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  • .Net 4.0 Memory-Mapped Files verses RDMS Storage

    - by Harry
    I'm interested in people's thoughts comparing storing data in a traditional SQL based Database or utilising a Memory-Mapped File such as the one in the new .Net 4.0 runtime. The data in question would be arrays of simple structures. Obvious pros and cons: SQL Database Pros Adhoc query support SQL Management Tools Schema changes (adding more columns and setting default values) Memory-Mapped Pros Lighter overhead? (this is an assumption on my part) Shareable between process threads Any others? Is it worth it for performance gains?

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  • Memory Allocation Error in MySQL

    - by Chinjoo
    I am using MySql ODBC driver with .Net 3.5. I have created a stored procedure in MySQl which accepts around 15 parameters with types like datetime, varchar, Int32, Int64 etc.. When I run the SP from the query window with the arguments provided, it runs fine. But whwn I test using the .Net application, it gives exception with "Memory allocation error", MySQL native error code is 4001. Any help will be much appreciated.

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  • Where to put the application ID in YQL

    - by earlyriser
    I'm trying to read an xml response from YQL: $url = 'http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20geo.places%20where%20woeid%3D%22'.$woeid.'%22'; if (!$xml=simplexml_load_file($url) ) { //DO STUFF } This code works. Now i'm trying to put my application ID in the url string but I don't know how it should be done. Thanks.

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  • How to display multiple images?

    - by misterwebz
    I'm trying to get multiple image paths from my database in order to display them, but it currently doesn't work. Here's what i'm using: def get_image(self, userid, id): image = meta.Session.query(Image).filter_by(userid=userid) permanent_file = open(image[id].image_path, 'rb') if not os.path.exists(image.image_path): return 'No such file' data = permanent_file.read() permanent_file.close() response.content_type = guess_type(image.image_path)[0] or 'text/plain' return data I'm getting an error regarding this part: image[id].image_path What i want is for Pylons to display several jpg files on 1 page. Any idea how i could achieve this?

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  • How to sanitize sql fragment in Rails

    - by dimus
    I have to sanitize a part of sql query. I can do something like this: class << ActiveRecord::Base public :sanitize_sql end str = ActiveRecord::Base.sanitize_sql(["AND column1 = ?", "two's"], '') But it is not safe because I expose protected method. What is a better way to do it?

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  • SharePoint Add New Item Button on Home Page

    - by ifunky
    I'm building a bulletin board site (in 2010) and I'm sure this must be simple but again it doesn't seem so. Anyway on my default page I have a query webpart showing the latest items and what I need is just a button at the top of the page "Add new item" which would show the popup and allow users to complete the form just like it works on the display list items form. I've looked at AllItems.aspx but can't even see the "Add new item" button to copy! Any ideas? Thanks Dan

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  • row operation in same table and same coloumns

    - by Raj
    Hi! i have a little problem to discuss i hope it will easy for you. suppose i have table A with 2 columns as item price milk 25 milk 50 milk 100 Butter 25 Butter 100 Butter 200 now i want to display a table B derived from table A as item price growth rate milk 0 milk 100 milk 100 Butter 100 Butter 200 Butter 100 formula for growth rate for row1 is ((row[1]-row[0])/row[0])*100 eg for 1st row ((50-25)/25)*100 can you suggest a SQl Query for it

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  • MySql Join using 4 tables

    - by Ionut Flavius Pogacian
    I have 4 tables and i want to join them and extarct 4 values. I wrote the followig MySql Query, but it does not work. select `a`.`id`,`a`.`page` xpage,`a`.`action`, `b`.`header` xheader, `b`.`page_id`, `c`.`content` xcontent,`b`.`page_id`, `d`.`footer` xfooter,`d`.`page_id` join `header` b on `a`.`id`=`b`.`page_id` join `content` c on `a`.`id`=`c`.`page_id` and `a`.`id`=`d`.`page_id` join `footer` d on `a`.`id`=`d`.`page_id` where `a`.`page`='main'

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  • Grouping Records with the same value

    - by Ben
    I am trying to create a conversations based messaging system. I want to group all messages that have the same conversation_id so that when I display a list of current conversations you only see the latest message from each conversation. Can I group the values in the mysql query, or would I have to do it in the php?

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  • GROUP BY a date, with ordering by date.

    - by standard
    Take this simple query: SELECT DATE_FORMAT(someDate, '%y-%m-%d') as formattedDay FROM someTable GROUP BY formatterDay This will select rows from a table with only 1 row per date. How do I ensure that the row selected per date is the earliest for that date, without doing an ordered subquery in the FROM? Cheers

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  • How do I get javascript-generated image maps to work with internet explorer?

