea because doesn't create the adapter and dataset and consume less processor.
|
|
|
|
|
I am attempting to query every table in my database and put the results in a record set, format the results to a cell string in html and print it out. The problem is that it is displaying only the results from the first table it matches to. Am I mistaken in thinking that it combines all results into one RS? If not, how do I accomplish what I want to do? The premise is this: I have several user request forms that output to their respective tables in my SQL Sevrver 2k DB. All the forms have the columns listed in the SELECT stametment below. I want to query all these tables for anything matching STATUS='OPEN' and display the results in a user queue. I have eliminated the HTML from the user queue page just to show what function I am trying to accomplish. Any help is GREATLY appreciated! (I aplogize for the sloppyness of the CELLSTRING & "<>" has been replaced with "[]")
============================CODE===========================
Dim objRS
Dim strSQL
Set objRS = Server.CreateObject("ADODB.Recordset")
strSQL = "sp_MSforeachtable 'select submitDate, requestorLastName, requestorFirstName, urlToForm, nof, status from ?'"
objRS.Open strSQL, MyConn
if objRS.eof then
response.redirect "noQueue.asp"
else
do until objRS.eof
cellString = "[tr style='padding: 3'][td][font face='Arial' size='2' color='#CCCCCC'][center]" & objRS["submitDate"] & "[/center][td][font face='Arial' size='2' color='#FFFFFF'][center]" & objRS("requestorFirstName") & " " & objRS("requestorLastName") & "[/center][td][font face='Arial' size='2' color='#FFFFFF'][center]" & "[a href='" & objRS("urlToForm") & "'][font color='#66CCFF']" & objRS("nof") & "[/a]" & "[/center][/td][td][font face='Arial' size='2' color='#FFFFFF'][center]" & objRS("status") & "[/tr]"
response.write(cellString)
objRS.movenext
loop
end if
|
|
|
|
|
The procedure probably does not return one recordset. Your other option is to create a SQL statement using UNION and put the select in for each table name.
|
|
|
|
|
|
As notadood mentioned, the storedproc is most probably not returning a single resultset, but rather a compound Recordset object.
Take a look at Recordset.NextRecordset it may be what you're looking for.
Bruce Duncan, CP#9088, CPUA 0xA1EE, Sonork 100.10030
'ugly naked women are good, when i'm not around, in front of someone else' - Shog9
|
|
|
|
|
I'm trying to connect to an access database via a system DSN because that's the database connection method utilized by my web provider. However, when I use the data adapter's wizard to configure the object, I see no option to use a DSN as a datasource. I either have to specify a server name or in the case of my Access database, specify a file path.
Do I manually have to configure the dataadapter to use a dsn? How do I do that?
Thanx.
|
|
|
|
|
Hey, is there any way when you select a distinct field, to get the rest of the fields in the table? Something like this is what i'm "wanting it to do":
aka: SELECT * DISTINCT myfield FROM MyTable WHERE isFunky = True
so is there any work around? i mean anything that you can do in vb6/access 2000? I dont know much about sql, just the basics, so if i can do anything obvious let me know, cuz truth is i probably dont know how to do it or wouldnt think of it.
~Timothy T. Rymer
http://tim.xpertz.com
http://www.digipen.edu
http://www.ttrx.com
|
|
|
|
|
I can't understand your question,its not clear but I know the statement you write is correct and work.
Mazy
"If I go crazy then will you still
Call me Superman
If I’m alive and well, will you be
There holding my hand
I’ll keep you by my side with
My superhuman might
Kryptonite"Kryptonite-3 Doors Down
|
|
|
|
|
Ok, everyone always sees tutorials on how to use "SELECT DISTINCT field" and then they name their field on which they want each record to have a different value in that field. So when you use just that statement, all you get is:
CUSTOMER_NAME
-----------------
Jimmy
Steve
Guido
Barry
Cloud
Kefka
Jonny
-----------------
I'm wondering how i can setup my Sql statement so that i can get the rest of that information with it, in vb6/access 2000.
"SELECT * DISTINCT url FROM Emails WHERE checked = False ORDER BY foundwith"
Passing this into a data object doesnt work, i want to be able get this in a recordset:
CUSTOMER_NAME | ID | CHECKED | FOUNDWITH | URL
------------------------------------------------
Jimmy | 45 | False | 4 | "http://www.web.com"
Cloud | 46 | False | 1 | "http://www.howdy.com"
Kefka | 47 | False | 1 | "http://www.studmuffin.com"
------------------------------------------------
So as long as everyone has been "CHECKED" from that url, then i dont want to look at that "URL".
Hope that explains my problem. Read my example above, does that look like it should work to you? i get
RunTimeError 3075: Missing operator in query expression (* DISTINCT url)
any reason why? thanks in advance.
~Timothy T. Rymer
http://tim.xpertz.com
http://www.digipen.edu
http://www.ttrx.com
|
|
|
|
|
hi,
you could try the following
SELECT DISTINCT CUSTOMER_NAME ID CHECKED FOUNDWITH
FROM Emails WHERE checked = False ORDER BY foundwith
for all fields except url
or
SELECT DISTINCT URL
FROM Emails WHERE checked = False ORDER BY foundwith
for url field only
you are right about "Select * Distinct .." won't work
Daniel O
|
|
|
|
|
I vote for this answer. But i think you have to seperate field names with commas.
|
|
|
|
|
SELECT DISTINCT CustomerName, ID, Checked, FoundWith, URL
So you're saying that I will get every Record with a distinct URL with this statement? If so will the fact that it has checked(which may all be false at the beginning), or foundwith(which will more than likely have other urls to have the same FoundWith = # with them) so if i state all of those as having to be DISTINCT, does that mean it checks all before adding them? Because basically if there's a statement that says this:
SELECT DISTINCT URL, Checked FROM Emails WHERE Checked = False
Isnt that going to cause problems? because say they're all false, does that mean i'm to get only 1 urls back no matter what the difference in URLs?
