Search DaniWeb - row-locking

Row locking using JDBC for SQL Server 14 Years Ago by sbhavan … number should not be repeated. I have to lock the row as a user reads the table and release it only… Re: How to implement row locking in MYSQL 10 Years Ago by Rizi004 … read other request will read the next row not that row. After reading the time row i have to update the status of… that row. i have developed a stored function and it works 95% … Re: How to implement row locking in MYSQL 10 Years Ago by ryantroop … think there is a built in way to lock a row. You may be able to be clever and use some… reads, meaning you are updating a column in the same row you are reading, which usually would cause a deadlock (or… be used in something like the column that flags the row as read. However, I personally would not go this route… How to implement row locking in MYSQL 10 Years Ago by Rizi004 … http://dev.mysql.com/doc/refman/5.5/en/innodb-locking-reads.html Thanks Rizwan Row locking ? 16 Years Ago by veledrom Hi, In what sql cases we should lock particular rows? Is it UPDATE and DELETE only. Thanks Re: Row locking ? 16 Years Ago by verruckt24 The DBMS will take care of that, you do not have to worry for that. Locking Rows 16 Years Ago by poeticinsanity …bit lost. I need a way to lock a single row of a table and then unlock it. We have …job table and picking the jobs labelled pending. Unfortunately, without locking and unlocking, the machines will, in milliseconds, pick the same…make this more efficient? I was thinking, lock the single row being accessed, then the other rows could be accessed by… Re: Locking Rows 16 Years Ago by ShawnCplus This depends on the database engine you're currently using. By default MySQL uses MyISAM (Also uses MyISAM internally). However, MyISAM only supports table-level locking so when you're writing it locks the entire table. InnoDB on the other hand uses row-level locking along with a host of other features like foreign key constraints Re: Locking Rows 16 Years Ago by Mikav6 … returned the next free rowid while updating status on the row. Optionally you could combine this with 3rd party MySQL UDF… a global variable for the id of the next pending row. If the variable is not defined (db restart, etc) …load it with the id of the first pending row (eliminating using select on the work table). - optionally use insert… Re: Locking Rows 16 Years Ago by poeticinsanity …. Due to this, any sort of update that labelled the row "in progress" of any kind is out of… more than one machine to try and access the same row, thus creating confusion and chaos. I don't know if… Re: How to implement row locking in MYSQL 10 Years Ago by ryantroop It is highly unlikely you will get a time stamp that perfectly matches another down to the millisecond. However, you can always do your query something like select MIN(id) where date = 'mydate' That way if you have an exact match, only the first id will be returned, and since it's first in the table they were obviously first to submit. Re: How to implement row locking in MYSQL 10 Years Ago by rubberman Having multiple readers of a table simultaneously is not a problem and you should not try to lock the table. Having one read it while another is trying to write to it is another issue. Most database implementations will deal with this automatically. If one is updating, but another tries to read the same record, if the system is set to allow "… Re: locking fields 16 Years Ago by bharatshivram … max value of a col ( postid) and inserting a new row that has the value max (postid) +1.. postid is a… VB.net MYSQL row lock 12 Years Ago by dre-logics … een othor user in the network. Can use innodb for row-based locking? Is this the correct command : SELECT ... LOCK IN SHARE… InnoDB Database issue 16 Years Ago by Harutyun …'m using MyIsam table engine. It may be table or row locking I think? Can anyone help me, please. Blog locking tool 14 Years Ago by balle …;SELECT * FROM blogcomment WHERE id='$start'"); while ($row = mysql_fetch_assoc($g)) { $locked = $row['locked']; if($row['locked']==1) { echo 'Sorry this blog post… Re: How to lock a database record/row ? 17 Years Ago by jbennet Thats up to the database software. E.g in MS Access, its you can choose database, table, record or field locking under properties (or something like that) Re: iframe content locking? 17 Years Ago by coat …10px; width:auto; } .dynamic-tab-pane-control .tab-row .tab { font-size:11px; cursor:pointer; display:inline;…buttonbar.gif"); } .dynamic-tab-pane-control .tab-row .tab.hover { background-position:top left; background-repeat:… font-family:Message-Box; } .dynamic-tab-pane-control .tab-row { z-index:1; white-space:nowrap; } .framemove { … Re: Blog locking tool 14 Years Ago by diafol What do you mean it does nothing? Nothing is displayed, the form is displayed, the F.Y. message is displayed? More into please. Re: VB.net MYSQL row lock 12 Years Ago by G_Waddell Hi You should try posting to the database forum, my MySQL knowledge is limited but someone there should help The MySql section is here: [Web Development, Databases, MySQL](http://www.daniweb.com/web-development/databases/mysql/126) Re: VB.net MYSQL row lock 11 Years Ago by dre-logics Thanks Re: One table - Multiple users - One mySQL query 11 Years Ago by Begginnerdev … in a command? On the back end you can implement [row locking](http://blog.sqlauthority.com/2007/04/27/sql-server-2005…-locking-hints-and-examples/), [but this can lead to problems if … do not commit their changes](http://www.sqlteam.com/article/row-locking). Re: MyISAM vs InnoDB 19 Years Ago by Dani … InnoDB has over MyISAM is that it supports row locking, while MyISAM only supports table locking. Therefore, if lots of reads and writes… small performance hit in exchange for not suffering from table locking issues. Re: MyISAM vs InnoDB 15 Years Ago by markainsworth …;http://dev.mysql.com/doc/refman/5.0/en/table-locking.html"]http://dev.mysql.com/doc/refman/5.0…/en/table-locking.html[/url][/QUOTE] There is another very good reason to… rows of) the same table concurrently, you really need the row locking functionality of INNODB. Re: How to merge text 15 Years Ago by drjohn … always overwrites the first one. In databases we use row locking and table locking to overcome this, which is why some databases can… be standalone and not shared - they don't all have locking mechanisms. The problem arose the day they invented networks and… Re: Concurrent Query ? 16 Years Ago by ShawnCplus …) does not support transactions. Also, InnoDB uses row-locking for reads/writes instead of table-locking. So if I'm doing a SELECT… effect so as soon as I'm done reading a row it will become freed. Re: Maintain heavy weight DB 10 Years Ago by veedeoo … or revert on the InnoDB. InnoDB is capable of row locking and micro locking mechanism. Innodb is being updated regularly while MyISAM is… Re: One table - Multiple users - One mySQL query 11 Years Ago by Begginnerdev … me if I am wrong, but I do beleive that row locking will be your only option to completely safeguard the data… keystroke?) Then reset the timer value to 0. Unlock the row @ 5 minutes ect... Re: innodb vs myisam 19 Years Ago by acescence … volumes, innodb for high update volumes due to table vs row locking. innodb is journaled, and can recover from crashes where myisam… Re: Best way to execute multiple db commands in a transaction 13 Years Ago by Momerath … thing to keep in mind is that SQL Server has row locking capability, and tries to use the least restrictive lock that…