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Ok, well I came up with a solution for this (for anyone interested).
The DataContext is not aware of any other contexts (through thread local storage) in any way. So I basically decided to use thread local storage to store my DataContext for the current thread (HttpRequest).
Here's how it works. The DataContext classes generated for a dbml file is a partial class, so I added a class file to the same project which contains a static factory method, GetDataContext(). GetDataContext checks HttpContext.Current.Items to see if a DataContext object already exists. If not, it creates and new one, stores it in HttpContext.Current.Items and the returns the new instance. If the object already exists, it just returns the existing object to the caller.
<br />
public static DataContext GetDataContext()<br />
{<br />
if(HttpContext.Current == null)<br />
return new DataContext(connectionString);<br />
<br />
if(HttpContext.Current.Items.Contains("DataContext"))<br />
{<br />
return (DataContext) HttpContext.Current.Items["DataContext"];<br />
}<br />
<br />
return new DataContext(connectionString);<br />
}<br />
Now, I am able to use TransactionScope to wrap my business logic without having to use DataContext directly. Plus there are other benefits, my Save method no longer requires the additional database call to retrieve the record and copy the changes before calling SubmitChanges(). So compared with my previous post, my Save method now looks like this:
<br />
public static Step Save(Step step)<br />
{<br />
KRATDataContext context = KRATDataContext.GetDataContext();<br />
<br />
if ( step.StepID <= 0 )<br />
{<br />
context.Steps.InsertOnSubmit( step );<br />
}<br />
<br />
context.SubmitChanges();<br />
<br />
return step;<br />
}<br />
Which requires one less database call, always a plus  . This all solves my Transaction problem because it uses the same connection object (because we're using the same DataContext which owns the Connection object) and so there is no longer any distributed transactions (DTC) required.
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My database table has got 5 fields and through my C#.Net code I'm adding the 6th field (using dataset and .WriteXmlSchema() )...........but it works fine for the first time............aftr tht since the DataSet schema has already been updated with the 6th column, it throws an error "6th Field already exists in database table"............
so i just want to do something like this :
if (check whther Access Database Column is already present for the ABC Table)
{
do {nothing}
}
else
{
do {add the 6th column - for which i already have the code}
}
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Post your real code to see where is problem.
I Love T-SQL
"Don't torture yourself,let the life to do it for you."
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Hello Friends,
Please let me know if there's an easy to change the Report Title of Crystal Report at Runtime Coz I could see that once you create the Crystal Report there's no option to change the title else I have to start from the scratch creating a new Crystal Report and at that point of time adding the title what I want.
Please share if you know something about this.
Thanking you in anticipation.
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yes you can change it...assuming you mean some text thats displayed as a title. there isnt much you can do with the version of CR(2008) at runtime, at least as far as dynamic charts go, but assuming you know what section your title is in, you can loop through that sections report objects, looking for text objects, i cant remmeber if there are title objects, and then you can change the text of the objects yo ufind...something like
int i = 0;
CrystalReport rpt = new CrystalReport(the class should be the name of your rpt file - the extension)
foreach (TextObject to in rpt.Section1.ReportObjects)
{
to.Text = i;
i++;
}
this way you can see what the index of the box you want changed is.. i recomend reading anything by Brian Bischof(sp?) or picking up one or more of his books if you'll have to deal with CR alot, even ones written in an older version helped me alot. i think i have Crystal Reporting for .NET.
I gave up on CR a while ago so there may be an easier way, this was just the first method that came to mind. hope it helps.
Please remember to rate helpful or unhelpful answers, it lets us and people reading the forums know if our answers are any good.
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If you don't need to do it at run time, then you can change the title of the report by right mouse clicking on the file name (myreport.rpt), go to properties, then the Summary tab and change the name of the report. I thought this was a bit strange, but it works for me. Crystal Reports 10.
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I didn't meant to change the name of the report. I'm talking about the last section in the Crystal Report creation wizard which asks you to enter a title for the report and that title gets displayed every time you execute the report ( e.g Sales Summary Report - 2008 ). The top most title on the report page.
To be more clear, I'm talking about the : PAGE HEADER (SECTION 2) of the Crystal Report. And I don't see any option to change the title name.
Please comment.
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Hi,
After the report is created by the wizard:
- Select from menu Report / Report parameters
- Add a string parameter
- Right click on the title and select Expression
- you can see the static text in the expression, replace it with the parameter
- just before launching the report, deliver the value for the parameter
Hope this helps,
Mika
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I’m creating a SQL script for an installation package that I’m working on. I want to parameterize the database creation process. Wants to be able to set the database name in a variable, and have the SQL script use that variable to create the database and the necessary tables.
