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  • Foreign Key Relationship in Rails

    - by Steve
    Hi...I am a beginner in Rails and I read that the Rails enforces the foreign key relationships at the model level and also at the database level in the migration file, while creating the table. Is it really necessary and what kind of advantage does it provide

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  • Performance for myCollection.Add() vs. myCollection["key"]

    - by Atomiton
    When dealing with a collection of key/value pairs is there any difference between using its Add() method and directly assigning it? For example, a HtmlGenericControl will have an Attributes Collection: var anchor = new HtmlGenericControl("a"); // These both work: anchor.Attributes.Add("class", "xyz"); anchor.Attributes["class"] = "xyz"; Is it purely a matter of preference, or is there a reason for doing one or the other?

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  • OperationalError: foreign key mismatch

    - by Niek de Klein
    I have two tables that I'm filling, 'msrun' and 'feature'. 'feature' has a foreign key pointing to the 'msrun_name' column of the 'msrun' table. Inserting in the tables works fine. But when I try to delete from the 'feature' table I get the following error: pysqlite2.dbapi2.OperationalError: foreign key mismatch From the rules of foreign keys in the manual of SQLite: - The parent table does not exist, or - The parent key columns named in the foreign key constraint do not exist, or - The parent key columns named in the foreign key constraint are not the primary key of the parent table and are not subject to a unique constraint using collating sequence specified in the CREATE TABLE, or - The child table references the primary key of the parent without specifying the primary key columns and the number of primary key columns in the parent do not match the number of child key columns. I can see nothing that I'm violating. My create tables look like this: DROP TABLE IF EXISTS `msrun`; -- ----------------------------------------------------- -- Table `msrun` -- ----------------------------------------------------- CREATE TABLE IF NOT EXISTS `msrun` ( `msrun_name` VARCHAR(40) PRIMARY KEY NOT NULL , `description` VARCHAR(500) NOT NULL ); DROP TABLE IF EXISTS `feature`; -- ----------------------------------------------------- -- Table `feature` -- ----------------------------------------------------- CREATE TABLE IF NOT EXISTS `feature` ( `feature_id` VARCHAR(40) PRIMARY KEY NOT NULL , `intensity` DOUBLE NOT NULL , `overallquality` DOUBLE NOT NULL , `charge` INT NOT NULL , `content` VARCHAR(45) NOT NULL , `msrun_msrun_name` VARCHAR(40) NOT NULL , CONSTRAINT `fk_feature_msrun1` FOREIGN KEY (`msrun_msrun_name` ) REFERENCES `msrun` (`msrun_name` ) ON DELETE NO ACTION ON UPDATE NO ACTION); CREATE UNIQUE INDEX `id_UNIQUE` ON `feature` (`feature_id` ASC); CREATE INDEX `fk_feature_msrun1` ON `feature` (`msrun_msrun_name` ASC); As far as I can see the parent table exists, the foreign key is pointing to the right parent key, the parent key is a primary key and the foreign key specifies the primary key column. The script that produces the error: from pysqlite2 import dbapi2 as sqlite import parseFeatureXML connection = sqlite.connect('example.db') cursor = connection.cursor() cursor.execute("PRAGMA foreign_keys=ON") inputValues = ('example', 'description') cursor.execute("INSERT INTO `msrun` VALUES(?, ?)", inputValues) featureXML = parseFeatureXML.Reader('../example_scripts/example_files/input/featureXML_example.featureXML') for feature in featureXML.getSimpleFeatureInfo(): inputValues = (featureXML['id'], featureXML['intensity'], featureXML['overallquality'], featureXML['charge'], featureXML['content'], 'example') # insert the values into msrun using ? for sql injection safety cursor.execute("INSERT INTO `feature` VALUES(?,?,?,?,?,?)", inputValues) connection.commit() for feature in featureXML.getSimpleFeatureInfo(): cursor.execute("DELETE FROM `feature` WHERE feature_id = ?", (str(featureXML['id']),))

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  • Mysql Removal of primary key

    - by marionmaiden
    Hello, I've removed the primary key of one table of my MySQL database, but now, when I use the MySQL Administrator and try to edit the data of this table, it doesn't allow me to do this. The button edit that appears in the bottom of the table keeps visible, but unable to click.

