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  • Timer or Thread?

    - by Pradeep Singh
    I have a method(say method1) that writes to database(sqlserver)and another method(say method2) that tries to access the same database after some time and updates the data row that was created by method1. The problem arises when method1 fails to access db due to the LAN being disconnected (this is not an exception this is a scenario that will definitely arise in my software, getting into details will make the question too complex) if method1 fails to access db method2 cannot work. What I want to do is to make method1 store values to local db instead of server if the LAN is disconnected and as soon as it enters value in local db the application should start trying to access the server after ever 10-15 seconds. What should I use timer or create a new thread?

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  • What does SQL Server's BACKUPIO wait type mean?

    - by solublefish
    I'm using Sql Server 2008 ("R1"), with some maintenance plans that back up my databases to a network share. Some of my backup jobs show long waits of type "BACKUPIO". Of course it seems like this is an I/O subsystem limitation, but I'm skeptical. Perfmon stats for I/O on the production (source) server are well within normal trends for that server. The destination server shows a sustained 7MB/s write rate, which seems incredibly low, even for a slow disk. The network link is gigabit ethernet and nowhere near saturated. The few docs I've turned up about BACKUPIO indicate that it's not specifically a wait on I/O, surprisingly enough. This MSFT doc says it's abnormal unless you're using a tape drive, which I'm not. But it doesn't say (or I don't understand) exactly what resource is missing. http://www.docstoc.com/docs/24580659/Performance-Tuning-in-SQL-Server-2005 And this piece says it's not related to I/O performance at all. http://www.informit.com/articles/article.aspx?p=686168&seqNum=5 "Note that BACKUPIO and IO_AUDIT_MUTEX are not related to IO performance." Anyway, does anyone know what BACKUPIO actually means and/or what I can do to diagnose or eliminate it?

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  • Unique identifier for an email

    - by Skywalker
    I am writing a C# application which allows users to store emails in a MS SQL Server database. Many times, multiple users will be copied on an email from a customer. If they all try to add the same email to the database, I want to make sure that the email is only added once. MD5 springs to mind as a way to do this. I don't need to worry about malicious tampering, only to make sure that the same email will map to the same hash and that no two emails with different content will map to the same hash. My question really boils down to how one would combine multiple fields into one MD5 (or other) hash value. Some of these fields will have a single value per email (e.g. subject, body, sender email address) while others will have multiple values (varying numbers of attachments, recipients). I want to develop a way of uniquely identifying an email that will be platform and language independent (not based on serialization). Any advice?

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  • PHP with DB backed-end application to complete windows EXE possible or not?

    - by Devyn
    Hi, Let's say I have a php application backed-end with SQLite and I would like to convert whole application to exe file so the end user can just click it and run on windows. User should be able to save, update and add new data into database without any web server or browser things. Is it possible? I found out that we can use PHP-GTK for UI. exeoutput.com supports with database engines according to it's website. Anyone have tried it out? If I'm missing something, pls share with me. Thanks all in advance and happy new year!!!

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  • How do I call window.openDatabase from a webView hosted in an android application?

    - by Kevin
    I created a native Android app that basically hosts a webView control. That webView is then used to load a page that calls window.openDatabase from JavaScript. I can successfully confirm that the API exists by verifying window.openDatabase. Calling this method returns a null when called in a hosted webView control. Calling the same method in the Android Browser returns an instance of the database. Does anyone know the permessions in the manifest or settings on the webView control that need to be set to access the database? Is this even possible in a native app.

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  • Updating DataGridView from another Form using BackGroundWorker

    - by FezKazi
    Hi! I Have one Form (LoginForm) which has a Background Worker Monitoring a database for new entries. Then I have another Form (AdminForm) which I need to signal to update its datagrids whenever new data is available. I could poll the database in the AdminForm too, but considering that LoginForm is already doing some polling, which can be costly, I just want to signal AdminForm to update the DataGridViews with the new data. You may ask, why is LoginForm doing the polling when youre showing the stuff in the AdminForm? Well, LoginForm is actually processing the data and sending it over the Serial Port :$ heheh. I want it to be able to process the data without having an administrator logged in all the time.

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  • T-SQL IsNumeric() and Linq-to-SQL

    - by cdonner
    I need to find the highest value from the database that satisfies a certain formatting convention. Specifically, I would like to fund the highest value that looks like EU999999 ('9' being any digit) select max(col) will return something like 'EUZ...' for instance that I want to exclude. The following query does the trick, but I can't produce this via Linq-to-SQL. There seems to be no translation for the isnumeric() function in SQL Server. select max(col) from table where col like 'EU%' and 1=isnumeric(replace(col, 'EU', '')) Writing a database function, stored procedure, or anything else of that nature is far down the list of my preferred solutions, because this table is central to my app and I cannot easily replace the table object with something else. What's the next-best solution?