So far … this part works to create the database
USE [master]
DECLARE @DBName varchar(60)
DECLARE @DBDir varchar(100)
DECLARE @SQL varchar(MAX)
SET @DBName = N'Test'
SET @DBDir = N'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\'
SET @SQL = N'CREATE DATABASE ' + @DBName + ' ON PRIMARY
( NAME = "' + @DBName + '",
FILENAME = "'+@DBDir + @DBName + '.mdf" ,
SIZE = 4048KB , MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB )
LOG ON
( NAME = "' + @DBName + '-01_log",
FILENAME = "'+@DBDir + @DBName + '_log.ldf" ,
SIZE = 4096KB , MAXSIZE = 2048GB , FILEGROWTH = 10%)'
EXEC (@SQL)
EXEC dbo.sp_dbcmptlevel @dbname=@DBName, @new_cmptlevel=90
IF (1 = FULLTEXTSERVICEPROPERTY('IsFullTextInstalled'))
begin
EXEC (@DBName + '.[dbo].[sp_fulltext_database] @action = "enable"')
End
However, I can’t seem to switch to the database in script, and create the tables in it
I’ve tried -> EXEC ('USE ' + @DBName)
And also -> USE @DBName
Could you help me please ? Thank you for your time
Cecil L. Phillip
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When you execute Exec('User' + @DBName), it is actually working. Since the exec syntax opens a new connection, your not retaining the new database in the connection your script in on. Your going to have to use 3 point qualifying names, or make a @Sql like:
Set @sql = 'Use ' + @DBName
+ ' --Do Something'
Then you'll probably run into errors about objects that must be ran first in the batch (stored procedures, for example), which "GO" will not fix because that is not a real sql syntax.
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how would i use 3 point qualifying names and the @DBName with a create table statement or an insert ? Could you give an example ?
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Set @Sql = 'Create Table ' + @DbName + '.dbo.TestTable '
+ '( col1 int )'
Exec (@sql)
"3 point qualifying names" is Database.Schema.Table.
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gotcha ...
I already generated the scripts to create the tables, populate them, and create the other db objects and its a lil over 5000 lines of sql code.
I guess there is not way to maintain the current connection and change the current database huh ... hhmmm
Thank you tho.
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Another point of view in creating an installation that might be useful for you.
If you create an initial database (in your own server) including all the necessary tables, views, stored procs etc. you can then:
- detach the database
- copy the data files to another location
- attach the database
After this you have a copy of the initial situation. What you can do with this is, that you can copy the files to another server (where you are installing your database) and again attach it in that sql server. This way you actually don't have to actually create any database or table creation script, simply *put* the database where you want it to be and attach it.
What you must do is to take care of:
- login creation
- user creation
- backup arrangement
- other feature used that are not stored in your database
For further info, take a look at sp_detach_db and CREATE DATABASE ... FOR ATTACH
Mika
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What I find horrifying is that you allow the user to set the database name!
Never underestimate the power of human stupidity
RAH
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i thought that was dumb too, but thats the process that the boss wants to follow. take in mind that we only develop internal applications. The users installing the app are actually the admins in the server room
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hi everybody
we developed windows application(c# + Linq),we have to create setup file for our application.How can i Deploy our application database along with our setup file.Please help me.
Thanks&Regards,
vishnu.
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Using Visual studio you'll want to add a Setup and Deployment project to your solution.
Add new project -> other project types -> setup and deployment
Very Good Example Here !!
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How do i create a "VIEW" in SQL in MS-ACCESS Databases ?
Help!
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Ranojay wrote: How do i create a "VIEW" in SQL in MS-ACCESS Databases ?
Help! 
They are in the "Queries" tab when you open the database within MS Access.
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Sorry friends!!!!!!
The Microsoft Jet database engine does not support the use of CREATE VIEW, or any of the DDL statements, with non-Microsoft Jet database engine databases.
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On my Vista dev machine, I've now twice come in to work in the morning to find my MSSQL service not running. This last time, the only logged event is the following, at 03:02:11 AM today:
SQL Server is terminating in response to a 'stop' request from Service Control Manager. This is an informational message only. No user action is required.
No updates are logged for today. How can I determine the source of the stop request
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Most likely your techs are applying service patches and rebooting. Check your security log form the event log. See if you see them login at the time of the restart.
Also check if the service is automatic startup.
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