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  • add row to a BindingSource gives different autoincrement value from whats saved into DB

    - by Ruben Trancoso
    I have a DataGridView that shows list of records and when I hit a insert button, a form should add a new record, edit its values and save it. I have a BindingSource bound to a DataGridView. I pass is as a parameter to a NEW RECORD form so // When the form opens it add a new row and de DataGridView display this new record at this time DataRowView currentRow; currentRow = (DataRowView) myBindindSource.AddNew(); when user confirm to save it I do a myBindindSource.EndEdit(); // inside the form and after the form is disposed the new row is saved and the bindingsorce position is updated to the new row DataRowView drv = myForm.CurrentRow; avaliadoTableAdapter.Update(drv.Row); avaliadoBindingSource.Position = avaliadoBindingSource.Find("ID", drv.Row.ItemArray[0]); The problem is that this table has a AUTOINCREMENT field and the value saved may not correspond the the value the bindingSource gives in EDIT TIME. So, when I close and open the DataGridView again the new rowd give its ID based on the available slot in the undelying DB at the momment is was saved and it just ignores the value the BindingSource generated ad EDIT TIME, Since the value given by the binding source should be used by another table as a foreingKey it make the reference insconsistent. There's a way to get the real ID was saved to the database?

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  • question about MySQL database migration

    - by WilliamLou
    Hi there: If I have a MySQL database with several tables on a live server, now I would like to migrate this database to another server. Of course, the migration I mean here involves some database tables, for example: add some new columns to several tables, add some new tables etc.. Now, the only method I can think of is to use some php/python(two scripts I know) script, connect two databases, dump the data from the old database, and then write into the new database. However, this method is not efficient at all. For example: in old database, table A has 28 columns; in new database, table A has 29 columns, but the extra column will have default value 0 for all the old rows. My script still needs to dump the data row by row and insert each row into the new database. Is there any tools or a better method than writing a script yourself? Here, I dont need to worry about multithread writing problems etc.., I mean the old database will be down (not open to public usage etc.., only for upgrade ) for a while. Thanks!!

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  • slow SQL command

    - by Retrocoder
    I need to take some data from one table (and expand some XML on the way) and put it in another table. As the source table can have thousands or records which caused a timeout I decided to do it in batches of 100 records. The code is run on a schedule so doing it in batches works ok for the customer. If I have say 200 records in the source database the sproc runs very fast but if there are thousands it takes several minutes. I'm guessing that the "TOP 100" only takes the top 100 after it has gone through all the records. I need to change the whole code and sproc at some point as it doesn't scale but for now is there a quick fix to make this run quicker ? INSERT INTO [deviceManager].[TransactionLogStores] SELECT TOP 100 [EventId], [message].value('(/interface/mac)[1]', 'nvarchar(100)') AS mac, [message].value('(/interface/device) [1]', 'nvarchar(100)') AS device_type, [message].value('(/interface/id) [1]', 'nvarchar(100)') AS device_id, [message].value('substring(string((/interface/id)[1]), 1, 6)', 'nvarchar(100)') AS store_id, [message].value('(/interface/terminal/unit)[1]', 'nvarchar(100)') AS unit, [message].value('(/interface/terminal/trans/event)[1]', 'nvarchar(100)') AS event_id, [message].value('(/interface/terminal/trans/data)[1]', 'nvarchar(100)') AS event_data, [message].value('substring(string((/interface/terminal/trans/data)[1]), 9, 11)', 'nvarchar(100)') AS badge, [message].value('(/interface/terminal/trans/time)[1]', 'nvarchar(100)') AS terminal_time, MessageRecievedAt_UTC AS db_time FROM [deviceManager].[TransactionLog] WHERE EventId > @EventId --WHERE MessageRecievedAt_UTC > @StartTime AND MessageRecievedAt_UTC < @EndTime ORDER BY terminal_time DESC

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  • Beginner's guide for rails

    - by piemesons
    Hello friends i need a book/ tutorials for rails without using scoffold. All the books mentioned in the other questions are creating some depot application or etc using scaffold and then explaining things. I believe in the thing that creating big depot is worthless when you are not getting anything. All of my frnds are suggesting me to go for this pragmatic book. look i understand the book is good but i m not getting the proper things. I got the logic cause i m good in php doctrine. asp.net c c++ so i m getting the things but i m not feeling confident. I want to have a another book. Can anybody suggest me some other books. I m saying this cause it really feels good when u create a simple form and insert the values in db and u can retreive those values and MOST IMP you can explain the whole logic of the that small form application instaed of that colorfull Depot application in which things are done with scaffold and u r not getting the thing and u are confused abt the real picture.