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  • vb.net program cannot connect to wampserver

    - by user225269
    I have a vb.net program that uses mysql as its database. And it works when the computer has wampservr installed. But the program gets an unhandled exception error when the computer where its running does not have a wampserver. The only thing that is installed in it is the mysql connector net. How do I make it work. I just want the two programs to access the same mysql database. I already opened port 20 by configuring firewall. Both in TCP and UDP. What do I do? Do I have to tweak the codes?

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  • How do I insert into a unique key into a table?

    - by Ben McCormack
    I want to insert data into a table where I don't know the next unique key that I need. I'm not sure how to format my INSERT query so that the value of the Key field is 1 greater than the maximum value for the key in the table. I know this is a hack, but I'm just running a quick test against a database and need to make sure I always send over a Unique key. Here's the SQL I have so far: INSERT INTO [CMS2000].[dbo].[aDataTypesTest] ([KeyFld] ,[Int1]) VALUES ((SELECT Max([KeyFld]) FROM [dbo].[aDataTypesTest]) + 1 ,1) which errors out with: Msg 1046, Level 15, State 1, Line 5 Subqueries are not allowed in this context. Only scalar expressions are allowed. I'm not able to modify the underlying database table. What do I need to do to ensure a unique insert in my INSERT SQL code?

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  • What to consider if using triggers on tables in a sql-server merge replication

    - by Ice
    Hi, i am driving since some years a sql-server2000 merge-replication over three locations. Triggers do a lot of work in this database. i got no troubles. Now migrating these database to a brand new sql2008, i got some issues about the triggers. They are firing even if the merge-agent does his work. Is there anybody who has some experience with that kind of stuff on sql2008-server? Can anybody confirm that different behaviour to sql2000? Peace Ice

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  • How to use LIKE query in sqlite & iPhone

    - by 4thSpace
    I'm using the following for a LIKE query. Is this technique for LIKE correct? selectstmtSearch = nil; if(selectstmtSearch == nil){ const char *sql = "SELECT col1, col2 FROM table1 t1 JOIN table2 t2 ON t1.cityid = t2.cityid where t1.cityname like ?001 order by t1.cityname"; if(sqlite3_prepare_v2(databaseSearch, sql, -1, &selectstmtSearch, NULL) == SQLITE_OK) { sqlite3_bind_text(selectstmtSearch, 1, [[NSString stringWithFormat:@"%%%@%%", searchText] UTF8String], -1, SQLITE_TRANSIENT); } } The problem I'm having is after a few uses of this, I get an error 14 on sqlite3_open(), which is unable to open database. If I replace the LIKE with something such as: SELECT col1, col2 FROM table1 t1 JOIN table2 t2 ON t1.cityid = t2.cityid where t1.cityname = ? order by t1.cityname It works fine. I do open/close the DB before after the above code. Is there a way to troubleshoot exactly why the database can't be opened and what its relationship to my LIKE syntax is?

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  • Membership provider stopped working on using Membership Provider in ASP.Net MVC

    - by Michael Meadows
    I have a production ASP.Net MVC application that has been using the membership service. It has worked fine, up until today. Nothing has changed on the server, but I now have this error: System.Configuration.Provider.ProviderException: The 'System.Web.Security.SqlMembershipProvider' requires a database schema compatible with schema version '1'. However, the current database schema is not compatible with this version. You may need to either install a compatible schema with aspnet_regsql.exe (available in the framework installation directory), or upgrade the provider to a newer version. I checked the asp_schemaversions table, and it looks fine. Please any help would be appreciated.

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  • Let MySQL users create databases, but allow access to only their own databases

    - by eikes
    I want to have multiple a MySQL users to be able to issue commands like CREATE DATABASE dbTest; But I also want each of these users to be able to see and access only their own databases. All I could find was how to either create the databases by a DBA and grant the privileges on this database to the specific user: GRANT ALL PRIVILEGES ON dbTest.* TO 'user'; or grant privileges on all databases to a user: GRANT ALL PRIVILEGES ON *.* TO 'user'; But neither is what I want, because it needs to scale and be secure.

