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  • please explain NHibernate HiLo

    - by Ben
    I'm struggling to get my head round how the HiLo generator works in NHibernate. I've read the explanation here which made things a little clearer. My understanding is that each SessionFactory retrieves the high value from the database. This improves performance because we have access to IDs without hitting the database. The explanation from the above link also states: For instance, supposing you have a "high" sequence with a current value of 35, and the "low" number is in the range 0-1023. Then the client can increment the sequence to 36 (for other clients to be able to generate keys while it's using 35) and know that keys 35/0, 35/1, 35/2, 35/3... 35/1023 are all available. How does this work in a web application as don't I only have one SessionFactory and therefore one hi value. Does this mean that in a disconnected application you can end up with duplicate (low) ids in your entity table? In my tests I used these settings: <id name="Id" unsaved-value="0"> <generator class="hilo"/> </id> I ran a test to save 100 objects. The IDs in my table went from 32768 - 32868. The next hi value was incremented to 2. Then I ran my test again and the Ids were in the range 65536 - 65636. First off, why start at 32768 and not 1, and secondly why the jump from 32868 to 65536? Now I know that my surrogate keys shouldn't have any meaning but we do use them in our application. Why can't I just have them increment nicely like a SQL Server identity field would. Finally can someone give me an explanation of how the max_lo parameter works? Is this the maximum number of low values (entity ids in my head) that can be created against the high value? This is one topic in NHibernate that I have struggled to find documentation for. I read the entire NHibernate in action book and it still doesn't go into how this works in any detail. Thanks Ben

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  • Can LINQ-to-SQL omit unspecified columns on insert so a database default value is used?

    - by Todd Ropog
    I have a non-nullable database column which has a default value set. When inserting a row, sometimes a value is specified for the column, sometimes one is not. This works fine in TSQL when the column is omitted. For example, given the following table: CREATE TABLE [dbo].[Table1]( [id] [int] IDENTITY(1,1) NOT NULL, [col1] [nvarchar](50) NOT NULL, [col2] [nvarchar](50) NULL, CONSTRAINT [PK_Table1] PRIMARY KEY CLUSTERED ([id] ASC) ) GO ALTER TABLE [dbo].[Table1] ADD CONSTRAINT [DF_Table1_col1] DEFAULT ('DB default') FOR [col1] The following two statements will work: INSERT INTO Table1 (col1, col2) VALUES ('test value', '') INSERT INTO Table1 (col2) VALUES ('') In the second statement, the default value is used for col1. The problem I have is when using LINQ-to-SQL (L2S) with a table like this. I want to produce the same behavior, but I can't figure out how to make L2S do that. I want to be able to run the following code and have the first row get the value I specify and the second row get the default value from the database: var context = new DataClasses1DataContext(); var row1 = new Table1 { col1 = "test value", col2 = "" }; context.Table1s.InsertOnSubmit(row1); context.SubmitChanges(); var row2 = new Table1 { col2 = "" }; context.Table1s.InsertOnSubmit(row2); context.SubmitChanges(); If the Auto Generated Value property of col1 is False, the first row is created as desired, but the second row fails with a null error on col1. If Auto Generated Value is True, both rows are created with the default value from the database. I've tried various combinations of Auto Generated Value, Auto-Sync and Nullable, but nothing I've tried gives the behavior I want. L2S does not omit the column from the insert statement when no value is specified. Instead it does something like this: INSERT INTO Table1 (col1, col2) VALUES (null, '') ...which of course causes a null error on col1. Is there some way to get L2S to omit a column from the insert statement if no value is given? Or is there some other way to get the behavior I want? I need the default value at the database level because not all row inserts are done via L2S, and in some cases the default value is a little more complex than a hard coded value (e.g. creating the default based on another field) so I'd rather avoid duplicating that logic.