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  • Multi-Column Primary Key in MySQL 5

    - by Kaji
    I'm trying to learn how to use keys and to break the habit of necessarily having SERIAL type IDs for all rows in all my tables. At the same time, I'm also doing many-to-many relationships, and so requiring unique values on either column of the tables that coordinate the relationships would hamper that. How can I define a primary key on a table such that any given value can be repeated in any column, so long as the combination of values across all columns is never repeated exactly?

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  • Removal of table primary key in MySQL

    - by marionmaiden
    Hello, I've removed the primary key of one table of my MySQL database, but now, when I use the MySQL Administrator and try to edit some data of this table, it doesn't allow me to do this. The button edit that appears in the bottom of the table keeps visible, but disabled to click.

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  • primary key datatype in sql server database

    - by ooo
    i see after installing the asp.net membership tables, they use the data type "uniqueidentifier" for all of the primary key fields. I have been using "int" data type and doing increment by one on inserts. Is there any particular benefits to using the uniqueIdentifier data type compared to my current model of using int and auto increments on new inserts ?

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  • Reducing WPF binding boilerplate with styles - updating the bindings themselves via styling?

    - by Eamon Nerbonne
    I'm still learning the WPF ropes, so if the following question is trivial or my approach wrong-headed, please do speak up... I'm trying to reduce boilerplate and it sounds like styles are a common way to do so. In particular: I've got a bunch of fairly mundane data-entry fields. The controls for these fields have various properties I'd like to set based on the target of the binding - pretty normal stuff. However, I'd also like to set properties of the binding itself in the style to avoid repetitiveness. For example: <TextBox Style="{StaticResource myStyle}"> <TextBox.Text> <Binding Path="..." Source="..." ValidatesOnDataErrors="True" ValidatesOnExceptions="True" UpdateSourceTrigger="PropertyChanged"> </Binding> </TextBox.Text> </TextBox> Now, is there any way to use styling - or some other technique to write the previous example somewhat like this: <TextBox Style="{StaticResource myStyle}" Text="{Binding Source=... Path=...}/> That is, is there any way to set all bindings that match a particular selection (here, on controls with the myStyle style) to validate data and to use a particular update trigger? Is it possible to template or style bindings themselves? Clearly, the second syntax is much, much shorter and more readable, and I'd love to be able to get rid of other similar boilerplate to keep my UI code comprehensible to myself :-).

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  • Apprentissage de PySide, le binding Qt de Nokia pour Python, un article de Charles-Elie Gentil

    Bonjour, Vous trouverez ci-dessous le lien vers un tutoriel destiné à aider le programmeur Python à l'apprentissage de PySide, le binding Qt de Nokia pour Python. Il part de la présentations des widgets de bases jusqu'à la conception d'un programme minimaliste. Bonne lecture à tous et n'hésitez pas à poster vos commentaires. Apprentissage de PySide, le binding Qt de Nokia pour Python et création d'une première application...

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  • How to emulate Fn (function key) keypress in xte

    - by komputes
    xte is part of the xautomation package. After hours of man page reading and looking for documentation or working examples, I still cannot get xte to emulate a Fn-F7 keypress. xte 'keydown Meta_L' 'key F7' 'keyup Meta_L' I've tried Meta_L, Meta_R, Multi_key, key F7, keydown F7 then keyup F7. No combination seems to work. Any idea how I can emulate a combination key press with a Fn key from a command/script?

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  • Searching for a key in a multi dimensional array and adding it to another array [migrated]

    - by Moha
    Let's say I have two multi dimensional arrays: array1 ( stuff1 = array ( data = 'abc' ) stuff2 = array ( something = '123' data = 'def' ) stuff3 = array ( stuff4 = array ( data = 'ghi' ) ) ) array2 ( stuff1 = array ( ) stuff3 = array ( anything = '456' ) ) What I want is to search the key 'data' in array1 and then insert the key and value to array2 regardless of the depth. So wherever key 'data' exists in array1 it gets added to array2 with the exact depth (and key names) as in array1 AND without modifying any other keys. How can I do this recursively?

