大约有 1,360 项符合查询结果（耗时：0.0203秒） [XML]
Common programming mistakes for Clojure developers to avoid [closed]
...s, temporarily having forgotten what it is I was printing. Funny, why's my PC all hung up?
trying to program Clojure imperatively.
There is some temptation to create a whole lot of refs or atoms and write code that constantly mucks with their state. This can be done, but it's not a good fit. It ma...
What is the proper way to re-attach detached objects in Hibernate?
...lready associated with the session : [com.vladmihalcea.book.hpjp.hibernate.pc.Book#1]
at org.hibernate.engine.internal.StatefulPersistenceContext.checkUniqueness(StatefulPersistenceContext.java:651)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrU...
What are the use cases for selecting CHAR over VARCHAR in SQL?
...ld also mean the time it takes to get the data from the server to my local pc or to another computer or wherever it is going to be consumed.
But there is some overhead in using varchar. SQL Server has to use a two byte indicator (overhead) to, on each row, to know how many bytes that particular ro...
What is the difference between Google App Engine and Google Compute Engine?
...ween GAE Standard and GAE Flex):
Compute Engine is analogous to a virtual PC, where you'd deploy a small website + database, for instance. You manage everything, including control of installed disk drives. If you deploy a website, you're in charge of setting up DNS etc.
Google App Engine (Standard...
What should I use Android AccountManager for?
...can access protected material at the same time in their android device and PC without the need for recurrent logins.
From the security point of view, using the same password in every request to the server allows for possible eavesdropping in non-secure connections. Password encryption is not suffici...
Why doesn't c++ have &&= or ||= for booleans?
..._cast<bool*>(&i);
b |= true; // MAY yield 3 (but doesn’t on my PC!)
But since this code results in undefined behaviour anyway, we may safely ignore this potential problem in conforming C++ code.
1 Admittedly this is a rather big caveat as Angew’s comment illustrates:
bool b = tru...
How to add a local repo and treat it as a remote repo
...ocal repo act as a remote with the name bak for another local repo on my PC, using the following:
4 Answers
...
Send email using java
...r for sending mails. There are servers you can install locally on your own pc, or you can use one of the many online servers. One of the more known servers is Google's:
I just successfully tested the allowed Google SMTP configurations using the first example from Simple Java Mail:
final Email ...
List of Delphi language features and version in which they were introduced/deprecated
...een added:
ALIGN_STACK
CPUX86
CPUX64
MACOS (Mac operating system)
MACOS32
PC_MAPPED_EXCEPTIONS
PIC
WIN64
Full unit scope names are now required in your uses clause.
{$ExcessPrecision on/off} compiler directive (x64 only)
The build-in types differ depending on the target platform (32/64-bit)
Ex...
How do cache lines work?
...he largest address below the one you need that is multiple of 64).
Modern PC memory modules transfer 64 bits (8 bytes) at a time, in a burst of eight transfers, so one command triggers a read or write of a full cache line from memory. (DDR1/2/3/4 SDRAM burst transfer size is configurable up to 64B...