大约有 43,000 项符合查询结果（耗时：0.0390秒） [XML]
Why is SELECT * considered harmful?
...ould a consumer know which was which? SELECT * can also confuse views (at least in some versions SQL Server) when underlying table structures change -- the view is not rebuilt, and the data which comes back can be nonsense. And the worst part of it is that you can take care to name your columns wh...
java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener
...
You have to use at least version 3.2.8.RELEASE of spring-core.
For Maven, set in your pom.xml:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>...
Leading zeros for Int in Swift
...ng Playground code shows how to create a String formatted from Int with at least two integer digits by using init(format:_:):
import Foundation
let string0 = String(format: "%02d", 0) // returns "00"
let string1 = String(format: "%02d", 1) // returns "01"
let string2 = String(format: "%02d", 10) /...
Using an RDBMS as event sourcing storage
...BoringCoder It sounds like you have Event Sourcing and CQRS confused or at least mashed up in your head. They are frequently found together but they are not the same thing. CQRS has you separate your read and write models while Event Sourcing has you use an event stream as the single source of truth...
Why is “except: pass” a bad programming practice?
...nly catch those exceptions you are prepared for. Some people suggest to at least catch Exception as it won’t include things like SystemExit and KeyboardInterrupt which by design are to terminate your application, but I would argue that this is still far too unspecific. There is only one place wher...
Undefined reference to static class member
Can anyone explain why following code won't compile? At least on g++ 4.2.4.
7 Answers
...
Creating default object from empty value in PHP?
...ing for PHP versions <= 5.3.x, or simply have error_reporting set to at least E_WARNING with PHP versions >= 5.4. That error is triggered when $res is NULL or not yet initialized:
$res = NULL;
$res->success = false; // Warning: Creating default object from empty value
PHP will report a d...
Why would one use nested classes in C++?
... popularized by Herb Sutter. Don't use auto_ptr on incomplete types, or at least take precautions to avoid wrong code being generated.
– Gene Bushuyev
Dec 31 '10 at 20:00
...
Java: Check if enum contains a given string?
...ing thrown to find actual exceptional cases that are being retried. (or at least makes it very annoying to do so). Use exceptions for exceptional cases.
– Nickolay Kondratyev
Jan 29 '16 at 0:08
...
UIImagePickerController error: Snapshotting a view that has not been rendered results in an empty sn
...ndered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.
showsCameraControls property
The problem occurs for me when this has a value of YES (the default).
Setting this to NO eliminated the message.
Bug report
I ...