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Core Exceptions
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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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<h3><a href="#">
Core Exceptions
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<li><a class="reference internal" href="#">Core Exceptions</a></li>
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<div class="section" id="module-sqlalchemy.exc">
<span id="core-exceptions"></span><h1>Core Exceptions<a class="headerlink" href="#module-sqlalchemy.exc" title="Permalink to this headline">¶</a></h1>
<p>Exceptions used with SQLAlchemy.</p>
<p>The base exception class is <a class="reference internal" href="#sqlalchemy.exc.SQLAlchemyError" title="sqlalchemy.exc.SQLAlchemyError"><tt class="xref py py-exc docutils literal"><span class="pre">SQLAlchemyError</span></tt></a>. Exceptions which are
raised as a result of DBAPI exceptions are all subclasses of
<a class="reference internal" href="#sqlalchemy.exc.DBAPIError" title="sqlalchemy.exc.DBAPIError"><tt class="xref py py-exc docutils literal"><span class="pre">DBAPIError</span></tt></a>.</p>
<dl class="exception">
<dt id="sqlalchemy.exc.AmbiguousForeignKeysError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">AmbiguousForeignKeysError</tt><a class="headerlink" href="#sqlalchemy.exc.AmbiguousForeignKeysError" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised when more than one foreign key matching can be located
between two selectables during a join.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.ArgumentError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">ArgumentError</tt><a class="headerlink" href="#sqlalchemy.exc.ArgumentError" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised when an invalid or conflicting function argument is supplied.</p>
<p>This error generally corresponds to construction time state errors.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.CircularDependencyError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">CircularDependencyError</tt><big>(</big><em>message</em>, <em>cycles</em>, <em>edges</em>, <em>msg=None</em><big>)</big><a class="headerlink" href="#sqlalchemy.exc.CircularDependencyError" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised by topological sorts when a circular dependency is detected.</p>
<p>There are two scenarios where this error occurs:</p>
<ul class="simple">
<li>In a Session flush operation, if two objects are mutually dependent
on each other, they can not be inserted or deleted via INSERT or
DELETE statements alone; an UPDATE will be needed to post-associate
or pre-deassociate one of the foreign key constrained values.
The <tt class="docutils literal"><span class="pre">post_update</span></tt> flag described at <a class="reference internal" href="../orm/relationships.html#post-update"><em>Rows that point to themselves / Mutually Dependent Rows</em></a> can resolve
this cycle.</li>
<li>In a <a class="reference internal" href="metadata.html#sqlalchemy.schema.MetaData.create_all" title="sqlalchemy.schema.MetaData.create_all"><tt class="xref py py-meth docutils literal"><span class="pre">MetaData.create_all()</span></tt></a>, <a class="reference internal" href="metadata.html#sqlalchemy.schema.MetaData.drop_all" title="sqlalchemy.schema.MetaData.drop_all"><tt class="xref py py-meth docutils literal"><span class="pre">MetaData.drop_all()</span></tt></a>,
<a class="reference internal" href="metadata.html#sqlalchemy.schema.MetaData.sorted_tables" title="sqlalchemy.schema.MetaData.sorted_tables"><tt class="xref py py-attr docutils literal"><span class="pre">MetaData.sorted_tables</span></tt></a> operation, two <a class="reference internal" href="constraints.html#sqlalchemy.schema.ForeignKey" title="sqlalchemy.schema.ForeignKey"><tt class="xref py py-class docutils literal"><span class="pre">ForeignKey</span></tt></a>
or <a class="reference internal" href="constraints.html#sqlalchemy.schema.ForeignKeyConstraint" title="sqlalchemy.schema.ForeignKeyConstraint"><tt class="xref py py-class docutils literal"><span class="pre">ForeignKeyConstraint</span></tt></a> objects mutually refer to each
other. Apply the <tt class="docutils literal"><span class="pre">use_alter=True</span></tt> flag to one or both,
see <a class="reference internal" href="constraints.html#use-alter"><em>Creating/Dropping Foreign Key Constraints via ALTER</em></a>.</li>
</ul>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.CompileError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">CompileError</tt><a class="headerlink" href="#sqlalchemy.exc.CompileError" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised when an error occurs during SQL compilation</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.DBAPIError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">DBAPIError</tt><big>(</big><em>statement</em>, <em>params</em>, <em>orig</em>, <em>connection_invalidated=False</em><big>)</big><a class="headerlink" href="#sqlalchemy.exc.DBAPIError" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised when the execution of a database operation fails.</p>
