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Published on 2010-04-30T09:04:58Z
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When people talk about object impedence mismatch, where does the mismatch happen? What can't a database interpret from an object model?
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I'm teaching JEE, especially JPA, Spring and Spring MVC. As I have not so much experience in large projects, it is difficult to know what to present to students about optimisation of ORM.
At the present time, I present some classic optimisation tricks:
prepared statements (most of ORM implicitely…
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Just wondering what everyones thoughts on what ORM to use for SQL Azure?
I'm fairly comfortable using LINQ-to-SQL and I believe it is possible to get it working with SQL Azure. However, from my understanding (correct me if I'm wrong), no further improvements will be made to Linq-to-SQL in future…
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Hello,
although I read through the manual here:
http://www.doctrine-project.org/documentation/manual/1_2/hu/hierarchical-data
I couldn't find a way to move a node from a Leaf to become a Root node. Any clues?
The question is trivial for inserting a new node...but what about updating a node?
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I've been thinking for a while about defining several namespaces in one php file and so, having several classes inside this file.
Suppose, I want to implement something like Doctrine\ORM\Query\Expr:
Expr.php
Expr
|-- Andx.php
|-- Base.php
|-- Comparison.php
|-- Composite.php
|-- From.php
|-- Func…
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I want to remove the need for a username in the FOSUserBundle. My users will login using an email address only and I've added real name fields as part of the user entity.
I realised that I needed to redo the entire mapping as described here.
I think I've done it correctly but when I try to submit…
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I recently downloaded Ideras SQL virtual database, and tested it. There are a few things about this tool which caught my attention.My ScenarioIt is quite common in real life that sometimes observing or retrieving older data is necessary; however, it had changed as time passed by. The full database…
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To clone a database using Rman we used to require an existing Rman backup, on 11g we can clone databases using the "from active" database option.
In this case we do not require an existing backup, the active datafiles will be used as the source for the clone.
In order to clone with the source database…
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Hello,
I'm using cPickle to save my Database into file. The code looks like that:
def Save_DataBase():
import cPickle
from scipy import *
from numpy import *
a=Results.VersionName
#filename='D:/results/'+a[a.find('/')+1:-a.find('/')-2]+Results.AssType[:3]+str(random.randint(0,100))+Results.Distribution+"…
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Snapshot database is one of the most interesting concepts that I have used at some places recently.
Here is a quick definition of the subject from Book On Line:
A Database Snapshot is a read-only, static view of a database (the source database). Multiple snapshots can exist on a source database and…
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