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Adding an object to a list and then having to explicitly save the object using the Save method is tedious. In some cases, you want this behavior. For example, imagine a scenario where the table references a set of constants. It would be very silly to add a new constant to the table whenever an association between two classes is made. In this example, where a comment is only associated with a single book, it isn t efficient. Using the attribute cascade, it s possible to have an object saved automatically, if it needs to be saved. Following is the slightly modified mapping configuration file for Book: <hibernate-mapping xmlns="urn:nhibernate-mapping-2.0"> <class name="Chap08.ObjectRelational.Book, Chap08.ObjectRelational" table="BOOKS"> <id name="ISBN" column="ISBN"> <generator class="assigned" /> </id> <property name="Title" /> <property name="Author" /> <bag name="Comments" cascade="all"> <key column="PARENT_ISBN" /> <one-to-many class="Chap08.ObjectRelational.Comment, Chap08.ObjectRelational" /> </bag> </class> </hibernate-mapping> The cascade attribute is associated with the XML tag bag. The attribute value of all indicates that all children of the object will be saved or updated. Another variation, all-delete-orphan, deletes all children when the parent is deleted. It would seem that all-delete-orphan isn t necessary because, by default, all children should be deleted. However, there are some situations in which you would want parent objects to be loaded and deleted without having deleted all of the children. The cascade attribute would seem like a life saver, but it s a double-edged sword. If a specific Book object instance is deleted, then all of the children will also be deleted. This can be useful when you want to maintain the consistency of the database, but could be problematic if by accident an object is deleted or if the children reference constants stored in another table. vb.net code 128 reader VB . NET Barcode Reader - How to Scan & Read Barcode in VB . NET ...
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18 packages returned for Tags:" Code - 128 ". Include prerelease ... NET barcode reader and generator SDK for developers. .... NET - Windows Forms VB Sample. { GtkWidget *window, *scrolled_win, *textview, *cut, *copy, *paste, *hbox, *vbox; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Cut, Copy & Paste"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); textview = gtk_text_view_new (); cut = gtk_button_new_from_stock (GTK_STOCK_CUT); copy = gtk_button_new_from_stock (GTK_STOCK_COPY); paste = gtk_button_new_from_stock (GTK_STOCK_PASTE); g_signal_connect (G_OBJECT (cut), "clicked", G_CALLBACK (cut_clicked), (gpointer) textview); g_signal_connect (G_OBJECT (copy), "clicked", G_CALLBACK (copy_clicked), (gpointer) textview); g_signal_connect (G_OBJECT (paste), "clicked", G_CALLBACK (paste_clicked), (gpointer) textview); scrolled_win = gtk_scrolled_window_new (NULL, NULL); gtk_widget_set_size_request (scrolled_win, 300, 200); gtk_container_add (GTK_CONTAINER (scrolled_win), textview); hbox = gtk_hbox_new (TRUE, 5); gtk_box_pack_start (GTK_BOX (hbox), cut, TRUE, TRUE, 0); gtk_box_pack_start (GTK_BOX (hbox), copy, TRUE, TRUE, 0); gtk_box_pack_start (GTK_BOX (hbox), paste, TRUE, TRUE, 0); vbox = gtk_vbox_new (FALSE, 5); gtk_box_pack_start (GTK_BOX (vbox), scrolled_win, TRUE, TRUE, 0); gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, TRUE, 0); gtk_container_add (GTK_CONTAINER (window), vbox); gtk_widget_show_all (window); gtk_main(); return 0; } asp.net pdf editor, asp.net qr code reader, c# export excel sheet to pdf, crystal report ean 13, javascript barcode scanner example, vb.net barcode scanner programming vb.net code 128 reader Code 128 VB . NET SDK - KeepAutomation.com
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Complete developer guide for Code 128 data encoding and generation in Visual Basic . NET applications using KA.Barcode for VB . NET . The GRANT command lets you assign privileges on an object to a role It uses the following syntax: GRANT chosen_privilege ON target_object TO target_role; where chosen_privilege is the option to be given The target_object can be a table, database or role for example The target_role is the role that will be affected by this GRANT command As an example, assume that you have a table called statues, which was created by the toymaster role Therefore only toymaster can make changes to the statues table There is another role, called supplier, that needs to view the contents of the table However, it is not able to do so because the table is owned by toymaster. vb.net code 128 reader Read Barcodes from Images C#/ VB . NET - BC.NetBarcodeReader ...
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Linear Code 128 barcode scanning on image in C# and VB . NET . Provide free sample code for decoding Code 128 from image file using C# & VB . NET demos. Thus far it would seem all is OK in the example book application, when in fact under the covers, so to speak, multiple things are happening. First, the addition of a comment into the relational database isn t a single SQL statement, but two. The first is an INSERT statement that adds a comment to the COMMENTS table. The second is an UPDATE statement that associates the comment with the book. The two SQL statements are problematic because when the INSERT statement is executed, the PARENT_ISBN value is null. A few sections ago when the COMMENTS table was defined, there was no NOT NULL constraint, which allowed the addition of the comment. In most database designs, though, the PARENT_ISBN will have a constraint in that the value can t be null. Trying to execute an INSERT without a value for PARENT_ISBN will result in a database constraint error. /* Copy the selected text to the clipboard and remove it from the buffer. */ static void cut_clicked (GtkButton *cut, GtkTextView *textview) { GtkClipboard *clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD); GtkTextBuffer *buffer = gtk_text_view_get_buffer (textview); gtk_text_buffer_cut_clipboard (buffer, clipboard, TRUE); } /* Copy the selected text to the clipboard. */ static void copy_clicked (GtkButton *copy, GtkTextView *textview) { GtkClipboard *clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD); GtkTextBuffer *buffer = gtk_text_view_get_buffer (textview); gtk_text_buffer_copy_clipboard (buffer, clipboard); } /* Insert the text from the clipboard into the text buffer. */ static void paste_clicked (GtkButton *paste, GtkTextView *textview) { GtkClipboard *clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD); GtkTextBuffer *buffer = gtk_text_view_get_buffer (textview); gtk_text_buffer_paste_clipboard (buffer, clipboard, NULL, TRUE); } GtkClipboard is a central class where data can be transferred easily between applications. To retrieve a clipboard that has already been created, you should use gtk_clipboard_get(). Since a default clipboard is provided, this book will not teach you how to create your own clipboard object. vb.net code 128 reader Reading Barcodes in C# & VB . Net Tutorial | Iron Barcode
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