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Search found 208 results on 9 pages for 'jian'.

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• Does any language (or debugging tool) have a build in function or method to print out the scope chai

  - by Jian Lin

  Does any language or debug tool have a way to print out the scope chain for examination? Thanks.

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• Do we need Record Level Locking when we already have Transaction for online ordering? (of concert ti

  - by Jian Lin

  For online ordering of concert seat or airline ticket, do we need Record Level Locking or is Transaction good enough? For concert ticket (say, seat Number 20B), or airline ticket (even with overbooking, the limit is 210, for example), I think the website cannot lock any record or begin transaction when showing the ticket purchase screen. But…

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• On Windows, can we put different folders in 1 SVN repository?

  - by Jian Lin

  On Windows, can we put different folders in 1 SVN repository? Such as putting c:\ror c:\software projects\ruby c:\js test d:\peter_website all in 1 SVN repository called code ?

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• What are some useful SQL statements / usage patterns that should be known by all developers who may

  - by Jian Lin

  What are some useful SQL statements that should be known by all developers who may touch the Back end side of the project? (Update: just like in algorithm, we know there are sorting problems, shuffling problems, and we know some solutions to them. This question is aiming at the same thing). For example, ones I can think of are: Get a list…

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• In SQL, we can use "Union" to merge two tables. What are different ways to do "Intersection"?

  - by Jian Lin

  In SQL, there is an operator to "Union" two tables. In an interview, I was told that, say one table has just 1 field with 1, 2, 7, 8 in it, and another table also has just 1 field with 2, and 7 in it, how do I get the intersection. I was stunned at first, because I never saw it that way. Later on, I found that it is actually a "Join" (inner…

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• In SQL, what does Group By mean without Count(*), or Sum(), Max(), avg(), ..., and what are some use

  - by Jian Lin

  In SQL, if we use Group By without Count(*) or Sum(), etc, then the result is as follows: mysql> select * from sentGifts; +--------+------------+--------+------+---------------------+--------+ | sentID | whenSent | fromID | toID | trytryWhen | giftID | +--------+------------+--------+------+---------------------+--------+ | …

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• How to change verbose code in Ruby to simpler code using Metaprogramming?

  - by Jian Lin

  It is said that Ruby is a metaprogramming language. I wonder if the first 3 lines can be made less verbose using metaprogramming? RUBY_VERSION ||= "unknown version" RUBY_PATCHLEVEL ||= "unknown patchlevel" RUBY_PLATFORM ||= "unknown platform" print "Ruby ", RUBY_VERSION, " patch ", RUBY_PATCHLEVEL, " on ", RUBY_PLATFORM

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• Is it good to commit files often if using Mercurial or Git?

  - by Jian Lin

  It seems that it is suggested we can commit often to keep track of intermediate changes of code we wrote… such as on hginit.com, when using Mercurial or Git. However, let's say if we work on a project, and we commit files often. Now for one reason or another, the manager wants part of the feature to go out, so we need to do a push, but I…

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• Using Mercurial (hg), can you just "hg backout" all the commits you did for the files you don't want

  - by Jian Lin

  Using Mercurial (hg), can you just "hg backout" all the commits you did for the files you don't want to push, and then do a push? Because Mercurial (or Git) won't let us push a single file or a single folder to another repository, so I am thinking: 1) How about, we just look at the commit we did, and hg backout the ones we don't want to…

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• Why TortoiseHg not show the "merge conflict"?

  - by Jian Lin

  Short version of the question: Since I already have TortoiseHg, I right clicked on that file trying to see the merge conflict visually, but there is no way to see it? Details: To make a simple case of merge conflict, I hg init a repo on Win 7, and then clone it to another folder. Now, in one working directory, i added the line "the…

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• nicely display file rename history in git log

  - by Jian

  The git command git log --format='%H' --follow -- foo.txt will give you the series of commits that touch foo.txt, following it across renames. I'm wondering if there's a git log command that will also print the corresponding historical file name beside each commit. It would be something like this, where we can interpret '%F' to…

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• In SQL / MySQL, what is the difference between "On" and "Where" in a join statement?

  - by Jian Lin

  The following statements give the same result (one is using "on", and the other using "where"): mysql> select * from gifts INNER JOIN sentGifts on gifts.giftID = sentGifts.giftID; mysql> select * from gifts INNER JOIN sentGifts where gifts.giftID = sentGifts.giftID; I can only see in a case of a Left Outer Join finding the…

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• on Rails, is f.submit in a form_for newer than submit_tag?