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  • Couldn't generate PGP key: General Error

    - by Nicky Bailuc
    I want to get involved with Ubuntu and I've decided to join the Bug Squad. Launchpad tells me that I have to some OpenPGP Fingerprint key, and I followed instructions from this link: https://launchpad.net/+help-registry/openpgp-keys.html#publish All goes fine, I enter all the necessary information, and it starts generating the key. After about 20 seconds of generating the key, it gives an error saying "Couldn't generate PGP key: General Error." What does this mean? How can I fix this?

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  • Still prompted for a password after adding SSH public key to a server

    - by Nathan Arthur
    I'm attempting to setup a git repository on my Dreamhost web server by following the "Setup: For the Impatient" instructions here. I'm having difficulty setting up public key access to the server. After successfully creating my public key, I ran the following command: cat ~/.ssh/[MY KEY].pub | ssh [USER]@[MACHINE] "mkdir ~/.ssh; cat >> ~/.ssh/authorized_keys" ...replacing the appropriate placeholders with the correct values. Everything seemed to go through fine. The server asked for my password, and, as far as I can tell, executed the command. There is indeed a ~/.ssh/authorized_keys file on the server. The problem: When I try to SSH into the server, it still asks for my password. My understanding is that it shouldn't be asking for my password anymore. What am I missing? EDIT: SSH -v Log: Macbook:~ michaeleckert$ ssh -v [USER]@[SERVER URL] OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011 debug1: Reading configuration data /etc/ssh_config debug1: /etc/ssh_config line 20: Applying options for * debug1: /etc/ssh_config line 53: Applying options for * debug1: Connecting to [SERVER URL] [[SERVER IP]] port 22. debug1: Connection established. debug1: identity file /Users/michaeleckert/.ssh/id_rsa type -1 debug1: identity file /Users/michaeleckert/.ssh/id_rsa-cert type -1 debug1: identity file /Users/michaeleckert/.ssh/id_dsa type -1 debug1: identity file /Users/michaeleckert/.ssh/id_dsa-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.2 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.5p1 Debian-6+squeeze3 debug1: match: OpenSSH_5.5p1 Debian-6+squeeze3 pat OpenSSH_5* debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: RSA [STRING OF NUMBERS AND LETTERS SEPARATED BY SEMI-COLONS] debug1: Host ‘[SERVER URL]' is known and matches the RSA host key. debug1: Found key in /Users/michaeleckert/.ssh/known_hosts:2 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /Users/michaeleckert/.ssh/id_rsa debug1: Trying private key: /Users/michaeleckert/.ssh/id_dsa debug1: Next authentication method: password [USER]@[SERVER URL]'s password: debug1: Authentication succeeded (password). Authenticated to [SERVER URL] ([[SERVER IP]]:22). debug1: channel 0: new [client-session] debug1: Requesting [email protected] debug1: Entering interactive session. debug1: Sending environment. debug1: Sending env LANG = en_US.UTF-8 Welcome to [SERVER URL] Any malicious and/or unauthorized activity is strictly forbidden. All activity may be logged by DreamHost Web Hosting. Last login: Sun Nov 3 12:04:21 2013 from [MY IP] [[SERVER NAME]]$

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  • No public key GPG error when submitting quickly application

    - by Roberto
    I try to submit my app with the command in the title, but the build failed: Error message: W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY * * is my key (don't know it is safe to share it) If i run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys ****** It is said my key isn't change (so don't need to add it again). Any idea?

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  • WPF - List View Row Index and Validation

