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  • Handling close-to-impossible collisions on should-be-unique values

    - by balpha
    There are many systems that depend on the uniqueness of some particular value. Anything that uses GUIDs comes to mind (eg. the Windows registry or other databases), but also things that create a hash from an object to identify it and thus need this hash to be unique. A hash table usually doesn't mind if two objects have the same hash because the hashing is just used to break down the objects into categories, so that on lookup, not all objects in the table, but only those objects in the same category (bucket) have to be compared for identity to the searched object. Other implementations however (seem to) depend on the uniqueness. My example (that's what lead me to asking this) is Mercurial's revision IDs. An entry on the Mercurial mailing list correctly states The odds of the changeset hash colliding by accident in your first billion commits is basically zero. But we will notice if it happens. And you'll get to be famous as the guy who broke SHA1 by accident. But even the tiniest probability doesn't mean impossible. Now, I don't want an explanation of why it's totally okay to rely on the uniqueness (this has been discussed here for example). This is very clear to me. Rather, I'd like to know (maybe by means of examples from your own work): Are there any best practices as to covering these improbable cases anyway? Should they be ignored, because it's more likely that particularly strong solar winds lead to faulty hard disk reads? Should they at least be tested for, if only to fail with a "I give up, you have done the impossible" message to the user? Or should even these cases get handled gracefully? For me, especially the following are interesting, although they are somewhat touchy-feely: If you don't handle these cases, what do you do against gut feelings that don't listen to probabilities? If you do handle them, how do you justify this work (to yourself and others), considering there are more probable cases you don't handle, like a supernonva?

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  • JSF - Updating Model Values in Controller Bean

    - by Sean
    I have a Controller bean (SearchController) that has two managed bean as managed properties (SearchCriteria, SearchResults; both of which are session scoped). When the user hits the find button, the action method that is executed is in SearchController. The SearchCreteria managed bean has a method called search(). This method returns a new SearchResults object. In the controller bean, I am setting the searchResults managed property to be this new SearchResults object. The searchResults object contains what I expect during that request, but the object does not persist in the managed bean. I understand that I am changing what object that searchResults is referencing, but what I don't understand is why JSF isn't updating the model to use the new object. Any ideas what I'm missing or don't understand? I am using JSF 1.1 on WebSphere 6.1. If I put the search method in the SearchResults managed bean, it works.

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  • SQL: How to order values inside group by

    - by Denis Yaremov
    Consider the following MS SQL Server table: ID | X | Y ------+-------+------- 1 | 1 | 1 2 | 1 | 2 3 | 1 | 3 4 | 2 | 40 5 | 2 | 500 6 | 3 | 1 7 | 3 | 100 8 | 3 | 10 I need to select the ID of the row that has the maximum value of Y grouped by x, i.e: ID | X | Y ------+-------+------- 3 | 1 | 3 5 | 2 | 500 7 | 3 | 100 The query will be nested several times so an optimal performance solution is required... Thank you!

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  • remove a varchar2 string from the middle of table data values

    - by Michelle Daniel
    Data in the file_name field of the generation table should be an assigned number, then _01, _02, or _03, etc. and then .ldf (example 82617_01.pdf). Somewhere, the program is putting a state name and sometimes a date/time stamp, between the assigned number and the 01, 02, etc. (82617_ALABAMA_01.pdf or 19998_MAINE_07-31-2010_11-05-59_AM.pdf or 5485325_OREGON_01.pdf for example). We would like to develop an SQL statement to find the bad file names and fix them. In theory it seems rather simple to find file_names that include a varchar2 data type and remove it, but putting the statement together is beyond me. Any help or suggestions apprecuiated. Something like ........... UPDATE GENERATION SET FILE_NAME (?) WHERE FILE_NAME (?...LIKE '%STRING%');?