    - by schwerwolf
    I'm using javascript to generate a high resolution grid for an image that I generated on a web server. The high-resolution grid is composed of a 'map' element with hundreds of 'area' child elements. Each 'area' element has onmouseover attribute that causes the display of a popup box. After assigning the map to the img (via the usemap attribute), Internet explorer ignores the 'onmouseover' attribute of the area elements that I added via javascript. The behavior is not caused by syntactical variations between IE and other browsers. A static map behaves correctly. Only the elements that I add dynamically to an existing image map fail to fire their corresponding mouse-over events. How can I get IE to fire the mouse-over event for the added 'area' elements? function generate_image_map ( img ) { var tile_width = 8; var tile_height = 10; var plotarea_left = 40; var plotarea_top = 45; var column_count = 100; var row_count = 120; var img_id = YAHOO.util.Dom.getAttribute(img, "id"); var img_map_id = YAHOO.util.Dom.getAttribute(img, "usemap"); var original_map = YAHOO.util.Selector.query(img_map_id)[0]; var area_nodes = YAHOO.util.Selector.query("area", original_map); var last_node = area_nodes[area_nodes.length - 1]; for (var y = 0; y < row_count; y++) { var top = Math.round(plotarea_top + (y * tile_height)); var bottom = Math.round(plotarea_top + (y * tile_height) + tile_height); for (var x = 0; x < column_count; x++) { var left = Math.round(plotarea_left + (x * tile_width)); var right = Math.round(plotarea_left + (x * tile_width) + tile_width); var area = document.createElement("area"); YAHOO.util.Dom.setAttribute(area, "shape", "rect"); YAHOO.util.Dom.setAttribute(area, "onmouseover", "alert('This does not appear in IE')" ); var coords = [ left, top, right, bottom ]; YAHOO.util.Dom.setAttribute(area, "coords", coords.join(",")); YAHOO.util.Dom.insertBefore(area, last_node); } } }

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  • android error NoSuchElementException

    - by Alexander
    I have returned a cursor string but it contains a delimiter. The delimiter is . I have the string quest.setText(String.valueOf(c.getString(1)));I want to turn the into a new line. What is the best method to achieve this task in android. I understand there is a way to get the delimeter. I want this to achieved for each record. I can itterate through record like so. Cursor c = db.getContact(2); I tried using a string tokenizer but it doesnt seem to work. Here is the code for the tokenizer. I tested it in just plain java and it works without errors. String question = c.getString(1); // quest.setText(String.valueOf(c.getString(1))); //quest.setText(String.valueOf(question)); StringTokenizer st = new StringTokenizer(question,"<ENTER>"); //DisplayContact(c); // StringTokenizer st = new StringTokenizer(question, "=<ENTER>"); while(st.hasMoreTokens()) { String key = st.nextToken(); String val = st.nextToken(); System.out.println(key + "\n" + val); } I then tried running it in android. Here is the error log 06-06 22:31:55.251: E/AndroidRuntime(537): FATAL EXCEPTION: main 06-06 22:31:55.251: E/AndroidRuntime(537): java.util.NoSuchElementException 06-06 22:31:55.251: E/AndroidRuntime(537): at java.util.StringTokenizer.nextToken(StringTokenizer.java:208) 06-06 22:31:55.251: E/AndroidRuntime(537): at alex.android.test.database.quiz.TestdatabasequizActivity$1.onClick(TestdatabasequizActivity.java:95) 06-06 22:31:55.251: E/AndroidRuntime(537): at android.view.View.performClick(View.java:3511) 06-06 22:31:55.251: E/AndroidRuntime(537): at android.view.View$PerformClick.run(View.java:14105) 06-06 22:31:55.251: E/AndroidRuntime(537): at android.os.Handler.handleCallback(Handler.java:605) 06-06 22:31:55.251: E/AndroidRuntime(537): at android.os.Handler.dispatchMessage(Handler.java:92) 06-06 22:31:55.251: E/AndroidRuntime(537): at android.os.Looper.loop(Looper.java:137) 06-06 22:31:55.251: E/AndroidRuntime(537): at android.app.ActivityThread.main(ActivityThread.java:4424) 06-06 22:31:55.251: E/AndroidRuntime(537): at java.lang.reflect.Method.invokeNative(Native Method) 06-06 22:31:55.251: E/AndroidRuntime(537): at java.lang.reflect.Method.invoke(Method.java:511) 06-06 22:31:55.251: E/AndroidRuntime(537): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 06-06 22:31:55.251: E/AndroidRuntime(537): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 06-06 22:31:55.251: E/AndroidRuntime(537): at dalvik.system.NativeStart.main(Native Method) This is the database query public Cursor getContact(long rowId) throws SQLException { Cursor mCursor = db.query(true, DATABASE_TABLE, new String[] {KEY_ROWID, question, possibleAnsOne,possibleAnsTwo, possibleAnsThree,realQuestion,UR}, KEY_ROWID + "=" + rowId, null, null, null, null, null); if (mCursor != null) { mCursor.moveToFirst(); }

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  • SQL AND operator not working properly

