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• SQL Server Compact timed out waiting for a lock

  - by jankhana

  Hi all, I'm having an application in that i use Sql Compact 3.5 with VS2008. I'm running multiple threads in my application which contacts the compact database and accesses the row. It selects and deletes those rows in a fashion i.e selecting and giving to the application 5 rows and deleting those rows from the table. It works great with a single thread but if i use multiple threads i.e if 3 or more threads are running I get very often the TimeOut Error!!! I have increased the Time out property in the connection string but it didn't give me expected result. The error log is as follow: SQL Server Compact timed out waiting for a lock. The default lock time is 2000ms for devices and 5000ms for desktops. The default lock timeout can be increased in the connection string using the ssce: default lock timeout property. [ Session id = 5,Thread id = 4204,Process id = 4808,Table name = XXX,Conflict type = x lock (s blocks),Resource = TAB ] The Query that I use to retrieve is as follows: " select Top(5) * from TableName order by id; delete from TableName where id in(select top(5) id from TableName order by id); " Is there any way by which we can avoid this Time Out exception??????? The above query I un as a transaction in VS2008 one using SQLCECommand and the other using SqlCEDataAdapter. Any Idea!!!!!! Reply

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• Mapping two tables 0..n in Hibernate

  - by simon

  I have a table Users CREATE TABLE "USERS" ( "ID" NUMBER NOT NULL , "LOGINNAME" VARCHAR2 (150) NOT NULL ) and I have a second table SpecialUsers. No UserId can occur twice in the SpecialUsers table, and only a small subset of the ids of users in the Users table are contained in the SpecialUsers table. CREATE TABLE "SPECIALUSERS" ( "USERID" NUMBER NOT NULL, CONSTRAINT "PK_SPECIALUSERS" PRIMARY KEY ("USERID") ) ALTER TABLE "SPECIALUSERS" ADD CONSTRAINT "FK_SPECIALUSERS_USERID" FOREIGN KEY ("USERID") REFERENCES "USERS" ("ID") / Mapping the Users table in Hibernate works ok <hibernate-mapping package="com.initech.domain"> <class name="com.initech.User" table="USERS"> <id name="id" column="ID" type="java.lang.Long"> <meta attribute="use-in-tostring">true</meta> <generator class="sequence"> <param name="sequence">SEQ_USERS_ID</param> </generator> </id> <property name="loginName" column="LOGINNAME" type="java.lang.String" not-null="true"> <meta attribute="use-in-tostring">true</meta> </property> </class> </hibernate-mapping> But I'm struggling in creating the mapping for the SpecialUsers table. All the examples (e.g. in Hibernate documentation) in Internet I found don't have this type of self-reference. I tried a mapping like this: <hibernate-mapping package="com.initech.domain"> <class name="com.initech.User" table="SPECIALUSERS"> <id name="id" column="USERID"> <meta attribute="use-in-tostring">true</meta> <generator class="foreign"> <param name="property">user</param> </generator> </id> <one-to-one name="user" class="User"/> </class> </hibernate-mapping> but got the error Invocation of init method failed; nested exception is org.hibernate.DuplicateMappingException: Duplicate class/entity mapping com.initech.User How should I map the SpecialUsers table? What I need on the application level is a list of the User objects contained in the SpecialUsers table.

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• How to Delete all data from a table which contain self referencing foreign key

  - by Shantanu Gupta

  I have a table which has employee relationship defined within itself. i.e. EmpID Name SeniorId ----------------------- 1 A NULL 2 B 1 3 C 1 4 D 3 and so on... Where Senior ID is a foreign key whose primary key table is same with refrence column EmpId I want to clear all rows from this table without removing any constraint. How can i do this? Deletion need to be performed like this 4, 3 , 2 , 1 How can I do this

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• Show image from clipboard to defalut imageviewer of windows using c#.net