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  • Mysql error in stored procudure

    - by devuser
    This stored procedure is to search through all tables and columns in database. DELIMITER $$ DROP PROCEDURE IF EXISTS get_table $$ CREATE /*[DEFINER = { user | CURRENT_USER }]*/ PROCEDURE `auradoxdb`.`get_table`(in_search varchar(50)) READS SQL DATA BEGIN DECLARE trunc_cmd VARCHAR(50); DECLARE search_string VARCHAR(250); DECLARE db,tbl,clmn CHAR(50); DECLARE done INT DEFAULT 0; DECLARE COUNTER INT; DECLARE table_cur CURSOR FOR SELECT concat(SELECT COUNT(*) INTO @CNT_VALUE FROM `’,table_schema,’`.`’,table_name,’` WHERE `’, column_name,’` REGEXP ”’,in_search,”’) ,table_schema,table_name,column_name FROM information_schema.COLUMNS WHERE TABLE_SCHEMA NOT IN (‘information_schema’,'test’,'mysql’); DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=1; # #Truncating table for refill the data for new search. PREPARE trunc_cmd FROM “TRUNCATE TABLE temp_details;” EXECUTE trunc_cmd ; OPEN table_cur; table_loop:LOOP FETCH table_cur INTO search_string,db,tbl,clmn; # #Executing the search SET @search_string = search_string; SELECT search_string; PREPARE search_string FROM @search_string; EXECUTE search_string; SET COUNTER = @CNT_VALUE; SELECT COUNTER; IF COUNTER>0 THEN # # Inserting required results from search to tablehhh INSERT INTO temp_details VALUES(db,tbl,clmn); END IF; IF done=1 THEN LEAVE table_loop; END IF; END LOOP; CLOSE table_cur; # #Finally Show Results SELECT * FROM temp_details; END $$ DELIMITER ; Following error occurs when execute this.. Error Code : 1064 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 'SELECT COUNT(*) INTO @CNT_VALUE FROM `’,table_schema,’`.`’,table_name,’`' at line 12 (0 ms taken) could any body please help me to solve this?

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  • AJAX HTML PHP question

    - by Jordan Pagaduan
    This is my scripts.js function showHint(str) { if (str.length==0) { document.getElementById("txtHint").innerHTML=""; return; } if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("txtHint").innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET","inputProcess.php?q="+str,true); xmlhttp.send(); } This is my HTML <script type="text/javascript" src="scripts.js"></script> <form> Type your name here : <input type="text" onkeypress="showHint(this.value)" name="name" /> </form> This is my PHP file <?php $q = $_GET['q']; $dbc=mysql_connect("localhost","root","") or die (mysql_error()); mysql_select_db('input_oop') or die (mysql_error()); $sql = "INSERT INTO users set name = '".$q."'"; mysql_query($sql) or die (mysql_error()); ?> When the text is save in my database it will save 5 times or up.

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  • Creating self-referential tables with polymorphism in SQLALchemy

    - by Jace
    I'm trying to create a db structure in which I have many types of content entities, of which one, a Comment, can be attached to any other. Consider the following: from datetime import datetime from sqlalchemy import create_engine from sqlalchemy import Column, ForeignKey from sqlalchemy import Unicode, Integer, DateTime from sqlalchemy.orm import relation, backref from sqlalchemy.ext.declarative import declarative_base Base = declarative_base() class Entity(Base): __tablename__ = 'entities' id = Column(Integer, primary_key=True) created_at = Column(DateTime, default=datetime.utcnow, nullable=False) edited_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False) type = Column(Unicode(20), nullable=False) __mapper_args__ = {'polymorphic_on': type} # <...insert some models based on Entity...> class Comment(Entity): __tablename__ = 'comments' __mapper_args__ = {'polymorphic_identity': u'comment'} id = Column(None, ForeignKey('entities.id'), primary_key=True) _idref = relation(Entity, foreign_keys=id, primaryjoin=id == Entity.id) attached_to_id = Column(Integer, ForeignKey('entities.id'), nullable=False) #attached_to = relation(Entity, remote_side=[Entity.id]) attached_to = relation(Entity, foreign_keys=attached_to_id, primaryjoin=attached_to_id == Entity.id, backref=backref('comments', cascade="all, delete-orphan")) text = Column(Unicode(255), nullable=False) engine = create_engine('sqlite://', echo=True) Base.metadata.bind = engine Base.metadata.create_all(engine) This seems about right, except SQLAlchemy doesn't like having two foreign keys pointing to the same parent. It says ArgumentError: Can't determine join between 'entities' and 'comments'; tables have more than one foreign key constraint relationship between them. Please specify the 'onclause' of this join explicitly. How do I specify onclause?

