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Confusion: @NotNull vs. @Column(nullable = false) with JPA and Hibernate
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@NotNull is a JSR 303 Bean Validation annotation. It has nothing to do with database constraints...
Memory management in Qt?
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If you build your own hierarchy with QObjects, that is, you initialise all newly created QObjec...
What's the difference between returning void and returning a Task?
...ippert
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Where does forever store console.log output?
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edited Apr 21 '17 at 20:12
answered Jan 9 '14 at 13:11
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Fast way of finding lines in one file that are not in another?
I have two large files (sets of filenames). Roughly 30.000 lines in each file. I am trying to find a fast way of finding lines in file1 that are not present in file2.
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Requirejs why and when to use shim config
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A primary use of shim is with libraries that don't support AMD, but you need to manage their dep...
Python pip install fails: invalid command egg_info
...tall Distribute.
Distribute has been merged into Setuptools as of version 0.7. If you are using a version <=0.6, upgrade using pip install --upgrade setuptools or easy_install -U setuptools.
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Best way to randomize an array with .NET
...t way to randomize an array of strings with .NET? My array contains about 500 strings and I'd like to create a new Array with the same strings but in a random order.
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Is it a bad practice to use break in a for loop? [closed]
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answered Oct 13 '10 at 17:16
e.Jamese.James
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从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...L(Cassandra, HBase, MongoDB)。
注：NoSQL的实现在mahout-integration-0.8.jar中。
数据格式支持2种：
GenericDataModel: 用户ID，物品ID，用户对物品的打分(UserID,ItemID,PreferenceValue)
GenericBooleanPrefDataModel: 用户ID，物品ID (UserID,ItemID)，这种方式表...