  - by Rajesh Rolen- DotNet Developer

  I am using below function to make a image of current form and set it in clipboard Image bit = new Bitmap(this.Width, this.Height); Graphics gs = Graphics.FromImage(bit); gs.CopyFromScreen(this.Location, new Point(0, 0), bit.Size); Guid guid = System.Guid.NewGuid(); string FileName = guid.ToString(); //Copy that image in the clipbaord. Image imgToCopy = Image.FromFile(Path.Combine(Environment.CurrentDirectory, FileName + ".jpg")); Clipboard.SetImage(imgToCopy); Now my image is in clipboard and i am able to show it in picturebox on other form using below code : mypicturebox.Image = Clipboard.GetImage(); Now the the problem is that i want to show it in default imageviewer of that system. so for that i think using "System.Diagnostics.Process.Start" we can do that.. but i dont know, how to find default imageviewer and how to set clipboard's image in that ... please help me out... if i find solution than thats good otherwise i am thinking to save that file from clipboard to harddisk and then view it in window's default imageviewer... please help me to resolve my problem.. i am using c#.net

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• NHibernate - does it work well with database-level cascading deletions on foreign key constraints

  - by Nelson LaQuet

  Dose nHibernate play well with database level cascading deletions? What I mean is that if I have a constraint set at the RDBMS level to cascade delete all orphans, will nHibernate invoke any custom delete logic at the application level if I were to delete an entity though nHibernate? Or should I remove the cascading deletions from the RDBMS level and just use the cascading delete feature of nHibernate itself by defining that behavior though its configuration? Thanks

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• how to clear jqgrid when i click button in asp.net mvc

  - by sandeep

  hi ,i am new to jqgrid , i'm placing the code what i did .my question is that when i click html button i need to refresh the grid value with new values?how i pass paramateres to controller? thanks in advance jQuery(document).ready(function() { $("#btnSearch").click(function() { jqGridContainer.dir. var StateId = document.getElementById('StateId').value; var CityId = document.getElementById('CityId').value; var HName = document.getElementById('HospitalName').value; alert(CityId); alert(StateId); alert(HName); if (StateId 0 && CityId == '' && HName == '') { CityId = 0; HName = 'Default'.toString(); alert("elseif0" + HName.toString()); } else if (CityId 0 && StateId == '') { alert("elseif1"); alert("Please Select State..") } else if (CityId 0 && StateId 0 && HName == '') { alert("elseif2"); alert(CityId); alert(StateId); HName = "Default"; } else { alert("else"); StateId = 0; CityId = 0; HName = "Default"; } // $("#Submit1").click(function() { // //{ function gridReload() { // //var customer = $(this).val(); // $('#list').setGridParam({ url: '/Claim/DynamicGridData/?StateId=' + StateId + '&CityId=' + CityId + '&hospname=' + HName, page: 1 // }).trigger("reloadGrid"); // Submit1.trigger("reloadGrid"); jQuery("#list").jqGrid({ url: '/Claim/DynamicGridData/?StateId=' + StateId + '&CityId=' + CityId + '&hospname=' + HName, datatype: 'json', mtype: 'GET', colNames: ['Id', 'HospitalName', 'Address', 'City', 'District', 'FaxNumber', 'PhoneNumber'], colModel: [{ name: 'HospitalId', index: 'HospitalId', width: 40, align: 'left' }, { name: 'HospitalName', index: 'HospitalName', width: 40, align: 'left' }, { name: 'Address1', Address: 'Address1', width: 300 }, { name: 'CityName', index: 'CityName', width: 100 }, { name: 'DistName', index: 'DistName', width: 100 }, { name: 'FaxNo', index: 'FaxNo', width: 100 }, { name: 'ContactNo1', index: 'PhoneNumber', width: 100 } ], jsonReader: { repeatitems: true, id: "0" }, pager: jQuery('#pager'), rowNum: 10, rowList: [5, 10, 20, 50], // sortname: 'Id,', sortname: '1', sortorder: "asc", viewrecords: true, //multiselect: true, //multikey: "ctrlKey", imgpath: '/scripts/themes/coffee/images', caption: 'Hospital Search', width: 700, height: 250 }); }); });

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• Cancel draggable dragging

  - by JohnM2

  I have a draggable (jquery-ui) element. I subscribe to it's 'drag' event. How can I cancel current draggig based on some constraints? So I want to constraint possible moves of this draggable element, but it is more custom then only based on axis or parent (containment). How can I do that?

