I've had a look at this thread - http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=104399&SiteID=1 - but it's a bit old so I thought I'd try to clarify a couple of things.
I have a data flow which inserts or updates a table in a SQL 2000 database.
The insert is done via an OLE DB destination and the update is done via an OLE DB Command.
As stated in the previous thread, when these commands run concurrently issues arise with blocking etc.
The only way I've managed to get around it is by setting the access mode of the insert to OpenRowset.
So 2 questions:
1) Does anyone know how this problem occurrs and what the best way to get around it is?
2) Are there issues around NOT using the fast load options - I've read stuff about the double-byte character set etc but I admit I don't quite understand it.
I was wondering if it was possible to run 2 queries at the same time,IE rather than runningexec query1 exec query2 and having to wait for query1 to finish before query2 started, just have them run at the same time (they're not conflicting).I want to do this in TSQL, not by opening another query window in vs2005.
I issue an insert statement to the db. While I am getting a return value of 1 (1 row was affected) the values never show up into the db when I open the DB in access. However, I can see the data when it does an SQL select inside the program. So for instance, I do an insert into ORDER values (1, 12, 5.99). (1 = item ID, 12 = quantity, 5.99 = price). I then do a select * from Order, and I get those values back. When I open the DB in access, in between doing the insert and the select, I dont see the values there either. It is like it is making a temporary copy of the DB in memory during the execution only. When I close the program and re-F5, the data is no longer there. Maybe we need some kind of commit transaction? What am I doing wrong? I am using VB.Net 2005/MS Access 2003. Here is the relevant code :
Private m_Connection As OleDbConnection
''' <summary>
''' Defines the path to the database.
''' </summary>
''' <remarks></remarks>
#If CONFIG = "Debug" Then
Public Const DB_PATH As String = "DBsDB_Test.mdb"
#ElseIf CONFIG = "Release" Then
Public Const DB_PATH As String = "DBsDB_Production.mdb"
#End If
Sub connect(ByVal p_path As String) Implements IPartyDBase.connect
Dim connect_string As String = "Provider=Microsoft.Jet.OLEDB.4.0;" _
& "Data Source=" & p_path
m_Connection = New OleDbConnection(connect_string)
Throw New Exception("Bad addStockToDB into Stock " & tempInt)
End If
End Sub
Sub anotherSub
p_dbase.connect(PartyDBaseAccess.DB_PATH)
p_dbase.someSub()
p_dbase.close()
End Sub
Edit : During execution, looking under bin/debug/DBs, there is a copy of the database that has all the transactions I did during execution... but the actual DB isnt being updated/copied over.
I've just finished configuring the SELECT command for the SqlDataSource in my ASP.NET 2.0 web app. It works fine and runs against a SQL Server 2005 database, using a stored procedure that I've written. So, then I went to configure the SqlDataSource for the UPDATE and INSERT commands, and I've written two SP's for those as well. In the designer the second form of the wizard asks for the Select statement. I've already given that for the SELECT statement in the third form, and I also select the INSERT tab to specify the SP I want to use for inserting data and the UPDATE tab to specify the SP I want to use for updating data. However, there appears to be no way that I can specify what the parameters are supposed to be for anything other than the SELECT command, through the designer. Is that correct, or have I missed something?
I have a puzzle in my mind here. I will thank anyone who can solve my puzzle.
I am not familiar with SQL and its theories behind, so please bear with me if I am asking a stupid newbie question.
My puzzle is generally a problem of generating sequence numbers. The following SQL is only a stripped down version - it fetches the max number, add 1 to it and updates the table with the new number.
DECLARE @max int
SELECT @max = MAX(next_number) + 1 from sequence_numbers
UPDATE sequence_numbers SET next_number = @max WHERE next_number = @max
Now if user1 gets 100 and user2 also gets 100 and they both try to update the table, what would happen? I fear that the result would be 101.
One of my coworker thinks that adding 'WHERE next_number = @max' can solve the conflict - user2 will fail. His reasoning is like this:
After user1 updates the table, next_number would be 101 and user2's update will fail because his WHERE criteria is still 100.
But I think user2 still sees the old data (100) and still succeeds and thus both users update the table with number 101.
Visual Studio 2005 i have insert and update statements. they don't produce any errors but no changes happen in my tables. are there any possible reason for this. i used sqlcommand and even stored procedures but still the same.
