大约有 9,000 项符合查询结果（耗时：0.0454秒） [XML]
AppInventor2中的二进制数据以什么样的形式传递？字节列表、字节数组是什么...
...e> list2 = new List<Byte> (array2);
建议：处理字节数据时优先使用 byte［］，只有在需要频繁增删操作时才考虑List<Byte>。
How to work around the lack of transactions in MongoDB?
...know whether this comes from my limited viewpoint (I have only worked with SQL databases so far), or whether it actually can't be done.
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What is the most ridiculous pessimization you've seen? [closed]
... ad hoc Access connections to the production DB. Nothing like a few casual SQL'ers to forget a WHERE clause and deadlock the main tables!
– HardCode
Mar 28 '09 at 5:09
35
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Good MapReduce examples [closed]
... values and perform any sort of transformations on these.
For Example In SQL, Given the Date of Birth, to find out How many people are of age > 30 for a million records would take a while, and this would only increase in order of magnitute when the complexity of the query increases.
Map Reduce...
控件重绘函数/消息OnPaint,OnDraw,OnDrawItem,DrawItem的区别 - C/C++ - 清...
...DrawItem()-àDrawItem();
4.DrawItem:虚函数,需要重载
如果使用DrawItem来自画控件,需要给控件加上自画样式,然后重载该控件类的自画函数(DrawItem)函数,如果该控件的父窗口提供了ON_WM_DRAWITEM消息映射宏,并重载了OnDrawItem函数,则重画...
Rails: Default sort order for a rails model?
...efault_scope { order(created_at: :desc) } if, like me, you try to minimize sql syntax in rails.<br/>If you have multiple columns to order by and you want to use the new syntax you may need to wrap the desc columns in mustaches like this default_scope { order({begin_date: :desc}, :name) }
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Is there a software-engineering methodology for functional programming? [closed]
...elational definition of the essential state in clojure without reinventing sql (without its flaws)? Or is the idea to simply use a good relational (sql) DB and built a functional program on top of it without the conceptual mismatch introduced by OOP?
– Thorsten
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What's the false operator in C# good for?
...ample >0 for true, <0 for false and ==0 for null, and then you'd get SQL-style null semantics. You would also have to implement a .IsNull method or property in order that nullity could be checked explicitly.
Comparing to SQL, imagine a table Table with 3 rows with value Foo set to true, 3 ro...
What is Normalisation (or Normalization)?
...y a number. A higher number means fewer redundancies and dependencies. Any SQL table is in 1NF (first normal form, pretty much by definition) Normalizing means changing the schema (often partitioning the tables) in a reversible way, giving a model which is functionally identical, except with less re...
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