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• Binding ListBox ItemCount to IvalueConverter

  - by Ben

  Hi All, I am fairly new to WPF so forgive me if I am missing something obvious. I'm having a problem where I have a collection of AggregatedLabels and I am trying to bind the ItemCount of each AggregatedLabel to the FontSize in my DataTemplate so that if the ItemCount of an AggregatedLabel is large then a larger fontSize will be displayed in my listBox etc. The part that I am struggling with is the binding to the ValueConverter. Can anyone assist? Many thanks! XAML Snippet <DataTemplate x:Key="TagsTemplate"> <WrapPanel> <TextBlock Text="{Binding Name, Mode=Default}" TextWrapping="Wrap" FontSize="{Binding ItemCount, Converter={StaticResource CountToFontSizeConverter}, Mode=Default}" Foreground="#FF0D0AF7"/> </WrapPanel> </DataTemplate> <ListBox x:Name="tagsList" ItemsSource="{Binding AggregatedLabels, Mode=Default}" ItemTemplate="{StaticResource TagsTemplate}" Style="{StaticResource tagsStyle}" Margin="200,10,16.171,11.88" /> AggregatedLabel Collection using (DB2DataReader dr = command.ExecuteReader()) { while (dr.Read()) { AggregatedLabelModel aggLabel = new AggregatedLabelModel(); aggLabel.ID = Convert.ToInt32(dr["LABEL_ID"]); aggLabel.Name = dr["LABEL_NAME"].ToString(); LabelData.Add(aggLabel); } } Converter public class CountToFontSizeConverter : IValueConverter { #region IValueConverter Members public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { const int minFontSize = 6; const int maxFontSize = 38; const int increment = 3; int count = (int)value; if ((minFontSize + count + increment) < maxFontSize) { return minFontSize + count + increment; } return maxFontSize; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } #endregion } AggregatedLabel Class public class AggregatedLabelModel { public int ID { get; set; } public string Name { get; set; } } CollectionView ListCollectionView labelsView = new ListCollectionView(LabelData); labelsView.GroupDescriptions.Add(new PropertyGroupDescription("Name"));

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• How to access a superclass's class attributes in Python?

  - by Brecht Machiels

  Have a look at the following code: class A(object): defaults = {'a': 1} def __getattr__(self, name): print('A.__getattr__') return self.get_default(name) @classmethod def get_default(cls, name): # some debug output print('A.get_default({}) - {}'.format(name, cls)) try: print(super(cls, cls).defaults) # as expected except AttributeError: #except for the base object class, of course pass # the actual function body try: return cls.defaults[name] except KeyError: return super(cls, cls).get_default(name) # infinite recursion #return cls.__mro__[1].get_default(name) # this works, though class B(A): defaults = {'b': 2} class C(B): defaults = {'c': 3} c = C() print('c.a =', c.a) I have a hierarchy of classes each with its own dictionary containing some default values. If an instance of a class doesn't have a particular attribute, a default value for it should be returned instead. If no default value for the attribute is contained in the current class's defaults dictionary, the superclass's defaults dictionary should be searched. I'm trying to implement this using the recursive class method get_default. The program gets stuck in an infinite recursion, unfortunately. My understanding of super() is obviously lacking. By accessing __mro__, I can get it to work properly though, but I'm not sure this is a proper solution. I have the feeling the answer is somewhere in this article, but I haven't been able to find it yet. Perhaps I need to resort to using a metaclass?

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• Datamodel diagram-software

  - by megala

  I have nearly 20 tables.I want to draw datamodel diagram for this table.But it take more time.Is it possible to draw the diagram using any datamodel software.My constraint is i give dataonly it draw the diagram automatically,please suggest any softwsre related to my constraints

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• Viewing namespaced global variables in Visual Studio debugger?

  - by Chris

  When debugging a non-managed C++ project in Visual Studio 2008, I occasionally want to see the value of a global variable. We don't have a lot of these but those that are there all declared within a namespace called 'global'. e.g. namespace global { int foo; bool bar; ... } The problem is that when the code is stopped at a breakpoint, the default debugging tooltip (from pointing at the variable name) and quickwatch (shift-f9 on the variable name) don't take the namespace into consideration and hence won't work. So for example I can point at 'foo' and nothing comes up. If I shift-f9 on foo, it will bring up the quickwatch, which then says 'CXX0017: Error: symbol "foo" not found'. I can get around that by manually editing the variable name in the quickwatch window to prefix it with "global::" (which is cumbersome considering you have to do it each time you want to quickwatch), but there is no fix for the tooltip that I can work out. Setting the 'default namespace' of the project properties doesn't help. How can I tell the VS debugger to use the namespace that it already knows the variable is declared in (since it has the declaration right there), or, alternatively, tell it a default namespace to look for variables in if it doesn't find them? My google-fu has failed to find an answer. This report lists the same problem, with MS saying it's "by design", but even so I am hoping there is some way to work around it (perhaps with clever use of autoexp.dat?)

