大约有 48,000 项符合查询结果（耗时：0.0812秒） [XML]
Change Activity's theme programmatically
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191
As docs say you have to call setTheme before any view output. It seems that super.onCreate() t...
What is an MvcHtmlString and when should I use it?
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answered Feb 19 '10 at 2:16
LeviLevi
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Correct mime type for .mp4
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answered May 4 '12 at 17:32
TRiGTRiG
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How to add an auto-incrementing primary key to an existing table, in PostgreSQL?
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Modern Versions of PostgreSQL
Suppose you have a table named test1, to which you want to add an auto-incrementing, primary-key id (surrogate) column. The following command should be sufficient in recent versions of PostgreSQL:
ALTER TABLE test1 ADD COLUMN id SERIAL PRIMARY KEY;
Older...
MySQL get the date n days ago as a timestamp
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182
DATE_SUB will do part of it depending on what you want
mysql> SELECT DATE_SUB(NOW(), INTER...
Return 0 if field is null in MySQL
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Use IFNULL:
IFNULL(expr1, 0)
From the documentation:
If expr1 is not NULL, IFNULL() returns expr1; otherwise it returns expr2. IFNULL() returns a numeric or string value, depending on the context in which it is used.
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Chrome: timeouts/interval suspended in background tabs?
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91
I recently asked about this and it is behaviour by design. When a tab is inactive, only at a max...
Use StringFormat to add a string to a WPF XAML binding
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answered Oct 9 '13 at 17:22
Reed CopseyReed Copsey
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Intellij IDEA generate for-each/for keyboard shortcut
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318
you can use 'live templates' to generate several types of code snippets, loop iteration is done...