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  • C# - Winforms webBrowser

    - by user335932
    How can i pass the URL property in web browser into an if statement.... private void button2_Click(object sender, EventArgs e) { var GameStats = comboBox1.Text; if (GameStats == "BattleField: Bad Company 2") { //Make URL equal to http://statsverse.com/ } }

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  • A question about Scala Objects

    - by Randin
    In the example for coding with Json using Databinder Dispatch Nathan uses an Object (Http) without a method, shown here: import dispatch._ import Http._ Http("http://www.fox.com/dollhouse/" >>> System.out ) How is he doing this?

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  • NSZombieEnabled breaking working code?

    - by Gordon Fontenot
    I have the following method in UIImageManipulation.m: +(UIImage *)scaleImage:(UIImage *)source toSize:(CGSize)size { UIImage *scaledImage = nil; if (source != nil) { UIGraphicsBeginImageContext(size); [source drawInRect:CGRectMake(0, 0, size.width, size.height)]; scaledImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); } return scaledImage; } I am calling it in a different view with: imageFromFile = [UIImageManipulator scaleImage:imageFromFile toSize:imageView.frame.size]; (imageView is a UIImageView allocated earlier) This is working great in my code. I resizes the image perfectly, and throws zero errors. I also don't have anything pop up under build - analyze. But the second I turn on NSZombieEnabled to debug a different EXC_BAD_ACCESS issue, the code breaks. Every single time. I can turn NSZombieEnabled off, code runs great. I turn it on, and boom. Broken. I comment out the call, and it works again. Every single time, it gives me an error in the console: -[UIImage release]: message sent to deallocated instance 0x3b1d600. This error doesn't appear if `NSZombieEnabled is turned off. Any ideas? --EDIT-- Ok, This is killing me. I have stuck breakpoints everywhere I can, and I still cannot get a hold of this thing. Here is the full code when I call the scaleImage method: -(void)setupImageButton { UIImage *imageFromFile; if (object.imageAttribute == nil) { imageFromFile = [UIImage imageNamed:@"no-image.png"]; } else { imageFromFile = object.imageAttribute; } UIImage *scaledImage = [UIImageManipulator scaleImage:imageFromFile toSize:imageButton.frame.size]; UIImage *roundedImage = [UIImageManipulator makeRoundCornerImage:scaledImage :10 :10 withBorder:YES]; [imageButton setBackgroundImage:roundedImage forState:UIControlStateNormal]; } The other UIImageManipulator method (makeRoundCornerImage) shouldn't be causing the error, but just in case I'm overlooking something, I threw the entire file up on github here. It's something about this method though. Has to be. If I comment it out, it works great. If I leave it in, Error. But it doesn't throw errors with NSZombieEnabled turned off ever.

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  • Java - JSON Null Exception

    - by user1112111
    Hi, I'm using JSON to deserialize an input string that contains a null value for certain hashmap property. Does anyone have any clue why this exception occurs ? Is it possible that null is not accepted as a value Is this configurable somehow ? input sample: {"prop1":"val1", "prop2":123, "prop3":null} stacktrace: net.sf.json.JSONException: null object at net.sf.json.JSONObject.verifyIsNull(JSONObject.java:2856) at net.sf.json.JSONObject.isEmpty(JSONObject.java:2212) Thanks.

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  • Python regex compile (with re.VERBOSE) not working

    - by bfloriang
    I'm trying to put comments in when compiling a regex but when using the re.VERBOSE flag I get no matchresult anymore. (using Python 3.3.0) Before: regex = re.compile(r"Duke wann", re.IGNORECASE) print(regex.search("He is called: Duke WAnn.").group()) Output: Duke WAnn After: regex = re.compile(r''' Duke # First name Wann #Last Name ''', re.VERBOSE | re.IGNORECASE) print(regex.search("He is called: Duke WAnn.").group())` Output: AttributeError: 'NoneType' object has no attribute 'group'

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  • How do I add a condition to all ActiveRecords Queries for a particular model?

    - by Kyle West
    I am using the sentient_user gem to have access to the current_user object in my application. I want to override the default ActiveRecordBase queries to scope them to the current user. For instance, I don't want my users looking at, deleting, modifying other user's orders. I feel like I should be able to override a single (or couple) ActiveRecordBase methods to accomplish this, but I don't know which or how. Thanks in advance.