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• Optimize date query for large child tables: GiST or GIN?

  - by Dave Jarvis

  Problem 72 child tables, each having a year index and a station index, are defined as follows: CREATE TABLE climate.measurement_12_013 ( -- Inherited from table climate.measurement_12_013: id bigint NOT NULL DEFAULT nextval('climate.measurement_id_seq'::regclass), -- Inherited from table climate.measurement_12_013: station_id integer NOT NULL, -- Inherited from table climate.measurement_12_013: taken date NOT NULL, -- Inherited from table climate.measurement_12_013: amount numeric(8,2) NOT NULL, -- Inherited from table climate.measurement_12_013: category_id smallint NOT NULL, -- Inherited from table climate.measurement_12_013: flag character varying(1) NOT NULL DEFAULT ' '::character varying, CONSTRAINT measurement_12_013_category_id_check CHECK (category_id = 7), CONSTRAINT measurement_12_013_taken_check CHECK (date_part('month'::text, taken)::integer = 12) ) INHERITS (climate.measurement) CREATE INDEX measurement_12_013_s_idx ON climate.measurement_12_013 USING btree (station_id); CREATE INDEX measurement_12_013_y_idx ON climate.measurement_12_013 USING btree (date_part('year'::text, taken)); (Foreign key constraints to be added later.) The following query runs abysmally slow due to a full table scan: SELECT count(1) AS measurements, avg(m.amount) AS amount FROM climate.measurement m WHERE m.station_id IN ( SELECT s.id FROM climate.station s, climate.city c WHERE -- For one city ... -- c.id = 5182 AND -- Where stations are within an elevation range ... -- s.elevation BETWEEN 0 AND 3000 AND 6371.009 * SQRT( POW(RADIANS(c.latitude_decimal - s.latitude_decimal), 2) + (COS(RADIANS(c.latitude_decimal + s.latitude_decimal) / 2) * POW(RADIANS(c.longitude_decimal - s.longitude_decimal), 2)) ) <= 50 ) AND -- -- Begin extracting the data from the database. -- -- The data before 1900 is shaky; insufficient after 2009. -- extract( YEAR FROM m.taken ) BETWEEN 1900 AND 2009 AND -- Whittled down by category ... -- m.category_id = 1 AND m.taken BETWEEN -- Start date. (extract( YEAR FROM m.taken )||'-01-01')::date AND -- End date. Calculated by checking to see if the end date wraps -- into the next year. If it does, then add 1 to the current year. -- (cast(extract( YEAR FROM m.taken ) + greatest( -1 * sign( (extract( YEAR FROM m.taken )||'-12-31')::date - (extract( YEAR FROM m.taken )||'-01-01')::date ), 0 ) AS text)||'-12-31')::date GROUP BY extract( YEAR FROM m.taken ) The sluggishness comes from this part of the query: m.taken BETWEEN /* Start date. */ (extract( YEAR FROM m.taken )||'-01-01')::date AND /* End date. Calculated by checking to see if the end date wraps into the next year. If it does, then add 1 to the current year. */ (cast(extract( YEAR FROM m.taken ) + greatest( -1 * sign( (extract( YEAR FROM m.taken )||'-12-31')::date - (extract( YEAR FROM m.taken )||'-01-01')::date ), 0 ) AS text)||'-12-31')::date The HashAggregate from the plan shows a cost of 10006220141.11, which is, I suspect, on the astronomically huge side. There is a full table scan on the measurement table (itself having neither data nor indexes) being performed. The table aggregates 237 million rows from its child tables. Question What is the proper way to index the dates to avoid full table scans? Options I have considered: GIN GiST Rewrite the WHERE clause Separate year_taken, month_taken, and day_taken columns to the tables What are your thoughts? Thank you!

