Is there a way to limit the number of rows returned by a SqlDataReader? I know I can do it by modifying the Stored Procedure, but I'd rather not modify a procedure that is used in multiple apps. I'm hoping there is something easy like setting SqlDataReader.RowsReturned = 100, but that might be too easy to hope for.
View 10 RepliesIn C#, when I'm using an SqlDataReader to run a simple select query and use the values returned I have a question about referencing the field values.
There seem to be a large number of "Get" type methods (i.e reader.GetValue(int i), etc.) All of them (that I have found so far, require the use of the index of the field (GetValue(0) is the first field and so on).
Is there a way to use the actual name of the field? (i.e. GetValue("myField"))? This helps code readability but the big reason is that changes to the underlying field list can completely hose up the application.
I know there are such functions in VB, but I just can't seem to find the equivelants in C#.
I am doing some SELECT queries on my database through ASP, but for example, I only want to return the 50 most recent entries that match the criteria. Is there any easy way to limit the number of results returned?
View 1 Replies View RelatedHello,
I have a select statement that looks like this:
SELECT TOP 10 [Id], [Abstract] FROM NewsArticles
Abstract is a TEXT Column. I'd like to limit it to 50 characters... how would I do that.
Thanks,
-- shawn
In my ASP page, when I select an option from the drop down list, it has to get the records from the database stored procedure. There are around 60,000 records to be fetched. It throws an exception when I select this option. I think the application times out due to the large number of records. Could some tell me how to limit the number of rows to be returned to avoid this problem. Thanks.
Query
SELECT @SQLTier1Select = 'SELECT * FROM dbo.UDV_Tier1Accounts WHERE CUSTOMER IN (SELECT CUSTOMERNUMBER FROM dbo.UDF_GetUsersCustomers(' + CAST(@UserID AS VARCHAR(4)) + '))' + @Criteria + ' AND (number IN (SELECT DISTINCT ph1.number FROM Collect2000.dbo.payhistory ph1 LEFT JOIN Collect2000.dbo.payhistory ph2 ON ph1.UID = ph2.ReverseOfUID WHERE (((ph1.batchtype = ''PU'') OR (ph1.batchtype = ''PC'')) AND ph2.ReverseOfUID IS NULL)) OR code IN (SELECT DISTINCT StatusID FROM tbl_APR_Statuses WHERE SearchCategoryPaidPaymentsT1 = 1))'
When I use for instance:
SELECT
FORMAT(BegDate,"dd.mm.yyyy")
FROM TABLE1
result is - |BegDate|22.12.2013.......................|
Is there any way to limit length of string returned from FORMAT function .
Database is on ACCESS.
I have no problem getting OLE DB Command transformations to support single returns by a procedure.
For example, exec name_of_procedure ?,?,? OUTPUT
However, I have a stored procedure which accepts 1 input and returns 5 outputs. This procedure works fine at the command line but when I try to incorporate it into a OLE DB Command I don't get the multiple values returned. There's no problem at all configuring the transform as it recognizes all input and output parameters. For some reason I just don't get values returned.
thanks
John
I have a conditional split in an SSIS package - one split is where if rows are returned according to a specific rule, then insert those rows into to a Recordset Destinationm which points to a variable of Object type.
How I can use this variable to email fellow users. For example, what I would like is if ANY rows are returned to the Object variable (1 or more), then I would like to execute an email SP that we have on our server.
Hi,
Any idea why when I run a SELECT stament in Query anaylser it returns 45 rows. But when I create the exact same SQL as a view in Enterprise manager it only returns 44 rows?
Thanks,
Alph
I am using SQLExecute() in C++ code.
My query is "select * from Revoked_users"?
How I will come to know the no. of rows returned by SQLExecute() ?
The code below returns 0 rows. The statement is intended as generic statement that would return all records between a particular start and end date and on each date only between a specific start and end time. It works perfectly if the end date is greater than the start date.
Unfortunately, if the start and end dates are equal (i.e, return all records on that one date and only between the specified start and end times) then no records are returned.
BTW, it is also looking for matching datetimes in two tables and there really is matching data in the two tables for that particular date and times.
Can anybody help resolve this?
