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  • Cannot add or update a child row: a foreign key constraint fails

    - by Tom
    table 1 +----------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------+-------------+------+-----+---------+----------------+ | UserID | int(11) | NO | PRI | NULL | auto_increment | | Password | varchar(20) | NO | | | | | Username | varchar(25) | NO | | | | | Email | varchar(60) | NO | | | | +----------+-------------+------+-----+---------+----------------+ table2 +------------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +------------------+--------------+------+-----+---------+----------------+ | UserID | int(11) | NO | MUL | | | | PostID | int(11) | NO | PRI | NULL | auto_increment | | Title | varchar(50) | NO | | | | | Summary | varchar(500) | NO | | | | +------------------+--------------+------+-----+---------+----------------+ com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (myapp/table2, CONSTRAINT table2_ibfk_1 FOREIGN KEY (UserID) REFERENCES table1 (UserID)) What have I done wrong? I read this: http://www.w3schools.com/Sql/sql_foreignkey.asp and i don't see whats wrong. :S

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  • Executing Multiple Lines in Python

    - by metashockwave
    When Python is first installed, the default setting executes users' code input line-by-line. But sometimes I need to write programs that executes multiple lines at once. Is there a setting in Python where I can change the code execution to one block at once? Thanks if (n/2) * 2 == n:; print 'Even'; else: print 'Odd' SyntaxError: invalid syntax When I tried to run the above code, I got an invalid syntax error on ELSE

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  • Change date format (in DB or output) to dd/mm/yyyy - PHP MySQL

    - by Jess
    MySQL stores the date in my database (by default) as 'YYYY-MM-DD' The field type for my date is 'DATE' (I do not need any time storage).. Is there a simple way to change it by default to DD/MM/YYYY ? I call up different dates in 2 different tables, and no where in any of my code do I have anything resembling a date variable or anything! Hopefully this is a straight forward change?

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  • Can I rewrite the whole url?

    - by Yaroslav Yakovlev
    I need to rewrite the whole url. E.g. I have a http://UrlToRewrite.com/default.aspx?myParams=myvalues and I need it to be http://SingleUrl.com Is it possible to make such a thing with default url rewriters? Another question is, is it possible to make the same thing, but depending on the parameter destination url will be http://SingleUrl1.com and http://SingleUrl2.com.

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  • How are classes more secure than structures ?

    - by Asad Hanif
    Structure's member are public by default ans class's members are private by default. We can access private data members through a proper channel (using member function). If we have access to member functions we can read/write data in private data member, so how it is secure...we are accessing it and we are changing data too.....

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  • Does variable = null set it for garbage collection

    - by manyxcxi
    Help me settle a dispute with a coworker: Does setting a variable or collection to null in Java aid in garbage collection and reducing memory usage? If I have a long running program and each function may be iteratively called (potentially thousands of times): Does setting all the variables in it to null before returning a value to the parent function help reduce heap size/memory usage?

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  • How to Keep the selected value of the select box after Form POST or GET

    - by Rajasekar
    Im trying to implement the search feature in my website. when the search keyword is entered in the textbox, and the category combo is selected, the form will be Posted and the result will be shown on the same page. what i want is to keep the selected category of the combo by default in the form after posted For eg., If i select the category 'Automobiles' in the combo and click search, after form submit, the combo should show the automobiles as default selected option. Please help me. Any help will be appreciated

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  • DLL configuration file in asp.net site

    - by Tominator
    Hi, I've made a .net 2.0 librabry project, that results in a dll. I've made an app.config file in my project, with settings used in the dll, with the intention that they can be changed later. I'm attempting to use the dll in an asp.net web application now, so I made the reference to my other project's output, and I see that the dll is copied over to the site's bin folder, and everything works. However, the configuration file is not copied. When I manually copy the app.config and rename it to myDll.config, it has no influence. The contents of the config file is approximately this: <?xml version="1.0" encoding="utf-8" ?> <configuration> <configSections> <sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" > <section name="myDLL.My.MySettings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" /> </sectionGroup> </configSections> <applicationSettings> <myDLL.My.MySettings> <setting name="myDLL_webservice_Service" serializeAs="String"> <value>https://myhost/Service.asmx</value> </setting> <setting name="ID" serializeAs="String"> <value>6</value> </setting> </myDLL.My.MySettings> </applicationSettings> </configuration> And I use its settings in the dll with this (vb.net code): Private _id As Long = My.Settings.ID How can I put my config information somewhere so it can be used? In the web.config of the site application? That has only the appSettings section, and it uses the syntax. It doesn't appear to work though. In a custom file format that I create and use? Not that pretty..

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  • Java NullPointerException. Why?

