大约有 26,000 项符合查询结果（耗时：0.0629秒） [XML]
eclipse won't start - no java virtual machine was found
Eclipse was running fine yesterday (and has been since I installed it about a year ago). Now all the sudden I'm getting the following error on startup:
...
Deleting all records in a database table
How do I delete all records in one of my database tables in a Ruby on Rails app?
7 Answers
...
In Java, what is the best way to determine the size of an object?
I have an application that reads a CSV file with piles of data rows. I give the user a summary of the number of rows based on types of data, but I want to make sure that I don't read in too many rows of data and cause OutOfMemoryError s. Each row translates into an object. Is there an easy way t...
How do I enable EF migrations for multiple contexts to separate databases?
... do I enable Entity Framework 5 (version 5.0.0) migrations for multiple DB contexts in the same project, where each context corresponds to its own database? When I run Enable-Migrations in the PM console (Visual Studio 2012), there's an error because of there being multiple contexts:
...
grep using a character vector with multiple patterns
I am trying to use grep to test whether a vector of strings are present in an another vector or not, and to output the values that are present (the matching patterns).
...
Directory-tree listing in Python
How do I get a list of all files (and directories) in a given directory in Python?
20 Answers
...
Should we pass a shared_ptr by reference or by value?
When a function takes a shared_ptr (from boost or C++11 STL), are you passing it:
10 Answers
...
CSS Child vs Descendant selectors
I am a bit confused between these 2 selectors.
8 Answers
8
...