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<h1>Source code for sqlobject.views</h1><div class="highlight"><pre>
<span></span><span class="kn">from</span> <span class="nn">.main</span> <span class="k">import</span> <span class="n">SQLObject</span>
<span class="kn">from</span> <span class="nn">.sqlbuilder</span> <span class="k">import</span> <span class="n">AND</span><span class="p">,</span> <span class="n">Alias</span><span class="p">,</span> <span class="n">ColumnAS</span><span class="p">,</span> <span class="n">LEFTJOINOn</span><span class="p">,</span> \
<span class="n">NoDefault</span><span class="p">,</span> <span class="n">SQLCall</span><span class="p">,</span> <span class="n">SQLConstant</span><span class="p">,</span> <span class="n">SQLObjectField</span><span class="p">,</span> <span class="n">SQLObjectTable</span><span class="p">,</span> <span class="n">SQLOp</span><span class="p">,</span> \
<span class="n">Select</span><span class="p">,</span> <span class="n">sqlrepr</span>
<div class="viewcode-block" id="ViewSQLObjectField"><a class="viewcode-back" href="../../api/sqlobject.views.html#sqlobject.tests.test_views.ViewSQLObjectField">[docs]</a><span class="k">class</span> <span class="nc">ViewSQLObjectField</span><span class="p">(</span><span class="n">SQLObjectField</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">alias</span><span class="p">,</span> <span class="o">*</span><span class="n">arg</span><span class="p">):</span>
<span class="n">SQLObjectField</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">arg</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">alias</span> <span class="o">=</span> <span class="n">alias</span>
<span class="k">def</span> <span class="nf">__sqlrepr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">db</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">alias</span> <span class="o">+</span> <span class="s2">"."</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">fieldName</span>
<div class="viewcode-block" id="ViewSQLObjectField.tablesUsedImmediate"><a class="viewcode-back" href="../../api/sqlobject.views.html#sqlobject.tests.test_views.ViewSQLObjectField.tablesUsedImmediate">[docs]</a> <span class="k">def</span> <span class="nf">tablesUsedImmediate</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">tableName</span><span class="p">]</span>
</div></div>
<div class="viewcode-block" id="ViewSQLObjectTable"><a class="viewcode-back" href="../../api/sqlobject.views.html#sqlobject.tests.test_views.ViewSQLObjectTable">[docs]</a><span class="k">class</span> <span class="nc">ViewSQLObjectTable</span><span class="p">(</span><span class="n">SQLObjectTable</span><span class="p">):</span>
<span class="n">FieldClass</span> <span class="o">=</span> <span class="n">ViewSQLObjectField</span>
<span class="k">def</span> <span class="nf">__getattr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">attr</span><span class="p">):</span>
<span class="k">if</span> <span class="n">attr</span> <span class="o">==</span> <span class="s1">'sqlmeta'</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">AttributeError</span>
<span class="k">return</span> <span class="n">SQLObjectTable</span><span class="o">.</span><span class="fm">__getattr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">attr</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_getattrFromID</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">attr</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">FieldClass</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">soClass</span><span class="o">.</span><span class="n">sqlmeta</span><span class="o">.</span><span class="n">alias</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">tableName</span><span class="p">,</span>
<span class="s1">'id'</span><span class="p">,</span> <span class="n">attr</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">soClass</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_getattrFromColumn</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">column</span><span class="p">,</span> <span class="n">attr</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">FieldClass</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">soClass</span><span class="o">.</span><span class="n">sqlmeta</span><span class="o">.</span><span class="n">alias</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">tableName</span><span class="p">,</span>
<span class="n">column</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">attr</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">soClass</span><span class="p">,</span> <span class="n">column</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="ViewSQLObject"><a class="viewcode-back" href="../../api/sqlobject.views.html#sqlobject.tests.test_views.ViewSQLObject">[docs]</a><span class="k">class</span> <span class="nc">ViewSQLObject</span><span class="p">(</span><span class="n">SQLObject</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A SQLObject class that derives all it's values from other SQLObject</span>