  - by Jian Lin

  some books or even the rails api uses form_for ... ... submit_tag ... end and i found that the Rails 2.3.2 Scaffold uses f.submit "Create" instead... and this is not in the rails api doc. Is this a new addition and is it suppose to replace submit_tag?

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• How to change verbose code in Ruby to simpler using Metaprogramming?

  - by Jian Lin

  It is said that Ruby is a metaprogramming language. I wonder if the first 3 lines can be made less verbose using metaprogramming? RUBY_VERSION ||= "unknown version" RUBY_PATCHLEVEL ||= "unknown patchlevel" RUBY_PLATFORM ||= "unknown platform" print "Ruby ", RUBY_VERSION, " patch ", RUBY_PATCHLEVEL, " on ", RUBY_PLATFORM

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• It is said that Mercurial's "hg clone" is very cheap... but it is 400MB on my hard drive? (on Mac OS

  - by Jian Lin

  I have a project I cloned over the network to the Mac hard drive (OS X Snow Leopard). The project is about 1GB in the hard drive du -s 2073848 . so when I hg clone proj proj2 then when I MacBook-Pro ~/development $ du -s proj 2073848 proj MacBook-Pro ~/development $ du -s proj2 894840 proj2 MacBook-Pro ~/development $ du…

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• Ruby on Rails server running in production mode still shows lots of error details?

  - by Jian Lin

  I thought I read that when a Ruby on Rails server is running in production mode, it won't say so much about an error (the details, showing the code)... but I just try to run the server using ruby script/server -e production and add a <%= x %> with the local variable x undefined. It showed a lot of error details including…

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• On Windows, can we put different folders in 1 Git or Mercurial (hg) repository?

  - by Jian Lin

  On Windows, can we put different folders in 1 Git or Mercurial (hg) repository? Such as putting c:\ror c:\software projects\ruby c:\js test all in 1 Git or Mercurial repository called code ?

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• In Ruby on Rails, why http://localhost:3000/foobars/alt/1.xml not work?

  - by Jian Lin

  In Ruby on Rails, http://localhost:3000/foobars/alt/1 works but http://localhost:3000/foobars/alt/1.xml doesn't work. config/route.rb is map.connect ':controller/:action/:id' map.connect ':controller/:action/:id.:format' so supposedly it supports an id.format in the URL?

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• How to change a primary key in SQL to auto_increment?

  - by Jian Lin

  I have a table in MySQL that has a primary key: mysql> desc gifts; +---------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +---------------+-------------+------+-----+---------+-------+ | giftID | int(11) | NO | PRI | NULL | | | name …

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• Why does FastCGI not work well with Ruby on Rails?

  - by Jian Lin

  It is said that FastCGI doesn't work well with Ruby on Rails deployment. Why is that? In previous experience, something either works quite well or it might be fundamentally wrong. So if FastCGI is a viable solution, why is it not reliable with RoR? Does FastCGI work well with most any language / frameworks?

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• Does any Version Control System like SVN, Git, or Mercurial let you "keep latest version" but not th

  - by Jian Lin

  In our project files, if there are binary files, such as .doc, .xls, .jpg, and we choose to not keep their past revisions (just keeping a latest version is ok), is there a way to tell SVN, Git, or Mercurial or some other tool to skip the revisions for these files or for a particular folder? Say, there is a 4MB .doc file that I…

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• What are some practical uses of generating all permutations of a list, such as ['a', 'b', 'c'] ?

  - by Jian Lin

  I was asked by somebody in an interview for web front end job, to write a function that generates all permutation of a string, such as "abc" (or consider it ['a', 'b', 'c']). so the expected result from the function, when given ['a', 'b', 'c'], is abc acb bac bca cab cba Actually in my past 20 years of career, I have never…

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• In MySQL, if the movies table has a description field, how to do search on this description?

  - by Jian Lin

  Say, using MySQL, if the movies table has 20,000 records, and each record has a field that is the description of the movie, up to 2k byte long. How can we search for movies with the word "nature" in its description? If possible, it is to be fast, instead of going through all the 20,000 records. (if in some other situations,…

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• How to create a function and pass in variable length argument list?

  - by Jian Lin

  We can create a function p in the following code: var p = function() { }; if (typeof(console) != 'undefined' && console.log) { p = function() { console.log(arguments); }; } but the arguments are passed like an array to console.log, instead of passed one by one as in console.log(arguments[0], arguments[1],…

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• TextMate can show definition of a function easily?

  - by Jian Lin

  I am using TextMate on a Ruby on Rails project and wonder if you can put the mouse on link_to, and then press a key and it will show the definition of link_to, or does this for any other helper functions? Or, click open a box and type in a function name and it will show you the definition?

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