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How to best display in Terminal a MySQL SELECT returning too many fields?
...crolled horizontally and vertically with the cursor keys.
Leave this view by hitting the q key, which will quit the less tool.
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Using Kafka as a (CQRS) Eventstore. Good idea?
...oduct, etc). This way, the current state of an entity can be reconstituted by re-applying all events in the stream. Each Kafka topic consists of one or more partitions and each partition is stored as a directory on the file system. There will also be pressure from ZooKeeper as the number of znodes i...
How to repair a serialized string which has been corrupted by an incorrect byte count length?
...
Notice: unserialize() [function.unserialize]: Error at offset 337 of 338 bytes
Recalculating
$data = preg_replace('!s:(\d+):"(.*?)";!e', "'s:'.strlen('$2').':\"$2\";'", $data);
var_dump(unserialize($data));
Output
array
'submit_editorial' => boolean false
'submit_orig_url' => stri...
Difference between Document-based and Key/Value-based databases?
...lean values.
Querying
I believe column-family stores can only be queried by key, or by writing map-reduce functions. You cannot query the values like you would in an SQL database. If your application needs more complex queries, your application will have to create and maintain indexes in order to ...
What is the purpose of class methods?
... way. The most interesting thing about them is that they can be overridden by subclasses, something that's simply not possible in Java's static methods or Python's module-level functions.
If you have a class MyClass, and a module-level function that operates on MyClass (factory, dependency injectio...
How to get indices of a sorted array in Python
...x, value):
[(0, 1), (1, 2), (2, 3), (3, 100), (4, 5)]
You sort the list by passing it to sorted and specifying a function to extract the sort key (the second element of each tuple; that's what the lambda is for. Finally, the original index of each sorted element is extracted using the [i[0] for i...
When to use f:viewAction / preRenderView versus PostConstruct?
...rticularly useful if you want to perform actions based on model values set by <f:viewParam> during update model values phase. Namely, they are not available at the moment the @PostConstruct runs. In JSF 2.0/2.1, this tag didn't exist and you have to use the preRenderView workaround.
If the ba...
Set environment variables on Mac OS X Lion
...ile comes in. When you start the Terminal app in OS X you get a bash shell by default. The bash shell comes from Unix and when it loads it runs the .bash_profile script. You can modify this script for your user to change your settings. This file is located at:
~/.bash_profile
Update for Maveric...
What does -D_XOPEN_SOURCE do/mean?
...pen 7, incorporating POSIX 2008
You can tell which one you need (if any) by looking at the man page for each function you call.
For example, man strdup says:
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
strdup(): _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE ...
MySQL integer field is returned as string in PHP
...k to an integer using the following code:
$id = (int) $row['userid'];
Or by using the function intval():
$id = intval($row['userid']);
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