Hello, what i want is simple. This is a simple forum, it has several topics (that the users can create), when a user create a topic, its stored in forum_topics. The user can then view the topic and post a response that is store in forum_answer, the user can also add this to his favorite list, forum_favorites is simple, contains a TopicID that refers to the topic, a username of the user that has the topic on his favorite list and a auto increment id to be able to delete specified topic favorites. Now my question is: when a user posts a answer to Topic X, i want a predefined message to be sent to post_inbox for all the users that has Topic X in their favorite list. How can i get MS SQL 2005 to get all the users from Topic X and then loop thru them and insert a new post into post_inbox?
Wondering what's the preferred method for this. I've got a scenario that a user is updating some content on a page and I need to update my word catalogs for my search feature. I have some code currently to filter out words that are too small, make sure there are no duplicates and to count how many occurrences there are of each. What I'm wondering is, does it make more sense to do a loop in my code to run all the insert commands to place the new words in the database, should I try sticking them together in one string and parse them when they get up there or is there a better method someone can suggest?
I'm building a simple webform, except Visual Studio and my service provider have combined to drive me nutty.
First, I MUST use an ODBC connection to my remote SQL Server do to some unknown configuartion problem. I've been playing with Visual Studio for only a month, so normally when something goes wrong I can go look in the mirror and find the culprit. This is different. I've got a totally functional web form with a SQL Connection, but when I try to change it to an ODBC Connection, I get the following error.
An OdbcParameter with ParameterName '@CertHolder' is not contained by this OdbcParameterCollection
My coding is fine because I stole it straight from the walkthrough and it works. But the specifications that Visual Studio provide are quite suspect. Please note the failure to include some key "@" signs.
#Region " Web Form Designer Generated Code "
'This call is required by the Web Form Designer. <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.SqlConnection1 = New System.Data.SqlClient.SqlConnection Me.cmdUpdate = New System.Data.SqlClient.SqlCommand Me.cmdGetAll = New System.Data.SqlClient.SqlCommand Me.cmdSelect = New System.Data.SqlClient.SqlCommand Me.OdbcConnection1 = New System.Data.Odbc.OdbcConnection Me.OdbcGetAll = New System.Data.Odbc.OdbcCommand Me.OdbcSelect = New System.Data.Odbc.OdbcCommand Me.OdbcUpdate = New System.Data.Odbc.OdbcCommand ' 'SqlConnection1 ' Me.SqlConnection1.ConnectionString = "this works fine" ' 'cmdUpdate ' Me.cmdUpdate.CommandText = "UPDATE InsuranceData SET Name = @Name, Address = @Address, Address2 = @Address2, " & _ "City = @City, State = @State, Zip = @Zip, CertHolder = WHERE (CertHolder = @Cert" & _ "Holder)" Me.cmdUpdate.Connection = Me.SqlConnection1 Me.cmdUpdate.Parameters.Add(New System.Data.SqlClient.SqlParameter("@Name", System.Data.SqlDbType.NVarChar, 50, "Name")) Me.cmdUpdate.Parameters.Add(New System.Data.SqlClient.SqlParameter("@Address", System.Data.SqlDbType.NVarChar, 50, "Address")) Me.cmdUpdate.Parameters.Add(New System.Data.SqlClient.SqlParameter("@Address2", System.Data.SqlDbType.NVarChar, 50, "Address2")) Me.cmdUpdate.Parameters.Add(New System.Data.SqlClient.SqlParameter("@City", System.Data.SqlDbType.NVarChar, 50, "City")) Me.cmdUpdate.Parameters.Add(New System.Data.SqlClient.SqlParameter("@State", System.Data.SqlDbType.NVarChar, 50, "State")) Me.cmdUpdate.Parameters.Add(New System.Data.SqlClient.SqlParameter("@Zip", System.Data.SqlDbType.NVarChar, 50, "Zip")) Me.cmdUpdate.Parameters.Add(New System.Data.SqlClient.SqlParameter("@CertHolder", System.Data.SqlDbType.NVarChar, 50, System.Data.ParameterDirection.Input, False, CType(0, Byte), CType(0, Byte), "CertHolder", System.Data.DataRowVersion.Original, Nothing)) ' 