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  • Store multiple values in a session variable

    - by user458790
    Hi, Before I ask my doubt, please consider this scenario that a user on my website have a profileID. With this profileID are associated some pluginID's. For eg: User1 might have 2, 3 and 5 plugins associated with its profile. When the user logs in, I store the profileID of the user in a session variable cod. At a certain page, the user tries to edit the plugins associated with his profile. So, on that page, I have retrieve those pluginID's from the DB. I have applied this code but this fetches only the maximum pluginID from the DB and not all the pluginID's. SqlCommand cmd1 = new SqlCommand("select plugin_id from profiles_plugins where id=(select id from profiles_plugins where profile_id=" + Convert.ToInt32(Session["cod"]) + ")", con); SqlDataReader dr1 = cmd1.ExecuteReader(); if (dr1.HasRows) { while (dr1.Read()) { Session["edp1"] = Convert.ToInt32(dr1[0]); } } dr1.Close(); cmd1.Dispose(); I was trying to figure out how can I store multiple pluginID's in this session variable? Thanks

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  • Get a DB result with a value between two columns values

    - by vitto
    Hi, I have a database situation where I'd like to get a user profile row by a user age range. this is my db: table_users username age email url pippo 15 [email protected] http://example.com pluto 33 [email protected] http://example.com mikey 78 [email protected] http://example.com table_profiles p_name start_age_range stop_age_range young 10 29 adult 30 69 old 70 inf I use MySQL and PHP but I don't know if there is some specific tacnique to do this and of course if it's possible. # so something like: SELECT * FROM table_profiles AS profiles INNER JOIN table_users AS users # can I do something like this? ON users.age IS BETWEEN profiles.start_age_range AND profiles.stop_age_range

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  • VBScript: how to set values from recordset to string

    - by phill
    This is probably a beginner question, but how do you set a recordset to a string variable? Here is my code: Function getOffice (strname, uname) strEmail = uname WScript.Echo "email: " & strEmail Dim objRoot : Set objRoot = GetObject("LDAP://RootDSE") Dim objDomain : Set objDomain = GetObject("LDAP://" & objRoot.Get("defaultNamingContext")) Dim cn : Set cn = CreateObject("ADODB.Connection") Dim cmd : Set cmd = CreateObject("ADODB.Command") cn.Provider = "ADsDSOObject" cn.Open "Active Directory Provider" Set cmd.ActiveConnection = cn cmd.CommandText = "SELECT physicalDeliveryOfficeName FROM '" & objDomain.ADsPath & "' WHERE mail='" & strEmail & "'" cmd.Properties("Page Size") = 1 cmd.Properties("Timeout") = 300 cmd.Properties("Searchscope") = ADS_SCOPE_SUBTREE Dim objRS : Set objRS = cmd.Execute WScript.Echo objRS.Fields(0) Set cmd = Nothing Set cn = Nothing Set objDomain = Nothing Set objRoot = Nothing Dim arStore Set getOffice = objRS.Fields(0) Set objRS = Nothing End function When I try to run the function, it throws an error "vbscript runtime error: Type mismatch" I presume this means it can't set the string variable with a recordset value. How do I fix this problem?

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  • richfaces suggestionBox passing additional values to backing bean

    - by Martlark
    When using the rich faces suggestionBox how can you pass more than one id or value from the page with the text input to the suggestionBox backing bean. ie: to show a list of suggested cities within a selected state? Here is my autoComplete method. public List< Suburb > autocomplete(Object suggest) { String pref = (String) suggest; ArrayList< Suburb > result = new ArrayList< Suburb >(); Iterator< Suburb > iterator = getSuburbs().iterator(); while( iterator.hasNext() ) { Suburb elem = ((Suburb) iterator.next()); if( (elem.getName() != null && elem.getName().toLowerCase().indexOf( pref.toLowerCase() ) == 0) || "".equals( pref ) ) { result.add( elem ); } } return result; } As you can see there is one value passed from the page, Object suggest, which is the text of the h:inputText (in the faceLets m:textFormRow ) <m:textFormRow id="suburb" label="#{msgs.suburbPrompt}" property="#{bean[dto].addressDTO.suburb}" required="true" maxlength="100" size="30" /> <rich:suggestionbox height="200" width="200" usingSuggestObjects="true" suggestionAction="#{suburbsMBean.autocomplete}" var="suburb" for="suburb" fetchValue="#{suburb.name}" id="suggestion"> <h:column> <h:outputText value="#{suburb.name}" /> </h:column> </rich:suggestionbox> Earlier in the page you can select a state which I'd like to use to pare down the list of suburbs that the suggestion box displays.

