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NoSQL (MongoDB) vs Lucene (or Solr) as your database
...arned:
You can easily use Lucene/Solr in lieu of MongoDB for pretty much all situations, but not vice versa. Grant Ingersoll's post sums it up here.
MongoDB etc. seem to serve a purpose where there is no requirement of searching and/or faceting. It appears to be a simpler and arguably easier trans...
rmagick gem install “Can't find Magick-config”
I get the error shown below when attempting to install the rmagick gem. I am on Snowleopard 10.6 using RVM, Ruby 1.9.2-head and Rails 3.05. Responses to similar questions recommended installing ImageMagick, which I successfully did. Other suggested installing the "libmagick9-dev library", however, I...
PHP PDO: charset, set names?
...s is probably the most elegant way to do it.
Right in the PDO constructor call, but avoiding the buggy charset option (as mentioned above):
$connect = new PDO(
"mysql:host=$host;dbname=$db",
$user,
$pass,
array(
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::MYSQL_ATTR_INIT...
Maximum single-sell profit
...oblem in each subarray, then combining the two together. Turns out we actually can do this, and can do so efficiently! The intuition is as follows. If we have a single day, the best option is to buy on that day and then sell it back on the same day for no profit. Otherwise, split the array into ...
Difference between static and shared libraries?
...
Shared libraries are .so (or in Windows .dll, or in OS X .dylib) files. All the code relating to the library is in this file, and it is referenced by programs using it at run-time. A program using a shared library only makes reference to the code that it uses in the shared library.
Static librar...
SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder”. error
...lipse, instead of it's embedded maven.
That is done in three steps:
1 Install maven on local machine (the test-machine was Ubuntu 10.10)
mvn --version
Apache Maven 2.2.1 (rdebian-4) Java version: 1.6.0_20 Java home:
/usr/lib/jvm/java-6-openjdk/jre Default locale: de_DE, platform
encoding: UTF-8 OS...
Why do I get “unresolved external symbol” errors when using templates? [duplicate]
...lated classes and functions are not instantiated until they are used, typically in a separate .cpp file (e.g. the program source). When the template is used, the compiler needs the full code for that function to be able to build the correct function with the appropriate type. However, in this case...
How do I write a correct micro-benchmark in Java?
...istics.
Rule 1: Always include a warmup phase which runs your test kernel all the way through, enough to trigger all initializations and compilations before timing phase(s). (Fewer iterations is OK on the warmup phase. The rule of thumb is several tens of thousands of inner loop iterations.)
Rule ...
Why is “copy and paste” of code dangerous? [closed]
...you will need to fix it every place you did and hope you can remember them all (this also holds for changed requirements).
If you keep logic in one place, it is easier to change when needed (so if you decide that the application needs updating, you only do it in one place).
Have your boss read abo...
How to read from a file or STDIN in Bash?
...
The following solution reads from a file if the script is called
with a file name as the first parameter $1 otherwise from standard input.
while read line
do
echo "$line"
done < "${1:-/dev/stdin}"
The substitution ${1:-...} takes $1 if defined otherwise
the file name of t...