And this statement,
DanielO wrote:
you could try the following
SELECT DISTINCT CUSTOMER_NAME ID CHECKED FOUNDWITH
FROM Emails WHERE checked = False ORDER BY foundwith
for all fields except url
I'm just trying to get one url that isnt checked, that's all. The only reason why i'm doing that is so that I dont have to open up another recordset and look for all Customers from that URL, then see if they've been checked or not, and if they've all been checked, then goto the next url.
This is all really just fickle, I just wanted to know if there was a way to get all the fields from a Record, where i had a DISTINCT Field that had to be different, then if i have that first distinct record, i could see if it had been checked, and if not then move onto the next one. *shrug*
Thanks guys.
~Timothy T. Rymer
http://tim.xpertz.com
http://www.digipen.edu
http://www.ttrx.com
|
|
|
|
|
Yes,* DISTINCT url is wrong.You can't use anything before DISTINCT expression.After DISTINCT you listed the column you want to be distincted and only they will be return.
So:
If you write:
SELECT DISTINCT * from Emails where checked=False
or
SELECT * from Emails where cheched=False
then only you will see same result .If you write:
SELECT DISTINCT url from Emails where checked=false
Then you will see only url column.
And this statement:
SELECT DISTINCT url,ID from Emails where CHECKED=false
Return url and ID column and their COMBINATION will be unique.
If you write:
SELECT * FROM Emails where Checked=false
you will get all columns that their Checked is false.You can't have DISTINCT expression here because if you have two rows with the same URL then which one should return?Maybe both of them have false record for CHECKED column.So as I understand the best statement for you is the last one.Why do you want DISTINCT here?
Hope that helps.If you need more help or information you are welcome. 
Mazy
"If I go crazy then will you still
Call me Superman
If I’m alive and well, will you be
There holding my hand
I’ll keep you by my side with
My superhuman might
Kryptonite"Kryptonite-3 Doors Down
|
|
|
|
|
If I am reading this thread correctly than you should be able to use the GROUP BY clause. It does the same thing as DISTINCT but uses a different format.
It would look something like:
SELECT CUSTOMER_NAME, ID, CHECKED, FOUNDWITH, URL
FROM Emails WHERE CHECKED= False
GROUP BY CUSTOMER_NAME, ID, CHECKED, FOUNDWITH, URL
ORDER BY FOUNDWITH
|
|
|
|
|
Typing create table test.ooo ( a int check(a>0)); at the mysql prompt, i get an error message about using check constraint.
What's wrong?
rechi
|
|
|
|
|
I have a COM object method which has the following signature:
HRESULT MyMethod(LONG val1, BSTR val2);
When I call this method with the following syntax:
EXEC @hr = sp_OAMethod "MyMethod", NULL, 10, 'slkdfj'
I get a type mismatch error. Anyone have had this problem before?
Michel
It is a lovely language, but it takes a very long time to say anything in it, because we do not say anything in it, unless it is worth taking a very long time to say, and to listen to.
- TreeBeard
|
|
|
|
|
Hello
I´m new to this board, and found already some good advice here, but for this problem i didn´t find an answer so far.
I already have an Excel-Doc that consists of several sheets. I need to write now in the 3rd sheet data, from the first row to row 40 in column 2 for example.
The problem is that the row doesn´t has a header, what would identify the column as a "table". But that´s no problem, because i can fetch a Recordset to a column for example.
But this allows me only to modify row 2 and all further rows, but not the first row where ODBC expects the table name.
But i also have to modify the first row, i MUST 
Does anyone know to access by ODBC & SQL a EXCEL sheet/data from c++ on and writing at desired column and row position data?
Thank you
|
|
|
|
|
hi,
perhaps you could use automation execel
look at www.microsoft.com - knowledge base
HOWTO: Create Automation Project Using MFC and a Type Library (Q178749)
HOWTO: Use MFC to Automate Excel and Create/Format a New Workbook (Q179706)
hope it helps
Daniel O
|
|
|
|
|
Thank you , the second HOWTA article looks very interesting and elegant. Meanwhile i managed to do it by dropping a Column, for example with
[Sheet1$A:A] as tablename, and creating a new Table with same syntax passing a new "table" name.
niklas
|
|
|
|
|
Is there a way to SELECT from all tables of a specific "Type" in SQL Server 2000? For instance, I have abotu 50 tables that are of "User" type that I want to query, and I am not sure of the most efficient way. If it helps, this is the information I am wanting from ALL tables because they all contain these columns:
SELECT submitDate, requestorLastName, requestorFirstName, urlToForm, nof, status FROM <tablename> WHERE status = 'OPEN'
Can someone tell me the best way? Thanks...Robby
|
|
|
|
|
You can start with this:
sp_MSforeachtable 'select * from ?'
and then customize the select with whatever you want.
|
|
|
|
|
This is a great command. I can't seem to get it to do what I want. I have the command, but it seems to be just "picking" a table out of the database and displaying the properties. I am attempting to display this information in an HTML table. Here's the code:
sqlstr="sp_MSforeachtable 'select submitDate, requestorLastName, requestorFirstName, urlToForm, nof, status from ?'"
Set results = MyConn.Execute(sqlstr)
submitDate=results("submitDate")
requestorLastName=results("requestorLastName")
and so forth for each column...
I have approx 50 tables, and my html output only displays entries for only one of the tables...what do I need to do to be able to query all and display all for whatever table matches the query? Thanks
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