<span class="sd"> classes. Columns on subclasses should use SQLBuilder constructs for dbName,</span>
<span class="sd"> and sqlmeta should specify:</span>
<span class="sd"> * idName as a SQLBuilder construction</span>
<span class="sd"> * clause as SQLBuilder clause for specifying join conditions</span>
<span class="sd"> or other restrictions</span>
<span class="sd"> * table as an optional alternate name for the class alias</span>
<span class="sd"> See test_views.py for simple examples.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__classinit__</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">new_attrs</span><span class="p">):</span>
<span class="n">SQLObject</span><span class="o">.</span><span class="n">__classinit__</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">new_attrs</span><span class="p">)</span>
<span class="c1"># like is_base</span>
<span class="k">if</span> <span class="bp">cls</span><span class="o">.</span><span class="vm">__name__</span> <span class="o">!=</span> <span class="s1">'ViewSQLObject'</span><span class="p">:</span>
<span class="n">dbName</span> <span class="o">=</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="s1">'_connection'</span><span class="p">)</span> <span class="ow">and</span> \
<span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">_connection</span> <span class="ow">and</span> <span class="bp">cls</span><span class="o">.</span><span class="n">_connection</span><span class="o">.</span><span class="n">dbName</span><span class="p">)</span> <span class="ow">or</span> <span class="kc">None</span>
<span class="k">if</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="p">,</span> <span class="s1">'table'</span><span class="p">,</span> <span class="kc">None</span><span class="p">):</span>
<span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="o">.</span><span class="n">alias</span> <span class="o">=</span> <span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="o">.</span><span class="n">table</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="o">.</span><span class="n">alias</span> <span class="o">=</span> \
<span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="o">.</span><span class="n">style</span><span class="o">.</span><span class="n">pythonClassToDBTable</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="vm">__name__</span><span class="p">)</span>
<span class="n">alias</span> <span class="o">=</span> <span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="o">.</span><span class="n">alias</span>
<span class="n">columns</span> <span class="o">=</span> <span class="p">[</span><span class="n">ColumnAS</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="o">.</span><span class="n">idName</span><span class="p">,</span> <span class="s1">'id'</span><span class="p">)]</span>
<span class="c1"># {sqlrepr-key: [restriction, *aggregate-column]}</span>
<span class="n">aggregates</span> <span class="o">=</span> <span class="p">{</span><span class="s1">''</span><span class="p">:</span> <span class="p">[</span><span class="kc">None</span><span class="p">]}</span>
<span class="n">inverseColumns</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">(</span>
<span class="p">[(</span><span class="n">y</span><span class="p">,</span> <span class="n">x</span><span class="p">)</span> <span class="k">for</span> <span class="n">x</span><span class="p">,</span> <span class="n">y</span> <span class="ow">in</span> <span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="o">.</span><span class="n">columns</span><span class="o">.</span><span class="n">items</span><span class="p">()])</span>
<span class="k">for</span> <span class="n">col</span> <span class="ow">in</span> <span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="o">.</span><span class="n">columnList</span><span class="p">:</span>
<span class="n">n</span> <span class="o">=</span> <span class="n">inverseColumns</span><span class="p">[</span><span class="n">col</span><span class="p">]</span>
<span class="n">ascol</span> <span class="o">=</span> <span class="n">ColumnAS</span><span class="p">(</span><span class="n">col</span><span class="o">.</span><span class="n">dbName</span><span class="p">,</span> <span class="n">n</span><span class="p">)</span>
<span class="k">if</span> <span class="n">isAggregate</span><span class="p">(</span><span class="n">col</span><span class="o">.</span><span class="n">dbName</span><span class="p">):</span>
<span class="n">restriction</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">col</span><span class="p">,</span> <span class="s1">'aggregateClause'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="k">if</span> <span class="n">restriction</span><span class="p">:</span>
<span class="n">restrictkey</span> <span class="o">=</span> <span class="n">sqlrepr</span><span class="p">(</span><span class="n">restriction</span><span class="p">,</span> <span class="n">dbName</span><span class="p">)</span>