'cmdGetAll ' Me.cmdGetAll.CommandText = "SELECT CertHolder, Name, Address, Address2, City, State, Zip FROM InsuranceData" Me.cmdGetAll.Connection = Me.SqlConnection1 ' 'cmdSelect ' Me.cmdSelect.CommandText = "SELECT CertHolder, Name, Address, Address2, City, State, Zip FROM InsuranceData W" & _ "HERE (CertHolder = @CertHolder)" Me.cmdSelect.Connection = Me.SqlConnection1 Me.cmdSelect.Parameters.Add(New System.Data.SqlClient.SqlParameter("@CertHolder", System.Data.SqlDbType.NVarChar, 50, "CertHolder")) ' 'OdbcConnection1 ' Me.OdbcConnection1.ConnectionString = "This works fine" ' 'OdbcGetAll ' Me.OdbcGetAll.CommandText = "SELECT CertHolder, Name, Address, Address2, City, State, Zip FROM InsuranceData" Me.OdbcGetAll.Connection = Me.OdbcConnection1 ' 'OdbcSelect ' Me.OdbcSelect.CommandText = "SELECT CertHolder, Name, Address, Address2, City, State, Zip FROM InsuranceData W" & _ "HERE CertHolder = @CertHolder" Me.OdbcSelect.Connection = Me.OdbcConnection1 Me.OdbcSelect.Parameters.Add(New System.Data.Odbc.OdbcParameter("CertHolder", System.Data.Odbc.OdbcType.NVarChar, 50, "CertHolder")) ' 'OdbcUpdate ' Me.OdbcUpdate.CommandText = "UPDATE InsuranceData SET Name = @Name, Address = @Address, Address2 = @Address2, " & _ "City = @City, State = @State, Zip = @Zip WHERE CertHolder = @CertHolder" Me.OdbcUpdate.Connection = Me.OdbcConnection1 Me.OdbcUpdate.Parameters.Add(New System.Data.Odbc.OdbcParameter("Name", System.Data.Odbc.OdbcType.NVarChar, 50, "Name")) Me.OdbcUpdate.Parameters.Add(New System.Data.Odbc.OdbcParameter("Address", System.Data.Odbc.OdbcType.NVarChar, 50, "Address")) Me.OdbcUpdate.Parameters.Add(New System.Data.Odbc.OdbcParameter("Address2", System.Data.Odbc.OdbcType.NVarChar, 50, "Address2")) Me.OdbcUpdate.Parameters.Add(New System.Data.Odbc.OdbcParameter("City", System.Data.Odbc.OdbcType.NVarChar, 50, "City")) Me.OdbcUpdate.Parameters.Add(New System.Data.Odbc.OdbcParameter("State", System.Data.Odbc.OdbcType.NVarChar, 50, "State")) Me.OdbcUpdate.Parameters.Add(New System.Data.Odbc.OdbcParameter("Zip", System.Data.Odbc.OdbcType.NVarChar, 50, "Zip")) Me.OdbcUpdate.Parameters.Add(New System.Data.Odbc.OdbcParameter("Original_CertHolder", System.Data.Odbc.OdbcType.NVarChar, 50, System.Data.ParameterDirection.Input, False, CType(0, Byte), CType(0, Byte), "CertHolder", System.Data.DataRowVersion.Original, Nothing))
I NEVER EVER TYPED ORIGINAL_CERTHOLDER IN THE SQL PREPARATION
End Sub Protected WithEvents btnSave As System.Web.UI.WebControls.Button Protected WithEvents SqlConnection1 As System.Data.SqlClient.SqlConnection Protected WithEvents ddlCertHolder As System.Web.UI.WebControls.DropDownList Protected WithEvents txtName As System.Web.UI.WebControls.TextBox Protected WithEvents txtAddress As System.Web.UI.WebControls.TextBox Protected WithEvents ddlCH As System.Web.UI.WebControls.DropDownList Protected WithEvents cmdUpdate As System.Data.SqlClient.SqlCommand Protected WithEvents cmdGetAll As System.Data.SqlClient.SqlCommand Protected WithEvents cmdSelect As System.Data.SqlClient.SqlCommand Protected WithEvents txtAddress2 As System.Web.UI.WebControls.TextBox Protected WithEvents txtCity As System.Web.UI.WebControls.TextBox Protected WithEvents txtState As System.Web.UI.WebControls.TextBox Protected WithEvents txtZip As System.Web.UI.WebControls.TextBox Protected WithEvents OdbcConnection1 As System.Data.Odbc.OdbcConnection Protected WithEvents OdbcGetAll As System.Data.Odbc.OdbcCommand Protected WithEvents OdbcSelect As System.Data.Odbc.OdbcCommand Protected WithEvents OdbcUpdate As System.Data.Odbc.OdbcCommand
'NOTE: The following placeholder declaration is required by the Web Form Designer. 'Do not delete or move it. Private designerPlaceholderDeclaration As System.Object
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init 'CODEGEN: This method call is required by the Web Form Designer 'Do not modify it using the code editor. InitializeComponent() End Sub
#End Region
Comments? Suggestions, I am not positive about how to fix this.
