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How can i determine all the currently logged users of my SQL Server dabase using ADO.NET
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I think you can query master.dbo.sysprocesses to derive who is logged in at any given moment in Sql Server. With that, you could create a class kind of like this:
using System.Data;
using System.Data.SqlClient;
public class SqlServerUsers
{
private static SqlConnection GetConnection()
{
string sCon = "Server=(local);Database=master;Trusted_Connection=True;";
SqlConnection con = new SqlConnection(sCon);
con.Open();
return con;
}
public static DataSet GetLoggedInUsers()
{
string sql = "SELECT hostname, loginame, cmd, program_name "
+ " FROM master.dbo.sysprocesses "
+ " WHERE hostname != ''";
using (SqlConnection con = GetConnection())
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandText = sql;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
return ds;
}
}
}
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Hello all. I need to know if that's possible.
I have a database with many tables, but other person is updating it, so there are tables that have changes: new fields, new relationships...
I have the backup with the new version and I have to update my database, but I don't want to lose the tables information. Is it possible to do that automatically? There are many tables to do it manually.
Regards,
Diego F.
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Diego F. wrote: I have a database with many tables, but other person is updating it, so there are tables that have changes: new fields, new relationships...
I have the backup with the new version and I have to update my database, but I don't want to lose the tables information. Is it possible to do that automatically? There are many tables to do it manually.
Don't quite follow you. What are you updating? This other person should be working with you in synchronization so you both are on the same page.
PC
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The thing is that I'm working with a large database with about 300 tables. Other person is working updating that db, adding fields and relationships to some tables. The problem is that I only have a backup with the new version and not the scripts with the changes.
So I need a way to "upgrade" my database with the new version without losing data.
I think it must be something like creating a new database restoring the backup and moving the data from the old database, but I don't know how to move that data.
Regards,
Diego F.
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Sounds like you two should be in close communication of what is going on with the database. I am assuming you are using some flavor SQL. The person doing the changes to the tables by adding fields and relationships should provide you with a script containing ALTER commands reflecting the new changes to the database that have been made. At this point, you would run the script and your backup database would be structurally the same as the updated database. No data loss, no moving of data, or anything like that.
http://www.w3schools.com/sql/[^] has a nice reference of SQL commands if you are not familiar with them.
Hope this gives you some ideas,
Paul
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Hi experts..im new to sql and i wrote this stored procedure for number to character conversion..
intially i have taken one numeric parameter and i have converted into varchar to display in words..
But i want to do one more modifications to this code..if i entered 500 then it shuld be treated
as 500 dollors and should be multplied with 45 and the result should be = 500 * 45.
But im returning varchar value..how to multiply with '45'. im getting data type conversion error..
Here im sending my code upto ten thousand only.. and return statement..
pls solve the problem..and thanks in advance..
@p_Number numeric(18,2) --> Parameter...
