大约有 40,000 项符合查询结果（耗时：0.1186秒） [XML]
MySQL CONCAT returns NULL if any field contain NULL
...es: it returns the first non-NULL value parameter passed to it (or NULL if all parameters are NULL). By passing an empty string as the second parameter, you are guaranteeing it will not return NULL.
– Jo.
Mar 10 '17 at 17:03
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Collection was modified; enumeration operation may not execute
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Is that a complete example? I have a class (_dictionary obj below) that contains a generic Dictionary<string,int> named MarkerFrequencies, but doing this didn't instantly solve the crash: lock (_dictionary.MarkerFrequencies) { foreach (KeyValuePair<string, int...
Is it acceptable and safe to run pip install under sudo?
...ns together will get me back on track :)
– markwalker_
Feb 22 '13 at 16:40
1
also, for installing...
Clear form field after select for jQuery UI Autocomplete
...it works around line 109 here.
The code in there checks for false specifically:
if ( false !== self._trigger( "select", event, { item: item } ) ) {
self.element.val( item.value );
}
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imp...
Drawable image on a canvas
...setBounds(left, top, right, bottom);
d.draw(canvas);
This will work with all kinds of drawables, not only bitmaps. And it also means that you can re-use that same drawable again if only the size changes.
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Inserting data into a temporary table
...
To insert all data from all columns, just use this:
SELECT * INTO #TempTable
FROM OriginalTable
Don't forget to DROP the temporary table after you have finished with it and before you try creating it again:
DROP TABLE #TempTable
...
What is the Swift equivalent of respondsToSelector?
...e are multiple candidates: let theMethod = delegate.userNotificationCenter(_:willPresent:withCompletionHandler:)
– Cœur
May 4 '18 at 8:47
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What's the difference between a mock & stub?
...anything.
Difference between Mocks and Stubs
Tests written with mocks usually follow an initialize -> set expectations -> exercise -> verify pattern to testing. While the pre-written stub would follow an initialize -> exercise -> verify.
Similarity between Mocks and Stubs
The pur...
How to dynamically update a ListView on Android [closed]
...lns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<!-- Pretty hint text, and maxLines -->
<EditText android:id="@+building_list/search_box"
android...
Replace selector images programmatically
...that has a drawable image resource set to a selector. How do I programmatically access the selector and change the images of the highlighted and non-highlighted state?
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