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  • I want to port my delicious bookmarks to my website

    - by puneet
    I started building a app that will automatically download my delicious bookmarks, and save to a database, so they I can view them on my own website in my favoured format. I am forced to use oAuth, as I have a yahoo id to login to delicious. The problem is I am stuck at the point where oAuth requires a user to manually go and authenticate. Is there a code/ guidelines available anywhere I can follow? All I want is a way to automatically save my bookmarks to my database. Any help is appreciated. I can work on java, .net and php. Thanks.

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  • Using a PreparedStatement to persist an array of Java Enums to an array of Postgres Enums

    - by McGin
    I have a Java Enum: public enum Equipment { Hood, Blinkers, ToungTie, CheekPieces, Visor, EyeShield, None;} and a corresponding Postgres enum: CREATE TYPE equipment AS ENUM ('Hood', 'Blinkers', 'ToungTie', 'CheekPieces', 'Visor', 'EyeShield', 'None'); Within my database I have a table which has a column containing an array of "equipment" items: CREATE TABLE "Entry" ( id bigint NOT NULL DEFAULT nextval('seq'::regclass), "date" character(10) NOT NULL, equipment equipment[] ); And finally when I am running my application I have an array of the "Equipment" enums which I want to persist to the database using a Prepared Statement, and for the life of me I can't figure out how to do it. StringBuffer sb = new StringBuffer("insert into \"Entry\" "); sb.append("( \"date\", \"equipment \" )"); sb.append(" values ( ?, ? )"); PreparedStatement ps = db.prepareStatement(sb.toString()); ps.setString("2010-10-10"); ps.set???????????

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  • Oracle JDBC connection exception in Solaris but not Windows?

    - by lupefiasco
    I have some Java code that connects to an Oracle database using DriverManager.getConnection(). It works just fine on my Windows XP machine. However, when running the same code on a Solaris machine, I get the following exception. Both machines can reach the database machine on the network. I have included the Oracle trace logs. Mar 23, 2010 12:12:33 PM org.apache.commons.configuration.ConfigurationUtils locate FINE: ConfigurationUtils.locate(): base is /users/theUser/ADCompare, name is props.txt Mar 23, 2010 12:12:33 PM org.apache.commons.configuration.ConfigurationUtils locate FINE: Loading configuration from the path /users/theUser/ADCompare/props.txt Mar 23, 2010 12:12:33 PM oracle.jdbc.driver.OracleDriver connect FINE: OracleDriver.connect(url=jdbc:oracle:thin:@//theServer:1521/theService, info) Mar 23, 2010 12:12:33 PM oracle.jdbc.driver.OracleDriver connect FINER: OracleDriver.connect() walletLocation:(null) Mar 23, 2010 12:12:33 PM oracle.jdbc.driver.OracleDriver parseUrl FINER: OracleDriver.parseUrl(url=jdbc:oracle:thin:@//theServer:1521/theService) Mar 23, 2010 12:12:33 PM oracle.jdbc.driver.OracleDriver parseUrl FINER: sub_sub_index=12, end=46, next_colon_index=16, user=17, slash=18, at_sign=17 Mar 23, 2010 12:12:33 PM oracle.jdbc.driver.OracleDriver parseUrl FINER: OracleDriver.parseUrl(url):return Mar 23, 2010 12:12:33 PM oracle.jdbc.driver.OracleDriver connect FINER: user=theUser, password=******, database=//theServer:1521/theService, protocol=thin, prefetch=null, batch=null, accumulate batch result =true, remarks=null, synonyms=null Mar 23, 2010 12:12:33 PM oracle.jdbc.driver.PhysicalConnection <init> FINE: PhysicalConnection.PhysicalConnection(ur="jdbc:oracle:thin:@//theServer:1521/theService", us="theUser", p="******", db="//theServer:1521/theService", info) Mar 23, 2010 12:12:33 PM oracle.jdbc.driver.PhysicalConnection <init> FINEST: PhysicalConnection.PhysicalConnection() : connectionProperties={user=theUser, password=******, protocol=thin} Mar 23, 2010 12:12:33 PM oracle.jdbc.driver.PhysicalConnection initialize FINE: PhysicalConnection.initialize(ur="jdbc:oracle:thin:@//theServer:1521/theService", us="theUser", access) Mar 23, 2010 12:12:33 PM oracle.jdbc.driver.PhysicalConnection initialize FINE: PhysicalConnection.initialize(ur, us):return Mar 23, 2010 12:12:33 PM oracle.jdbc.driver.PhysicalConnection needLine FINE: PhysicalConnection.needLine()--no return java.lang.ArrayIndexOutOfBoundsException: 31 at oracle.net.nl.NVTokens.parseTokens(Unknown Source) at oracle.net.nl.NVFactory.createNVPair(Unknown Source) at oracle.net.nl.NLParamParser.addNLPListElement(Unknown Source) at oracle.net.nl.NLParamParser.initializeNlpa(Unknown Source) at oracle.net.nl.NLParamParser.<init>(Unknown Source) at oracle.net.resolver.TNSNamesNamingAdapter.loadFile(Unknown Source) at oracle.net.resolver.TNSNamesNamingAdapter.checkAndReload(Unknown Source) at oracle.net.resolver.TNSNamesNamingAdapter.resolve(Unknown Source) at oracle.net.resolver.NameResolver.resolveName(Unknown Source) at oracle.net.resolver.AddrResolution.resolveAndExecute(Unknown Source) at oracle.net.ns.NSProtocol.establishConnection(Unknown Source) at oracle.net.ns.NSProtocol.connect(Unknown Source) at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1037) at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:282) at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:468) at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165) at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:839) at java.sql.DriverManager.getConnection(DriverManager.java:582) at java.sql.DriverManager.getConnection(DriverManager.java:185) The above exception is also thrown if I use OracleDataSource instead of the generic DriverManager.getConnection(). Any ideas on why the behavior is different in the different environments?