    - by Chandana De Silva
    I have following two tables LandParcels Table Blockid ParcelNo storPri ======= ======== ======= 52000105 3 State 52000105 4 Private 52000105 5 State Actions Table Blockid ParcelNo ActionTaken ======= ======== =========== 52000105 3 Received 52000105 3 Send to Computer 52000105 4 Received 52000105 5 Received I want to find the records Received but not Send to Computer Here is my query select l.blockid, l.parcelno from landparcels l left join actions ac on l.blockid = ac.blockid and l.parcelno = ac.parcelno where ac.actiontaken = 'Received' and ac.actiontaken <> 'Send to Computer' and ac.blockid = 52000105 The result is Blockid ParcelNo ======= ======== 52000105 3 52000105 4 52000105 5 I want ParcelNo 4 and 5

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  • Recommended way to perform Lucene search without limit

    - by Thomas
    The Lucene documents tell me that "Hits" will be removed from the API in Lucene 3.0. Deprecated. Hits will be removed in Lucene 3.0. Use search(Query, Filter, int) instead. The proposed overload limits the number of documents returned to the value of the int. So my question is: what is the recommended way to perform a search in Lucene with no limit on the number of documents to be returned?

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  • SQL Count in View as column

    - by alex
    I'm trying to get the result of a COUNT as a column in my view. Please see the below query for a demo of the kind of thing I want (this is just for demo purposes) SELECT ProductID, Name, Description, Price, (SELECT COUNT(*) FROM ord WHERE ord.ProductID = prod.ProductID) AS TotalNumberOfOrders FROM tblProducts prod LEFT JOIN tblOrders ord ON prod.ProductID = ord.ProductID This obviously isn't working... but I was wondering what the correct way of doing this would be?

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  • SQL CASE Question

    - by docsql
    Hiya, I dont know if this can be done but i'd though i'd ask. What I want to do is have a case statement query and if a 1 begin another action. if 0 dont do anything. For Example select CASE WHEN client.deathofdeath = yes THEN 1 do another select in here (which is another table) Else 0 End AS DeathDate From Client client Can this be done?

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  • Mysql select - improve performances

    - by realshadow
    Hey, I am working on an e-shop which sells products only via loans. I display 10 products per page in any category, each product has 3 different price tags - 3 different loan types. Everything went pretty well during testing time, query execution time was perfect, but today when transfered the changes to the production server, the site "collapsed" in about 2 minutes. The query that is used to select loan types sometimes hangs for ~10 seconds and it happens frequently and thus it cant keep up and its hella slow. The table that is used to store the data has approximately 2 milion records and each select looks like this: SELECT * FROM products_loans WHERE KOD IN("X17/Q30-10", "X17/12", "X17/5-24") AND 369.27 BETWEEN CENA_OD AND CENA_DO; 3 loan types and the price that needs to be in range between CENA_OD and CENA_DO, thus 3 rows are returned. But since I need to display 10 products per page, I need to run it trough a modified select using OR, since I didnt find any other solution to this. I have asked about it here, but got no answer. As mentioned in the referencing post, this has to be done separately since there is no column that could be used in a join (except of course price and code, but that ended very, very badly). Here is the show create table, kod and CENA_OD/CENA_DO very indexed via INDEX. CREATE TABLE `products_loans` ( `KOEF_ID` bigint(20) NOT NULL, `KOD` varchar(30) NOT NULL, `AKONTACIA` int(11) NOT NULL, `POCET_SPLATOK` int(11) NOT NULL, `koeficient` decimal(10,2) NOT NULL default '0.00', `CENA_OD` decimal(10,2) default NULL, `CENA_DO` decimal(10,2) default NULL, `PREDAJNA_CENA` decimal(10,2) default NULL, `AKONTACIA_SUMA` decimal(10,2) default NULL, `TYP_VYHODY` varchar(4) default NULL, `stage` smallint(6) NOT NULL default '1', PRIMARY KEY (`KOEF_ID`), KEY `CENA_OD` (`CENA_OD`), KEY `CENA_DO` (`CENA_DO`), KEY `KOD` (`KOD`), KEY `stage` (`stage`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 And also selecting all loan types and later filtering them trough php doesnt work good, since each type has over 50k records and the select takes too much time as well... Any ides about improving the speed are appreciated. Edit: Here is the explain +----+-------------+----------------+-------+---------------------+------+---------+------+--------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+----------------+-------+---------------------+------+---------+------+--------+-------------+ | 1 | SIMPLE | products_loans | range | CENA_OD,CENA_DO,KOD | KOD | 92 | NULL | 190158 | Using where | +----+-------------+----------------+-------+---------------------+------+---------+------+--------+-------------+ I have tried the combined index and it improved the performance on the test server from 0.44 sec to 0.06 sec, I cant access the production server from home though, so I will have to try it tomorrow.

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  • SQL: Recursive Path

    - by Chris
    Is it possible to create a "tree resolver" in SQL? I have a table: ID Name Parent 1 a 2 b 1 3 c 1 4 d 3 Now I want a SQL query that returns: ID PATH 1 /a 2 /a/b 3 /a/c 4 /a/c/d Is this possible with SQL? It would make many things easier for me. Any help would really be appreciated!

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