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• slow record deletion with large ntext values

  - by asking

  I'm having trouble deleting some records via a stored procedure from a table in SQLServer 2008R2 that has ntext columns. The stored proc is timing out and running the query directly takes a very long time. The initial query was a straight "delete from y where x = z" and I've also tried running it in batches of 1000 with transactions but it is still slow and timing out in a stored proc. The majority of the records in the table will not be deleted each time (it's not just a once-off query but will be run other times). The ntext columns are not used in the where clause and I can't change the column types. Any suggestions on the quickest way to delete records with large ntext values? Thanks

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• mysql - offset problem

  - by Phil Jackson

  Hi, I recently posted a question about getting last 3 results in table in the correct order. I now want the get all comments apart from the last 3 in the correct order. Here is my syntax; SELECT * FROM (SELECT * FROM $table ORDER BY ID DESC OFFSET 3) AS T ORDER BY TIME_STAMP the error i am receiving is; You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'OFFSET, 3) AS T ORDER BY TIME_STAMP' at line 1 I can't seem to get it to work. Any help much appreciated.

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• CoreData and many NSArrayController

  - by unixo

  In my CoreData Application, I've an outline view on left of main window, acting as source list (like iTunes); on the right I display a proper view, based on outline selection. Each view has its components, such as table view, connected to array controller, owned by the specific view. Very often different views display same data, for example, a table view of the same entity. From a performance point of view, is better to have a single array controller per entity and share it between all views or does CoreData cache avoid memory waste?

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• UISearchbar issue

  - by hmthur

  I am trying to add a UISearchbar to table header view. I have the icon in nib and have connected the outlets. Now in viewDidLoad, I am writing self.tableView.tableHeaderView = searchbar If i create a local var inside viewDidLoad, it shows up. But not the outlet or ivar one. But for some reason, the UISearchbar does not get displayed in the table. I am not sure what the issue is. Can a UISearchbar not be set in viewDidLoad OR is it something else? Please help.

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• Calculate open timeslots given availability and existing appointments - by day

  - by Andre

  Overview: I have a table which stores a persons "availability" for a current day, e.g. Mon - 8:00am - 11:30am Mon - 1:30pm - 6:00pm A second table stores appointments that this person already has for the same day, e.g. Mon - 8:30am - 11:00am Mon - 2:30pm - 4pm Desired result: Doing calculationsI'd like to have the following result - e.g. "this person has availability on the given day": Mon - 8:00am - 8:30am Mon - 11:00am - 11:30am Mon - 1:30pm - 2:30pm Mon - 4:00pm - 6:00pm Any ideas on how to calculate the output given the two inputs (e.g. availability, existing appointments) would be greatly appreciated. Preferably I'd use javascript on the client to do the calculating as I would believe that doing it within the DB (I'm using MSSQL) would be slow for many records, persons, etc. Hope this is enough information to illustrate the problem at hand - Many thanks in advance.

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• scrolling a readonly cell in NSTableview?

  - by John Velman

  I have a table that the user should not be able to edit directly (although user actions may cause changes). One column may contain a string too long for any reasonable size cell, so to see everything there, the user needs to scroll the cell (using arrow keys, for example). If I make either the column or cell not editible, I loose the ability to scroll the cell. If I make it editable, of course, I loose the ability to keep the user from changeing it. (I'm using NSArray controller and a couple of NSObject controllers to get from the model to the table view using bindings. Binding compliance via @property(copy) and @synthesize. Updating the model with setXXXX:xxx). Thanks, John Velman

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• Need help optimizing MYSQL query with join

  - by makeee

  I'm doing a join between the "favorites" table (3 million rows) the "items" table (600k rows). The query is taking anywhere from .3 seconds to 2 seconds, and I'm hoping I can optimize it some. Favorites.faver_profile_id and Items.id are indexed. Instead of using the faver_profile_id index I created a new index on (faver_profile_id,id), which eliminated the filesort needed when sorting by id. Unfortunately this index doesn't help at all and I'll probably remove it (yay, 3 more hours of downtime to drop the index..) Any ideas on how I can optimize this query? In case it helps: Favorite.removed and Item.removed are "0" 98% of the time. Favorite.collection_id is NULL about 80% of the time. SELECT `Item`.`id`, `Item`.`source_image`, `Item`.`cached_image`, `Item`.`source_title`, `Item`.`source_url`, `Item`.`width`, `Item`.`height`, `Item`.`fave_count`, `Item`.`created` FROM `favorites` AS `Favorite` LEFT JOIN `items` AS `Item` ON (`Item`.`removed` = 0 AND `Favorite`.`notice_id` = `Item`.`id`) WHERE ((`faver_profile_id` = 1) AND (`collection_id` IS NULL) AND (`Favorite`.`removed` = 0) AND (`Item`.`removed` = '0')) ORDER BY `Favorite`.`id` desc LIMIT 50;