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  • How to Avoid Server Error 414 for Very Long QueryString Values

    - by Registered User
    I had a project that required posting a 2.5 million character QueryString to a web page. The server itself only parsed URI's that were 5,400 characters or less. After trying several different sets of code for WebRequest/WebResponse, WebClient, and Sockets, I finally found the following code that solved my problem: HttpWebRequest webReq; HttpWebResponse webResp = null; string Response = ""; Stream reqStream = null; webReq = (HttpWebRequest)WebRequest.Create(strURL); Byte[] bytes = Encoding.UTF8.GetBytes("xml_doc=" + HttpUtility.UrlEncode(strQueryString)); webReq.ContentType = "application/x-www-form-urlencoded"; webReq.Method = "POST"; webReq.ContentLength = bytes.Length; reqStream = webReq.GetRequestStream(); reqStream.Write(bytes, 0, bytes.Length); reqStream.Close(); webResp = (HttpWebResponse)webReq.GetResponse(); if (webResp.StatusCode == HttpStatusCode.OK) { StreamReader loResponseStream = new StreamReader(webResp.GetResponseStream(), Encoding.UTF8); Response = loResponseStream.ReadToEnd(); } webResp.Close(); reqStream = null; webResp = null; webReq = null;

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  • Retrive multiple values from single dimension value / key JSON

    - by jonnypixel
    I'm busting my head trying to work this out. "ContentBlock1":["2","22"] I have been trying to get the 2 and the 22 into a comma sepertaed string so i can use it within a MySQL IN(2,22) query. I currently have tried several ways but none seem to work for me. $ContentBlock = my json data; $cid = json_decode($ContentBlock,true); foreach ($cid as $key){ $jsoncid = "$key ,"; } And then: SELECT * FROM content WHERE featured=1 AND state=1 AND catid IN($jsoncid) ORDER BY ordering ASC LIMIT 4");

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  • jQuery selectable() elements update values

    - by Josh
    Basically what I'm trying to do is update the value attribute of a hidden input field contained within the selected element when the selectable() UI stops running. If the element is selected, then the input's value should be the name attribute of that particular LI, whereas if the element is not selected, the value should be updated as empty. HTML Sample: <ul id="selector"> <li class="networkicon shr-digg" name="shr-digg"> <div></div> <label>Digg</label> <input type="hidden" value="" name="bookmark[]" /> </li> <li class="networkicon shr-reddit" name="shr-reddit"> <div></div> <label>Reddit</label> <input type="hidden" value="" name="bookmark[]" /> </li> <li class="networkicon shr-newsvine" name="shr-newsvine"> <div></div> <label>Newsvine</label> <input type="hidden" value="" name="bookmark[]" /> </li> </ul> Script Sample: $(function() { $("#selector").selectable({ filter: 'li', selected: function(event, ui) { $(".ui-selected").each(obj, function() { $(this).children('input').val($(this).attr('name')); }); }, unselected: function(event, ui) { $(".ui-selected").each(obj, function() { $(this).children('input').val(''); }); } }); });

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  • Can CFHEADER values be read by other code?

    - by Aidan Whitehall
    The code <cfheader name="Test" value="1"> <cfheader name="Test" value="2"> results in the header "Test: 2" being sent to the browser (as seen using HttpFox). Is there a way for the second line of code to determine if a header with the same name has already been written using CFHEADER? Thanks!

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  • Improved way to build nested array of unique values in javascript