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• Linq to Entities and outer joins issue

  - by Robert Koritnik

  Can somebody tell me, why does Linq to Entities translate many to 1 relationships to left outer joins instead of inner joins? It relation was many to 0..1. There's referential constraint on DB itself, that ensures there's a record in the right table, so inner join should be used instead. Is it possible to write LINQ in a way so they will translate to inner joins rather than left outer joins. It would speed query execution a lot.

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• Mysql InnoDB performance optimization and indexing

  - by Davide C

  Hello everybody, I have 2 databases and I need to link information between two big tables (more than 3M entries each, continuously growing). The 1st database has a table 'pages' that stores various information about web pages, and includes the URL of each one. The column 'URL' is a varchar(512) and has no index. The 2nd database has a table 'urlHops' defined as: CREATE TABLE urlHops ( dest varchar(512) NOT NULL, src varchar(512) DEFAULT NULL, timestamp timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, KEY dest_key (dest), KEY src_key (src) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 Now, I need basically to issue (efficiently) queries like this: select p.id,p.URL from db1.pages p, db2.urlHops u where u.src=p.URL and u.dest=? At first, I thought to add an index on pages(URL). But it's a very long column, and I already issue a lot of INSERTs and UPDATEs on the same table (way more than the number of SELECTs I would do using this index). Other possible solutions I thought are: -adding a column to pages, storing the md5 hash of the URL and indexing it; this way I could do queries using the md5 of the URL, with the advantage of an index on a smaller column. -adding another table that contains only page id and page URL, indexing both columns. But this is maybe a waste of space, having only the advantage of not slowing down the inserts and updates I execute on 'pages'. I don't want to slow down the inserts and updates, but at the same time I would be able to do the queries on the URL efficiently. Any advice? My primary concern is performance; if needed, wasting some disk space is not a problem. Thank you, regards Davide

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• ms sql server identity counterpart problem

  - by Guru

  hi there, I'm using MS Sql Server and I want to use identity constraint in it I know how to use it in following manner create table mytable ( c1 int primary key identity(1,1); ) the above code works fine but what if i want the identity column to have values as EMP001, EMP002,... instead of 1,2.... Thanks in advance, Guru

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• Combining the UNIQUE and CHECK constraints

  - by Bobby

  I have a table with columns a b and c, and if c is false then I only want to allow insertions if columns a and b are unique, but if c is true then a and b do not need to be unique. Example: There can only be one (foo, bar, false) in the table, but no limit on how many (foo, bar, true) there can be. I tried something like CONSTRAINT blah UNIQUE (a,b) AND CHECK (C is TRUE) but I can't figure out the correct syntax.

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• FluentNHibernate Many-To-One References where Foreign Key is not to Primary Key and column names are

  - by Todd Langdon

  I've been sitting here for an hour trying to figure this out... I've got 2 tables (abbreviated): CREATE TABLE TRUST ( TRUSTID NUMBER NOT NULL, ACCTNBR VARCHAR(25) NOT NULL ) CONSTRAINT TRUST_PK PRIMARY KEY (TRUSTID) CREATE TABLE ACCOUNTHISTORY ( ID NUMBER NOT NULL, ACCOUNTNUMBER VARCHAR(25) NOT NULL, TRANSAMT NUMBER(38,2) NOT NULL POSTINGDATE DATE NOT NULL ) CONSTRAINT ACCOUNTHISTORY_PK PRIMARY KEY (ID) I have 2 classes that essentially mirror these: public class Trust { public virtual int Id {get; set;} public virtual string AccountNumber { get; set; } } public class AccountHistory { public virtual int Id { get; set; } public virtual Trust Trust {get; set;} public virtual DateTime PostingDate { get; set; } public virtual decimal IncomeAmount { get; set; } } How do I do the many-to-one mapping in FluentNHibernate to get the AccountHistory to have a Trust? Specifically, since it is related on a different column than the Trust primary key of TRUSTID and the column it is referencing is also named differently (ACCTNBR vs. ACCOUNTNUMBER)???? Here's what I have so far - how do I do the References on the AccountHistoryMap to Trust??? public class TrustMap : ClassMap<Trust> { public TrustMap() { Table("TRUST"); Id(x => x.Id).Column("TRUSTID"); Map(x => x.AccountNumber).Column("ACCTNBR"); } } public class AccountHistoryMap : ClassMap<AccountHistory> { public AccountHistoryMap() { Table("TRUSTACCTGHISTORY"); Id (x=>x.Id).Column("ID"); References<Trust>(x => x.Trust).Column("ACCOUNTNUMBER").ForeignKey("ACCTNBR").Fetch.Join(); Map(x => x.PostingDate).Column("POSTINGDATE"); ); I've tried a few different variations of the above line but can't get anything to work - it pulls back AccountHistory data and a proxy for the Trust; however it says no Trust row with given identifier. This has to be something simple. Anyone? Thanks in advance.