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  • What happens to my PriorityQueue if my Comparator throws an exception while it's busy bubbling up or

    - by nieldw
    Hi, I'm trying order pairs of integers ascendantly where a pair is considered less than another pair if both its entries are strictly less than those of the other pair, and larger than the other pair if both its entries are strictly larger than those of the other pair. All other cases are considered incomparable. They way I want to solve this is by defining a Comparator that implements the above, but will throw an exception for incomparable cases, and provide that to a PriorityQueue. Of course, while inserting a pair the priority queue does several comparisons while bubbling the new entry up to its correct position in the heap, and many of these will be comparable. But it may happen during the bubbling process that a pair is encountered with which this new pair is incomparable, and an exception will be thrown. If this happens, what will be the state of the PriorityQueue? Will the pair I was trying to insert sit in the heap at the last position it was in before the exception was thrown? If I use the PriorityQueue's remove(Object o) method, will the PriorityQueue be restored to a consistent state? Thanks

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  • Dynamic checkboxlist

    - by Steve
    Hi, I am currently building a dynamic url tab system that user can say what urls they want to be displayed on a tabpage control. In the database i have the following columns. userID, int URLName var Enabled bit I am pulling the data back ok but what i am trying do is populate a checkbox list with the urlname and its status on a user options page so they can say what tabs they want displayed. I have wrote the following methods to get the urls and create the checkboxes however i keep getting the following error. ex = {"InvalidArgument=Value of '1' is not valid for 'index'.\r\nParameter name: index"} It reads the first row ok but when it hits the 2nd row that is being returned i get that error. Has anyone got any ideas? Thanks private void GetUserURLS() { db.initiateCommand("[Settings].[LoadAllUserURLS]", CommandType.StoredProcedure); sqlp = db.addParameter("@UserID", _UserID, SqlDbType.Int, ParameterDirection.Input); sqlp = db.addParameter("@spErrorID", DBNull.Value, SqlDbType.Int, ParameterDirection.InputOutput); db.executeCommand(); CreateCheckBoxes(db.getTable(0).Rows); db.releaseCommand(); } private void CreateCheckBoxes(DataRowCollection rows) { try { int i = 0; foreach (DataRow row in rows) { //Gets the url name and path when the status is enabled. The status of Enabled / Disabled is setup in the users option page string URLName = row["URLName"].ToString(); bool enabled = Convert.ToBoolean(row["Enabled"]); CheckedListBox CB = new CheckedListBox(); CB.Items.Insert(i, URLName); CB.Tag = "CB" + i.ToString(); checkedListBox1.Items.Add(CB); i++; } } catch (Exception ex) { //Log error Functionality func = new Functionality(); func.LogError(ex); //Error message the user will see string FriendlyError = "There has been populating checkboxes with the urls - A notification has been sent to development"; Classes.ShowMessageBox.MsgBox(FriendlyError, "There has been an Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } }

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  • Hibernate: Check if object exists/changed

    - by swalkner
    Assuming I have an object Person with long id String firstName String lastName String address Then I'm generating a Person-object somewhere in my application. Now I'd like to check if the person exists in the database (= firstname/lastname-combination is in the database). If not = insert it. If yes, check, if the address is the same. If not = update the address. Of course, I can do some requests (first, try to load object with firstname/lastname), then (if existing), compare the address. But isn't there a simpler, cleaner approach? If got several different classes and do not like to have so many queries. I'd like to use annotations as if to say: firstname/lastname = they're the primary key. Check for them if the object exists. address is the parameter you have to compare if it stayed the same or not. Does Hibernate/JPA (or another framework) support something like that? pseude-code: if (database.containsObject(person)) { //containing according to compound keys if (database.containsChangedObject(person)) { database.updateObject(person); } } else { database.insertObject(person); }

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  • TinyMce imagemanager won't generate image path when used with an iframe