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  • MySQL to AppEngine

    - by Daniel Naito
    Hi Nick! How are you? I'm from Brazil and study at FATEC (college located in Brazil). I'm trying to learn about AppEngine. Now, I'm trying to load a large database from MySQL to AppEngine to perform some queries, but I don't know how i can do it. I did some testing with CSV files,but is there any way to perform the direct import from MySQL? This database is from Pentaho BI Server (www.pentaho.com). Thank you for your attention. Regards, Daniel Naito

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  • Faster bulk inserts in sqlite3?

    - by scubabbl
    I have a file of about 30000 lines of data I want to load into a sqlite3 database. Is there a faster way that generating insert statements for each line of data? The data is space delimited and maps directly to the sqlite3 table. Is there any sort of bulk insert method for adding volume data to a database? Has anyone devised some deviously wonderful way of doing this if it's not built in? I should preface this by asking is there a c++ way to do it from the API? Thanks.

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  • selected Rows/Line in QTableView copy to QClipboard

    - by Berschi
    Hi. First of all, sorry for bad English. It's about C++ and Qt. I have a SQLite-Database and I did it into a QSqlTableModel. To show the Database, I put that Model into a QTableView. Now I want to create a Method where the selected Rows (or the whole Line) will be copied into the QClipboard. After that I want to insert it into my OpenOffice.Calc-Document. But I have no Idea what to do with the "Selected"-SIGNAL and the QModelIndex and how to put this into the Clipboard. So can you please help me? Berschi

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  • How do I prevent duplicate entrys to mySQL?

    - by ggfan
    On my site, I have a form that users fill out to become a member. They fill out name, bday, email, etc. Then when they click submit, the data gets into mySQL. But sometimes when a user clicks submit many times or refreshes the page, the data gets inputted to the database more than once. How can I prevent this? Is there a code I can use to only let one set of data get into the database? This is also a problem in my comment section. I allow uses to put comments on people's profiles. But when they abuse the refresh button or submit button, I get like 10 of the same comments. Thanks.

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  • Slug ID's with the same name?

    - by James Jeffery
    I want to create slug URL's from a users title in my system. If a user types "The best way's to get slim; period!", then I want the slug to be "the-best-ways-to-get-slim-period". Also, if someone has already created a page with that title I want the slug to be "the-best-ways-to-get-slim-period-1". My question is how can I check the database before a record is created? Ok, obviously I am going to have to perform a check in the database, and then a write. That's 2 queries. Is this the normal way to do it? Also, are there any conventional regular expressions for filtering non alpha/number characters and replacing spaces with hyphens? Any help is much appreciated. Thanks.

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  • SQLCMD Restore works in Management Studio but not from DOS prompt