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• SQL error with script to create

  - by PapaDaniel

  I used the SQL Server management studio on a table with Create Script to New and did minor changes. Give me an error "Incorrect syntax near '('" for the "(" after "WITH" /* EventType Table Creation */ CREATE TABLE [EventType] ( [pkEventID] [int] IDENTITY(1,1) NOT NULL, [Description] [nvarchar](50) NOT NULL, [BeginDate] [datetime] NOT NULL, [EndDate] [datetime] NOT NULL, [Comments] [nvarchar](500) NOT NULL, CONSTRAINT [PK_EventType] PRIMARY KEY CLUSTERED ( [pkEventID] ASC ) WITH ( PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON ) ON [PRIMARY] ) ON [PRIMARY] GO

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• Rails. Putting update logic in your migrations

  - by Daniel Abrahamsson

  A couple of times I've been in the situation where I've wanted to refactor the design of some model and have ended up putting update logic in migrations. However, as far as I've understood, this is not good practice (especially since you are encouraged to use your schema file for deployment, and not your migrations). How do you deal with these kind of problems? To clearify what I mean, say I have a User model. Since I thought there would only be two kinds of users, namely a "normal" user and an administrator, I chose to use a simple boolean field telling whether the user was an adminstrator or not. However, after I while I figured I needed some third kind of user, perhaps a moderator or something similar. In this case I add a UserType model (and the corresponding migration), and a second migration for removing the "admin" flag from the user table. And here comes the problem. In the "add_user_type_to_users" migration I have to map the admin flag value to a user type. Additionally, in order to do this, the user types have to exist, meaning I can not use the seeds file, but rather create the user types in the migration (also considered bad practice). Here comes some fictional code representing the situation: class CreateUserTypes < ActiveRecord::Migration def self.up create_table :user_types do |t| t.string :name, :nil => false, :unique => true end #Create basic types (can not put in seed, because of future migration dependency) UserType.create!(:name => "BASIC") UserType.create!(:name => "MODERATOR") UserType.create!(:name => "ADMINISTRATOR") end def self.down drop_table :user_types end end class AddTypeIdToUsers < ActiveRecord::Migration def self.up add_column :users, :type_id, :integer #Determine type via the admin flag basic = UserType.find_by_name("BASIC") admin = UserType.find_by_name("ADMINISTRATOR") User.all.each {|u| u.update_attribute(:type_id, (u.admin?) ? admin.id : basic.id)} #Remove the admin flag remove_column :users, :admin #Add foreign key execute "alter table users add constraint fk_user_type_id foreign key (type_id) references user_types (id)" end def self.down #Re-add the admin flag add_column :users, :admin, :boolean, :default => false #Reset the admin flag (this is the problematic update code) admin = UserType.find_by_name("ADMINISTRATOR") execute "update users set admin=true where type_id=#{admin.id}" #Remove foreign key constraint execute "alter table users drop foreign key fk_user_type_id" #Drop the type_id column remove_column :users, :type_id end end As you can see there are two problematic parts. First the row creation part in the first model, which is necessary if I would like to run all migrations in a row, then the "update" part in the second migration that maps the "admin" column to the "type_id" column. Any advice?

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• Add save callback to a single ActiveRecord instance, is it possible?

  - by J. Pablo Fernández

  Is it possible to add a callback to a single ActiveRecord instance? As a further constraint this is to go on a library so I don't have control over the class (except to monkey-patch it). This is more or less what I want to do: def do_something_creazy message = Message.new message.on_save_call :do_even_more_crazy_stuff end def do_even_more_crazy_stuff(message) puts "Message #{message} has been saved! Hallelujah!" end

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• How to access Youtube_it ruby query results?