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  • How do you hyperlink to Word 2007 help pages?

    - by Jeremy Rudd
    I want to hyperlink to a page within the Word 2007 Object Model Reference documentation, that ships with Word 2007. These are webpages that use the ms-help:// protocol that Firefox cannot understand. So I wanted to specify the ms-help:// path of the help page as a command line argument to the viewer, CLVIEW.EXE. C:\Program Files\Microsoft Office\Office12\CLVIEW.EXE Anybody know the command line syntax for this?

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  • How do you hyperlink to Word 2007 help pages?

    - by Jeremy Rudd
    I want to hyperlink to a page within the Word 2007 Object Model Reference documentation, that ships with Word 2007. These are webpages that use the ms-help:// protocol that Firefox cannot understand. So I wanted to specify the ms-help:// path of the help page as a command line argument to the viewer, CLVIEW.EXE. C:\Program Files\Microsoft Office\Office12\CLVIEW.EXE Anybody know the command line syntax for this?

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  • jquery prepend to textarea text()

    - by synapz
    I have a text area. I can set the text of it with $("#mytextarea").text("foo") I can prepend to the text area like this: $("#mytextarea").prepend("foo") But I cannot prepend to the jquery text() object like this: $("#mytextarea").text().prepend("foo") The reason I want to do this is so that if my user gets me to prepend this text: $("#mytextarea").prepend("<script>alert('lol i haxed uuu!')</script>") ...the script executes and I lose. Help?

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  • How to include a PHP generated XML file into flash vars, while ALSO passing through the current php functions into it?

    - by Sam
    Hello Given situation: In webpage.php the flashscript is calling a flash script with a flashvar: the playlist file which is a PHP generated XML file: playlist.php, it does that well so long as there are no extra functions in there. Now, in that XML-format playlistfile there needs to be a special function, besides the usual echo("");, namely the very special echo __(""); function that is already declared in webpage.php which needs to do something with the paragraphs residing within that xml file. However, currently the retrieved file misses the function echo __();and says "no such function declared in that xml-format [playlist.php] file". The php functions that are currently included at the very top of webpage.php somehow do not pass-through-the necessary functions into the playlist file for it to recognise how to handle it, in order for that playlist to get those necessary functions working. Apparently these are not passed through automatically/properly when residing in the flashvars?? Cause the echo __(""); works fine when called within webpage.php or via a normal php include(""); if those functions are in a different php file. But not working from the playlist.php file. Any ideas why/what is going on here? I appreciate your clues for this prob +1. Thanks very much. WEBPAGE.PHP the webpage, has at the top an include with functions: <?php include (functions.php); ?> // function that know what to do with echo __("paragraph") <script language="JavaScript" type="text/javascript"> run( 'play', 'true', 'loop', 'true', 'flashvars', 'xmlFile=/incl/playlist.php', // <<<< !! 'wmode', 'transparent', 'allowScriptAccess','sameDomain', ); </script> <noscript> <object classid="blabla"> <param name="allowScriptAccess" value="sameDomain" /> <param name="movie" value="/movies/movie.swf" /> <param name="flashvars" value="xmlFile=/incl/playlist.php" /> // <<< !! <embed src="/movies/movies.swf" type="application/x-shockwave-flash"/> </object> </noscript> PLAYLIST.PHP The PHP generated XML file which is retrieved into the webpage as flash variable (see above) <?php echo ('<?xml version="1.0" encoding="UTF-8"?>'); echo ('<songs>'); echo ('<song version="1. "') . __("boom blue blow bell bowl") . ('/>'); echo ('<song version="2. "') . __("ball bail beam bike base") . ('/>'); echo ('</songs>'); ?>

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  • Reading xml within xml as String in flex/AS3

