大约有 44,000 项符合查询结果（耗时：0.0536秒） [XML]
Detecting if an NSString contains…?
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In iOS8 you can now use:
BOOL containsString = [@"Here is my string." containsString:@"is"];
There's an interesting post on how to "retrofit" it to iOS7 here:
http://petersteinberger.com/blog/2014/retrofitting-containsstring-on-ios-7/
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Add Foreign Key to existing table
...d an index to it..
ALTER TABLE users ADD INDEX index_name (index_column)
Now add the constraint
ALTER TABLE foreign_key_table
ADD CONSTRAINT foreign_key_name FOREIGN KEY (foreign_key_column)
REFERENCES primary_key_table (primary_key_column) ON DELETE NO ACTION
ON UPDATE CASCADE;
Note if you d...
Displaying the #include hierarchy for a C++ file in Visual Studio
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There is now a plugin for Visual Studio called IncludeToolbox. It can list your dependent includes and do more things like a random remove and compile to see if that include was required.
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How to convert an image to base64 encoding?
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Excellent tip, now i will create be a function to edit file upload, or a revert move_uploaded_file(), thanks
– Vinicius De Jesus
Mar 28 at 13:54
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How to enable NSZombie in Xcode?
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Environment variables are now part of the "scheme".
To edit the scheme and turn on zombies:
In the "Product" menu, select "Edit Scheme".
Go to the "Run Foo.app" stage in the left panel, and the "Arguments" tab on the right.
Add NSZombieEnabled to ...
Querying data by joining two tables in two database on different servers
...ENQUERY([DB2], 'SELECT * FROM [MyDatabaseOnDB2].[dbo].[MyOtherTable]')
-- Now I can join my temp table to see the data
SELECT * FROM [MyDatabaseOnDB1].[dbo].[MyTable] tab1
INNER JOIN #myTempTable tab2 ON tab1.ID = tab2.ID
Check out the documentation for OPENQUERY to see some more examples. T...
What does string::npos mean in this code?
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is to define your own signed value for npos:
const int NPOS = -1;
Now the comparison looks a bit different and even more convenient:
if (idx == NPOS) { // works almost always
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}
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How to get a list of user accounts using the command line in MySQL?
... using the MySQL command line utility and can navigate through a database. Now I need to see a list of user accounts. How can I do this?
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linq query to return distinct field values from a list of objects
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Now I can see there is an overload of Distinct in LINQ which take an IEqualityComparer as parameter and return a list of distinct objects depending upon the implementation of methods in IEqualityComparer
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Matlab: Running an m-file from command-line
..., end, exit"
I found the original reference here. Since original link is now gone, here is the link to an alternate newreader still alive today:
exit matlab when running batch m file
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