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examples.inheritance.joined
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SQLAlchemy 0.9 Documentation
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Release: <span class="version-num">0.9.8</span> | Release Date: October 13, 2014
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<h1>SQLAlchemy 0.9 Documentation</h1>
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<h1>Source code for examples.inheritance.joined</h1><div class="highlight"><pre>
<span class="sd">"""Joined-table (table-per-subclass) inheritance example."""</span>
<span class="kn">from</span> <span class="nn">sqlalchemy</span> <span class="kn">import</span> <span class="n">Table</span><span class="p">,</span> <span class="n">Column</span><span class="p">,</span> <span class="n">Integer</span><span class="p">,</span> <span class="n">String</span><span class="p">,</span> \
<span class="n">ForeignKey</span><span class="p">,</span> <span class="n">create_engine</span><span class="p">,</span> <span class="n">inspect</span><span class="p">,</span> <span class="n">or_</span>
<span class="kn">from</span> <span class="nn">sqlalchemy.orm</span> <span class="kn">import</span> <span class="n">relationship</span><span class="p">,</span> <span class="n">Session</span><span class="p">,</span> <span class="n">with_polymorphic</span>
<span class="kn">from</span> <span class="nn">sqlalchemy.ext.declarative</span> <span class="kn">import</span> <span class="n">declarative_base</span>
<span class="n">Base</span> <span class="o">=</span> <span class="n">declarative_base</span><span class="p">()</span>
<span class="k">class</span> <span class="nc">Company</span><span class="p">(</span><span class="n">Base</span><span class="p">):</span>
<span class="n">__tablename__</span> <span class="o">=</span> <span class="s">'company'</span>
<span class="nb">id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">primary_key</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="mi">50</span><span class="p">))</span>
<span class="n">employees</span> <span class="o">=</span> <span class="n">relationship</span><span class="p">(</span><span class="s">"Person"</span><span class="p">,</span>
<span class="n">backref</span><span class="o">=</span><span class="s">'company'</span><span class="p">,</span>
<span class="n">cascade</span><span class="o">=</span><span class="s">'all, delete-orphan'</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s">"Company </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span>
<span class="k">class</span> <span class="nc">Person</span><span class="p">(</span><span class="n">Base</span><span class="p">):</span>
<span class="n">__tablename__</span> <span class="o">=</span> <span class="s">'person'</span>
<span class="nb">id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">primary_key</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="n">company_id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">ForeignKey</span><span class="p">(</span><span class="s">'company.id'</span><span class="p">))</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="mi">50</span><span class="p">))</span>
<span class="nb">type</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="mi">50</span><span class="p">))</span>
<span class="n">__mapper_args__</span> <span class="o">=</span> <span class="p">{</span>
<span class="s">'polymorphic_identity'</span><span class="p">:</span><span class="s">'person'</span><span class="p">,</span>
<span class="s">'polymorphic_on'</span><span class="p">:</span><span class="nb">type</span>
<span class="p">}</span>
<span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s">"Ordinary person </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span>
<span class="k">class</span> <span class="nc">Engineer</span><span class="p">(</span><span class="n">Person</span><span class="p">):</span>
<span class="n">__tablename__</span> <span class="o">=</span> <span class="s">'engineer'</span>
<span class="nb">id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">ForeignKey</span><span class="p">(</span><span class="s">'person.id'</span><span class="p">),</span> <span class="n">primary_key</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="n">status</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="mi">30</span><span class="p">))</span>
<span class="n">engineer_name</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="mi">30</span><span class="p">))</span>
<span class="n">primary_language</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="mi">30</span><span class="p">))</span>
<span class="n">__mapper_args__</span> <span class="o">=</span> <span class="p">{</span>
<span class="s">'polymorphic_identity'</span><span class="p">:</span><span class="s">'engineer'</span><span class="p">,</span>
<span class="p">}</span>
<span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s">"Engineer </span><span class="si">%s</span><span class="s">, status </span><span class="si">%s</span><span class="s">, engineer_name </span><span class="si">%s</span><span class="s">, "</span>\