    - by duder
    I'm getting XML input that looks like this <?xml version="1.0" encoding="utf-8"?> <data1>this is data 1</data1> <data2>this is data 2</data2> <data3> <3a>this is data 3a</3a> <3b>this is data 3b</3b> <3c> <TextFlow xmlns="http://ns.adobe.com/textLayout/2008"> <p direction="ltr" > <span>some text</span> <span>some additional text</span> </p> <p direction="ltr"> <span>some text</span> <span>some additional text</span> </p> </TextFlow> </3c> </data3> I can read <data1> with event.result.data1 which outputs a string this is data1 But when I do the same thing to event.result.data3.3c, it prints object [object] so I guess it's trying to dig deeper into the tree. But I need the actual string text (not xml tree) starting from and including <TextFlow></TextFlow> to be stored and printed as a string. Any idea what's the syntax for this? The string I'm looking for would look like this: <TextFlow xmlns="http://ns.adobe.com/textLayout/2008"> <p direction="ltr" > <span>some text</span> <span>some additional text</span> </p> <p direction="ltr"> <span>some text</span> <span>some additional text</span> </p> </TextFlow>

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  • Ruby 'if' condition in rjs

    - by ash34
    Hi, I want to insert a user in the userlist only if the user object (@row) is not nil. How do I do the insert conditionally in an rjs template? page.insert_html :bottom, :userlist, render(:partial = "user", :locals = { :user = @row, :myid = @row.id }) thanks much.

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  • Hosting Microsoft Office application inside Silverlight 4?

    - by Ivan Zlatanov
    I know that Silverlight 4 has the support for COM interop via the AutomationFactory class. dynamic excel = AutomationFactory.CreateObject( "Excel.Application" ); excel.Visible = true; Easy. But this creates a separate process for the COM object. What I am missing here is if I am actually able to actually host the office document inside my silverlight application - in a ContentPresenter for example? Thanks in advance.

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  • GetHashCode on null fields?

    - by Shimmy
    How do I deal with null fields in GetHashCode function? Module Module1 Sub Main() Dim c As New Contact Dim hash = c.GetHashCode End Sub Public Class Contact : Implements IEquatable(Of Contact) Public Name As String Public Address As String Public Overloads Function Equals(ByVal other As Contact) As Boolean _ Implements System.IEquatable(Of Contact).Equals Return Name = other.Name AndAlso Address = other.Address End Function Public Overrides Function Equals(ByVal obj As Object) As Boolean If ReferenceEquals(Me, obj) Then Return True If TypeOf obj Is Contact Then Return Equals(DirectCast(obj, Contact)) Else Return False End If End Function Public Overrides Function GetHashCode() As Integer Return Name.GetHashCode Xor Address.GetHashCode End Function End Class End Module

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  • googletest and EXPECT_THROW weirdness

    - by thumper
    I have a class that has no default constructor, but the construct may throw. I was wanting to have a test like: EXPECT_THROW(MyClass(param), std::runtime_error); But the compiler, g++, complains that there is no default constructor for Myclass. However the following: EXPECT_THROW(MyClass foo(param), std::runtime_error); Works, and the test passes as expected. Why though won't googletest accept the temporary object?

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  • pexpect install problem

    - by ddd
    i have installed pexpect with the following command "python setup.py install" but when i try to run a program it says "AttributeError: 'module' object has no attribute 'spawn'". how to settle the matter?

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  • Using web view behind a proxy (cocoa)

    - by Cal S
    Hi, I'm creating a web-browser type app (using a web view object) that needs to be able to connect to the internet via a proxy. Server, port, username and password can all be hardcoded into the app but unfortunately I have no idea how to customise the proxy settings of a web view without changing the system wide proxy settings. If you know how to do this please provide some example code, thanks a lot! (Also, if it changes anything - I'm developing for mac, not iPhone)

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  • Upload a file with POST (multipart/form-data) using VBA

    - by Moses Ting
    Does anyone know if it's possible to upload a file via POST body (multipart/form-data) using VBA? I'm currently using the Microsoft.XMLHTTP object, but I'm not tied to it if that doesn't support multipart POST. Here's what I'm doing so far: Set oHttp = CreateObject("Microsoft.XMLHTTP") oHttp.Open "POST", theUrl, False oHttp.setRequestHeader "Content-Type", "application/x-www-form-urlencoded" oHttp.Send "body=thebody"

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