If I have a table with 1 or more Nullable fields and I want to make sure that when an INSERT or UPDATE occurs and one or more of these fields are left to NULL either explicitly or implicitly is there I can set these to non-null values without interfering with the INSERT or UPDATE in as far as the other fields in the table?
EXAMPLE:
CREATE TABLE dbo.MYTABLE( ID NUMERIC(18,0) IDENTITY(1,1) NOT NULL, FirstName VARCHAR(50) NULL, LastName VARCHAR(50) NULL,
[Code] ....
If an INSERT looks like any of the following what can I do to change the NULL being assigned to DateAdded to a real date, preferable the value of GetDate() at the time of the insert? I've heard of INSTEAD of Triggers but I'm not trying tto over rise the entire INSERT or update just the on (maybe 2) fields that are being left as null or explicitly set to null. The same would apply for any UPDATE where DateModified is not specified or explicitly set to NULL. I would want to change it so that DateModified is not null on any UPDATE.
INSERT INTO dbo.MYTABLE( FirstName, LastName, DateAdded) VALUES('John','Smith',NULL)
INSERT INTO dbo.MYTABLE( FirstName, LastName) VALUES('John','Smith')
INSERT INTO dbo.MYTABLE( FirstName, LastName, DateAdded) SELECT FirstName, LastName, NULL FROM MYOTHERTABLE
I have a web form with a text field that needs to take in as much as the user decides to type and insert it into an nvarchar(max) field in the database behind. I've tried using the new .write() method in my update statement, but it cuts off the text after a while. Is there a way to insert/update in SQL 2005 this without resorting to Bulk Insert? It bloats the transaction log and turning the logging off requires a call to sp_dboptions (or a straight-up ALTER DATABASE), which I'd like to avoid if I can.
I'm working on inserting data into a table in a database. The table has two separate triggers, one for insert and one for update (I don't like it this way, but that's how it's been for years). When there is a normal insert, done via a program, it looks like the triggers work fine. When I run an insert manually via a script, the first insert trigger will run, but the update trigger will fail. I narrowed down the issue to a root cause.
This root issue is due to both triggers using the same temporary table name. When the second trigger runs, there's an error stating that a few columns don't exist. I went to my test server and test db and changed the update trigger so that the temporary table is different than the insert trigger temporary table, the triggers work fine. The weird thing is that if the temporary table already exists, when the second trigger tries to create the temporary table, I would expect it to fail and say that it already exists.I'm probably just going to update the trigger tonight and change the temporary table name.
Hello,I am writing a stored procedure that will take data from severaldifferent tables and will combine the data into a single table for ourdata warehouse. It is mostly pretty straightforward stuff, but there isone issue that I am not sure how to handle.The resulting table has a column that is an ugly concatenation fromseveral columns in the source. I didn't design this and I can't huntdown and kill the person who did, so that option is out. Here is asimplified version of what I'm trying to do:CREATE TABLE Source (grp_id INT NOT NULL,mbr_id DECIMAL(18, 0) NOT NULL,birth_date DATETIME NULL,gender_code CHAR(1) NOT NULL,ssn CHAR(9) NOT NULL )GOALTER TABLE SourceADD CONSTRAINT PK_SourcePRIMARY KEY CLUSTERED (grp_id, mbr_id)GOCREATE TABLE Destination (grp_id INT NOT NULL,mbr_id DECIMAL(18, 0) NOT NULL,birth_date DATETIME NULL,gender_code CHAR(1) NOT NULL,member_ssn CHAR(9) NOT NULL,subscriber_ssn CHAR(9) NOT NULL )GOALTER TABLE DestinationADD CONSTRAINT PK_DestinationPRIMARY KEY CLUSTERED (grp_id, mbr_id)GOThe member_ssn is the ssn for the row being imported. Each member alsohas a subscriber (think of it as a parent-child kind of relationship)where the first 9 characters of the mbr_id (as a zero-padded string)match and the last two are "00". For example, given the followingmbr_id values:1234567890012345678901123456789021111111110022222222200They would have the following subscribers:mbr_id subscriber mbr_id12345678900 1234567890012345678901 1234567890012345678902 1234567890011111111100 1111111110022222222200 22222222200So, for the subscriber_ssn I need to find the subscriber using theabove rule and fill in that ssn.I have a couple of ideas on how I might do this, but I'm wondering ifanyone has tackled a similar situation and how you solved it.The current system does an insert with an additional column for thesubscriber mbr_id then it updates the table using that column to joinback to the source. I could also join the source to itself in the firstplace to fill it in without the extra update, but I'm not sure if theextra complexity of the insert statement would offset any gains fromputting it all into one statement. I plan to test that on Monday.Thanks for any ideas that you might have.-Tom.
