大约有 6,100 项符合查询结果（耗时：0.0197秒） [XML]
Adding :default => true to boolean in existing Rails column
...ribute == nil ? true : false)) }
Update the migration that created this table, so any future builds of the DB will get it right from the onset. Also run the same process on any deployed-instances of the DB.
If using the "new db migration" method, you can do the update of existing nil-values i...
JPA: unidirectional many-to-one and cascading delete
...y parent's collection.
Or, specify the foreign key constraint in the child table as ON DELETE CASCADE. You'll need to invoke EntityManager.clear() after calling EntityManager.remove(parent) as the persistence context needs to be refreshed - the child entities are not supposed to exist in the persist...
How to declare a variable in MySQL?
...ting a column value from calculations
...
SELECT count(*) INTO @NR FROM a_table WHERE a_condition;
SET NEW.ord_col = IFNULL( @NR, 0 ) + 1;
...
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API vs. Webservice [closed]
...k have a published Java API which allows users to interrogate the database tables to get information about their online advertising campaign.
e.g. call GetNumberClicks (user name)
To implement the API, you have to add the Doubleclick .jar file to your class path. The call is local.
A web service ...
How to list all Git tags?
...ects under that tag name.
I am working in Teradata and object means view, table etc
SQL Server Installation - What is the Installation Media Folder?
...
If you are using an executable,
just run the executable (for example: "en_sql_server_2012_express_edition_with_advanced_services_x64.exe")
Navigate to the "options" tab
Copy the "Installation Media Root Directory" (should look something like the b...
Python: json.loads returns items prefixing with 'u'
... is an appropriate type here. The JSONDecoder docs describe the conversion table and state that json string objects are decoded into Unicode objects
https://docs.python.org/2/library/json.html#encoders-and-decoders
JSON Python
==================================
object ...
Profiling Vim startup time
...ent directory with all required information. To get per-script information table similar to already present per-function one, use (after opening this file in vim):
" Open profile.log file in vim first
let timings=[]
g/^SCRIPT/call add(timings, [getline('.')[len('SCRIPT '):], ...
Difference between getContext() , getApplicationContext() , getBaseContext() and “this”
...ntext classes applicability in different situations.
Let me copy the main table from that post for completeness:
+----------------------------+-------------+----------+---------+-----------------+-------------------+
| | Application | Activity | Service | ContentProvide...
Lightweight XML Viewer that can handle large files [closed]
...useful as an editor, but it does a good job of displaying flat XML data as tables.
There are tons of free editors that do XML syntax highlighting, including vim, emacs, scite, eclipse (J2EE edition), jedit, notepad++.
For heavyweight XML features, like XPath support, XSLT editing and debugging, SO...