大约有 40,700 项符合查询结果(耗时:0.0419秒) [XML]

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What Makes a Method Thread-safe? What are the rules?

...here are probably a million one-off situations, but what about in general? Is it this simple? 4 Answers ...
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What is output buffering?

What is output buffering and why is one using it in PHP? 7 Answers 7 ...
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What's this =! operator? [duplicate]

I was surprised by this code: 13 Answers 13 ...
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What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?

The "N+1 selects problem" is generally stated as a problem in Object-Relational mapping (ORM) discussions, and I understand that it has something to do with having to make a lot of database queries for something that seems simple in the object world. ...
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What is a WeakHashMap and when to use it? [duplicate]

What is a WeakHashMap and when should one be using it? What are the differences between a WeakHashMap and a HashMap ? ...
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Maximum packet size for a TCP connection

What is the maximum packet size for a TCP connection or how can I get the maximum packet size? 10 Answers ...
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How to check if a symlink exists

I'm trying to check if a symlink exists in bash. Here's what I've tried. 8 Answers 8 ...
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What is Ad Hoc Query?

... Ad hoc is latin for "for this purpose". You might call it an "on the fly" query, or a "just so" query. It's the kind of SQL query you just loosely type out where you need it var newSqlQuery = "SELECT * FROM table WHERE id = " + myI...
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Mutex example / tutorial? [closed]

... their loved ones. The first person to catch the door-handle of the booth, is the one who is allowed to use the phone. He has to keep holding on to the handle of the door as long as he uses the phone, otherwise someone else will catch hold of the handle, throw him out and talk to his wife :) There's...
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MySQL select where column is not empty

In MySQL, can I select columns only where something exists? 13 Answers 13 ...