ADO.NET :: Reading A Segment Of Huge Varbinaty (max) Field By DataReader

Oct 19, 2010

I have a table with just a column and a row in a table that it save just a file with size 1.5 GB ! C# application and sql server are in different machines. I want to read that file by DataReader every 100 MB then save all 100 MB files to disk by "FileMode.Append" for file stream and collect them to one file.

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I have a 1.5 GB file into a table. I want to read It from server and create a file stream with it for save.

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What should I do for read a hage file from data base?

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Jul 8, 2010

I'm trying to read data from a text file into a DataReader object using the following code but I get an exception:

OleDBException was unhandled.

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Also, I would like to know if it is efficient to read data of a text file into a datatable instead of using StreamReader object and traversing through the recordset.

[Code]....

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I'm Using a DataReader to Read about 100,000 records, my code look like :

[Code]....

I have a per row computation in reading the rows on GetMyType2Info() method, and this method also another method that I return only one record by ExecuteReader(). the problem is that when the MyTypeList (List<T>) has about 21,000 Items of MyType (<T>) System.OutOfMemoryException is thrown. wanted to know how to resolve this and wanted to know more about the maximum size of List<T> capacity. in addition the execution of the main Query with 100,000 records take about 4 seconds in SQLServer a record has only types of nvarchar , float,datetime and int

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Optimizing A Table With A Huge Text-field?

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I have a project which generates snapshots of a database, converts it to XML and then stores the XML inside a separate database. Unfortunately, these snapshots are becoming huge files, and are now about 10 megabytes each. Fortunately, I only have to store them for about a month before they can be discarded again but still, a month of snapshots turn out to become real bad for it's performance...I think there is a way to improve performance a lot. No, not by storing the XML in a separate folder somewhere, because I don't have write access to any location on that server. The XML must stay within the database. But somehow, the field [Content] might be optimized somehow so things will speed up...I won't need any full-text search options on this field. I will never do any searching based on this field. So perhaps by disabling this field for search instructions or whatever?The table has no references to other tables, but the structure is fixed. I cannot rename things, or change the field types. So I wonder if optimizations is still possible.Well, is it?The structure, as generated by SQL Server:

CREATE TABLE [dbo].[Snapshots](
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Performance isn't just slow when selecting data from this table but also when selecting or inserting data in one of the other tables in this database! When I delete all records from this table, the whole system is fast. When I start adding snapshots, performance starts to decrease. After about 30 snapshots, performance becomes bad and the risk of connection timeouts increase.Maybe the problem isn't in the database itself, although it's still slow when used through the management tool. (Fast when Snapshots is empty.) I mainly use ASP.NET 3.5 and the Entity Framework to connect to this database and then read the multiple tables. Maybe some performance can be gained here, although that wouldn't explain why the database is also slow from the management tools and when used through other applications with a direct connection...

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DataSource Controls :: Retrieve Text Field Using Datareader

Feb 25, 2010

I have text field on a sql server table and I retrieve it on string variable using datareader : string result = reader["MyTextfied"] but I have this errors ( text or binary field cannot be troncated ) My text fied contains a large of text

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Mar 25, 2010

i have a datareader who read from data field from sql server, this field is datetime format now, when this field is null it returns 01/01/1900!! how can i manage it without if or some check, is there a property in datareader or sqlserver properties who i can return null value from datetime field?

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DataSource Controls :: Almost 2 Seconds To Read A Datareader Field

Apr 16, 2010

I use a SqlDataReader to get fron sqlServer a row af a table. This table have a text field where I store a Xml configuration. In one case this Xml grow up to 650Kb. When I get the field from the datareader it cost amost 2 seconds:

INFO 2010-04-16 09:46:40,559 [12] Cms.dataContenido - readed
INFO 2010-04-16 09:46:42,356 [12] Cms.dataContenido - XMLContent

This is my code:

[Code]....

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ADO.NET :: Getting DataReader Field Text To System.Collections.IEnumerator

Feb 22, 2011

cmd_again =
new
SqlCommand
();
cmd_again.CommandText =
"select * from QMS_Processes1 where QMSParentProcessId=" +
id + ";"
;
cmd_again.CommandType =
CommandType
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System.Collections.
IEnumerator
ienum = rdr_again.GetEnumerator();
while
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{}

now i want 3 fields in datareader how do i get that?? i tried to create instance of System.data.common.dataRecordInternal..but it didnt happen.

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Sep 3, 2010

first of all, sorry if my title isn confusing as i dont really sure the specify description regarding what i wan to do. Now what i trying to do is, I getting 5 random images from the database, this is the code for me to get random 5 records from database:

[Code]....

I dont really know how to use array but willing to try if it is needed.

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Reading Int From A Hidden Field In .aspx?

May 24, 2010

I'm struggling to read an int from the hidden field on aspx page.

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The value is definately on the form, I can see it in the debugger and print it with <%: %>

When I read the form values in the controller, instead of an int I recieve a following string: <%: Model.MyObjectId %>

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The data is submitted using the post event.

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Datareader Vs Dataset - Get The Number Of Rows From The Datareader?

Nov 15, 2010

I'm having a method that exports content from the database to excel files. The method taks as paramaters a DataReader param and a int param - the number of rows. For the number of rows i'm using a dataset, wich i fill using the same query as for the datareader. So I'm executing it twice... Is there a way I can avoid that? get the number of rows from the datareader?

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C# - Already An Open DataReader Associated With This Command - When I'm Not Using Datareader

Jul 28, 2010

I am getting an error that an open DataReader associated with this Command, when I'm not using datareader(though probably executereader() is the same thing) how would I close this if I don't have a datareader present?

using (SqlConnection conn = new SqlConnection(ConnectionString))
{
SqlCommand cmd = new SqlCommand("spSelectAllTypes",conn);
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[code]...

I just want to be able to databind a bunch of dropdownlist in one open connection. (before I had multiple open and closes for each control)

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Code:
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{
Label2.Text = (Request.ServerVariables["REMOTE_ADDR"]);
}
else
{
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MVC :: A Catch-all Parameter Can Only Appear As The Last Segment Of The Route URL?

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I have this dynamic url and part of it will going to have paging enabled ike, "http://localhost:96556/MVC_Application/proceedings/url_link/url_section/url_item/url_position/page/2"But I'm getting this error at my route below "A catch-all parameter can only appear as the last segment of the route URL.Parameter name: routeUrl"

routes.MapRoute( _
"UrlItemProceedings", _
"proceedings/{*catchPath}/page/{page}", _

[code]...

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[Code]....

Stacked-column chart has inconsistent column segment widths

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StringBuilder stringbuilder = new StringBuilder();
string delimiter = ";";
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[code]...

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