data-transfer | 易学教程

Remote Linux server to remote linux server dir copy. How? [closed]

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What is the best way to copy a directory (with sub-dirs and files) from one remote Linux server to another remote Linux server? I have connected to both using SSH client (like Putty). I have root access to both. There are two ways I usually do this, both use ssh: scp -r sourcedir/ user@dest.com:/dest/dir/ or, the more robust and faster (in terms of transfer speed) method: rsync -auv -e ssh --progress sourcedir/ user@dest.com:/dest/dir/ Read the man pages for each command if you want more details about how they work. I would modify a previously suggested reply: rsync -avlzp /path/to/sfolder

Ad Hoc Wifi Connection Between iPhone & Mac - Possible?

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I was just wondering if it is possible to set up a data transfer tunnel between an iPhone and a Mac using the Wifi hardware present on both devices? My main objective is to transfer data from my iPhone to my Mac through an app along an ad hoc wifi connection. If there are any other methods you would like to suggest, then please do. Looking forward to your replies. Thanks! A.K. You can make use of Bonjour, via NSNetServices and CFNetServices APIs. Basically: Create a server on the Mac Announce the server via Bonjour Browse Bonjour on the phone and resolve the bonjour service. Establish

Is endian conversion required for wchar_t data?

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问题 In C/C++, if a multi-byte wide character (wchar_t) value is transmitted from a big-endian system to a little-endian system (or vice-versa), will it come out the same value on the other side? Or will the bytes need to be swapped? 回答1: Yes you will need to swap them. The bytes will be retrieved from the transport in the same order they were put in. Just at the other end the ordering of these bytes has a different meaning. So you need to convert them to the correct endian-ness (is that a word?).

MySQL: SELECT from another server

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I'm afraid that I already know the answer to my question, but I'll ask it anyway: When there are two MySQL DB servers, can I access data that is stored on the other server? In other words: Can I somehow do this: INSERT INTO table (x, y, z) SELECT x, y, x+y FROM [otherserver].[database].[table] Is the answer really as short as "No"? volatilsis You can set up federated tables in MySQL to accomplish what you're trying to do. There are some limitations. http://dev.mysql.com/doc/refman/en/federated-storage-engine.html http://dev.mysql.com/doc/refman/en/federated-usagenotes.html CREATE TABLE `remote

When should I use transactions in my queries?

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问题 I'm reading very detailed tutorials on how to use transactions with database types and database engines, but I haven't found a guide that teaches me when and why I should use them. I know transactions are usually used for banking, so when we work with money data, but I can imagine they are used in many other ways. Today I'm working on a page with various INSERT statements for a relational database, and I wanted to know if this is one of the cases when I should use them. I get an impression

Javascript string comparison fails when comparing unicode characters

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I want to compare two strings in JavaScript that are the same, and yet the equality operator == returns false. One string contains a special character (eg. the danish å ). JavaScript code: var filenameFromJS = "Designhåndbog.pdf"; var filenameFromServer = "Designhåndbog.pdf"; print(filenameFromJS == filenameFromServer); // This prints false why? The solution What worked for me is unicode normalization as slevithan pointed out. I forked my original jsfiddle to make a version using the normalization lib suggested by slevithan. Link: http://jsfiddle.net/GWZ8j/1/ . Unlike what some other people

MySQL: SELECT from another server

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问题 I'm afraid that I already know the answer to my question, but I'll ask it anyway: When there are two MySQL DB servers, can I access data that is stored on the other server? In other words: Can I somehow do this: INSERT INTO table (x, y, z) SELECT x, y, x+y FROM [otherserver].[database].[table] Is the answer really as short as "No"? 回答1: You can set up federated tables in MySQL to accomplish what you're trying to do. There are some limitations. http://dev.mysql.com/doc/refman/en/federated

Javascript string comparison fails when comparing unicode characters

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问题 I want to compare two strings in JavaScript that are the same, and yet the equality operator == returns false. One string contains a special character (eg. the danish å ). JavaScript code: var filenameFromJS = \"Designhåndbog.pdf\"; var filenameFromServer = \"Designhåndbog.pdf\"; print(filenameFromJS == filenameFromServer); // This prints false why? The solution What worked for me is unicode normalization as slevithan pointed out. I forked my original jsfiddle to make a version using the

What is Data Transfer Object?

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问题 What is a Data Transfer Object? In MVC are the model classes DTO, and if not what are the differences and do we need both? 回答1: A Data Transfer Object is an object that is used to encapsulate data, and send it from one subsystem of an application to another. DTOs are most commonly used by the Services layer in an N-Tier application to transfer data between itself and the UI layer. The main benefit here is that it reduces the amount of data that needs to be sent across the wire in distributed