<span class="s">"primary_language </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> \
<span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">status</span><span class="p">,</span>
<span class="bp">self</span><span class="o">.</span><span class="n">engineer_name</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">primary_language</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">Manager</span><span class="p">(</span><span class="n">Person</span><span class="p">):</span>
<span class="n">__tablename__</span> <span class="o">=</span> <span class="s">'manager'</span>
<span class="nb">id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">ForeignKey</span><span class="p">(</span><span class="s">'person.id'</span><span class="p">),</span> <span class="n">primary_key</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="n">status</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="mi">30</span><span class="p">))</span>
<span class="n">manager_name</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="mi">30</span><span class="p">))</span>
<span class="n">__mapper_args__</span> <span class="o">=</span> <span class="p">{</span>
<span class="s">'polymorphic_identity'</span><span class="p">:</span><span class="s">'manager'</span><span class="p">,</span>
<span class="p">}</span>
<span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s">"Manager </span><span class="si">%s</span><span class="s">, status </span><span class="si">%s</span><span class="s">, manager_name </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> \
<span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">status</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">manager_name</span><span class="p">)</span>
<span class="n">engine</span> <span class="o">=</span> <span class="n">create_engine</span><span class="p">(</span><span class="s">'sqlite://'</span><span class="p">,</span> <span class="n">echo</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="n">Base</span><span class="o">.</span><span class="n">metadata</span><span class="o">.</span><span class="n">create_all</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span>
<span class="n">session</span> <span class="o">=</span> <span class="n">Session</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">Company</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'company1'</span><span class="p">,</span> <span class="n">employees</span><span class="o">=</span><span class="p">[</span>
<span class="n">Manager</span><span class="p">(</span>
<span class="n">name</span><span class="o">=</span><span class="s">'pointy haired boss'</span><span class="p">,</span>
<span class="n">status</span><span class="o">=</span><span class="s">'AAB'</span><span class="p">,</span>
<span class="n">manager_name</span><span class="o">=</span><span class="s">'manager1'</span><span class="p">),</span>
<span class="n">Engineer</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'dilbert'</span><span class="p">,</span>
<span class="n">status</span><span class="o">=</span><span class="s">'BBA'</span><span class="p">,</span>
<span class="n">engineer_name</span><span class="o">=</span><span class="s">'engineer1'</span><span class="p">,</span>
<span class="n">primary_language</span><span class="o">=</span><span class="s">'java'</span><span class="p">),</span>
<span class="n">Person</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'joesmith'</span><span class="p">),</span>
<span class="n">Engineer</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'wally'</span><span class="p">,</span>
<span class="n">status</span><span class="o">=</span><span class="s">'CGG'</span><span class="p">,</span>
<span class="n">engineer_name</span><span class="o">=</span><span class="s">'engineer2'</span><span class="p">,</span>
<span class="n">primary_language</span><span class="o">=</span><span class="s">'python'</span><span class="p">),</span>
<span class="n">Manager</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'jsmith'</span><span class="p">,</span>
<span class="n">status</span><span class="o">=</span><span class="s">'ABA'</span><span class="p">,</span>
<span class="n">manager_name</span><span class="o">=</span><span class="s">'manager2'</span><span class="p">)</span>
<span class="p">])</span>
<span class="n">session</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<span class="n">session</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">Company</span><span class="p">)</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">c</span><span class="o">.</span><span class="n">employees</span><span class="p">:</span>
<span class="k">print</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">inspect</span><span class="p">(</span><span class="n">e</span><span class="p">)</span><span class="o">.</span><span class="n">key</span><span class="p">,</span> <span class="n">e</span><span class="o">.</span><span class="n">company</span><span class="p">)</span>