    - by dualmon
    The setup: I have a nested html table structure that displays hierarchical data, and the individual rows can be hidden or shown by the user. Each row has a dom id that is comprised of the level number plus the primary key for the record type on that level. I have to have both, because each level is from a different database table, so the primary key alone is not unique in the dom. example: id="level-1-row-216" I am storing the levels and rows of the visible elements in a cookie, so that when the page reloads the same rows the user had open are can be shown automatically. I don't store the full map of dom ids, because I'm concerned about it getting too verbose, and I want to keep my cookie under 4Kb. So I convert the dom ids to a compact json object like this, with one property for each level, and a unique array of primary keys under each level: { 1:[231,432,7656], 2:[234,121], 3:[234,2], 4:[222,423], 5:[222] } With this structure stored in a cookie, I feed it to my show function and restore the user's previous disclosure state when the page loads. The area for improvement: I'm looking for better option for reducing my map of id selectors down to this compact format. Here is my function: function getVisibleIds(){ // example dom id: level-1-row-216-sub var ids = $("tr#[id^=level]:visible").map(function() { return this.id; }); var levels = {}; for(var i in ids ) { var id = ids[i]; if (typeof id == 'string'){ if (id.match(/^level/)){ // here we extract the number for level and row var level = id.replace(/.*(level-)(\d*)(.*)/, '$2'); var row = id.replace(/.*(row-)(\d*)(.*)/, '$2'); // *** Improvement here? *** // This works, but it seems klugy. In PHP it's one line (see below): if(levels.hasOwnProperty(level)){ if($.inArray(parseInt(row, 10) ,levels[level]) == -1){ levels[level].push(parseInt(row, 10)); } } else { levels[level] = [parseInt(row, 10)]; } } } } return levels; } If I were doing it in PHP, I'd build the compact array like this, but I can't figure it out in javascript: foreach($ids as $id) { if (/* the criteria */){ $level = /* extract it from $id */; $row = /* extract it from $id */; $levels[$level][$row]; } }

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  • replacing values in formated file with python

    - by froggy
    I have a string see attached file like that and i would like to modify it using a function Giving section name parameter name and value to set Also in case i want to modify several parameters for a same section how can i have position in file to avoid scanning x time for a same section and other to pass my question and other to pass my question and other to pass my question and other to pass my question and other to pass my question and other to pass my question and other to pass my question and other to pass my question and other to pass my question and other to pass my question and other to pass my question an and other to pass my question d other to pass my question and other to pass my question and other to pass my question and other to pass my questionand other to pass my question and other to pass my question

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  • Extracting a given number of the highest values in a List

    - by James P.
    I'm seeking to display a fixed number of items on a web page according to their respective weight (represented by an Integer). The List where these items are found can be of virtually any size. The first solution that comes to mind is to do a Collections.sort() and to get the items one by one by going through the List. Is there a more elegant solution though that could be used to prepare, say, the top eight items?

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  • Are all css font-weight property's values useful?

    - by jitendra
    font-weight:normal font-weight:bold font-weight:bolder font-weight:lighter font-weight:100 font-weight:200 font-weight:300 font-weight:400 font-weight:500 font-weight:600 font-weight:700 font-weight:800 font-weight:900 I've only used font-weight:bold and sometime font-weight:normal to override bold so far? What are usages of others?

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  • binding image with 2 values with convertor

    - by prince23
    hi, is it possiable to set 2 data field for an image control whiling binding **<Image Source="{Binding ItemID, Converter={StaticResource IDToImageConverter}}" Height="50" />** now here i need to add one more value Price now. need to send even price as an paramter for IDToImageConverter function how can i do it? now i need to check first price value there are 3 condition i neeed to check in my IDToImageConverter function if( price> 5o) { // then get the ItemID based on the value bind image here if(ItemID >20) { // bind image1 } if(ItemID >50) { // bind image2 } } if( price> 100) { // as above codition we do here } now how can i add these above functionality in IDToImageConverter ? any idea how i can solve it <Image Source="{Binding ItemID, Converter={StaticResource IDToImageConverter}}" Height="50" /> </DataTemplate> </data:DataGridTemplateColumn.CellTemplate> </data:DataGridTemplateColumn> </data:DataGrid.Columns> </data:DataGrid> public class IDToImageConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { Uri uri = new Uri("~/Images/" + value.ToString()+ ".jpg", UriKind.Relative); return new BitmapImage(uri); } thanks in advance. for anyhelp you provide prince

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  • Database normalization and duplicate values

    - by bretddog
    Consider a Parent / Child / GrandChild structure in a database table schema, or even a deeper hierarchy. These being in the same aggregate. One table DAYS keeps a single row per day, and has a "Date" field. This is the root table, or maybe a child of the root. No row can ever be deleted in this table. In this case, however complex my table schema looks like, however far away in the hierarchy any other table is, is there any reason why any other table would hold a Date value? Can't it instead just have a FK to the DAYS table. I obviously assume that the creation of these date fields happen not before such datefield exist in the DAYS table. I'm now thinking just about the date part to be relevant, not the time part. Not sure if all databases can store these individually. That's maybe relevant, but not really the focus of the question.