    - by abhishek
    Hi, I have a ListView with TextBoxes in second column. I want to validate that my text box does not contain a number if the third column(data_type) is "Text". I am unable to do the validation. I tried a few approaches. In one approach I try to handle the MouseDown event and am trying to get the Row number so that I can get the data_type value of that row. I want to us this value in the Validate method. I have been struggling for a week now. Would appreciate if anybody could help. <ControlTemplate x:Key="validationTemplate"> <DockPanel> <TextBlock Foreground="Red" FontSize="20">!</TextBlock> <AdornedElementPlaceholder/> </DockPanel> </ControlTemplate> <Style x:Key="textBoxInError" TargetType="{x:Type TextBox}"> <Style.Triggers> <Trigger Property="Validation.HasError" Value="true"> <Setter Property="ToolTip" Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=(Validation.Errors)[0].ErrorContent}"/> </Trigger> </Style.Triggers> </Style> <DataTemplate x:Key="textTemplate"> <TextBox HorizontalAlignment= "Stretch" IsEnabled="{Binding XPath=./@isenabled}" Validation.ErrorTemplate="{StaticResource validationTemplate}" Style="{StaticResource textBoxInError}"> <TextBox.Text> <Binding XPath="./@value" UpdateSourceTrigger="PropertyChanged"> <Binding.ValidationRules> <local:TextBoxMinMaxValidation> <local:TextBoxMinMaxValidation.DataType> <local:DataTypeCheck Datatype="{Binding Source={StaticResource dataProvider}, XPath='/[@id=CustomerServiceQueueName]'}"/> </local:TextBoxMinMaxValidation.DataType> <local:TextBoxMinMaxValidation.ValidRange> <local:Int32RangeChecker Minimum="{Binding Source={StaticResource dataProvider}, XPath=./@min}" Maximum="{Binding Source={StaticResource dataProvider}, XPath=./@max}"/> </local:TextBoxMinMaxValidation.ValidRange> </local:TextBoxMinMaxValidation> </Binding.ValidationRules> </Binding > </TextBox.Text> </TextBox> </DataTemplate> <DataTemplate x:Key="dropDownTemplate"> <ComboBox Name="cmbBox" HorizontalAlignment="Stretch" SelectedIndex="{Binding XPath=./@value}" ItemsSource="{Binding XPath=.//OPTION/@value}" IsEnabled="{Binding XPath=./@isenabled}" /> </DataTemplate> <DataTemplate x:Key="booldropDownTemplate"> <ComboBox Name="cmbBox" HorizontalAlignment="Stretch" SelectedIndex="{Binding XPath=./@value, Converter={StaticResource boolconvert}}"> <ComboBoxItem>True</ComboBoxItem> <ComboBoxItem>False</ComboBoxItem> </ComboBox> </DataTemplate> <local:ControlTemplateSelector x:Key="myControlTemplateSelector"/> <Style x:Key="StretchedContainerStyle" TargetType="{x:Type ListViewItem}"> <Setter Property="HorizontalContentAlignment" Value="Stretch" /> <Setter Property="Template" Value="{DynamicResource ListBoxItemControlTemplate1}"/> </Style> <ControlTemplate x:Key="ListBoxItemControlTemplate1" TargetType="{x:Type ListBoxItem}"> <Border SnapsToDevicePixels="true" x:Name="Bd" Background="{TemplateBinding Background}" BorderBrush="{DynamicResource {x:Static SystemColors.ActiveBorderBrushKey}}" Padding="{TemplateBinding Padding}" BorderThickness="0,0.5,0,0.5"> <GridViewRowPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/> </Border> </ControlTemplate> <Style x:Key="CustomHeaderStyle" TargetType="{x:Type GridViewColumnHeader}"> <Setter Property="Background" Value="LightGray" /> <Setter Property="FontWeight" Value="Bold"/> <Setter Property="FontFamily" Value="Arial"/> <Setter Property="HorizontalContentAlignment" Value="Left" /> <Setter Property="Padding" Value="2,0,2,0"/> </Style> </UserControl.Resources> <Grid x:Name="GridViewControl" Height="Auto"> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="34"/> </Grid.RowDefinitions> <ListView x:Name="ListViewControl" Grid.Row="0" ItemContainerStyle="{DynamicResource StretchedContainerStyle}" ItemTemplateSelector="{DynamicResource myControlTemplateSelector}" IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding Source={StaticResource dataProvider}, XPath=//CONFIGURATION}"> <ListView.View > <GridView > <GridViewColumn Header="ID" HeaderContainerStyle="{StaticResource CustomHeaderStyle}" DisplayMemberBinding="{Binding XPath=./@id}"/> <GridViewColumn Header="VALUE" HeaderContainerStyle="{StaticResource CustomHeaderStyle}" CellTemplateSelector="{DynamicResource myControlTemplateSelector}" /> <GridViewColumn Header="DATATYPE" HeaderContainerStyle="{StaticResource CustomHeaderStyle}" DisplayMemberBinding="{Binding XPath=./@data_type}"/> <GridViewColumn Header="DESCRIPTION" HeaderContainerStyle="{StaticResource CustomHeaderStyle}" DisplayMemberBinding="{Binding XPath=./@description}" Width="{Binding ElementName=ListViewControl, Path=ActualWidth}"/> </GridView> </ListView.View> </ListView> <StackPanel Grid.Row="1"> <Button Grid.Row="1" HorizontalAlignment="Stretch" Height="34" HorizontalContentAlignment="Stretch" > <StackPanel HorizontalAlignment="Stretch" VerticalAlignment="Center" Orientation="Horizontal" FlowDirection="RightToLeft" Height="30"> <Button Grid.Row="1" Content ="Apply" Padding="0,0,0,0 " Margin="6,2,0,2" Name="btn_Apply" HorizontalAlignment="Right" VerticalContentAlignment="Center" HorizontalContentAlignment="Center" Width="132" IsTabStop="True" Click="btn_ApplyClick" Height="24" /> </StackPanel > </Button> </StackPanel > </Grid>