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• SQLite problem with some parameterized queries

  - by Trevor Balcom

  I am having some trouble using SQLite and parameterized queries with a few tables. I have noticed some queries using the "SELECT * FROM Table WHERE row=?" are returning 1 row when there should be more rows returned. If I change the parameterized query to "SELECT * FROM Table WHERE row='row'" then the correct number of rows is returned. Does anyone know why sqlite3_step would return only 1 row when using a parameterized query vs. using the same query in a traditional non-parameterized way? I am using a very thin C++ wrapper around SQLite3. I suspect there could be a problem with the wrapper, but this problem only exists on a few tables. It makes me wonder if there is something wrong with the way those tables are setup. Any advice is appreciated.

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• [JQuery] Highlight a Radio field and then pop up an input text box field

  - by kwokwai

  Hi all, I am trying to make some dynamic effect to a HTML page using JQuery. 1. When the user clicks a Radio feild, the field will be highlighted. 2. When the user clicks the Radio 'Man', a Input text box will be provided immeditely just below it. Here is my simple HTML page, but I don't know how to do with the JQuery part: <Table> <TR> <TD>Gender</TD> <TD> Man: <INPUT type=radio name="gender" value="M"><Br/> Woman: <INPUT type=radio name="gender" value="F"> </TD> </TR> <?Table>

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• What data structure would be the least painful DataTable replacement?

  - by MatthewMartin

  I'm storing a lot of sorted ~10 row 2 column/key value pairs in ASP.NET cache-- they're the data for dropdownlists. Right now they are all DataTables, which isn't very space efficient (the rule of thumb is 10x increase in size when data is strored in a dataset). Old Code DataTable table = dataAccess.GetDataTable(); dropDownList.DataSource = table; Hoped for new Code Unknown data = dataAccess.GetSomethingMoreSpaceEfficient(); dropDownList.DataSource = data; What pre-existing datastructures are similar enough to DataTable that would minimize code breakage and reduce the serialized size when stored in ASP.NET cache?

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• Problem with altering model attributes in controller

  - by SpawnCxy

  Hi all, Today I've got a problem when I tried using following code to alter the model attribute in the controller function userlist($trigger = 1) { if($trigger == 1) { $this->User->useTable = 'betausers'; //'betausers' is completely the same structure as table 'users' } $users = $this->User->find('all'); debug($users); } And the model file is class User extends AppModel { var $name = "User"; //var $useTable = 'betausers'; function beforeFind() //only for debug { debug($this->useTable); } } The debug message in the model showed the userTable attribute had been changed to betausers.And It was supposed to show all records in table betausers.However,I still got the data in the users,which quite confused me.And I hope someone can show me some directions to solve this problem. Regards

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• Why does this work in Firefox but not IE and how can I fix it?

  - by bstullkid

  I want to show and hide rows of a table based on the value of a select box and this works in Firefox but not IE: <select onChange="javascript: toggle(this.value);"> <option value="cat0">category 0</option> <option value="cat1">category 1</option> </select> <table> <tr name="cat0"> <td>some stuff v</td> <td>some stuff v</td> </tr> <tr name="cat0"> <td>some stuff d</td> <td>some stuff d</td> </tr> <tr name="cat1"> <td>some stuff a</td> <td>some stuff a</td> </tr> <tr name="cat1"> <td>some stuff b</td> <td>some stuff b</td> </tr> </table> <script type="text/javascript"> function toggle(category) { // turn everything off for (var i = 0; i < 2; i++) { var cat = document.getElementsByName('cat' + i); for (var j = 0; j < cat.length; j++) cat[j].style.display = 'none'; } // turn on category chosen var cat = document.getElementsByName(category); for (var i = 0; i < cat.length; i++) cat[i].style.display = ''; } // start by showing cat0 toggle('cat0'); </script>

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• Wix Installer - How to customize FatalError dialog based on server actions

  - by Paul

  I need to display different messages in the FatalError dialog depending on what caused the installation to fail. My first attempt was to make the FatalError description text point to a property, and then set this property's value when an error appeared. The problem is that this dialog runs in the InstallUISequence table and the problematic actions in the InstallExecuteSequence table, and apparently the values that are set during InstallExecuteSequence are not copied back to the UI, and thus I'm losing them when the dialog is created. Any ideas on how to solve this? Thanks!

