大约有 15,600 项符合查询结果（耗时：0.0248秒） [XML]
Index on multiple columns in Ruby on Rails
...
Both. validates_uniqueness_of can be used to display an error message gracefully in the application for example when a form gets saved. Database constraint would make sure you don't end up with dup records even know you had validation specified in the model. Plus, you can rescue t...
MySQL join with where clause
...
If I'm still getting the same error using this code, what do I look for next.
– Jack Franzen
Jun 11 '15 at 9:56
add a comment
...
looping through an NSMutableDictionary
...nary), especially on a mutable dictionary, since the latter throws a nasty error if the dictionary is modified while being enumerated.
– sigsegv
Oct 12 '10 at 13:56
...
Relative paths in Python
...
When I run this in windows, I recieve an error: FileNotFoundError: [Errno 2] No such file or directory: '<path>' where <path> has the correct path segments but uses \\ for separators.
– lonstar
Jul 24 '19 at 5:09
...
Building big, immutable objects without using constructors having long parameter lists
...
I believe the common error he's referring to is that people add the "withXXX" (etc) methods to the Foo object, rather than having a separate FooFactory.
– Dean Harding
May 18 '10 at 0:57
...
Immutable class?
...resource to look at. The benefits that are mentioned range right from less error prone code to thread safety.
– gpampara
Jul 2 '10 at 5:37
...
Exception NoClassDefFoundError for CacheProvider
...
A really simple problem that will cause the same error is simply to have a mismatch between the hibernate version in the pom (4.something) and the version specified in the spring config.
share
...
Rsync copy directory contents but not directory itself
...t odd that the -a option was needed. If I don't use '-a' then I'll get an error skipping the directory and nothing happens. Reading the man pages, I wouldn't have concluded that. It seems like based on the docs that it should work without the -a option and the -v option is only for verbosity so t...
Break or return from Java 8 stream forEach?
...l conditions'. Furthermore 'Use runtime exceptions to indicate programming errors'. In definitive, I strongly encourage anyone considering this solution to look into @Jesper solution.
– Louis F.
May 30 '16 at 15:48
...
What can you do in MSIL that you cannot do in C# or VB.NET? [closed]
...t compile but doesn't execute (TypeLoadException). PEVerify returns: [MD]: Error: TypeDef that is not an Interface and not the Object class extends Nil token.
– xanatos
Apr 2 '15 at 8:52
...