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  • Asp.Net MVC Create/Update/Delete with composite key

    - by nubm
    Hi, I'm not sure how to use composite key. My Categories table has CategoryId (PK,FK), LanguageId (PK,FK), CategoryName CategoryId | LanguageId | CategoryName 1 | 1 | Car 1 | 2 | Auto 1 | 3 | Automobile etc. I'm following this design The default action looks like // // GET: /Category/Edit/5 public ActionResult Edit(int id) { return View(); } and ActionLink <%= Html.ActionLink("Edit", "Edit", new { id= item.CategoryId }) %> Should I use something like <%= Html.ActionLink("Edit", "Edit", new { id= (item.CategoryId + "-" + item.LanguageId) }) %> so the url is /Category/Edit/5-5 and // // GET: /Category/Edit/5-5 public ActionResult Edit(string id) { // parse id return View(); } or change the route to something like /Category/Edit/5/5 Or there is some better way?

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  • ROO: how to create composit primary key in Entity

    - by Paul
    Hi, What can I do if I need to create entity for a table in production DB (Oracle 10g) with composite primary key. For example: [CODE] CREATE TABLE TACCOUNT ( BRANCHID NUMBER(3) NOT NULL, ACC VARCHAR2(18 BYTE) NOT NULL, DATE_OPEN DATE NOT NULL, DATE_CLOSE DATE, NOTE VARCHAR2(38 BYTE) ); CREATE UNIQUE INDEX PK_TACCOUNT ON TACCOUNT (BRANCHID, ACC); I don't want to change the structure of this table. Is it possible to create an "id" field using roo commands? I use Spring Roo 1.0.2.RELEASE [rev 638] Paul

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  • Rails Foreign key setup question.

    - by James P. Wright
    I'm just (re)starting playing around with Rails and I'm making a little card game app. I cannot seem to figure out my Foreign Key setups. Say I have 4 objects: - Game - Player - Hand - Card A Game has many Players, which have many Hands which have many Cards. But the cards are also independent of a Hand, Player and Game. For example, I have 6 Cards in my database (1 to 6). It is possible that Card 3 could be in 2 Players Hands in the same Game. How can I set up my keys for this? Should I just create another object for "CardInHand" to simplify it?

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  • How to generate SSH key pairs with Python

    - by Lee
    Hello, I'm attempting to write a script to generate SSH Identity key pairs for me. from M2Crypto import RSA key = RSA.gen_key(1024, 65337) key.save_key("/tmp/my.key", cipher=None) The file /tmp/my.key looks great now. By running ssh-keygen -y -f /tmp/my.key > /tmp/my.key.pub I can extract the public key. My question is how can I extract the public key from python? Using key.save_pub_key("/tmp/my.key.pub") saves something like: -----BEGIN PUBLIC KEY----- MFwwDQYJKoZIhvcNAQEBBQADASDASDASDASDBarYRsmMazM1hd7a+u3QeMP ... FZQ7Ic+BmmeWHvvVP4Yjyu1t6vAut7mKkaDeKbT3yiGVUgAEUaWMXqECAwEAAQ== -----END PUBLIC KEY----- When I'm looking for something like: ssh-rsa AAAABCASDDBM$%3WEAv/3%$F ..... OSDFKJSL43$%^DFg==

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