<span class="n">aggregates</span><span class="p">[</span><span class="n">restrictkey</span><span class="p">]</span> <span class="o">=</span> \
<span class="n">aggregates</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">restrictkey</span><span class="p">,</span> <span class="p">[</span><span class="n">restriction</span><span class="p">])</span> <span class="o">+</span> \
<span class="p">[</span><span class="n">ascol</span><span class="p">]</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">aggregates</span><span class="p">[</span><span class="s1">''</span><span class="p">]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">ascol</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">columns</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">ascol</span><span class="p">)</span>
<span class="n">metajoin</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="p">,</span> <span class="s1">'join'</span><span class="p">,</span> <span class="n">NoDefault</span><span class="p">)</span>
<span class="n">clause</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="p">,</span> <span class="s1">'clause'</span><span class="p">,</span> <span class="n">NoDefault</span><span class="p">)</span>
<span class="n">select</span> <span class="o">=</span> <span class="n">Select</span><span class="p">(</span><span class="n">columns</span><span class="p">,</span>
<span class="n">distinct</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span>
<span class="c1"># @@ LDO check if this really mattered</span>
<span class="c1"># for performance</span>
<span class="c1"># @@ Postgres (and MySQL?) extension!</span>
<span class="c1"># distinctOn=cls.sqlmeta.idName,</span>
<span class="n">join</span><span class="o">=</span><span class="n">metajoin</span><span class="p">,</span>
<span class="n">clause</span><span class="o">=</span><span class="n">clause</span><span class="p">)</span>
<span class="n">aggregates</span> <span class="o">=</span> <span class="n">aggregates</span><span class="o">.</span><span class="n">values</span><span class="p">()</span>
<span class="k">if</span> <span class="n">aggregates</span> <span class="o">!=</span> <span class="p">[[</span><span class="kc">None</span><span class="p">]]:</span>
<span class="n">join</span> <span class="o">=</span> <span class="p">[]</span>
<span class="n">last_alias</span> <span class="o">=</span> <span class="s2">"</span><span class="si">%s</span><span class="s2">_base"</span> <span class="o">%</span> <span class="n">alias</span>
<span class="n">last_id</span> <span class="o">=</span> <span class="s2">"id"</span>
<span class="n">last</span> <span class="o">=</span> <span class="n">Alias</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="n">last_alias</span><span class="p">)</span>
<span class="n">columns</span> <span class="o">=</span> <span class="p">[</span>
<span class="n">ColumnAS</span><span class="p">(</span><span class="n">SQLConstant</span><span class="p">(</span><span class="s2">"</span><span class="si">%s</span><span class="s2">.</span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">last_alias</span><span class="p">,</span> <span class="n">x</span><span class="o">.</span><span class="n">expr2</span><span class="p">)),</span>
<span class="n">x</span><span class="o">.</span><span class="n">expr2</span><span class="p">)</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">columns</span><span class="p">]</span>
<span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">agg</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">aggregates</span><span class="p">):</span>
<span class="n">restriction</span> <span class="o">=</span> <span class="n">agg</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">if</span> <span class="n">restriction</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">restriction</span> <span class="o">=</span> <span class="n">clause</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">restriction</span> <span class="o">=</span> <span class="n">AND</span><span class="p">(</span><span class="n">clause</span><span class="p">,</span> <span class="n">restriction</span><span class="p">)</span>
<span class="n">agg</span> <span class="o">=</span> <span class="n">agg</span><span class="p">[</span><span class="mi">1</span><span class="p">:]</span>
<span class="n">agg_alias</span> <span class="o">=</span> <span class="s2">"</span><span class="si">%s</span><span class="s2">_</span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">alias</span><span class="p">,</span> <span class="n">i</span><span class="p">)</span>
<span class="n">agg_id</span> <span class="o">=</span> <span class="s1">'</span><span class="si">%s</span><span class="s1">_id'</span> <span class="o">%</span> <span class="n">agg_alias</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">last</span><span class="o">.</span><span class="n">q</span><span class="o">.</span><span class="n">alias</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="s1">'base'</span><span class="p">):</span>