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  • Comparing 2 tables column values and copying the next column content to the second table

    - by Sullan
    Hi All.. I am comparing between two tables first column each. If there is find a match i am copying the text from the adjacent cell of the first table to the second table. I am able to compare strings and get the value, but finding it difficult to print it in the second table. I am getting the value in the var "replaceText", but how to print it in the second table ?? Please help... Sample code is as follows.. <script type="text/javascript"> jQuery.noConflict(); jQuery(document).ready(function(){ jQuery('.itemname').each(function(){ var itemName = jQuery(this).text(); jQuery('.comparerow').each(function() { var compareRow = jQuery(this).text(); if (itemName == compareRow) { var replaceText = jQuery(this).next('td').text(); alert(replaceText); } }); }); }); </script> HTML is as follows <table width="100%"><thead> <tr> <th align="left" >Name</th><th>Description</th></tr></thead> <tbody> <tr> <td class="comparerow">IX0001</td> <td class="desc">Desc 1 </td> </tr> <tr> <td class="comparerow">IX0002</td> <td class="desc" >Desc 2 </td> </tr> <tr> <td class="comparerow">IX0003</td> <td class="desc">Desc 3 </td> </tr> <tr> <td class="comparerow">IX0004</td> <td class="desc">Desc 4 </td> </tr> </tbody> </table> <br /> <table width="100%"> <tr> <th>Name</th><th>Description</th> </tr> <tr > <td class="itemname">IX0001</td><td></td> </tr> <tr> <td class="itemname">IX0002</td><td></td> </tr> <tr> <td class="itemname">IX0003</td><td></td> </tr> </table>

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  • Splitting a string which contain multiple symbols to get specific values

    - by Eon Rusted du Plessis
    I cannot believe I am having trouble with this following string String filter = "name=Default;pattern=%%;start=Last;end=Now"; This is a short and possibly duplicate question, but how would I split this string to get: string Name = "Default"; string Pattern = "%%" ; string start = "Last" ; string end = "Now" ; Reason why I ask is my deadline is very soon, and this is literally the last thing I must do. I'm Panicking, and I'm stuck on this basic command. I tried: pattern = filter.Split(new string[] { "pattern=", ";" }, StringSplitOptions.RemoveEmptyEntries)[1]; //Gets the pattern startDate = filter.Split(new string[] { "start=", ";" }, StringSplitOptions.RemoveEmptyEntries)[1]; //Gets the start date I happen to get the pattern which I needed, but as soon as I try to split start, I get the value as "Pattern=%%" What can I do? Forgot to mention The list in this string which needs splitting may not be in any particular order . this is a single sample of a string which will be read out of a stringCollection (reading these filters from Properties.Settings.Filters

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  • tsql sum data and include default values for missing data

    - by markpirvine
    Hi, I would like a query that will shouw a sum of columns with a default value for missing data. For example assume I have a table as follows: type_lookup: id name 1 self 2 manager 3 peer And a table as follows data: id type_lookup_id value 1 1 1 2 1 4 3 2 9 4 2 1 5 2 9 6 1 5 7 2 6 8 1 2 9 1 1 After running a query I would like a result set as follows: type_lookup_id value 1 13 2 25 3 0 I would like all rows in type_lookup table to be included in the result set - even if they don't appear in the data table. Any help would be greatly appreciated, Mark

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  • Default values for Content Taxonomy fields in Drupal

    - by lazysoundsystem
    I'm trying to set the default value for a Content Taxonomy field in a hook_form_alter, but can't pin down the necessary format. I've tried this and many variations: foreach (element_children($form) as $child) { // Set $default_value. if ($form[$child]['tids']) { // This, for Content Taxonomy fields, isn't working: $form[$child]['tids']['#default_value'] = array('value' => $default_value); dsm($form[$child]['tids']['#default_value']); } else { // This, for other fields, is working: $form[$child][0]['#default_value']['value'] = $default_value; } } Can anyone tell me what I'm missing?

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