begin
declare @Num varchar(20)
declare @Dec varchar(3)
declare @Return varchar(2000)
set @Return = convert (varchar(2000),@p_Number)
set @Dec = substring(convert(varchar(20),@p_Number),len(convert(varchar(20),@p_Number))-2,3)
set @Num = substring(convert(varchar(20),@p_Number),1,len(convert(varchar(20),@p_Number))-3)
declare @Hundred Char(8)
declare @HundredAnd Char(12)
declare @Thousand Char(9)
declare @Lakh Char(5)
declare @Lakhs Char(6)
declare @Crore Char(6)
declare @Crores Char(7)
set @Hundred = 'Hundred '
set @Thousand = 'Thousand '
set @Lakh = 'Lakh '
set @Lakhs = 'Lakhs '
set @Crore = 'Crore '
set @Crores = 'Crores '
set @HundredAnd = 'Hundred and '
if len(@Num) = 1 -- One
begin
set @Return = testuser.fn_GetTextValue_arif(@Num)
end
else
if len(@Num) = 2 -- Ten
begin
set @Return = testuser.fn_GetTextValue_arif(@Num)
end
else
if len(@Num) = 3 -- Hundred
begin
set @Return = testuser.fn_GetTextValue_arif(substring(@Num,1,1)) + @Hundred
if substring(@Num,2,2) <> '00'
set @Return = @Return + 'And '
set @Return = @Return + testuser.fn_GetTextValue_arif(substring(@Num,2,2))
if substring(@Num,2,2) = '00'
set @Return = testuser.fn_GetTextValue_arif(substring(@Num,1,1)) + @Hundred
end
else
if len(@Num) = 4 -- thousand
begin
set @Return = testuser.fn_GetTextValue_arif(substring(@Num,1,1)) + @Thousand
if substring(@Num,2,1) <> '0'
set @Return = @Return + testuser.fn_GetTextValue_arif(substring(@Num,2,1)) + @Hundred
if substring(@num,3,2) <> '00'
set @Return = @Return + 'And '
set @Return = @Return + testuser.fn_GetTextValue_arif(substring(@Num,3,2))
if substring(@num,2,1) = '0' and substring(@num,3,2) = '00'
set @Return = testuser.fn_GetTextValue_arif(substring(@Num,1,1)) + @Thousand
end
else
if len(@Num) = 5 -- Ten Thousand
begin
set @Return = testuser.fn_GetTextValue_arif(substring(@Num,1,2)) + @Thousand
if substring(@Num,3,1) <> '0'
set @Return = @Return + testuser.fn_GetTextValue_arif(substring(@Num,3,1)) + @Hundred
if substring(@num,4,2) <> '00'
set @Return = @Return + 'And '
set @Return = @Return + testuser.fn_GetTextValue_arif(substring(@Num,4,2))
if substring(@num,3,1) = '0' and substring(@num,4,2) = '00'
set @Return = testuser.fn_GetTextValue_arif(substring(@Num,1,2)) + @Thousand
end
if @Dec <> '.00'
set @Return = @Return + 'And ' + testuser.fn_GetTextValue_arif(substring(@Dec,2,2)) + 'Paise '
select '$' + @Return + 'Only' as 'MoneyInWords' ---> Retrun value...
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I'm running msde2000, what I need to do is subtract data from the tables into a c.s.v file, I don't really want to make code changes and install updates of my app everywhere, so what I want to do is just create a script file or some statement that I can run through osql,
Any ideas?
Sql not my area of experties.
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Hi All
I want to run a stored proc to query a dynamic field set by a parameter. When I run the query I Get no results and I know the data exists.. Can anyone see if I am doing something incredibly dumb 
'''My sproc
CREATE PROCEDURE SearchOrders @Field nvarchar(20), @SearchStr nvarchar(20)
SELECT *
FROM SorDetail
WHERE (@Field=@SearchStr)
thanks y' all
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here is the solution, i was not able to figure this one out my girlfriend was good enuff to get one of the propellor heads to figure it out at here work:
CREATE PROCEDURE SearchOrders @Field nvarchar(20), @SearchStr nvarchar(20) AS
declare @Query nvarchar(4000)
set @Query = 'SELECT * FROM SorDetail WHERE [' + @Field + ']=''' + @SearchStr + ''''
exec sp_executesql @Query
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thedom2 wrote: one of the propellor heads to figure it out
So we're all just "propellor heads" to you. I see....
Anyway, this "expert" failed to mention the need to defend against incorrect or malicious input into the stored procedure.
You may like to consider putting the following code at the start of your stored procedure:
IF NOT EXISTS(SELECT *
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME='SorDetail'
AND SCHEMA_NAME = 'dbo'
AND COLUMN_NAME = @Column)
BEGIN
-- Column does not exist.
RETURN 0;
END
ColinMackay.net
Scottish Developers are looking for speakers for user group sessions over the next few months. Do you want to know more?
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Anybody know how to dump a database to SQL? (Yup, all tables, procedures, etc...)
I only read CP for the articles.
Code-frog System Architects, Inc.
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Hi,
Take the enterprice manager and just select what all the objects you want to script and then COPY and take the query analiser or any editor and PASTE it..
