大约有 45,297 项符合查询结果（耗时：0.0430秒） [XML]
How can I rename a database column in a Ruby on Rails migration?
...FixColumnName
# creates db/migrate/xxxxxxxxxx_fix_column_name.rb
Then edit the migration to do your will:
# db/migrate/xxxxxxxxxx_fix_column_name.rb
class FixColumnName < ActiveRecord::Migration
def self.up
rename_column :table_name, :old_column, :new_column
end
def self.down
#...
Using global variables between files?
I'm bit confused about how the global variables work. I have a large project, with around 50 files, and I need to define global variables for all those files.
...
How do I check if a column is empty or null in MySQL?
...follow
|
edited Mar 13 '14 at 22:36
answered Dec 12 '11 at 6:54
...
What are WSGI and CGI in plain English?
Every time I read either WSGI or CGI I cringe. I've tried reading on it before but nothing really has stuck.
4 Answers
...
Can not connect to local PostgreSQL
...x domain sockets are files and have user permissions just like any other. It looks as though the OSX user attempting to access the database does not have file permissions to access the socket file. To confirm this I've done some tests on Ubuntu and psql to try to generate the same error (included ...
jQuery Event Keypress: Which key was pressed?
With jQuery, how do I find out which key was pressed when I bind to the keypress event?
24 Answers
...
Limit results in jQuery UI Autocomplete
...mentation for the jQueryUI widget. There isn't a built-in parameter for limiting max results, but you can accomplish it easily:
$("#auto").autocomplete({
source: function(request, response) {
var results = $.ui.autocomplete.filter(myarray, request.term);
response(results.slice(...
Difference between / and /* in servlet mapping url pattern
...uch as the default servlet and the JSP servlet. Whatever request you fire, it will end up in that servlet. This is thus a bad URL pattern for servlets. Usually, you'd like to use /* on a Filter only. It is able to let the request continue to any of the servlets listening on a more specific URL patte...
Viewing unpushed Git commits
How can I view any local commits I've made, that haven't yet been pushed to the remote repository? Occasionally, git status will print out that my branch is X commits ahead of origin/master , but not always.
...
Run git pull over all subdirectories [duplicate]
How can I update multiple git repositories from their shared parent's directory without cd 'ing into each repo's root directory? I have the following which are all separate git repositories ( not submodules):
...