SELECT DISTINCT t1.* FROM [DbName].[SchemaName].[TableName1] AS t1,
[DbName].[SchemaName].[TableName2] AS t2
WHERE t1.[DateTime] BETWEEN CAST('2006-11-22' AS DATETIME) AND CAST('2006-11-22' AS DATETIME)
AND t2.[DateTime] BETWEEN CAST('2006-11-22' AS DATETIME) AND CAST('2006-11-22' AS DATETIME) AND
CONVERT(DATETIME,CONVERT(varchar, t1.[DateTime],114)) BETWEEN
CONVERT(DATETIME, '10:20:00') AND CONVERT(DATETIME, '12:19:59') AND
CONVERT(DATETIME,CONVERT(varchar, t2.[DateTime],114)) BETWEEN
CONVERT(DATETIME, '10:20:00') AND CONVERT(DATETIME, '12:19:59') AND
t1.[DateTime] = t2.[DateTime]
ORDER BY t1.[DateTime];
I have a qry/dataset in a report. If the qry returns no data the report will
simply show a the headers/footers and no data in the detail section. However, I need to display all zeros if the detail section ie '0', if no data is returned. How can I do that?
I have SSRS 2005.
I have a query in MySQL which needs to be translated to an equivalent in MSSQL Server. The query uses a LIMIT clause with an offset.
select * from test LIMIT 10,5
(meaning from the 10th row containing 5 rows in the result set)
How can we port the same logic to SQL Server ? I know TOP can retrieve top n rows but how can we specify the offset ?
Any help is appreciated !
Hello and thank you taking a moment. I have created a simple login page where the user will pass credentials. I have a sqldatasource that will query a database to see if the user exists. What I would like to do is have the user click a button after entering their credentials. When the button is clicked I would like the SqlDatasource SelectCommand to fire and if there are rows returned then redirect the user to a new page.
I know I can do this with ADO and a datareader with the HasRows property. But what I would eventually like to do is cache the data and then bind the cached data to a control(like a dataview) on the page the user is redirected to. If anyone can tell me how to get the Select command to fire on a button click I would be eternally grateful. Any help will be greatly appreciated.
Thanks,
Jason
I want to select data from a table with 5.000.000 rows. It's very slowly. Do you now, how I can select only a XY number of rows? I can't use TOP in select query. User see only 20-30 rows on his page, but he can use page_up, page_down. Is possible to something as lazy load?
View 2 Replies View RelatedIs it possible to get the number of Rows returned by a stored procedure in a profiler ?
if yes, what parameters shud I be looking for?
THanks
Harshal
I have a large table with approx 250000 rows in sql 2000. I need toreturn this from an asp page but the query to return this amount ofdata causes the asp to time out before the query completes.Is there any way in ado (or another way useable from asp / vb) that Ican run the query and then fetch a number of rows at a time? I can thene.g. pass the first batch of rows back to the client and then call forthe second batch.Any thoughts appreciated.
View 1 Replies View RelatedHi,I have a select statment that correctly returns zero rows at times. Iwould like to be able to return the value 0 (a single row with thevalue 0) whenever the logic returns zero rows.something like thisIf no.of.rows.returned = 0 thenoutput 0elseoutput query resultsend ifCan anyone poing me in the right direction to do this?many thanks,yohan
View 6 Replies View RelatedI running a query that returns a information from many tables. I need a way to compare the row returned to the previous row. This query currently returns the requested information for everytime an item placed. I need the query to return only the most recent order information. I can do this by doing a basic loop comparing the jobmatl.item and po.order_date. If the jobmatl.item match between the current row and last row compare the dates and keep the oldest.
Declare
@assembly ItemType
SET @assembly = '1110-2014'
SET @assembly = ISNULL(@assembly, '%')
SELECT
DISTINCT
jobmatl.item
, item.description
, item.drawing_nbr
, jobmatl.matl_qty
, itemloc.qty_on_hand
, vendaddr.name
, po.order_date
FROM
jobmatl with (nolock)
inner join item with (nolock) on item.item = jobmatl.item
inner join job with (nolock) on jobmatl.job = job.job
inner join poitem with (nolock) on item.item = poitem.item
inner join po with (nolock) on poitem.po_num = po.po_num
inner join vendaddr with (nolock) on vendaddr.vend_num = po.vend_num
inner join itemloc with (nolock) on itemloc.item = item.item
WHERE
jobmatl.job < ' 990000'
AND
job.item LIKE @assembly
ORDER BY
jobmatl.item
, po.order_date
I have a report that calls a stored procedure. I want to display the number of records that the stored procedure returned. I can't seem to find an expression that will do this. Is there an expression that will display the record count for a dataset?
