author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Thu, 11 Mar 2010 19:49:40 +0100 | |
branch | stable |
changeset 4872 | edfc071d2659 |
parent 2789 | 39712da6f397 |
permissions | -rw-r--r-- |
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.. -*- coding: utf-8 -*- |
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Introduction à `LAX` |
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==================== |
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Concepts et vocabulaire |
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----------------------- |
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*schéma* |
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le schéma définit le modèle de données d'une application sous forme |
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d'entités et de relations. C'est l'élément central d'une |
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application. |
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*result set* |
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objet encaspulant les résultats d'une requête à l'entrepôt de données |
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et des informations sur cette requête. |
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*vue* |
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une vue est une manière de représenter les données d'un `result set` |
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sous forme HTML, CSV, JSON, etc. |
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Définition d'une application de Blog |
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==================================== |
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La première chose à faire est de copier le répertoire ``lax`` |
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vers un nouveau répertoire qui sera votre application ``Google AppEngine``:: |
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$ cp -r lax myapp |
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Définition du schéma |
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Ouvrir le fichier ``myapp/schema.py`` afin de définir le schéma des |
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données manipulées. La syntaxe de la définition est la même que celle |
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proposée par `Google AppEngine` mais il faut remplacer la ligne |
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d'import:: |
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from google.appengine.ext import db |
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par celle-ci:: |
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from ginco.goa import db |
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Un exemple de schéma de données pour un ``Blog`` pourrait être:: |
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from ginco.goa import db |
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class BlogEntry(db.Model): |
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# un titre à donner à l'entrée |
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title = db.StringProperty(required=True) |
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# la date à laquelle le blog est créé |
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diem = db.DateProperty(required=True, auto_now_add=True) |
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# le contenu de l'entrée |
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content = db.TextProperty() |
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# une entrée peut en citer une autre |
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cites = db.SelfReferenceProperty() |
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Personnalisation des vues |
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`LAX` permet d'obtenir directement, à partir de la définition |
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du schéma, de générer des vues de consultation, d'ajout et |
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de modification pour tous les types de donées manipulés. |
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Il est toutefois généralement souhaitable de personnaliser |
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les vues de consultations. |
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Dans `LAX`, les vues sont représentées par des classes Python. |
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Une vue se caractèrise par : |
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- un identifiant (tous les objets dans `LAX` sont enregistrés |
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dans un registre et cet identifiant sert de clé pour y retrouver |
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la vue) |
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- une description des types de données auxquels elle s'applique |
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Il existe dans `LAX` des vues prédéfinies et utilisées par le moteur |
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d'affichage. Pour avoir une liste exhaustive de ces vues prédéfinies, |
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vous pouvez consulter cette page. (XXX mettre le lien vers la liste). |
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Par exemple, la vue ``primary`` est la vue utilisée pour générer la |
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page principale de consultation d'un objet. |
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Par exemple, si on souhaite modifier la page principale d'une entrée de |
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blog, il faut surcharger la vue ``primary`` des objets ``BlogEntry`` dans |
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le fichier ``myapp/views.py``:: |
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from ginco.web.views import baseviews |
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class BlogEntryPrimaryView(baseviews.PrimaryView): |
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accepts = ('BlogEntry',) |
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def cell_call(self, row, col): |
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entity = self.rset.get_entity(row, col) |
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self.w(u'<h1>%s</h1>' % entity.title) |
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self.w(u'<div>%s</div>' entity.content) |
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Génération du graphique de schéma |
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Il existe une vue ``schema`` qui permet d'afficher un graphique |
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106 |
représantant les différents types d'entités définis dans le schéma |
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ainsi que les relations entre ces types. Ce graphique doit être généré |
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108 |
statiquement. Le script à utiliser pour générer ce schéma est |
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dans ``myapp/tools``. Ce script nécessite d'avoir accès aux |
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bibliothèques fournies par le SDK de ``Google AppEngine``. Il faut |
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donc modifier son PYTHONPATH:: |
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$ export PYTHONPATH=GAE_ROOT/google:GAE_ROOT/lib/yaml |
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$ python tools/generate_schema_img.py |
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Génération des fichiers de traduction |
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------------------------------------- |
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119 |
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Des catalogues de traduction se trouvent dans `myapp/i18n`. Il faut |
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pour l'instant les mettre à jour à la main (et/ou avec les outils |
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``GNU`` comme ``xgettext``) et ensuite les compiler grâce au script |
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``myapp/tools/i18ncompile.py``:: |
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124 |
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$ export PYTHONPATH=GAE_ROOT/google:GAE_ROOT/lib/yaml |
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$ python tools/i18ncompile.py |
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127 |