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• How to perform a join with CodeIgniter's Active Record class on a multicolumn key?

  - by Scott Southworth

  I've been able to make this code work using CodeIgniter's db->query as follows: $sql = 'SELECT mapping_code,zone_name,installation_name FROM installations,appearances,zones WHERE installations.installation_id = zones.installation_fk_id AND appearances.installation_fk_id = installations.installation_id AND appearances.zone_fk_id = zones.zone_id AND appearances.barcode = ? '; return $this->db->query($sql,array($barcode)); The 'appearances' table throws a 'not unique table' error if I try this using the Active Record class. I need to join appearances on both the zone and installations tables. How can I do this?

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• Hibernate, alter identifier/primary key

  - by Schildmeijer

  I receive the following exception when Im trying to alter my @ID in an @Entity. identifier of an instance of com.google.search.pagerank.ItemEntity was altered from 1 to 2. I know that im altering the primary key in my table. Im using JPA-annotations. I solved this by using this single HQL query: update Table set name=:newName where name=:oldName instead of using the more oo approach: beginTransaction(); T e = session.load(...); e.setName(newName); session.saveOrUdate(e); commit(); Any idea what the diff is?

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• SQL 2008 Select Top 1000 and update the selected database drop-down

  - by CWinKY

  When you right click and do a Select top 1000 rows from a table in sql 2008, it opens a tab and writes the sql and then executes it. This is okay, however I'll erase the sql and use the same tab often to do other sql statements. What annoys me is that I have to go to the database drop-down at the top of the window and change it to the current database I'm in because it says Master. How can I make sql 2008 update the selected database for this tab automatically when I right click a table and do select top 1000? On a side note, can I automatically hide the select statement that it generates and just show grid of results?

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• SQL Server 2008 - Get Geography From Record

  - by user336786

  Hello, I am new to using the geography types in SQL Server 2008. I have a table in my database called "Location". "Location" has the following columns and types: Location -------- City nvarchar(256) State nvarchar(256) PostalCode nvarchar(25) Latitude decimal(9, 6) Longitude decimal(9, 6) Each Location is related to a Store record in my database. I am trying to find the stores within a 10 mile radius or postal code or city/state that a user enters. To accomplish this, I know that I need to rely on geographies. At this time I have: DECLARE @startingPoint geography; SET @startingPoint=geography::STGeomFromText('POINT(-122.34900 47.65100)', 4326); That gives me the starting point from a hard-coded textual value. However, I do not know how to convert a lat/long from my Location table into a geography instance. How do I convert a lat/long in my database to a geography instance so I can continue to work on my query? Thank you!

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• MySQL - Join as zero if record Not IN

  - by Zurahn

  To explain by example, take two tables, A and B Table A id foo 1 x 2 y 3 z Table B id aid bar 1 3 50 2 1 100 An example join SELECT foo, bar FROM a, b WHERE a.id = b.aid; Garners a result of foo bar z 50 x 100 What I would like to do is get all values of foo and for any instances where there isn't a corresponding bar value, return 0 for that column. My best guess was something along the lines of SELECT foo, bar AS br FROM a, b WHERE a.id = b.aid OR a.id NOT IN (SELECT aid FROM b); But that returns duplicates and non-zero values for bar. Possible?

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• In a virtual machine monitor such as VMware's ESXi Server, how are shadow page tables implemented?

  - by ali01

  My understanding is that VMMs such as VMware's ESXi Server maintain shadow page tables to map virtual page addresses of guest operating systems directly to machine (hardware) addresses. I've been told that shadow page tables are then used directly by the processor's paging hardware to allow memory access in the VM to execute without translation overhead. I would like to understand a bit more about how the shadow page table mechanism works in a VMM. Is my high level understanding above correct? What kind of data structures are used in the implementation of shadow page tables? What is the flow of control from the guest operating system all the way to the hardware? How are memory access translations made for a guest operating system before its shadow page table is populated? How is page sharing supported? Short of straight up reading the source code of an open source VMM, what resources can I look into to learn more about hardware virtualization?