Thanks,
Rob
There may/may not be an upper limit for the number of rows in a table, but is there any performance-related limit?
I'm designing a database that stores results that have been acquired from a number of devices. Each device provides a set of data measurements every 10 minutes. Therefore each year a device will produce 52000 sets of results.
If I design a table to store a row for each set of measurements from a device (PK is based on the timestamp and the deviceID), and if there are 100 devices recording for 5 years, there will be 52000x100x5 rows. Would I get a performance increase by separating this data into one table per year? Perhaps the year could be appended to the table name to identify the particular tables.
A secondary issue is some devices can also be configured to produce a different set of measurements every 10 seconds. In this case there will be hundreds of millions of rows over a 5 year period. Therefore I am considering bulking the results into an array for a 10 minute period, and storing this array as a blob each 10 minutes. Is this going to be faster or slower than having hundreds of millions of rows?
Thanks in advance for any advice,
Mark.
Hi,
Here's my problem.
I have an Area Chart, and I need to plot more than 300,000 records. Problem is RS cannot seem to handle this huge dataset. It would retrieve for 20mins, then after that it will just have an error "Internet Explorer cannot display the webpage". I am not encountering this if I just have a few records to plot. Please help
Hallo!I have small or big problem.I want creat Store Procedurs whit limit rows.For example I need rows from 100 to 200.--Select * from tableHow I doing best way.
View 1 Replies View RelatedIs there a limit of how many rows a table can have in SQL compact Edition? I didn't find anything in the documentation, but I get regularly a funny error message "Expression evaluation caused an overflow. [ Name of function (if known) = ]" when I try to create record number 32768 (is equal to 2 to the power of 15).
Where is this limit documented ?
Code Snippet
const string connectionString = "Data Source='" + dbFileName + "'; Max Database Size = 4091; temp file max size = 4091";
using (SqlCeEngine testEngine = new SqlCeEngine(connectionString)) {
testEngine.CreateDatabase();
}
using (SqlCeCommand addMValuesTableComand = testDbConnection.CreateCommand()) {
addMValuesTableComand.CommandText = "CREATE TABLE MValues (MSerieId int, TimeStamp smallint, Value real, PRIMARY KEY(MSerieId, TimeStamp))";
addMValuesTableComand.ExecuteNonQuery();
}
//fill table
StatusLabel.Text = "fill MValues Table";
using (SqlCeCommand fillTableComand = testDbConnection.CreateCommand()) {
int i = 0;
try {
int iterationCount = (int)RecordsCountNumericUpDown.Value;
ProgressBar.Value = 0;
ProgressBar.Maximum = iterationCount;
for (i = 0;i < iterationCount;i++) {
fillTableComand.CommandText = "INSERT MValues VALUES (1, " + i.ToString() + ", " + (i/100.0).ToString() + ")";
fillTableComand.ExecuteNonQuery();
ProgressBar.Value = i+1;
}
} catch (Exception ex) {
ErrorTextBox.Text = "Error occured" + Environment.NewLine +
"Iterations: " + i.ToString() + Environment.NewLine +
"Error Message: " + ex.ToString();
}
}
The following query only brings back too much data in the table - there are duplicates and the lab it shows is wrong.
The problem is:
AND a.calLab = f.ID
in the Where statement.
Some equipment does not need calibration, so, a.calDueDate = 0 AND a.calLab would be NULL or 0.
tblLabs ID field has 1 - 18 (Labs) - no 0 and of course no null
I need to get the rest of the data.
Any suggestions?
Thanks.....
Zath
SELECT a.assignedID,
b.Manufacturer,
a.modelNumber,
a.serialNumber,
e.equipmentType,
a.Description,
c.Location,
d.Status,
a.modifiedDate,
a.modifiedBy,
a.Notes,
a.Picture,
f.LabName,
a.calibrationRequired,
a.calDate,
a.CalDueDate,
a.assetNumber,
a.ID
FROM tblEquipments a,
tblManufacturers b,
tblLocation c,
tblStatus d,
tblEquipment_Type e,
tblLabs f
WHERE a.manufacturer = b.manufacturerID
AND a.location = c.locationID
AND a.Status = d.statusID
AND a.EquipmentType = e.ID
AND (a.calLab = f.ID or a.calLab Is NULL or a.calLab = 0)
ORDER BY a.ID
hello,
i have a stored procedure SELECT CommentID, UserName, CommentingDate
FROM Comm
WHERE PictureID = @PictureID
ORDER BY CommentingDate DESC
witch shows me the users who commented a Picture with PictureID = x
I need to add two rows at that stored procedure, one to show the number of total comments at that picutre (like counting the number of rows returned) and the second to show count the DISTINCT users who commented that picture
I tryied with COUNT but i have to use GROUP BY and i don't think this is good...