    - by user292844
    I am new to Java. I just read that class variables in Java have default value. I tried the following program. I was expecting to get the output as 0, which is the default value on an integer, but I get the NullPointerException. What am I missing? class Test{ static Integer iVar; public static void main(String...args) { System.out.println(iVar.intValue()); } }

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  • editText not centering

    - by Will Nasby
    I have a large editText that no matter what I try, won't center. I have tried putting it in a horizontal and vertical linear layout and then setting that gravity to center because setting the imageText's gravity to center, it still hugs the left of my activity. <EditText android:id="@+id/editText1" android:layout_width="250dp" android:layout_height="wrap_content" android:ems="10" android:gravity="center" android:lines="8" android:maxLines="8" android:minLines="8" > </EditText> And here is what it is doing:

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  • Lauching Lotus Notes with mailto:

    - by SKR
    I have a mailto url in a web page. The target system contains both Microsoft Outlook and Lotus Notes. Microsoft Outlook is the **default** Mail Client. So when i click on *mailto* link it opens up Microsoft Outlook. I want it to open Lotus Notes when i click on the link and i do **NOT** want change the default mail client settings in Internet Options as well. Please suggest a solution or work around to achive this.

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  • How to access CRM 4.0 settings programmatically?

    - by Shaamaan
    Some of the plugins I wrote (re)calculate various prices, and I used Math.Round to keep results accurate with the default 2 digit setting in CRM. But I figured... what if a user decides to set his CRM to use a different precision? So, I need to access the CRM settings programmatically, so that my functions can work with whatever setting the user chooses. How would I go about accessing the General (and, possibly, other) CRM settings from my code?

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  • Wordpress > Transfer google verification file to root directory on plugin activation/install

    - by Scott B
    I've got a wordpress plugin which presets several settings in a wordpress site and creates some default pages which are the same for all my sites. I would like to include an html file in my plugin zip package that is placed into the site's root directory "as is" (same file name, etc) The file is my google verification file, which is the same for all my sites, so I'd like to save a few steps and automate the process of installing it, along with my default setup steps that my plugin handles. Any help, much appreciated.

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  • Django @ Google App Engine - Site Map Framework

    - by dkp
    Hi Folks, has anybody managed to get Djangos site map framework to run on Google App Engine? I receive the following exception: ImproperlyConfigured at /sitemap.xml You haven't set the DATABASE_ENGINE setting yet. Request Method: GET Request URL: http://127.0.0.1:8080/sitemap.xml Exception Type: ImproperlyConfigured Exception Value: You haven't set the DATABASE_ENGINE setting yet. Exception Location: D:\Program Files\Google\google_appengine\lib\django\django\db\backends\dummy\base.py in complain, line 13

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  • can't access to an extension method with UrlHelper parameter in controller! Vice versa in view have

    - by Sadegh
    why defined extension method with UrlHelper don't added in Url.EXTENSIONMETHOD when i want to use it in controller! but i have access to it in view? public static string Home(this UrlHelper helper) { return helper.RouteUrl("ABC", new { controller = "ABC", Action = "Default" }); } i haven't access: public ActionResult Default() { return Redirect(Url.Home()); } i have access in view: <a href="<%=Url.Home() %>" title="Hello">Hello</a>

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  • flash cs4: how can i change mouse cursor as if i'm on a button ?

    - by ufk
    Hiya. I have some MovieClips that act like buttons, how can i do that when the user hovers on the movieclip, the mouse cursor will change to a hand or the default cursor when it hovers a button. i don't want to create my own custom cursor, i want to use the default set of cursors that come with flash. thanks using flash cs4, action script 3

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  • C struct memory layout?

    - by Eonil
    I have C# background. Very newbie to low level language like C. In C#, memory layout by compiler by default, and I have to specify some special attribute to override this behavior for exact layout. As I know, C does not re-align by default. But I heard there's a little re-aligning behavior which very hard to find. Can I know about C's memory layout behavior? (what should be re-aligned and not)

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  • How do I configure emacs speedbar for C# mode?

    - by Alex B
    I'm using emacs with C# Mode and when I turn on the speedbar, no files show up by default. I can choose "show all files" on the speedbar mode, but then every .cs file shows up with a '[?]' next to the name. How do I properly configure speedbar so it shows up with .cs files by default? How do I get the '[+]' next to each file so I can navigate inside the file?

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  • Jquery get links where id is empty

    - by gulbaek
    Hi I need to change the font color on the first link. <a href="/default.aspx" class="content">Frontpage</a> <a href="/default.aspx" class="content" id="product_randomnumber_link">Frontpage</a> But I just can't figure out a way to only select the first a.

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