大约有 13,064 项符合查询结果（耗时：0.0242秒） [XML]
Precedence and bitmask operations
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You are actually doing this:
var_dump(0b10 & (0b01 == 0));
var_dump(0b10 & (0b01 != 0));
Try:
var_dump((0b10 & 0b01) == 0);
var_dump((0b10 & 0b01) != 0);
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Android SQLite: nullColumnHack parameter in insert/replace methods
The Android SDK has some convenience methods for manipulating data with SQLite. However both the insert and replace methods use some nullColumnHack parameter which usage I don't understand.
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regex to match a single character that is anything but a space
I need to match a single character that is anything but a space but I don't know how to do that with regex.
2 Answers
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Using .sort with PyMongo
With PyMongo, when I try to retrieve objects sorted by their 'number' and 'date' fields like this:
1 Answer
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Inline code highlighting in reStructuredText
I know reStructuredText has this directive:
1 Answer
1
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Eclipse Autocomplete (percent sign, in Juno)
I started using Eclipse Juno a few days ago after using older versions for years.
1 Answer
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XPath - Selecting elements that equal a value
In Xpath, I am wanting to select elements that equal a specific value.
2 Answers
2
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What's a quick way to test to see a file exists?
I want to quickly check to see if a file exists in my iPhone app's Documents directory (or any path for that matter). I can enumerate through the directory's files, or I can try to open a specific file. What's the fastest way? I just need to know if the file is there or if it does not exist.
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setting multiple column using one update
How to set multiple columns of a table using update query in mysql?
2 Answers
2
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XPath: How to check if an attribute exists?
Given the following XML, how do I write an XPath query to pull nodes where the attribute foo exists?:
3 Answers
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