    - by Tom
    I have successfully setup tinymce to work on a page within an iframe. Everything works perfectly. However, when you use imagemanager to pick an image to be inserted or replaced in the editor it will not copy the path(and filename) of the image to the "Image URL" input in the "Insert/edit image" box. The box will either remain empty or keep the address of the previous image. The behaviour is the same with the filemanager plugin. tinyMCE.init( { mode : "none", editor_selector : "mceEditor", theme : "advanced", plugins : "filemanager,imagemanager,autoresize,safari,pagebreak,style,layer,table,save,advhr,advimage,advlink,emotions,iespell,insertdatetime,preview,media,searchreplace,print,contextmenu,paste,directionality,fullscreen,noneditable,visualchars,nonbreaking,xhtmlxtras,template,inlinepopups,spellchecker", theme_advanced_buttons1 : "insertfile,insertimage,advimage,imagemanager,bold,italic,underline,|,justifyleft,justifycenter,justifyright,justifyfull,nonbreaking,cut,copy,paste,pastetext,pasteword,|,search,replace,|,bullist,numlist", theme_advanced_buttons2 : "blockquote,|,link,unlink,anchor,image,cleanup,help,code,|,insertdate,inserttime,|,forecolor,backcolor,|,charmap,iespell,media,advhr", theme_advanced_layout_manager : "SimpleLayout", theme_advanced_buttons3 : "tablecontrols,|,hr,removeformat,visualaid,|,sub,sup,strikethrough", theme_advanced_buttons4 : "styleselect,formatselect,fontselect,fontsizeselect,|,undo,redo,|,spellchecker", theme_advanced_toolbar_location : "external", theme_advanced_toolbar_align : "left", theme_advanced_statusbar_location : "bottom", relative_urls : true, document_base_url : "http://devtom.ecitb.org.uk/", auto_resize : true, content_css : "/custom/css/style.css", extended_valid_elements : "iframe[height|width|src|frameborder|scrolling]", }); /* The following code comes from- http://tinymce.moxiecode.com/punbb/viewtopic.php?id=12966 Without it the editor only loads 10% of the time. With it, it's pretty much 100% consistent. The other changes mentioned in the post have also been implemented. */ var setupTiny = function() { var ifrObj = document.getElementById('pageEditIFrame'); var win = ifrObj; if (win.contentWindow) { win = win.contentWindow; } var d; if(ifrObj.contentDocument) { d = ifrObj.contentDocument; } else if (ifrObj.contentWindow) { d = ifrObj.contentWindow.document; } else if (ifrObj.document) { d = ifrObj.document; } textAreas.each(function(txtEl) { tinyMCE.execCommand('mceAddFrameControl', false, { element_id : txtEl, window : win, doc : d }); }); }; //Waiting 1 second seems to make the editor load more reliably. setTimeout("setupTiny();",1000);

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  • How should I handle this Optimistic Concurrency error in this Entity Framework code, I have?

    - by Pure.Krome
    Hi folks, I have the following pseduo code in some Repository Pattern project that uses EF4. public void Delete(int someId) { // 1. Load the entity for that Id. If there is none, then null. // 2. If entity != null, then DeleteObject(..); } Pretty simple but I'm getting a run-time error:- ConcurrencyException: Store, Update, Insert or Delete statement affected an unexpected number of rows (0). Now, this is what is happening :- Two instances of EF4 are running inthe app at the same time. Instance A calls delete. Instance B calls delete a nano second later. Instance A loads the entity. Instance B also loads the entity. Instance A now deletes that entity - cool bananas. Instance B tries to delete the entity, but it's already gone. As such, the no-count or what not is 0, when it expected 1 .. or something like that. Basically, it figured out that the item it is suppose to delete, didn't delete (because it happened a split sec ago). I'm not sure if this is like a race-condition or something. Anyways, is there any tricks I can do here so the 2nd call doesn't crash? I could make it into a stored procedure.. but I'm hoping to avoid that right now. Any ideas? I'm wondering If it's possible to lock that row (and that row only) when the select is called ... forcing Instance B to wait until the row lock has been relased. By that time, the row is deleted, so when Instance B does it's select, the data is not there .. so it will never delete.

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  • Location redirect - is tracking possible ?

