default

问题 Is there ANY difference between those two statements?: INSERT INTO distributors (did, dname) VALUES (DEFAULT, 'XYZ Widgets'); and: INSERT INTO distributors (dname) VALUES ('XYZ Widgets'); I mean is there at least one reason to use one or another pattern in some particular situation or is it completely the same? did is a serial column. 回答1: It's exactly the same thing. No need to pick one instead of the other. Usually default keyword is handy when you have computer-generated code. It makes

问题 I have a JFrame with three JButtons on it. I have set txtSearch (a JTextField component) to have the focus when JFrame loads. One of the buttons is set as the default button. This is my code: private void formWindowOpened(java.awt.event.WindowEvent evt) { // btnRefresh.setMnemonic(KeyEvent.VK_R); // Even if this line // is not commented, but // still the event wouldn't fire. this.getRootPane().setDefaultButton(btnRefresh); } When it loads, the button is just selected, but it did nothing when

问题 to simplify my daily R interactions, I'd like to set up default colors for all my plots. For example, let's say I want to have all plots made with red lines (like in gnuplot...:-) ) So far, here is a snippet of my .Rprofile setHook(packageEvent("grDevices", "onLoad"), function(...) grDevices::X11.options(width = 14, height = 8, type = "Xlib", xpos = 600, ypos = 30, canvas = "grey87")) suppressPackageStartupMessages( require(Defaults) ) suppressPackageStartupMessages( require(utils) )

问题 So I've done some layouts that I want to use and I was thinking that setting this in your local.xml file would fix this for every page. Like this <default> <reference name="root"> <action method="setTemplate"> <template>page/mytheme.phtml</template> </action> </reference> </default> This however doesn't do anything. Instead if I go ...<customer_account_forgotpassword> <reference name="root"> <action method="setTemplate"><template>page/mytheme.phtml</template></action> </reference> </customer

问题 So I've done some layouts that I want to use and I was thinking that setting this in your local.xml file would fix this for every page. Like this <default> <reference name="root"> <action method="setTemplate"> <template>page/mytheme.phtml</template> </action> </reference> </default> This however doesn't do anything. Instead if I go ...<customer_account_forgotpassword> <reference name="root"> <action method="setTemplate"><template>page/mytheme.phtml</template></action> </reference> </customer

问题 I am trying to change the default port on my jboss server to port 80. i have had a look around the web and i have had suggestions of editing this file jboss5\server\default\deploy\jbossweb.sar\server.xml which is fine. changing this file alone still does not fix the issue. There have also been suggestion to also change this file: jboss5\server\default\conf\bootstrap\bindings.xml Only problem is that i cant find this binding.xml Is the binding.xml file a standard in JBoss 5? Or has it been

问题 I want to allow the default row movement in a UITableView without it being in editing mode, and without compromising the default behaviour of the UITableView . The image above displays a cell in editing mode, with movement enabled. I tried simply running for (UIView *subview in cell.subviews) (while my UITableView was in editing mode), but the button didn't turn up: <UITableViewCellScrollView: 0x8cabd80; frame = (0 0; 320 44); autoresize = W+H; gestureRecognizers = <NSArray: 0x8c9ba20>; layer

问题 I want to allow the default row movement in a UITableView without it being in editing mode, and without compromising the default behaviour of the UITableView . The image above displays a cell in editing mode, with movement enabled. I tried simply running for (UIView *subview in cell.subviews) (while my UITableView was in editing mode), but the button didn't turn up: <UITableViewCellScrollView: 0x8cabd80; frame = (0 0; 320 44); autoresize = W+H; gestureRecognizers = <NSArray: 0x8c9ba20>; layer

问题 Consider: struct A { A (int); A (const A &); }; struct B { A foo [2]; B (const A & x, const A & y) : foo {x, y} /* HERE IS THE PROBLEM */ {} }; I was expecting this to work since I'm using C++0x support in GCC4.3, which allegedly supports initialiser lists. No joy. I have a class A which has no default constructor. This is not negotiable. Assignment post-default is not an option. I am trying to create B which uses A. B::foo may not be std::vector. How can I initialise B::foo in B(...) ,

问题 Consider: struct A { A (int); A (const A &); }; struct B { A foo [2]; B (const A & x, const A & y) : foo {x, y} /* HERE IS THE PROBLEM */ {} }; I was expecting this to work since I'm using C++0x support in GCC4.3, which allegedly supports initialiser lists. No joy. I have a class A which has no default constructor. This is not negotiable. Assignment post-default is not an option. I am trying to create B which uses A. B::foo may not be std::vector. How can I initialise B::foo in B(...) ,