<span class="n">last</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">new_alias</span> <span class="o">=</span> <span class="n">Alias</span><span class="p">(</span><span class="n">Select</span><span class="p">(</span>
<span class="p">[</span><span class="n">ColumnAS</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="o">.</span><span class="n">idName</span><span class="p">,</span> <span class="n">agg_id</span><span class="p">)]</span> <span class="o">+</span> <span class="n">agg</span><span class="p">,</span>
<span class="n">groupBy</span><span class="o">=</span><span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="o">.</span><span class="n">idName</span><span class="p">,</span>
<span class="n">join</span><span class="o">=</span><span class="n">metajoin</span><span class="p">,</span>
<span class="n">clause</span><span class="o">=</span><span class="n">restriction</span><span class="p">),</span>
<span class="n">agg_alias</span><span class="p">)</span>
<span class="n">agg_join</span> <span class="o">=</span> <span class="n">LEFTJOINOn</span><span class="p">(</span><span class="n">last</span><span class="p">,</span> <span class="n">new_alias</span><span class="p">,</span>
<span class="s2">"</span><span class="si">%s</span><span class="s2">.</span><span class="si">%s</span><span class="s2"> = </span><span class="si">%s</span><span class="s2">.</span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span>
<span class="n">last_alias</span><span class="p">,</span> <span class="n">last_id</span><span class="p">,</span>
<span class="n">agg_alias</span><span class="p">,</span> <span class="n">agg_id</span><span class="p">))</span>
<span class="n">join</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">agg_join</span><span class="p">)</span>
<span class="k">for</span> <span class="n">col</span> <span class="ow">in</span> <span class="n">agg</span><span class="p">:</span>
<span class="n">columns</span><span class="o">.</span><span class="n">append</span><span class="p">(</span>
<span class="n">ColumnAS</span><span class="p">(</span><span class="n">SQLConstant</span><span class="p">(</span>
<span class="s2">"</span><span class="si">%s</span><span class="s2">.</span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">agg_alias</span><span class="p">,</span> <span class="n">col</span><span class="o">.</span><span class="n">expr2</span><span class="p">)),</span>
<span class="n">col</span><span class="o">.</span><span class="n">expr2</span><span class="p">))</span>
<span class="n">last</span> <span class="o">=</span> <span class="n">new_alias</span>
<span class="n">last_alias</span> <span class="o">=</span> <span class="n">agg_alias</span>
<span class="n">last_id</span> <span class="o">=</span> <span class="n">agg_id</span>
<span class="n">select</span> <span class="o">=</span> <span class="n">Select</span><span class="p">(</span><span class="n">columns</span><span class="p">,</span>
<span class="n">join</span><span class="o">=</span><span class="n">join</span><span class="p">)</span>
<span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="o">.</span><span class="n">table</span> <span class="o">=</span> <span class="n">Alias</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
<span class="bp">cls</span><span class="o">.</span><span class="n">q</span> <span class="o">=</span> <span class="n">ViewSQLObjectTable</span><span class="p">(</span><span class="bp">cls</span><span class="p">)</span>
<span class="k">for</span> <span class="n">n</span><span class="p">,</span> <span class="n">col</span> <span class="ow">in</span> <span class="bp">cls</span><span class="o">.</span><span class="n">sqlmeta</span><span class="o">.</span><span class="n">columns</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="n">col</span><span class="o">.</span><span class="n">dbName</span> <span class="o">=</span> <span class="n">n</span>
</div>
<div class="viewcode-block" id="isAggregate"><a class="viewcode-back" href="../../api/sqlobject.views.html#sqlobject.tests.test_views.isAggregate">[docs]</a><span class="k">def</span> <span class="nf">isAggregate</span><span class="p">(</span><span class="n">expr</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expr</span><span class="p">,</span> <span class="n">SQLCall</span><span class="p">):</span>
<span class="k">return</span> <span class="kc">True</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expr</span><span class="p">,</span> <span class="n">SQLOp</span><span class="p">):</span>
<span class="k">return</span> <span class="n">isAggregate</span><span class="p">(</span><span class="n">expr</span><span class="o">.</span><span class="n">expr1</span><span class="p">)</span> <span class="ow">or</span> <span class="n">isAggregate</span><span class="p">(</span><span class="n">expr</span><span class="o">.</span><span class="n">expr2</span><span class="p">)</span>
<span class="k">return</span> <span class="kc">False</span>
</pre></div></div>
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