    - by Gerald Ferreira
    Hi there, I was wondering if someone can help me, I have the following script that redirect users to an affiliate link when they click on a banner. <?php $targets = array( 'site1' => 'http://www.site1.com/', 'site2' => 'http://www.site2.com/', 'site3' => 'http://www.site3.com/', 'site4' => 'http://www.site4.com/', ); if (isset($targets[$_GET['id']])) { header('Location: '.$targets[$_GET['id']]); exit; } ?> Is it possible to track when a user hits the banner telling me the referer site as well as the ip address of the person clicking on the banner. hmmmm something like pixel tracking? I have tried to add an iframe that does the tracking but it creates an error Hope it makes sense Thanks! This is more or less how I would have done it in asp <% var Command1 = Server.CreateObject ("ADODB.Command"); Command1.ActiveConnection = MM_cs_stats_STRING; Command1.CommandText = "INSERT INTO stats.g_stats (g_stats_ip, g_stats_referer) VALUES (?, ? ) "; Command1.Parameters.Append(Command1.CreateParameter("varg_stats_ip", 200, 1, 20, (String(Request.ServerVariables("REMOTE_ADDR")) != "undefined" && String(Request.ServerVariables("REMOTE_ADDR")) != "") ? String(Request.ServerVariables("REMOTE_ADDR")) : String(Command1__varg_stats_ip))); Command1.Parameters.Append(Command1.CreateParameter("varg_stats_referer", 200, 1, 255, (String(Request.ServerVariables("HTTP_REFERER")) != "undefined" && String(Request.ServerVariables("HTTP_REFERER")) != "") ? String(Request.ServerVariables("HTTP_REFERER")) : String(Command1__varg_stats_referer))); Command1.CommandType = 1; Command1.CommandTimeout = 0; Command1.Prepared = true; Command1.Execute(); %> I am not sure how to do it in php - unfortunately for me the hosting is only supporting php so I am more or less clueless on how to do it in php I was thinking if I can somehow call a picture I can do it with pixel tracking in anoter asp page, on another server. Hope this makes better sense

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  • Pear HTML BBcode Hyperlink

    - by rrrfusco
    Has anyone used the PEAR HTML BBcode Package? I don't really understand why hyperlink target _blank does not open a new tab in firefox. INSERT Snippet [url=http://site.com t=_blank]Link[/url] PHP Require PEAR require_once 'HTML/BBCodeParser.php'; $options = @parse_ini_file('BBCodeParser.ini'); $parser = new HTML_BBCodeParser($options); $parser->setText($text); $parser->parse(); echo $parser->getParsed(); BBCodeParser.ini [HTML_BBCodeParser] ; http://articles.sitepoint.com/article/bb-code-php-application/ ; possible values: single|double ; use single or double quotes for attributes quotestyle = double ; possible values: all|nothing|strings ; quote all attribute values, none, or only the strings quotewhat = all ; the opening tag character open = "[" ; the closing tag character close = "]" ; possible values: true|false ; use xml style closing tags for single html tags (<img> or <img />) xmlclose = true ; possible values: a comma seperated list of filters ; comma seperated list of filters to use filters = Basic,Extended,Links,Images,Lists ; filters = Basic,Extended,Links,Images,Lists,Email,MyBB

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  • ASP Menu driving me insane

    - by simplesimon
    Hi there, I am trying to create a menu using ASP (I have never used ASP before, im a PHP man) using values stored in a database. basically the html layout i want is as such: <ul> <li> <ul class="sub-menu"> <li class="sub-menu-li">Test</li> </ul> </li> </ul> I need to loop around the root menu items rs("AD_Level") which is equal to 0 for root objects, then inside that loop, lop around anything that has the same parent id eg if the current record is AD_Level =0 and AD_Parent=5 then loop around all items with AD_Parent 5 and AD_Level != 0 and insert the values into html and so on and so forth. Please help! I am struggling with a new language and cannot see a way to do this without losing sanity Edit (Extracted from Comment by OP) while not rsAdmin.eof sPar = rsAdmin("ad_parent" if rsAdmin("AD_Level")=0 then while not rsAdmin2.eof if rsAdmin2("AD_Level")<>0 and rsAdmin2("ad_parent")=sPar and rsAdmin2("AD_Sec_Level")=>2 then response.write rsAdmin("AD_Menu") end if rsAdmin2.movenext wend end if '' # if not rsAdmin.eof then sPar=rsAdmin("AD_parent") rsAdmin.movenext wend that is my code

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  • compiler directive defensive programming for adding ints to nsmuatablearray FMDB/EGODB