I hope you understand... please help me,
thanks
I have my SQLDataSource configured as shown in the picture. I ran the Execute Query and input an ID I know is in the database and it returned nothing. I ran into this probelm on another part of my site and i got it working by using 2 SQLDataSources, but im trying to keep the amount of code down.
http://junk.icore-studios.com/junk/Codeissues/Innerjoins.JPG
Any ideas on why it would be behaving this way?
As a part of my unpaid internship, I am creating a ASP.NET interface for a MS SQL Server 2000. The table I am having problems with has over 750,000 rows by 26 columns. There isn't a primary key. It stores a transaction dump from another primitive Database server.
Problem:
When perform a query I get one set of results. I run the same query again after a short wait and the rows returned are in a different order. The majority of the rows returned are the same ones returned in the previous query. Only, some rows may be missing and the order may change.
I really wasn't surprised by some duplicate rows. I am confused why they are showing up in a different order and the above mentioned inconsistancy in results.
I thought I was having problems with my Repeater Control; however, SQL Query Analyzer returns the same results.
Question:
What is causing the problem?
Given the following results:
col0 col1 col2
THY 2,265,850 31
VIE 1,474,994 20
RID 1,221,800 17
ACC 1,124,335 15
FEI 445,184 6
DIR 433,783 6
ROM 324,365 4
What is the best way in a query to get the rank of the returned rows by either col1 or col2. In other words who's the number 1,2,3 etc...
total count col0 = 7
total col1 = 7,290,310
total col2 (would eqaul 100%)= 99%
Looking for a mathmatical solution to this any help would be appreciated.
Hi,
I have a problem that I would like help with.
I have to write an SQL Server 2000 stored procedure that returns rows from a table (a SELECT with an ORDER BY). A front end system calls the stored procedure and displays the returned rows. If there is more than one screen's worth of data (ie more than 20 rows returned from the table) then there is a requirement that the stored procedure only returns the rows for the screen ie, for screen 1 I need to return rows 1-20, for screen2 I need to return rows 21-40, screen 3 = rows 41-60.
The screen number will be passed into the stored procedure so I can work out what rows to return, the only problem is how can I tell SQL Server to only select the required rows (ie, say rows 21 to 40 from the returned rows). I can't see any arguments that allow selective rows to be returned (apart from TOP).
Any ideas??
Regards,
Chris
Hello, I have a question on sql stored procedures.
I have such a procedure, which returnes me rows with ID-s.
Then in my asp.net page I make from that Id-s a string like
SELECT * FROM [eai.Documents] WHERE CategoryId=11 OR CategoryId=16 OR CategoryId=18.
My question is: Can I do the same in my stored procedure? (without sending it to page)
Here is it:
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
ALTER PROCEDURE [dbo].[eai.GetSubCategoriesById]
(
@Id int
)
AS
declare @path varchar(100);
SELECT @path=Path FROM [eai.FileCategories] WHERE Id = @Id;
SELECT Id, ParentCategoryId, Name, NumActiveAds FROM [eai.FileCategories]
WHERE Path LIKE @Path + '%'
ORDER BY Path
fileCategories table: (for information)Here is the screenshot of the table (10 kb )http://eai.w2o.ru/screen1.gif
Thank you
Artashes
How is the best way to check for No rows returned from a Select statement in a Stored Proc? I have see this:
Code Snippet
Declare @res int
set @res = NULL
Select @res = dbKeyColumn
From aTable
If @res is null
then no rows returned.
Surely there is a better way??
Thanks.
I'm using a simple data flow to extract rows from a table (using a SQL query) and put them in a flat file. If the query returns no rows, I don't want a file to be created. Right now it creates a file with the headers (since I do want the headers if there is data).
Any one know how to do this?
Kevin