    - by Gautam
    Any idea why my Restore command works fine when run in Management Studio 2008 but not when run from the dos prompt? Shown below is the error when running from the dos prompt. C:\>SQLCMD -s local\SQL2008 -d master -Q "RESTORE DATABASE [Sample.Db] FROM DISK = N'C:\Sample.Db.bak' WITH FILE = 1, MOVE N'Sample.Db' TO N'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008\MSSQL\DATA\Sample.Db.mdf', MOVE N'Sample.Db_log' TO N'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008\MSSQL\DATA\Sample.Db_log.ldf', NOUNLOAD, REPLACE, STATS = 10" Msg 3634, Level 16, State 1, Server GAUTAM, Line 1 The operating system returned the error '32(The process cannot access the file because it is being used by another process.)' while attempting 'RestoreContainer::ValidateTargetForCreation' on 'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008\MSSQL\DATA\Sample.Db.mdf'. Msg 3156, Level 16, State 8, Server GAUTAM, Line 1 File 'Sample.Db' cannot be restored to 'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008\MSSQL\DATA\Sample.Db.mdf'. Use WITH MOVE to identify a valid location for the file. Msg 3634, Level 16, State 1, Server GAUTAM, Line 1 The operating system returned the error '32(The process cannot access the file because it is being used by another process.)' while attempting 'RestoreContainer::ValidateTargetForCreation' on 'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008\MSSQL\DATA\Sample.Db_log.ldf'. Msg 3156, Level 16, State 8, Server GAUTAM, Line 1 File 'Sample.Db_log' cannot be restored to 'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008\MSSQL\DATA\Sample.Db_log.ldf'. Use WITH MOVE to identify a valid location for the file. Msg 3119, Level 16, State 1, Server GAUTAM, Line 1 Problems were identified while planning for the RESTORE statement. Previous messages provide details. Msg 3013, Level 16, State 1, Server GAUTAM, Line 1 RESTORE DATABASE is terminating abnormally. However if I execute this directly in Management Studio 2008, it works fine: RESTORE DATABASE [Sample.Db] FROM DISK = N'C:\Sample.Db.bak' WITH FILE = 1, MOVE N'Sample.Db' TO N'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008\MSSQL\DATA\Sample.Db.mdf', MOVE N'Sample.Db_log' TO N'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008\MSSQL\DATA\Sample.Db_log.ldf', NOUNLOAD, REPLACE, STATS = 10 There is no lock or security issues, the data base doesn't exist on the server. I can't figure it out. Any ideas?

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  • Should an event-sourced aggregate root have query access to the event sourcing repository?

    - by JD Courtoy
    I'm working on an event-sourced CQRS implementation, using DDD in the application / domain layer. I have an object model that looks like this: public class Person : AggregateRootBase { private Guid? _bookingId; public Person(Identification identification) { Apply(new PersonCreatedEvent(identification)); } public Booking CreateBooking() { // Enforce Person invariants var booking = new Booking(); Apply(new PersonBookedEvent(booking.Id)); return booking; } public void Release() { // Enforce Person invariants // Should we load the booking here from the aggregate repository? // We need to ensure that booking is released as well. var booking = BookingRepository.Load(_bookingId); booking.Release(); Apply(new PersonReleasedEvent(_bookingId)); } [EventHandler] public void Handle(PersonBookedEvent @event) { _bookingId = @event.BookingId; } [EventHandler] public void Handle(PersonReleasedEvent @event) { _bookingId = null; } } public class Booking : AggregateRootBase { private DateTime _bookingDate; private DateTime? _releaseDate; public Booking() { //Enforce invariants Apply(new BookingCreatedEvent()); } public void Release() { //Enforce invariants Apply(new BookingReleasedEvent()); } [EventHandler] public void Handle(BookingCreatedEvent @event) { _bookingDate = SystemTime.Now(); } [EventHandler] public void Handle(BookingReleasedEvent @event) { _releaseDate = SystemTime.Now(); } // Some other business activities unrelated to a person } With my understanding of DDD so far, both Person and Booking are seperate aggregate roots for two reasons: There are times when business components will pull Booking objects separately from the database. (ie, a person that has been released has a previous booking modified due to incorrect information). There should not be locking contention between Person and Booking whenever a Booking needs to be updated. One other business requirement is that a Booking can never occur for a Person more than once at a time. Due to this, I'm concerned about querying the query database on the read side as there could potentially be some inconsistency there (due to using CQRS and having an eventually consistent read database). Should the aggregate roots be allowed to query the event-sourced backing store for objects (lazy-loading them as needed)? Are there any other avenues of implementation that would make more sense?

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  • Setting data source for reports in Crystal Reports 2008 Java (performance)

    - by Daniel
    Hi, we have Crystal Reports 2008 on the server, and use the Java SDK to display reports and convert them to PDF. Since the server hat its own database, we have to set the data source on the DatabaseController to make CR connect to this database. We do it like specified in the docs, and tried the functions in CRJavaHelper, but for a reason unknown to me setting the connection string takes 300ms to 1500ms. What is the fastest way to tell Crystal which datasource to use in its reports? I already saw a JNDI name somewhere, but i don't believe CR actually does a JNDI lookup to find an existing datasource, doesn't it?

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