<p>Wraps exceptions raised by the DB-API underlying the
database operation. Driver-specific implementations of the standard
DB-API exception types are wrapped by matching sub-types of SQLAlchemy’s
<a class="reference internal" href="#sqlalchemy.exc.DBAPIError" title="sqlalchemy.exc.DBAPIError"><tt class="xref py py-class docutils literal"><span class="pre">DBAPIError</span></tt></a> when possible. DB-API’s <tt class="docutils literal"><span class="pre">Error</span></tt> type maps to
<a class="reference internal" href="#sqlalchemy.exc.DBAPIError" title="sqlalchemy.exc.DBAPIError"><tt class="xref py py-class docutils literal"><span class="pre">DBAPIError</span></tt></a> in SQLAlchemy, otherwise the names are identical. Note
that there is no guarantee that different DB-API implementations will
raise the same exception type for any given error condition.</p>
<p><a class="reference internal" href="#sqlalchemy.exc.DBAPIError" title="sqlalchemy.exc.DBAPIError"><tt class="xref py py-class docutils literal"><span class="pre">DBAPIError</span></tt></a> features <a class="reference internal" href="#sqlalchemy.exc.StatementError.statement" title="sqlalchemy.exc.StatementError.statement"><tt class="xref py py-attr docutils literal"><span class="pre">statement</span></tt></a>
and <a class="reference internal" href="#sqlalchemy.exc.StatementError.params" title="sqlalchemy.exc.StatementError.params"><tt class="xref py py-attr docutils literal"><span class="pre">params</span></tt></a> attributes which supply context
regarding the specifics of the statement which had an issue, for the
typical case when the error was raised within the context of
emitting a SQL statement.</p>
<p>The wrapped exception object is available in the
<a class="reference internal" href="#sqlalchemy.exc.StatementError.orig" title="sqlalchemy.exc.StatementError.orig"><tt class="xref py py-attr docutils literal"><span class="pre">orig</span></tt></a> attribute. Its type and properties are
DB-API implementation specific.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.DataError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">DataError</tt><big>(</big><em>statement</em>, <em>params</em>, <em>orig</em>, <em>connection_invalidated=False</em><big>)</big><a class="headerlink" href="#sqlalchemy.exc.DataError" title="Permalink to this definition">¶</a></dt>
<dd><p>Wraps a DB-API DataError.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.DatabaseError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">DatabaseError</tt><big>(</big><em>statement</em>, <em>params</em>, <em>orig</em>, <em>connection_invalidated=False</em><big>)</big><a class="headerlink" href="#sqlalchemy.exc.DatabaseError" title="Permalink to this definition">¶</a></dt>
<dd><p>Wraps a DB-API DatabaseError.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.DisconnectionError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">DisconnectionError</tt><a class="headerlink" href="#sqlalchemy.exc.DisconnectionError" title="Permalink to this definition">¶</a></dt>
<dd><p>A disconnect is detected on a raw DB-API connection.</p>
<p>This error is raised and consumed internally by a connection pool. It can
be raised by the <a class="reference internal" href="events.html#sqlalchemy.events.PoolEvents.checkout" title="sqlalchemy.events.PoolEvents.checkout"><tt class="xref py py-meth docutils literal"><span class="pre">PoolEvents.checkout()</span></tt></a> event so that the host pool
forces a retry; the exception will be caught three times in a row before
the pool gives up and raises <a class="reference internal" href="#sqlalchemy.exc.InvalidRequestError" title="sqlalchemy.exc.InvalidRequestError"><tt class="xref py py-class docutils literal"><span class="pre">InvalidRequestError</span></tt></a>
regarding the connection attempt.</p>
</dd></dl>
<dl class="class">
<dt id="sqlalchemy.exc.DontWrapMixin">
<em class="property">class </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">DontWrapMixin</tt><a class="headerlink" href="#sqlalchemy.exc.DontWrapMixin" title="Permalink to this definition">¶</a></dt>
<dd><p>A mixin class which, when applied to a user-defined Exception class,
will not be wrapped inside of <a class="reference internal" href="#sqlalchemy.exc.StatementError" title="sqlalchemy.exc.StatementError"><tt class="xref py py-exc docutils literal"><span class="pre">StatementError</span></tt></a> if the error is
emitted within the process of executing a statement.</p>
<p>E.g.:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">sqlalchemy.exc</span> <span class="kn">import</span> <span class="n">DontWrapMixin</span>
<span class="k">class</span> <span class="nc">MyCustomException</span><span class="p">(</span><span class="ne">Exception</span><span class="p">,</span> <span class="n">DontWrapMixin</span><span class="p">):</span>
<span class="k">pass</span>
<span class="k">class</span> <span class="nc">MySpecialType</span><span class="p">(</span><span class="n">TypeDecorator</span><span class="p">):</span>