  - by spectro

  I am trying to implement the youtube_it youtube api wrapper for ruby and have it working except I'm stumped as to how the query results should be accessed. Here is my query: client.videos_by(:query => "penguin", :max_results => 1) Submitting request [url=http://gdata.youtube.com/feeds/api/videos?max-results=1&start-index=1&vq=penguin]. => #<YouTubeIt::Response::VideoSearch:0xb6c41b14 @feed_id="http://gdata.youtube.com/feeds/api/videos", @updated_at=Wed Nov 03 18:01:39 UTC 2010, @videos=[#<YouTubeIt::Model::Video:0xb6c424d8 @thumbnails=[#<YouTubeIt::Model::Thumbnail:0xb6c6b694 @url="http://i.ytimg.com/vi/oSbLpQEZP1Y/2.jpg", @width=120, @height=90, @time="00:01:34">, #<YouTubeIt::Model::Thumbnail:0xb6c6b248 @url="http://i.ytimg.com/vi/oSbLpQEZP1Y/1.jpg", @width=120, @height=90, @time="00:00:47">, #<YouTubeIt::Model::Thumbnail:0xb6c6a988 @url="http://i.ytimg.com/vi/oSbLpQEZP1Y/3.jpg", @width=120, @height=90, @time="00:02:21">, #<YouTubeIt::Model::Thumbnail:0xb6c69e34 @url="http://i.ytimg.com/vi/oSbLpQEZP1Y/0.jpg", @width=320, @height=240, @time="00:01:34">], @categories=[#<YouTubeIt::Model::Category:0xb6ca5d6c @term="Music", @label="Music">], @noembed=false, @racy=false, @favorite_count=7862, @duration=188, @author=#<YouTubeIt::Model::Author:0xb6c9942c @name="wili", @uri="http://gdata.youtube.com/feeds/api/users/wili">, @updated_at=Tue Nov 02 08:45:25 UTC 2010, @longitude=nil, @position=nil, @view_count=1682350, @html_content="penguin", @media_content=[#<YouTubeIt::Model::Content:0xb6c770d4 @url="http://www.youtube.com/v/oSbLpQEZP1Y?f=videos&app=youtube_gdata", @duration=188, @format=#<YouTubeIt::Model::Video::Format:0xb656d108 @name=:swf, @format_code=5>, @default=true, @mime_type="application/x-shockwave-flash">, #<YouTubeIt::Model::Content:0xb6c766d4 @url="rtsp://v5.cache3.c.youtube.com/CiILENy73wIaGQlWPxkBpcsmoRMYDSANFEgGUgZ2aWRlb3MM/0/0/0/video.3gp", @duration=188, @format=#<YouTubeIt::Model::Video::Format:0xb656d11c @name=:rtsp, @format_code=1>, @default=false, @mime_type="video/3gpp">, #<YouTubeIt::Model::Content:0xb6c75d38 @url="rtsp://v8.cache3.c.youtube.com/CiILENy73wIaGQlWPxkBpcsmoRMYESARFEgGUgZ2aWRlb3MM/0/0/0/video.3gp", @duration=188, @format=#<YouTubeIt::Model::Video::Format:0xb656d0f4 @name=:three_gpp, @format_code=6>, @default=false, @mime_type="video/3gpp">], @description="penguin", @latitude=nil, @title="penguin", @published_at=Mon May 08 18:11:01 UTC 2006, @player_url="http://www.youtube.com/watch?v=oSbLpQEZP1Y&feature=youtube_gdata_player", @rating=#<YouTubeIt::Model::Rating:0xb6c5eb4c @min=1, @max=5, @average=4.676985, @rater_count=2746>, @keywords=["pigloo", "penguin"], @video_id="http://gdata.youtube.com/feeds/api/videos/oSbLpQEZP1Y", @where=nil>], @total_result_count=291282, @offset=1, @max_result_count=1> I would like to retrieve the URL and thumbnail links. Any ideas?

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• Is this a good or bad way to use constructor chaining? (... to allow for testing).