Can I roll back certain query(insert/update) execution in one page if query (insert/update) in other page execution fails in asp.net.( I am using sqlserver 2000 as back end) scenario In a webpage1, I have insert query into master table and Page2 I have insert query to store data in sub table. I need to rollback the insert command execution for sub table ,if insert command to master table in web page1 is failed. (Query in webpage2 executes first, then only the query in webpage1) Can I use System. Transaction to solve this? Thanks in advance
If these are all used up, and a 26th connection comes in. What happens? is the connection rejected? or does it sit in a queue, waiting to be given a connection?
hi i hv developed an application that runs on the local windows system and interfaces with the MSSQL 7.0 database server using ODBC DSN Connections. This application will be deployed over the LAN with over 100 users.
The MSSQL 7.0 server has only 5 user licenses that limits the concurrent usage to 5 users.
I need a solution whereby all users can access the SQL server database without adding more licenses
I have been searching hi and low on the web to try and find out typically which version of sql server should be used based on the number of concurrent users you will be having.
I believe that Sql Server 2005 Express should only really be used for up to 10 concurrent users while I seem to remember that Standard edition supports up to approx. 33,000 connections.
Does anybody have this information to hand as I need to write a business case to justify the potential upgrade.
Hi,Is it possible to have many different clients conncecting to a web basedserver all using, simultaneously, the same DSN-less connection string heldin a server side include file?Many thanksRay Allison
MSDE will only allow 5 concurrent connections to ...
a particular database? a particular instance? or a particular server?
ie. if i have one application running on one instance of MSDE with 5 connections and i have another application running on another instance of MSDE with 5 connections. would i actually have 10 connections? **both instances on the same machine...
I need to know how many concurrent users are allowed to access the database at any point of time.Will it depend on the type of licence?Where do we set this parameter.Some users are complaining 'time out' problem.Thanks for any help!
I have a stored proc that runs every 4 hours - as a job. The stored proc takes about 3-5 minutes to comple, depending on number of records. To do testing we run that stored proc manually, also. Sometimes 2 or more people may run the same stored proc without knowing that the other person is running. This may create duplicates entries once processed.
What I want to know is, Is there a way to check if that stored procedure is currently running. If so it wont run second time concurrently. (May be semapohres,mutex or something like that?)
(I am trying not to use a table to store whether the stored proc is running or not)
On my server running SQL Server 2000 (SP3). I frequently get thisinformational message in the Event Viewer log.17052 :This SQL Server has been optimized for 8 concurrent queries. This limit hasbeen exceeded by 2 queries and performance may be adversely affected.The application that I am running is a vendor application so I do not haveaccess to the code. I contacted the vendor, but they have never seen thisproblem and cannot recreate it. I checked the Microsoft Knowledge Base forhelp, but I came up empty. It seems like it should be a simpleconfiguration change.Any advice?Thanks,Jeff
I've been asked to turn our single-user database system into a multi-usersystem. At present, each user has a copy of the MSDE on their desktopmachine and uses our program to access it. In future, we would like tocentralise our MSDE instance and allow multiple users to access it. Inorder to facilitate this, we are going to only allow one user write accessto the system at a time (I know, its a kludge, but the system was neverdesigned for multiple users in the first place).I have a single, simple question this being the case: can I update a single"read-only" bit field in a table of the database in order to flag to otherusers that the system is in read-only mode in a way that avoids concurrencyissues? ie. does an "UPDATE" query lock and unlock? ( I suspect the answeris yes! ). If anyone else has experience of these things, I would alsoappreciate some tips on how best to proceed.ThanksRobin