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If you are using SQL Server, select the database from the tree in left pane of Entrprise manager. Right click, select "All Tasks"->"Generate SQL Script". The resulting dialog will allow you to select whatever you want to script, and will generate scripts for all the schema. To get data in the tables, you will need to use somthing else, like BCP, or roll your own.
Absolute faith corrupts as absolutely as absolute power
Eric Hoffer
All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke
-- modified at 17:41 Friday 3rd March, 2006
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Okay, this may be a really stupid question, but sitting here and thinking about it, followed by a large number of Google attempts has left me unenlightened. Here goes:
Let's say I have an ASP.Net web application that displays a report to users using a datagrid. The query for the report is fairly complex and involves several joins using either poorly- or non-indexed tables containing hundreds of thousands of rows each. Suffice it to say, the query is long-running, which is not the greatest thing to have in a web application, but that's not really the point of my question.
Now, let's say an impatient user signs in to the application and requests the slow report described above. The server-side application logic opens a connection, generates a command for the report, and executes it against the database server. The user drums his fingers on his desk for a while, whistles for a few minutes after that, and finally says "Something must be wrong!" and stabs the 'Submit' button to generate the report again (causing a new request against the web server, causing another command to be created and executed etc.).
A minute passes and the query has still not returned...
The user, now completely disgusted, closes his/her browser and goes to lunch.
Now the question:
What happens to the two commands - in fact two *connections* - that are presumably executing at the database server? They were both created under the main process of the ASP.Net worker account, and the process has not disappeared, however there is no longer anyone listening for the command to complete and return (either the browser is closed or the user has browsed away).
Do the queries complete and return (to nowhere)? (no idea)
Is the database server somehow signalled that the commands have been 'orphaned'? (doubt it)
Do the commands, now presumably with a broken communication pipe the the client that requested their execution, sit until timeout occurs?
Is the end nigh, and should I try to find a cool, dry place to watch Armageddon?
The reason I ask is that I've observed similar issues in cases where a user posts a request for data from a long-running command, then closes his/her browser thinking that opening a new browser will make things go faster, only to find out that the DB server is almost completely unresponsive. I have also observed it from the DB server side, where there are large numbers of processes, alive and taking up CPU time, but never seeming to complete.
Thanks for any input.
The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!' ('I found it!') but 'That's funny...’
-- modified at 17:10 Thursday 2nd March, 2006
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This is my grand theory (im quite sure on this as i have SQLprofiled it in test environment)
Once the browser is closed the connection to Sql is lost and then sql svr aborts the process...
Prove me wrong People =)
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That's intuitively what I would expect, but I'm not certain it's what always happens. I should clarify somewhat by pointing out that my observations have been made with Oracle 9i, not SQL Server.
The reason I'm not sure orphaned connections are always cleaned up neatly and efficiently is based on two main points:
1. I've watched from the DB side as connections were created from ASP.Net applications, during the execution of which the client browser was either closed or directed to a different (and unrelated) URL. The connections have not always dropped gracefully.
2. This is more of a gap in my knowledge than anything, but it seems as if there's a point in the execution of a SQL command from any application client where control is passed to the DB server to complete the work and return results across the pipe. In ASP.Net, where the (OS) process creating the connection is tied to the application, not the client browser, and is not terminated merely because the browser closes. In such cases, it appears as if the message pipe might be broken with regard to returning results to the end client, but the process under which the work is being performed is alive and well.
Thanks for your input. If possible, could you provide some information on how you structured your tests? I'll be doing some of my own, so I'd be curious to see what you did.
The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!' ('I found it!') but 'That's funny...’