  - by panamack

  My motivation for chaining my class constructors here is so that I have a default constructor for mainstream use by my application and a second that allows me to inject a mock and a stub. It just seems a bit ugly 'new'-ing things in the ":this(...)" call and counter-intuitive calling a parametrized constructor from a default constructor , I wondered what other people would do here? (FYI - SystemWrapper) using SystemWrapper; public class MyDirectoryWorker{ // SystemWrapper interface allows for stub of sealed .Net class. private IDirectoryInfoWrap dirInf; private FileSystemWatcher watcher; public MyDirectoryWorker() : this( new DirectoryInfoWrap(new DirectoryInfo(MyDirPath)), new FileSystemWatcher()) { } public MyDirectoryWorker(IDirectoryInfoWrap dirInf, FileSystemWatcher watcher) { this.dirInf = dirInf; if(!dirInf.Exists){ dirInf.Create(); } this.watcher = watcher; watcher.Path = dirInf.FullName; watcher.NotifyFilter = NotifyFilters.FileName; watcher.Created += new FileSystemEventHandler(watcher_Created); watcher.Deleted += new FileSystemEventHandler(watcher_Deleted); watcher.Renamed += new RenamedEventHandler(watcher_Renamed); watcher.EnableRaisingEvents = true; } public static string MyDirPath{get{return Settings.Default.MyDefaultDirPath;}} // etc... }

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• how do I set an entity parameter to be UNIQUE in the entity designer?

  - by Greg

  how do I set an entity parameter to be UNIQUE in the entity designer? that is such that it will cause the database also set set a uniqueness constraint in the database too

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• Stored procedure using cursor in mySql.

  - by RAVI

  I wrote a stored procedure using cursor in mysql but that procedure is taking 10 second to fetch the result while that result set have only 450 records so, I want to know that why that proedure is taking that much time to fetch tha record. procedure as below: DELIMITER // DROP PROCEDURE IF EXISTS curdemo123// CREATE PROCEDURE curdemo123(IN Branchcode int,IN vYear int,IN vMonth int) BEGIN DECLARE EndOfData,tempamount INT DEFAULT 0; DECLARE tempagent_code,tempplantype,tempsaledate CHAR(12); DECLARE tempspot_rate DOUBLE; DECLARE var1,totalrow INT DEFAULT 1; DECLARE cur1 CURSOR FOR select SQL_CALC_FOUND_ROWS ad.agentCode,ad.planType,ad.amount,ad.date from adplan_detailstbl ad where ad.branchCode=Branchcode and (ad.date between '2009-12-1' and '2009-12-31')order by ad.NUM_ID asc; DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET EndOfData = 1; DROP TEMPORARY TABLE IF EXISTS temptable; CREATE TEMPORARY TABLE temptable (agent_code varchar(15), plan_type char(12),sale double,spot_rate double default '0.0', dATE DATE); OPEN cur1; SET totalrow=FOUND_ROWS(); while var1 <= totalrow DO fetch cur1 into tempagent_code,tempplantype,tempamount,tempsaledate; IF((tempplantype='Unit Plan' OR tempplantype='MIP') OR tempplantype='STUP') then select spotRate into tempspot_rate from spot_amount where ((monthCode=vMonth and year=vYear) and ((agentCode=tempagent_code and branchCode=Branchcode) and (planType=tempplantype))); INSERT INTO temptable VALUES(tempagent_code,tempplantype,tempamount,tempspot_rate,tempsaledate); else INSERT INTO temptable(agent_code,plan_type,sale,dATE) VALUES(tempagent_code,tempplantype,tempamount,tempsaledate); END IF; SET var1=var1+1; END WHILE; CLOSE cur1; select * from temptable; DROP TABLE temptable; END // DELIMITER ;

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• Cannot write to SD card -- canWrite is returning false

  - by Fizz

  Sorry for the ambiguous title but I'm doing the following to write a simple string to a file: try { File root = Environment.getExternalStorageDirectory(); if (root.canWrite()){ System.out.println("Can write."); File def_file = new File(root, "default.txt"); FileWriter fw = new FileWriter(def_file); BufferedWriter out = new BufferedWriter(fw); String defbuf = "default"; out.write(defbuf); out.flush(); out.close(); } else System.out.println("Can't write."); }catch (IOException e) { e.printStackTrace(); } But root.canWrite() seems to be returning false everytime. I am not running this off of an emulator, I have my android Eris plugged into my computer via USB and running the app off of my phone via Eclipse. Is there a way of giving my app permission so this doesn't happen? Also, this code seems to be create the file default.txt but what if it already exists, will it ignore the creation and just open it to write or do I have to catch something like FileAlreadyExists(if such an exception exists) which then just opens it and writes? Thanks for any help guys.

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