    - by johndpope
    I would like to throw a warning message when users try to add an int to an nsmutablearray basically any insert statement that includes values that are not nsstring / nsnumber cause run time crashes. It's exactly the same crash you get when you type %@ instead of %d NSLog(int); The crash is ok, but I want to throw a friendly 'FATAL' message to user. so far I have this try catch with isKindOfClass NSObject but ints are slipping through. #define FATAL_MSG "FATAL: object is not an NSObject subclass. Are you using int? use [NSNumber numberWithInt:1] \n" #define VAToArray(firstarg) ({\ NSMutableArray* valistArray = [NSMutableArray array];\ id obj = nil;\ va_list arguments;\ va_start(arguments, sql);\ @try { \ while ((obj = va_arg(arguments, id))) {\ if([obj isKindOfClass:[NSObject class]]) [valistArray addObject:obj];\ else printf(FATAL_MSG); \ }\ } \ @catch(NSException *exception){ \ printf(FATAL_MSG); \ } \ va_end(arguments);\ valistArray;\ }) - (void)test:(NSString*)sql,... { NSLog(@"VAToArray :%@",VAToArray(sql)); } // then call this [self test:@"str",@"test",nil]; when I call this [self test:@"str",2,nil]; throw the error message.

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  • Optimizing MySQL for ALTER TABLE of InnoDB

    - by schuilr
    Sometime soon we will need to make schema changes to our production database. We need to minimize downtime for this effort, however, the ALTER TABLE statements are going to run for quite a while. Our largest tables have 150 million records, largest table file is 50G. All tables are InnoDB, and it was set up as one big data file (instead of a file-per-table). We're running MySQL 5.0.46 on an 8 core machine, 16G memory and a RAID10 config. I have some experience with MySQL tuning, but this usually focusses on reads or writes from multiple clients. There is lots of info to be found on the Internet on this subject, however, there seems to be very little information available on best practices for (temporarily) tuning your MySQL server to speed up ALTER TABLE on InnoDB tables, or for INSERT INTO .. SELECT FROM (we will probably use this instead of ALTER TABLE to have some more opportunities to speed things up a bit). The schema changes we are planning to do is adding a integer column to all tables and make it the primary key, instead of the current primary key. We need to keep the 'old' column as well so overwriting the existing values is not an option. What would be the ideal settings to get this task done as quick as possible?

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  • Appending facts into an existing prolog file.

    - by vuj
    Hi, I'm having trouble inserting facts into an existing prolog file, without overwriting the original contents. Suppose I have a file test.pl: :- dynamic born/2. born(john,london). born(tim,manchester). If I load this in prolog, and I assert more facts: | ?- assert(born(laura,kent)). yes I'm aware I can save this by doing: |?- tell('test.pl'),listing(born/2),told. Which works but test.pl now only contains the facts, not the ":- dynamic born/2": born(john,london). born(tim,manchester). born(laura,kent). This is problematic because if I reload this file, I won't be able to insert anymore facts into test.pl because ":- dynamic born/2." doesn't exist anymore. I read somewhere that, I could do: append('test.pl'),listing(born/2),told. which should just append to the end of the file, however, I get the following error: ! Existence error in user:append/1 ! procedure user:append/1 does not exist ! goal: user:append('test.pl') Btw, I'm using Sicstus prolog. Does this make a difference? Thanks!

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  • Question concerning SCJP-6 exam

    - by abatishchev
    While preparing for the SCJP-6 exam I faced with a difficult issue. I can’t find answer by myself. Please, answer for the question and give short comments: abstract class A<K> extends Number> { // insert code here } public abstract <K> A<? extends Number> useMe(A<? super K> k); public abstract <K> A<? super Number> useMe(A<? extends K> k); public abstract <K> A<K> useMe(A<K> k); public abstract <V extends K> A<V> useMe(A<V> k); public abstract <V super K> A<V> useMe(A<V> k); public abstract <V extends Character> A<? super V> useMe(A<K> k); public abstract <V super Character> A<? super V> useMe(A<K> k); Which method can be inserted in a placeholder above? P.S. I tried to look on the specification. Those one was not helpful for me.

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  • QuadTrees - how to update when internal items are moving

    - by egarcia
    I've implemented a working QuadTree. It subdivides 2-d space in order to accomodate items, identified by their bounding box (x,y,width,height) on the smallest possible quad (up to a minimum area). My code is based on this implementation (mine is in Lua instead of C#) : http://www.codeproject.com/KB/recipes/QuadTree.aspx I've been able to successfully implement insertions and deletions successfully. I've turn now my attention to the update() function, since my items' position and dimensions change over time. My first implementation works, but it is quite naïve: function QuadTree:update(item) self:remove(item) return self.root:insert(item) end Yup, I basically remove and reinsert every item every time they move. This works, but I'd like to optimize it a bit more; after all, most of the time, moving items still remain on the same quadTree node most of the iterations. Is there any standard way to deal with this kind of update? In case it helps, my code is here: http://github.com/kikito/passion/blob/master/ai/QuadTree.lua I'm not looking for someone to implement it for me; pointers to an existing working implementation (even in other languages) would suffice.

