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| author | Sebastian Silva <sebastian@sugarlabs.org> | 2011-11-16 07:56:19 (GMT) |
|---|---|---|
| committer | Sebastian Silva <sebastian@sugarlabs.org> | 2011-11-16 07:56:19 (GMT) |
| commit | 82511a6fe2d29d50c1cdca4b2abb23ff681a1943 (patch) | |
| tree | ff6359d68287417abfaaf49e492e2630239e60c9 /studio/static/doc/flask-docs/tutorial/dbcon.html | |
| parent | 61517139f02df2ce417f465dfabdbf5dbe8f4063 (diff) | |
Major improvements in IDE usability.
Diffstat (limited to 'studio/static/doc/flask-docs/tutorial/dbcon.html')
| -rw-r--r-- | studio/static/doc/flask-docs/tutorial/dbcon.html | 154 |
1 files changed, 0 insertions, 154 deletions
diff --git a/studio/static/doc/flask-docs/tutorial/dbcon.html b/studio/static/doc/flask-docs/tutorial/dbcon.html deleted file mode 100644 index 91ed599..0000000 --- a/studio/static/doc/flask-docs/tutorial/dbcon.html +++ /dev/null @@ -1,154 +0,0 @@ - -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" - "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> - - -<html xmlns="http://www.w3.org/1999/xhtml"> - <head> - <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> - - <title>Step 4: Request Database Connections — Flask 0.8 documentation</title> - - <link rel="stylesheet" href="../_static/flasky.css" type="text/css" /> - <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> - - <script type="text/javascript"> - var DOCUMENTATION_OPTIONS = { - URL_ROOT: '../', - VERSION: '0.8', - COLLAPSE_INDEX: false, - FILE_SUFFIX: '.html', - HAS_SOURCE: true - }; - </script> - <script type="text/javascript" src="../_static/jquery.js"></script> - <script type="text/javascript" src="../_static/underscore.js"></script> - <script type="text/javascript" src="../_static/doctools.js"></script> - <link rel="top" title="Flask 0.8 documentation" href="../index.html" /> - <link rel="up" title="Tutorial" href="index.html" /> - <link rel="next" title="Step 5: The View Functions" href="views.html" /> - <link rel="prev" title="Step 3: Creating The Database" href="dbinit.html" /> - - - <link rel="apple-touch-icon" href="../_static/touch-icon.png" /> - - <link media="only screen and (max-device-width: 480px)" href="../_static/small_flask.css" type= "text/css" rel="stylesheet" /> - - </head> - <body> - <div class="related"> - <h3>Navigation</h3> - <ul> - <li class="right" style="margin-right: 10px"> - <a href="../genindex.html" title="General Index" - accesskey="I">index</a></li> - <li class="right" > - <a href="views.html" title="Step 5: The View Functions" - accesskey="N">next</a> |</li> - <li class="right" > - <a href="dbinit.html" title="Step 3: Creating The Database" - accesskey="P">previous</a> |</li> - <li><a href="../index.html">Flask 0.8 documentation</a> »</li> - <li><a href="index.html" accesskey="U">Tutorial</a> »</li> - </ul> - </div> - - <div class="document"> - <div class="documentwrapper"> - <div class="bodywrapper"> - <div class="body"> - - <div class="section" id="step-4-request-database-connections"> -<span id="tutorial-dbcon"></span><h1>Step 4: Request Database Connections<a class="headerlink" href="#step-4-request-database-connections" title="Permalink to this headline">ΒΆ</a></h1> -<p>Now we know how we can open database connections and use them for scripts, -but how can we elegantly do that for requests? We will need the database -connection in all our functions so it makes sense to initialize them -before each request and shut them down afterwards.</p> -<p>Flask allows us to do that with the <a class="reference internal" href="../api.html#flask.Flask.before_request" title="flask.Flask.before_request"><tt class="xref py py-meth docutils literal"><span class="pre">before_request()</span></tt></a>, -<a class="reference internal" href="../api.html#flask.Flask.after_request" title="flask.Flask.after_request"><tt class="xref py py-meth docutils literal"><span class="pre">after_request()</span></tt></a> and <a class="reference internal" href="../api.html#flask.Flask.teardown_request" title="flask.Flask.teardown_request"><tt class="xref py py-meth docutils literal"><span class="pre">teardown_request()</span></tt></a> -decorators:</p> -<div class="highlight-python"><div class="highlight"><pre><span class="nd">@app.before_request</span> -<span class="k">def</span> <span class="nf">before_request</span><span class="p">():</span> - <span class="n">g</span><span class="o">.</span><span class="n">db</span> <span class="o">=</span> <span class="n">connect_db</span><span class="p">()</span> - -<span class="nd">@app.teardown_request</span> -<span class="k">def</span> <span class="nf">teardown_request</span><span class="p">(</span><span class="n">exception</span><span class="p">):</span> - <span class="n">g</span><span class="o">.