<span class="n">impl</span> <span class="o">=</span> <span class="n">String</span>
<span class="k">def</span> <span class="nf">process_bind_param</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">dialect</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="o">==</span> <span class="s">'invalid'</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">MyCustomException</span><span class="p">(</span><span class="s">"invalid!"</span><span class="p">)</span></pre></div>
</div>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.IdentifierError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">IdentifierError</tt><a class="headerlink" href="#sqlalchemy.exc.IdentifierError" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised when a schema name is beyond the max character limit</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.IntegrityError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">IntegrityError</tt><big>(</big><em>statement</em>, <em>params</em>, <em>orig</em>, <em>connection_invalidated=False</em><big>)</big><a class="headerlink" href="#sqlalchemy.exc.IntegrityError" title="Permalink to this definition">¶</a></dt>
<dd><p>Wraps a DB-API IntegrityError.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.InterfaceError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">InterfaceError</tt><big>(</big><em>statement</em>, <em>params</em>, <em>orig</em>, <em>connection_invalidated=False</em><big>)</big><a class="headerlink" href="#sqlalchemy.exc.InterfaceError" title="Permalink to this definition">¶</a></dt>
<dd><p>Wraps a DB-API InterfaceError.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.InternalError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">InternalError</tt><big>(</big><em>statement</em>, <em>params</em>, <em>orig</em>, <em>connection_invalidated=False</em><big>)</big><a class="headerlink" href="#sqlalchemy.exc.InternalError" title="Permalink to this definition">¶</a></dt>
<dd><p>Wraps a DB-API InternalError.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.InvalidRequestError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">InvalidRequestError</tt><a class="headerlink" href="#sqlalchemy.exc.InvalidRequestError" title="Permalink to this definition">¶</a></dt>
<dd><p>SQLAlchemy was asked to do something it can’t do.</p>
<p>This error generally corresponds to runtime state errors.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.NoForeignKeysError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">NoForeignKeysError</tt><a class="headerlink" href="#sqlalchemy.exc.NoForeignKeysError" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised when no foreign keys can be located between two selectables
during a join.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.NoInspectionAvailable">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">NoInspectionAvailable</tt><a class="headerlink" href="#sqlalchemy.exc.NoInspectionAvailable" title="Permalink to this definition">¶</a></dt>
<dd><p>A subject passed to <a class="reference internal" href="inspection.html#sqlalchemy.inspection.inspect" title="sqlalchemy.inspection.inspect"><tt class="xref py py-func docutils literal"><span class="pre">sqlalchemy.inspection.inspect()</span></tt></a> produced
no context for inspection.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.NoReferenceError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">NoReferenceError</tt><a class="headerlink" href="#sqlalchemy.exc.NoReferenceError" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised by <tt class="docutils literal"><span class="pre">ForeignKey</span></tt> to indicate a reference cannot be resolved.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.NoReferencedColumnError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">NoReferencedColumnError</tt><big>(</big><em>message</em>, <em>tname</em>, <em>cname</em><big>)</big><a class="headerlink" href="#sqlalchemy.exc.NoReferencedColumnError" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised by <tt class="docutils literal"><span class="pre">ForeignKey</span></tt> when the referred <tt class="docutils literal"><span class="pre">Column</span></tt> cannot be
located.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.NoReferencedTableError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">NoReferencedTableError</tt><big>(</big><em>message</em>, <em>tname</em><big>)</big><a class="headerlink" href="#sqlalchemy.exc.NoReferencedTableError" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised by <tt class="docutils literal"><span class="pre">ForeignKey</span></tt> when the referred <tt class="docutils literal"><span class="pre">Table</span></tt> cannot be
located.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.NoSuchColumnError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">NoSuchColumnError</tt><a class="headerlink" href="#sqlalchemy.exc.NoSuchColumnError" title="Permalink to this definition">¶</a></dt>