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  • Rails form with a better URL

    - by Sam
    Wow, switching to REST is a different paradigm for sure and is mainly a headache right now. view <% form_tag (businesses_path, :method => "get") do %> <%= select_tag :business_category_id, options_for_select(@business_categories.collect {|bc| [bc.name, bc.id ]}.insert(0, ["All Containers", 0]), which_business_category(@business_category) ), { :onchange => "this.form.submit();"} %> <% end %> controller def index @business_categories = BusinessCategory.find(:all) if params[:business_category_id].to_i != 0 @business_category = BusinessCategory.find(params[:business_category_id]) @businesses = @business_category.businesses else @businesses = Business.all end respond_to do |format| format.html # index.html.erb format.xml { render :xml => @businesses } end end routes map.resources What I want to to is get a better URL than what this form is presenting which is the following: http://localhost:3000/businesses?business_category_id=1 Without REST I would have do something like http://localhost:3000/business/view/bbq bbq as permalink or I would have done http://localhost:300/business_categories/view/bbq and get the business that are associated with the category but I don't really know the best way of doing this. So the two questions are what is the best logic of finding a business by its categories using the latter form and number two how to get that in a pretty URL all through RESTful routes in Rails.

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  • SQL 2008 Querying Soap XML

    - by Vince
    I have been trying to process this SOAP XML return using SQL but all I get is NULL or nothing at all. I have tried different ways and pasted them all below. Declare @xmlMsg xml; Set @xmlMsg = '<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <soap:Body> <SendWarrantyEmailResponse xmlns="http://Web.Services.Warranty/"> <SendWarrantyEmailResult xmlns="http://Web.Services.SendWarrantyResult"> <WarrantyNumber>120405000000015</WarrantyNumber> <Result>Cannot Send Email to anonymous account!</Result> <HasError>true</HasError> <MsgUtcTime>2012-06-07T01:11:36.8665126Z</MsgUtcTime> </SendWarrantyEmailResult> </SendWarrantyEmailResponse> </soap:Body> </soap:Envelope>'; declare @table table (data xml); insert into @table values (@xmlMsg); select data from @table; WITH xmlnamespaces ('http://schemas.xmlsoap.org/soap/envelope/' as [soap], 'http://Web.Services.Warranty' as SendWarrantyEmailResponse, 'http://Web.Services.SendWarrantyResult' as SendWarrantyEmailResult) SELECT Data.value('(/soap:Envelope[1]/soap:Body[1]/SendWarrantyEmailResponse[1]/SendWarrantyEmailResult[1]/WarrantyNumber[1])[1]','VARCHAR(500)') AS WarrantyNumber FROM @Table ; ;with xmlnamespaces('http://schemas.xmlsoap.org/soap/envelope/' as [soap],'http://Web.Services.Warranty' as SendWarrantyEmailResponse,'http://Web.Services.SendWarrantyResult' as SendWarrantyEmailResult) --select @xmlMsg.value('(/soap:Envelope/soap:Body/SendWarrantyEmailResponse/SendWarrantyEmailResult/WarrantyNumber)[0]', 'nvarchar(max)') --select T.N.value('.', 'nvarchar(max)') from @xmlMsg.nodes('/soap:Envelope/soap:Body/SendWarrantyEmailResponse/SendWarrantyEmailResult') as T(N) select @xmlMsg.value('(/soap:Envelope/soap:Body/SendWarrantyEmailResponse/SendWarrantyEmailResult/HasError)[1]','bit') as test ;with xmlnamespaces('http://schemas.xmlsoap.org/soap/envelope/' as [soap],'http://Web.Services.Warranty' as [SendWarrantyEmailResponse],'http://Web.Services.SendWarrantyResult' as [SendWarrantyEmailResult]) SELECT SendWarrantyEmailResult.value('WarrantyNumber[1]','varchar(max)') AS WarrantyNumber, SendWarrantyEmailResult.value('Result[1]','varchar(max)') AS Result, SendWarrantyEmailResult.value('HasError[1]','bit') AS HasError, SendWarrantyEmailResult.value('MsgUtcTime[1]','datetime') AS MsgUtcTime FROM @xmlMsg.nodes('/soap:Envelope/soap:Body/SendWarrantyEmailResponse/SendWarrantyEmailResult') SendWarrantyEmailResults(SendWarrantyEmailResult)

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  • How to migrate primary key generation from "increment" to "hi-lo"?