</span><span class="n">db</span><span class="o">.</span><span class="n">close</span><span class="p">()</span> -</pre></div> -</div> -<p>Functions marked with <a class="reference internal" href="../api.html#flask.Flask.before_request" title="flask.Flask.before_request"><tt class="xref py py-meth docutils literal"><span class="pre">before_request()</span></tt></a> are called before -a request and passed no arguments. Functions marked with -<a class="reference internal" href="../api.html#flask.Flask.after_request" title="flask.Flask.after_request"><tt class="xref py py-meth docutils literal"><span class="pre">after_request()</span></tt></a> are called after a request and -passed the response that will be sent to the client. They have to return -that response object or a different one. They are however not guaranteed -to be executed if an exception is raised, this is where functions marked with -<a class="reference internal" href="../api.html#flask.Flask.teardown_request" title="flask.Flask.teardown_request"><tt class="xref py py-meth docutils literal"><span class="pre">teardown_request()</span></tt></a> come in. They get called after the -response has been constructed. They are not allowed to modify the request, and -their return values are ignored. If an exception occurred while the request was -being processed, it is passed to each function; otherwise, <cite>None</cite> is passed in.</p> -<p>We store our current database connection on the special <a class="reference internal" href="../api.html#flask.g" title="flask.g"><tt class="xref py py-data docutils literal"><span class="pre">g</span></tt></a> -object that Flask provides for us. This object stores information for one -request only and is available from within each function. Never store such -things on other objects because this would not work with threaded -environments. That special <a class="reference internal" href="../api.html#flask.g" title="flask.g"><tt class="xref py py-data docutils literal"><span class="pre">g</span></tt></a> object does some magic behind -the scenes to ensure it does the right thing.</p> -<p>Continue to <a class="reference internal" href="views.html#tutorial-views"><em>Step 5: The View Functions</em></a>.</p> -<div class="admonition hint"> -<p class="first admonition-title">Hint</p> -<p>Where do I put this code?</p> -<p>If you’ve been following along in this tutorial, you might be wondering -where to put the code from this step and the next. A logical place is to -group these module-level functions together, and put your new -<tt class="docutils literal"><span class="pre">before_request</span></tt> and <tt class="docutils literal"><span class="pre">teardown_request</span></tt> functions below your existing -<tt class="docutils literal"><span class="pre">init_db</span></tt> function (following the tutorial line-by-line).</p> -<p class="last">If you need a moment to find your bearings, take a look at how the <a class="reference external" href="http://github.com/mitsuhiko/flask/tree/master/examples/flaskr/">example -source</a> is organized. In Flask, you can put all of your application code -into a single Python module. You don’t have to, and if your app <a class="reference internal" href="../patterns/packages.html#larger-applications"><em>grows -larger</em></a>, it’s a good idea not to.</p> -</div> -</div> - - - </div> - </div> - </div> - <div class="sphinxsidebar"> - <div class="sphinxsidebarwrapper"><p class="logo"><a href="../index.html"> - <img class="logo" src="../_static/flask.png" alt="Logo"/> -</a></p><h3>Related Topics</h3> -<ul> - <li><a href="../index.html">Documentation overview</a><ul> - <li><a href="index.html">Tutorial</a><ul> - <li>Previous: <a href="dbinit.html" title="previous chapter">Step 3: Creating The Database</a></li> - <li>Next: <a href="views.html" title="next chapter">Step 5: The View Functions</a></li> - </ul></li> - </ul></li> -</ul> - <h3>This Page</h3> - <ul class="this-page-menu"> - <li><a href="../_sources/tutorial/dbcon.txt" - rel="nofollow">Show Source</a></li> - </ul> -<div id="searchbox" style="display: none"> - <h3>Quick search</h3> - <form class="search" action="../search.html" method="get"> - <input type="text" name="q" /> - <input type="submit" value="Go" /> - <input type="hidden" name="check_keywords" value="yes" /> - <input type="hidden" name="area" value="default" /> - </form> - <p class="searchtip" style="font-size: 90%"> - Enter search terms or a module, class or function name. - </p> -</div> -<script type="text/javascript">$('#searchbox').show(0);</script> - </div> - </div> - <div class="clearer"></div> - </div> - <div class="footer"> - © Copyright 2010, Armin Ronacher. - Created using <a href="http://sphinx.pocoo.org/">Sphinx</a>. - </div> - </body> -</html>
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