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I have a form that has a ComboBox and 5 Text box controls. All controls contain text field databinding to a dataset, except for the combobox, which has its datamember and datasource properties set to the same dataset. With this being said, I have a Binding Manager Base object that I'm using its methods to update the dataset, and then the tables. When the user selects a value in the combo box it fills the textbox controls. The problem I'm having is the combobox is populated with the existing Primary_Key fields for the table. I'm attempting to add records to the table. So when using my binding manager base function addnew() and populating the text property of the cbo box, it doesn't send the input text with the insert command. I attempted to bind the text field of the cbo to the dataset and that failed as well. However, I can hide a label (which is bound to the primary_key) and assign the text value of the cbo to the label when the cbo looses focus, and that works. Any ideas on how to get the cbo text value to work without having to pass it to a label? Thanks for your help!
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I'm trying to build a dynamic stored procedure. The parameter "@Column" is used to determine which column it's going to update. The problem I'm having is when i try to use an Int data type. Here's the code.
set ANSI_NULLS ON<br />
set QUOTED_IDENTIFIER ON<br />
go<br />
ALTER PROCEDURE [dbo].[MON_UpdateAppMsgPubStats]<br />
@Status char(1),<br />
--@StatusDTTM datetime,<br />
@PubId int,<br />
@Instance char(3),<br />
@Env char(5),<br />
@Node varchar(15),<br />
@Chnl varchar(30),<br />
@Column varchar(30)<br />
AS<br />
BEGIN<br />
DECLARE @sqlString varchar(8000)<br />
--SET @StatusDTTM = convert(char(30),getdate(),1)<br />
SET NOCOUNT ON<br />
SET @sqlString = 'UPDATE MON_AppMsgPubStatistics SET '+@Column+'='+@Status+', '<br />
+@Column+'DTTM='+convert(char(20),getdate())+'WHERE PUBID='+@PubId+<br />
' AND Instance='+@Instance+' AND Environment='+@Env+<br />
' AND PUBNODE='+@Node+' AND CHNLNAME='+@Chnl<br />
<br />
EXECUTE(@sqlString)<br />
END
And the Error Message...
Msg 245, Level 16, State 1, Procedure MON_UpdateAppMsgPubStats, Line 20<br />
Syntax error converting the varchar value 'UPDATE MON_AppMsgPubStatistics SET MsgParsed=T, MsgParsedDTTM=Mar 2 2006 12:44PM WHERE PUBID=' to a column of data type int.
Any help would be appreciated. Thanks!
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@PubId is an int, you need to CAST it first.
You also need to put apostrophes in the @sqlString to delimit various values (like varchars and datetimes)
You should put square brackets in the @sqlString around @Column in case you have column names with spaces or with the same name as SQL reserved words (e.g. [date])
Finally, if you really must use Dynamic SQL then please validate the data coming into your stored procedure to reduce the risk of a SQL Injection Attack[^]. For example:
IF NOT EXISTS(SELECT *
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME='MON_AppMsgPubStatistics'
AND SCHEMA_NAME = 'dbo'
AND COLUMN_NAME = @Column)
BEGIN
-- Column does not exist.
RETURN 0;
END
ColinMackay.net
Scottish Developers are looking for speakers for user group sessions over the next few months. Do you want to know more?
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I'm a new user of VB.NET with .NET Framework 1.1. My tutorial textbook included an ADO.NET chapter, and it made the following statement: "Although the sample in this chapter uses a Microsoft Access database, you don't have to have Microsoft Access installed. Visual Studio and ADO.NET include the necessary support to understand the Access file format as well as other formats."
Based on this statement, I developed my application on a WinXP box and built it's database usage around a Microsoft Access file. But when I deploy to a Win2k box that does not have Microsoft Access, my application crashes at the first database hit. If I deploy to a system with Access, then all is fine, so I know that the app is finding the file in the place where I told the installer to put it, but it looks like a non-Access system doesn't know what to do with the file. My deployment does include MDAC 2.7.
So what am I missing here? I've been scouring this website and the MSDN site looking for help and example code, but nothing addresses my question.
Thanks,
Phil
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I believe there is a separate install for the "Jet Engine" pieces needed for Access.
WinXp has them as part of the OS install, but Win2K might not. In the earlier versions of ADO, these were included in the MDAC install, but not in later versions.
