大约有 45,000 项符合查询结果（耗时：0.0449秒） [XML]
Why aren't pointers initialized with NULL by default?
...he highest level possible. Then tell the compiler to treat all warnings as errors. Under these conditions most compilers will then generate an error for variables that are un-initialized but used and thus will prevent code from being generated.
...
PDO closing connection
...r a number of other reasons. When connecting or running a query, catch any error, and if it is "MySQL has gone away", attempt to connect again or run the query a second time.
– Frank Forte
Dec 14 '17 at 20:50
...
How do you disable the unused variable warnings coming out of gcc in 3rd party code I do not wish to
...ass to the gcc compiler to turn off unused variable warnings? I'm getting errors out of boost on windows and I do not want to touch the boost code:
...
Is there a Max function in SQL Server that takes two values like Math.Max in .NET?
...hen obtaining the MAX of 4 values the CASE clauses become long, clumsy and error prone if hand-generated while the VALUES clause remains simple and clear.
– Typhlosaurus
Jun 16 '14 at 15:05
...
How do you stop Console from popping up automatically in Eclipse
I have a web application running in Eclipse with Tomcat. It has a few errors that make the console popup every few seconds. How do I stop it from automatically popping up and taking focus?
...
What's the Android ADB shell “dumpsys” tool and what are its benefits?
...e machine app is crashed or not.
dumpsys | grep myapp | grep "Application Error"
or
adb shell dumpsys | grep myapp | grep Error
or anything that helps...etc
if app is not running you will get nothing as result.
When app is stoped messsage is shown on screen by android, process is still activ...
What are the differences in die() and exit() in PHP?
... Even though they do the same thing, I usually reserve die for error related stops and exit for all other scenarios. It just seems to flow better when reading the code.
– nextgentech
Jan 11 '14 at 4:29
...
Postgresql - change the size of a varchar column to lower length
...ng a bigger size (30 > 10). If the size is smaller, you'll get the same error than I had.
– Matthieu
Nov 25 '15 at 11:31
...
Will using 'var' affect performance?
...e it can't figure out what type you intended to use, you'll get a compiler error.
The only trick is that var will infer an exact type where you may have chosen an Interface or parent type if you were to set the type manually.
Update 8 Years Later
I need to update this as my understanding has change...
must appear in the GROUP BY clause or be used in an aggregate function
...pain is 5 and for canada the best result is 2. It is true, and there is no error.
If we need to display wmname also, we have to answer the question: "What is the RULE to choose wmname from resulting set?" Let's change the input data a bit to clarify the mistake:
cname | wmname | avg ...