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E11000 duplicate key error index in mongodb mongoose
...dexed field, the index build will fail with a duplicate key error.
You can combine the unique constraint with the sparse index to filter these null values from the unique index and avoid the error.
unique indexes
Sparse indexes only contain entries for documents that have the indexed field, even i...
MySQL “incorrect string value” error when save unicode string in Django
...rs and store them in MySQL. Just changing mysql charset to utf8mb4 via SQL commands is not enough!
– Xerion
Aug 6 '15 at 4:24
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Stop and Start a service via batch or cmd file?
...ut, etc) and for many errors will simply return Errorlevel 2.
Look here: http://ss64.com/nt/net_service.html
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Efficient way to determine number of digits in an integer
...when the architecture expands to 256 bit integers. You need to remember to come back and modify this code. In real life that will not happen and sice this is probably going to be used to build a buffer of the correct size you are now opening yourself to all sorts of buffer over run problems on large...
AngularJS ng-style with a conditional expression
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373
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Performing Inserts and Updates with Dapper
...deciding on APIs and if this goes in core or not. See: https://code.google.com/archive/p/dapper-dot-net/issues/6 for progress.
In the mean time you can do the following
val = "my value";
cnn.Execute("insert into Table(val) values (@val)", new {val});
cnn.Execute("update Table set val = @val whe...
Are there any standard exit status codes in Linux?
...istd.h>
#include <signal.h>
int main() {
int status;
pid_t child = fork();
if (child <= 0)
exit(42);
waitpid(child, &status, 0);
if (WIFEXITED(status))
printf("first child exited with %u\n", WEXITSTATUS(status));
/* prints: "first child exite...
How do I access call log for android?
...Int(c.getString(c.getColumnIndex(CallLog.Calls.TYPE)));// for call type, Incoming or out going.
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How to convert array to SimpleXML
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393
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Readonly Properties in Objective-C?
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In the implementation .m file:
// inside one of my init methods
self->_foo = @"someString"; // Notice the underscore prefix of var name.
That’s it, that’s all you need. No muss, no fuss.
Details
As of Xcode 4.4 and LLVM Compiler 4.0 (New Features in Xcode 4.4), you need not mess with th...