Absolute faith corrupts as absolutely as absolute power
Eric Hoffer
All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke
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I'm trying to execute a stored procedure (like i've done many times) in C# using ADO.Net. Everything works fine up until 2 of the parameter additions, then it all goes to hell. Here's the code.
<br />
SqlConnection conn = new SqlConnection(strSqlConn);<br />
SqlCommand cmd = new SqlCommand();<br />
int pub = Int32.Parse(_pubid);<br />
<br />
cmd.CommandType = CommandType.StoredProcedure;<br />
cmd.CommandText = "MON_UpdateAMPTransformDataAndQueue";<br />
<br />
cmd.Parameters.Add("@environment", SqlDbType.Char,8);<br />
cmd.Parameters["@environment"].Direction = ParameterDirection.Input;<br />
cmd.Parameters["@environment"].Value = _environment;<br />
<br />
cmd.Parameters.Add("@node", SqlDbType.VarChar,30);<br />
cmd.Parameters["@node"].Direction = ParameterDirection.Input;<br />
cmd.Parameters["@node"].Value = _node;<br />
<br />
cmd.Parameters.Add("@channel", SqlDbType.VarChar,30);<br />
cmd.Parameters["@channel"].Direction = ParameterDirection.Input;<br />
cmd.Parameters["@channel"].Value = _chnlname;<br />
<br />
cmd.Parameters.Add("@pubid", SqlDbType.Int);<br />
cmd.Parameters["@pubid"].Direction = ParameterDirection.Input;<br />
cmd.Parameters["@pubid"].Value = pub;<br />
<br />
cmd.Parameters.Add("@subchannel", SqlDbType.VarChar,50);<br />
cmd.Parameters["@subchannel"].Direction = ParameterDirection.Input;<br />
cmd.Parameters["@subchannel"].Value = _subchnl;<br />
<br />
cmd.Parameters.Add("@queue", SqlDbType.VarChar, 30);<br />
cmd.Parameters["@queue"].Direction = ParameterDirection.Input;<br />
cmd.Parameters["@queue"].Value = targetQueue;<br />
<br />
cmd.Parameters.Add("@transdata", SqlDbType.Text);<br />
cmd.Parameters["@transdata"].Direction = ParameterDirection.Input;<br />
cmd.Parameters["@transdata"].Value = transformed;<br />
<br />
cmd.Parameters.Add("@instance", SqlDbType.Char, 3);<br />
cmd.Parameters["@instance"].Direction = ParameterDirection.Input;<br />
cmd.Parameters["@instance"].Value = _instance;<br />
<br />
cmd.Connection = conn;<br />
conn.Open();<br />
cmd.ExecuteNonQuery(); <<<< Throws Exception::: Procedure 'MON_UpdateAMPTransformDataAndQueue' expects parameter '@queue', which was not supplied. >>><br />
conn.Close();<br />
<br />
I know what the problem is, I'm just not sure how to fix it. When the debugger gets to the point of setting the Value of the @queue parameter. The targetQueue variable holds a value, but it never sets the Parameters value to it. It just stays null.... Same thing happens with @transdata, the variable that i'm assigning it hold a value, but the ".Value =" statement isn't setting the value.
Anyone have an idea?
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sonicsqwirl wrote: The targetQueue variable holds a value, but it never sets the Parameters value to it. It just stays null....
Is targetQueue == null? If it is, then you'll need to set the parameter value to System.Data.SqlTypes.SqlString.Null[^].
cmd.Parameters["@queue"].Value = (targetQueue == null ? SqlString.Null : targetQueue);
Jon Sagara
Look at him. He runs like a Welshman. Doesn't he run like a Welshman? Doesn't he? I think he runs like a Welshman.
Sagara.org | Blog | My Articles
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I have a table where I store an enum value from C#. I would prefer to store the value as text so that my sprocs that use the value would be more readable and flexible, but am worried about data bloat and perf since there will be a few hundred thousand entries. Does SQL do some smart things storing the same few strings many times? Or should I suck it up and store the enum as a tinyint?
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