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ERROR 1452: Cannot add or update a child row: a foreign key constraint fails
...relationships involve a parent table that holds the
central data values, and a child table with identical values pointing
back to its parent. The FOREIGN KEY clause is specified in the child
table.
It will reject any INSERT or UPDATE operation that attempts to create
a foreign key value...
How to convert all text to lowercase in Vim
...rocessor). If you want to convert text to lowercase, create a visual block and press u (or U to convert to uppercase). Tilde (~) in command mode reverses case of the character under the cursor.
If you want to see all text in Vim in small caps, you might want to look at the guifont option, or type :s...
Container View Controller Examples [closed]
...roller Class Reference . I feel I need a little more information than that and an example implementation would be nice. Google has turned up nothing at all.
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Does MongoDB's $in clause guarantee order
...the results
{ "$sort": { "weight": 1 } }
])
So that would be the expanded form. What basically happens here is that just as the array of values is passed to $in you also construct a "nested" $cond statement to test the values and assign an appropriate weight. As that "weight" value reflects t...
Select multiple records based on list of Id's with linq
...
Contains() will handle that equality check on each id value if you use it as I've written in the answer. You don't have to explicitly write == anywhere when you're trying to compare the items of one set (the array) against another (the datab...
How do you get assembler output from C/C++ source in gcc?
... the preprocessor (cpp) over helloworld.c, perform the initial compilation and then stop before the assembler is run.
By default this will output a file helloworld.s. The output file can be still be set by using the -o option.
gcc -S -o my_asm_output.s helloworld.c
Of course this only works if y...
Sorting an array of objects by property values
I've got the following objects using AJAX and stored them in an array:
30 Answers
30
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SQLite with encryption/password protection
I'm just learning to use SQLite and I was curious if such is possible:
9 Answers
9
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What is the use for IHttpHandler.IsReusable?
I'm writing a IHttpHandler and I'll need to implement a IsReusable property. When I look at the MSDN documentation it says:
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Get last n lines of a file, similar to tail
I'm writing a log file viewer for a web application and for that I want to paginate through the lines of the log file. The items in the file are line based with the newest item on the bottom.
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