יום רביעי, 6 במרץ 2013

06-03-2013

c++

tuple <int,int> getDimensions ()
{
    return make_tuple (1,2);
} 

int w , h ;

tee (w,h) = getDimensions()

forword_as_tuple

SQL_SERVER


check constraint violation 547


non repeatable read


set XACT_ABORT


האם להרוג את הטרנזקציה גם על שגיאה קלה

@@Error 
XACT_STATE commit המצב של הטרנזקציה האם היא ניתנת ל 
Save Transaction here 
Rollback Transaction here
https://www.simple-talk.com/sql/t-sql-programming/handling-constraint-violations-and-errors-in-sql-server/
 

Hadoop


Input format


abstract class FileInputFormat


expend it TextInputFormat

























InputFormat:Description:Key:Value:
TextInputFormatDefault format; reads lines of text filesThe byte offset of the lineThe line contents
KeyValueInputFormatParses lines into key, val pairsEverything up to the first tab characterThe remainder of the line
SequenceFileInputFormatA Hadoop-specific high-performance binary formatuser-defineduser-defined


InputFormats provided by MapReduce


input split –> break the data into task if 64 Bit 


JopConfig object


Camel


CamelContext context = new DefaultCamelContext ();


eip –> enterprise integration pattern


jms:queue:IncomingOrders


ActiveMqComponent based on jmsComponent


pool connection factory


Neo4j


GraphDatabaseFactory().NewEmbededDataBase ()


loadPropertiesFromFile (neo4j.properties )


Embedded Linux


Enable Disable BlockLayer


The kernel command line –> from configuration


slab cache



kmem_cache_create allocate free destroy


memory pools


mempool create


setup macro – deprecated


python


slicing 


from collections import Sequence

class MyList(Sequence):
    def __init__(self, *items):
        self.data = list(items)

    def __len__(self):
        return len(self.data)

    def __getitem__(self, slice):
        return self.data[slice]

s = MyList(1,2,3)
# lots of free methods
print s[1:2], len(s), bool(s), s.count(3), s.index(2), iter(s)



Ruby


def thing.greet(greeting, *names)
  names.each do |name|
    puts "#{greeting}, #{name}!"
  end
end

>> thing.greet("Hello", "Alice", "Bob", "Charlie")
Hello, Alice!
Hello, Bob!
Hello, Charlie!



Java Script


prototype


 


 


 


 


 

 

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