    - by Bevan
    I'm working with a moderate sized SQL Server 2008 database (around 120 tables, backups are around 4GB compressed) where all the table primary keys are declared as simple int columns. At present, primary key values are generated by NHibernate with the increment identity generator, which has worked well thus far, but precludes moving to a multiprocessing environment. Load on the system is growing, so I'm evaluating the work required to allow the use of multiple servers accessing a common database backend. Transitioning to the hi-lo generator seems to be the best way forward, but I can't find a lot of detail about how such a migration would work. Will NHibernate automatically create rows in the hi-lo table for me, or do I need to script these manually? If NHibernate does insert rows automatically, does it properly take account of existing key values? If NHibernate does take care of thing automatically, that's great. If not, are there any tools to help? Update NHibernate's increment identifier generator works entirely in-memory. It's seeded by selecting the maximum value of used identifiers from the table, but from that point on allocates new values by a simple increment, without reference back to the underlying database table. If any other process adds rows to the table, you end up with primary key collisions. You can run multiple threads within the one process just fine, but you can't run multiple processes. For comparison, the NHibernate identity generator works by configuring the database tables with identity columns, putting control over primary key generation in the hands of the database. This works well, but compromises the unit of work pattern. The hi-lo algorithm sits inbetween these - generation of primary keys is coordinated through the database, allowing for multiprocessing, but actual allocation can occur entirely in memory, avoiding problems with the unit of work pattern.

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  • Find out which row caused the error

    - by Felipe Fiali
    I have a big fat query that's written dynamically to integrate some data. Basically what it does is query some tables, join some other ones, treat some data, and then insert it into a final table. The problem is that there's too much data, and we can't really trust the sources, because there could be some errored or inconsistent data. For example, I've spent almost an hour looking for an error while developing using a customer's database because somewhere in the middle of my big fat query there was an error converting some varchar to datetime. It turned out to be that they had some sales dating '2009-02-29', an out-of-range date. And yes, I know. Why was that stored as varchar? Well, the source database has 3 columns for dates, 'Month', 'Day' and 'Year'. I have no idea why it's like that, but still, it is. But how the hell would I treat that, if the source is not trustable? I can't HANDLE exceptions, I really need that it comes up to another level with the original message, but I wanted to provide some more info, so that the user could at least try to solve it before calling us. So I thought about displaying to the user the row number, or some ID that would at least give him some idea of what record he'd have to correct. That's also a hard job because there will be times when the integration will run up to 80000 records. And in an 80000 records integration, a single dummy error message: 'The conversion of a varchar data type to a datetime data type resulted in an out-of-range datetime value' means nothing at all. So any idea would be appreciated. Oh I'm using SQL Server 2005 with Service Pack 3.

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  • Association and model data saving problem

    - by Zhlobopotam
    Developing with cakephp 1.3 (latest from github). There are 2 models bind with hasAndBelongsToMany: documents and tags. Document can have many tags in other words. I've add a new document submitting form there user can enter a list of tags separated with commas (new tag will be added, if not exist already). I looked at cakephp bakery 2.0 source code on github and found the solution. But it seems that something is wrong. class Document extends AppModel { public $hasAndBelongsToMany = array('Tag'); public function beforeSave($options = array()) { if (isset($this->data[$this->alias]['tags']) && !empty($this- >data[$this->alias]['tags'])) { $tagIds = $this->Tag->saveDocTags($this->data[$this->alias] ['tags']); unset($this->data[$this->alias]['tags']); $this->data[$this->Tag->alias][$this->Tag->alias] = $tagIds; } return true; } } class Tag extends AppModel { public $hasAndBelongsToMany = array ('Document'); public function saveDocTags($commalist = '') { if ($commalist == '') return null; $tags = explode(',',$commalist); if (empty($tags)) return null; $existing = $this->find('all', array( 'conditions' => array('title' => $tags) )); $return = Set::extract($existing,'/Tag/id'); if (sizeof($existing) == sizeof($tags)) { return $return; } $existing = Set::extract($existing,'/Tag/title'); foreach ($tags as $tag) { if (!in_array($tag, $existing)) { $this->create(array('title' => $tag)); $this->save(); $return[] = $this->id; } } return $return; } } So, new tags creation works well but document model can't save association data and tells: SQL Error: 1054: Unknown column 'Array' in 'field list' Query: INSERT INTO documents (title, content, shortnfo, date, status) VALUES ('Document with tags', '', '', Array, 1) Any ideas how to solve this problem?

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