<span class="k">assert</span> <span class="nb">set</span><span class="p">([</span><span class="n">e</span><span class="o">.</span><span class="n">name</span> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">c</span><span class="o">.</span><span class="n">employees</span><span class="p">])</span> <span class="o">==</span> <span class="nb">set</span><span class="p">([</span><span class="s">'pointy haired boss'</span><span class="p">,</span>
<span class="s">'dilbert'</span><span class="p">,</span> <span class="s">'joesmith'</span><span class="p">,</span> <span class="s">'wally'</span><span class="p">,</span> <span class="s">'jsmith'</span><span class="p">])</span>
<span class="k">print</span><span class="p">(</span><span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">)</span>
<span class="n">dilbert</span> <span class="o">=</span> <span class="n">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">Person</span><span class="p">)</span><span class="o">.</span><span class="n">filter_by</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'dilbert'</span><span class="p">)</span><span class="o">.</span><span class="n">one</span><span class="p">()</span>
<span class="n">dilbert2</span> <span class="o">=</span> <span class="n">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">Engineer</span><span class="p">)</span><span class="o">.</span><span class="n">filter_by</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'dilbert'</span><span class="p">)</span><span class="o">.</span><span class="n">one</span><span class="p">()</span>
<span class="k">assert</span> <span class="n">dilbert</span> <span class="ow">is</span> <span class="n">dilbert2</span>
<span class="n">dilbert</span><span class="o">.</span><span class="n">engineer_name</span> <span class="o">=</span> <span class="s">'hes dilbert!'</span>
<span class="n">session</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">Company</span><span class="p">)</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">c</span><span class="o">.</span><span class="n">employees</span><span class="p">:</span>
<span class="k">print</span><span class="p">(</span><span class="n">e</span><span class="p">)</span>
<span class="c"># query using with_polymorphic.</span>
<span class="n">eng_manager</span> <span class="o">=</span> <span class="n">with_polymorphic</span><span class="p">(</span><span class="n">Person</span><span class="p">,</span> <span class="p">[</span><span class="n">Engineer</span><span class="p">,</span> <span class="n">Manager</span><span class="p">],</span> <span class="n">aliased</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="n">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">eng_manager</span><span class="p">)</span><span class="o">.</span>\
<span class="nb">filter</span><span class="p">(</span>
<span class="n">or_</span><span class="p">(</span><span class="n">eng_manager</span><span class="o">.</span><span class="n">Engineer</span><span class="o">.</span><span class="n">engineer_name</span><span class="o">==</span><span class="s">'engineer1'</span><span class="p">,</span>
<span class="n">eng_manager</span><span class="o">.</span><span class="n">Manager</span><span class="o">.</span><span class="n">manager_name</span><span class="o">==</span><span class="s">'manager2'</span>
<span class="p">)</span>
<span class="p">)</span><span class="o">.</span><span class="n">all</span><span class="p">())</span>
<span class="c"># illustrate join from Company,</span>
<span class="c"># We use aliased=True</span>
<span class="c"># to help when the selectable is used as the target of a join.</span>
<span class="n">eng_manager</span> <span class="o">=</span> <span class="n">with_polymorphic</span><span class="p">(</span><span class="n">Person</span><span class="p">,</span> <span class="p">[</span><span class="n">Engineer</span><span class="p">,</span> <span class="n">Manager</span><span class="p">],</span> <span class="n">aliased</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="n">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">Company</span><span class="p">)</span><span class="o">.</span>\
<span class="n">join</span><span class="p">(</span>
<span class="n">eng_manager</span><span class="p">,</span>
<span class="n">Company</span><span class="o">.</span><span class="n">employees</span>
<span class="p">)</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span>
<span class="n">or_</span><span class="p">(</span><span class="n">eng_manager</span><span class="o">.</span><span class="n">Engineer</span><span class="o">.</span><span class="n">engineer_name</span><span class="o">==</span><span class="s">'engineer1'</span><span class="p">,</span>
<span class="n">eng_manager</span><span class="o">.</span><span class="n">Manager</span><span class="o">.</span><span class="n">manager_name</span><span class="o">==</span><span class="s">'manager2'</span><span class="p">)</span>
<span class="p">)</span><span class="o">.</span><span class="n">all</span><span class="p">())</span>
<span class="n">session</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span></pre></div>
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