大约有 47,000 项符合查询结果(耗时:0.0587秒) [XML]

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How does database indexing work? [closed]

...ive million rows and is unindexed. The performance of several queries will now be analyzed. These are a query using the id (a sorted key field) and one using the firstName (a non-key unsorted field). Example 1 - sorted vs unsorted fields Given our sample database of r = 5,000,000 records of a fixe...
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glVertexAttribPointer clarification

...fore you render, you need to enable it with glEnableVertexAttribArray(0);. Now that an attribute is enabled, you need to define the data it's going to use. In order to do so you need to bind your VBO - glBindBuffer(GL_ARRAY_BUFFER, myBuffer);. And now we can define the attribute - glVertexAttribPoin...
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Rails: convert UTC DateTime to another time zone

... zone = ActiveSupport::TimeZone.new("Central Time (US & Canada)") Time.now.in_time_zone(zone) or just Time.now.in_time_zone("Central Time (US & Canada)") You can find the names of the ActiveSupport time zones by doing: ActiveSupport::TimeZone.all.map(&:name) # or for just US Active...
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C multi-line macro: do/while(0) vs scope block [duplicate]

...) foo(a); else bar(a); where 'foo' and 'bar' are ordinary functions. Now imagine that you'd like to replace function 'foo' with a macro of the above nature if (<condition>) CALL_FUNCS(a); else bar(a); Now, if your macro is defined in accordance with the second approach (just { and...
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Hiding a password in a python script (insecure obfuscation only)

...own own file. For passwords that the user of the script isn't allowed to know - you can run the script with elavated permission and have the password file owned by that root/admin user. share | imp...
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Is there a Google Voice API? [closed]

... Its gone now. How did it work and where is it? – 0xcaff Jul 14 '16 at 1:14 ...
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Get timezone from DateTime

... DateTime itself contains no real timezone information. It may know if it's UTC or local, but not what local really means. DateTimeOffset is somewhat better - that's basically a UTC time and an offset. However, that's still not really enough to determine the timezone, as many different t...
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How can I resolve “Error: No developer directory found at /Developer”?

...using a script to build (and then deploy through Testflight) my app. But I now receive this error: 4 Answers ...
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Why does ++[[]][+[]]+[+[]] return the string “10”?

... itself. In this case, + sees two operands: a number and an array. It’s now trying to coerce the two into the same type. First, the array is coerced into the string "0", next, the number is coerced into a string ("1"). Number + String === String. "1" + "0" === "10" // Yay! Specification deta...
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Work on a remote project with Eclipse via SSH

...(Wait as the remote project is created.) If done correctly, there should now be a new remote project accessible from the Project Explorer and other perspectives within eclipse. With the SSH connection set-up correctly passwords can be made an optional part of the normal SSH authentication process....