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• jquery on click sibling selection

  - by Deviland

  I generate a Table from a database to look like this <table id="items"> <thead> <tr> <th>Details</th> <th>Goldmine ID</th> <th>&nbsp;</th> </tr> </thead> <tbody> <tr> <td class="evenrow">This is a test Description generated through UNIT Tests for the category description</td> <td class="evenrow"><input type="text" value="" id="106" class="gminput"></td> <td class="butCell evenrow"><button class="saveButton updateitem">Update</button></td> </tr> <tr> <td class="oddrow">This is a test Description generated through UNIT Tests for the category description</td> <td class="oddrow"><input type="text" value="" id="107" class="gminput"></td> <td class="butCell oddrow"><button class="saveButton updateitem">Update</button></td> </tr> <tr> <td class="evenrow">This is a test Description generated through UNIT Tests for the category description</td> <td class="evenrow"><input type="text" value="" id="108" class="gminput"></td> <td class="butCell oddrow"><button class="saveButton updateitem">Update</button></td> </tr> </tbody> </table> I am trying to get the input box value and id returned by the relevant row's button click so far I have tried this but failed $('body').on('click', '.updateitem', function(event) { event.preventDefault(); $(this).parent().siblings().forEach(function(index) { alert(($(this).val())); }); var par = sib.parent('td'); par.addClass('redBorder'); });

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• Paging in SQL Server problems

  - by Manh Trinh

  I have searched for paging in SQL Server. I found most of the solution look like that What is the best way to paginate results in SQL Server But it don't meet my expectation. Here is my situation: I work on JasperReport, for that: to export the report I just need pass the any Select query into the template, it will auto generated out the report EX : I have a select query like this: Select * from table A I don't know any column names in table A. So I can't use Select ROW_NUMBER() Over (Order By columsName) And I also don't want it order by any columns. Anyone can help me do it? PS: In Oracle , it have rownum very helpful in this case. Select * from tableA where rownum > 100 and rownum <200 Paging with Oracle

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• How to remove an element without id

  - by Bryan

  I have the following code: <table> <tr width="100%"> <td width="130" /> <td id="BottomCell" width="100%" /> <tr> </table> <input type="button"/> I want the first td to be removed from tr when the button is clicked. How can I do this? Thanks.

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• MySQL Locks: order of unblocked threads

  - by teehoo

  I have a MySQL ISAM table being accessed my multiple php instances. Right now I'm using a WRITE lock to serialize access to this table. My question is how do I ensure that the PHP instances get served on a First-Come-First-Serve basis? Or is this the default behaviour? The official MySQL documentation doesn't mention anything about the blocked thread order for threads of the same lock type (ie multiple threads attempting a WRITE LOCK). It only mentions that a WRITER will jump to the front of the waiting queue if READERS are waiting.

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• Referencing outer query's tables in a subquery

  - by soulmerge

  Is it possible to reference an outer query in a subquery with MySQL? I know there are some cases where this is possible: SELECT * FROM table t1 WHERE t1.date = ( SELECT MAX(date) FROM table t2 WHERE t2.id = t1.id)` ); But I'm wondering if something like this could work: SELECT u.username, c._postCount FROM User u INNER JOIN ( SELECT p.user, COUNT(*) AS _postCount FROM Posting p --# This is the reference I would need: WHERE p.user = u.id ) c ON c.user = u.id WHERE u.joinDate < '2009-10-10'; I know I could achieve the same using a GROUP BY or by pulling the outer WHERE clause into the sub-query, but I need this for automatic SQL generation and cannot use either alternative for various other reasons.

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• MySQL Prepared Statements vs Stored Procedures Performance

  - by amardilo

  Hi there, I have an old MySQL 4.1 database with a table that has a few millions rows and an old Java application that connects to this database and returns several thousand rows from this this table on a frequent basis via a simple SQL query (i.e. SELECT * FROM people WHERE first_name = 'Bob'. I think the Java application uses client side prepared statements but was looking at switching this to the server, and in the example mentioned the value for first_name will vary depending on what the user enters). I would like to speed up performance on the select query and was wondering if I should switch to Prepared Statements or Stored Procedures. Is there a general rule of thumb of what is quicker/less resource intensive (or if a combination of both is better)

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