<dd><p>A nonexistent column is requested from a <tt class="docutils literal"><span class="pre">RowProxy</span></tt>.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.NoSuchModuleError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">NoSuchModuleError</tt><a class="headerlink" href="#sqlalchemy.exc.NoSuchModuleError" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised when a dynamically-loaded module (usually a database dialect)
of a particular name cannot be located.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.NoSuchTableError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">NoSuchTableError</tt><a class="headerlink" href="#sqlalchemy.exc.NoSuchTableError" title="Permalink to this definition">¶</a></dt>
<dd><p>Table does not exist or is not visible to a connection.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.NotSupportedError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">NotSupportedError</tt><big>(</big><em>statement</em>, <em>params</em>, <em>orig</em>, <em>connection_invalidated=False</em><big>)</big><a class="headerlink" href="#sqlalchemy.exc.NotSupportedError" title="Permalink to this definition">¶</a></dt>
<dd><p>Wraps a DB-API NotSupportedError.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.OperationalError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">OperationalError</tt><big>(</big><em>statement</em>, <em>params</em>, <em>orig</em>, <em>connection_invalidated=False</em><big>)</big><a class="headerlink" href="#sqlalchemy.exc.OperationalError" title="Permalink to this definition">¶</a></dt>
<dd><p>Wraps a DB-API OperationalError.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.ProgrammingError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">ProgrammingError</tt><big>(</big><em>statement</em>, <em>params</em>, <em>orig</em>, <em>connection_invalidated=False</em><big>)</big><a class="headerlink" href="#sqlalchemy.exc.ProgrammingError" title="Permalink to this definition">¶</a></dt>
<dd><p>Wraps a DB-API ProgrammingError.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.ResourceClosedError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">ResourceClosedError</tt><a class="headerlink" href="#sqlalchemy.exc.ResourceClosedError" title="Permalink to this definition">¶</a></dt>
<dd><p>An operation was requested from a connection, cursor, or other
object that’s in a closed state.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.SADeprecationWarning">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">SADeprecationWarning</tt><a class="headerlink" href="#sqlalchemy.exc.SADeprecationWarning" title="Permalink to this definition">¶</a></dt>
<dd><p>Issued once per usage of a deprecated API.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.SAPendingDeprecationWarning">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">SAPendingDeprecationWarning</tt><a class="headerlink" href="#sqlalchemy.exc.SAPendingDeprecationWarning" title="Permalink to this definition">¶</a></dt>
<dd><p>Issued once per usage of a deprecated API.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.SAWarning">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">SAWarning</tt><a class="headerlink" href="#sqlalchemy.exc.SAWarning" title="Permalink to this definition">¶</a></dt>
<dd><p>Issued at runtime.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.SQLAlchemyError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">SQLAlchemyError</tt><a class="headerlink" href="#sqlalchemy.exc.SQLAlchemyError" title="Permalink to this definition">¶</a></dt>
<dd><p>Generic error class.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.StatementError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">StatementError</tt><big>(</big><em>message</em>, <em>statement</em>, <em>params</em>, <em>orig</em><big>)</big><a class="headerlink" href="#sqlalchemy.exc.StatementError" title="Permalink to this definition">¶</a></dt>
<dd><p>An error occurred during execution of a SQL statement.</p>
<p><a class="reference internal" href="#sqlalchemy.exc.StatementError" title="sqlalchemy.exc.StatementError"><tt class="xref py py-class docutils literal"><span class="pre">StatementError</span></tt></a> wraps the exception raised
during execution, and features <a class="reference internal" href="#sqlalchemy.exc.StatementError.statement" title="sqlalchemy.exc.StatementError.statement"><tt class="xref py py-attr docutils literal"><span class="pre">statement</span></tt></a>
and <a class="reference internal" href="#sqlalchemy.exc.StatementError.params" title="sqlalchemy.exc.StatementError.params"><tt class="xref py py-attr docutils literal"><span class="pre">params</span></tt></a> attributes which supply context regarding
the specifics of the statement which had an issue.</p>
<p>The wrapped exception object is available in
the <a class="reference internal" href="#sqlalchemy.exc.StatementError.orig" title="sqlalchemy.exc.StatementError.orig"><tt class="xref py py-attr docutils literal"><span class="pre">orig</span></tt></a> attribute.</p>
<dl class="attribute">
<dt id="sqlalchemy.exc.StatementError.orig">
<tt class="descname">orig</tt><em class="property"> = None</em><a class="headerlink" href="#sqlalchemy.exc.StatementError.orig" title="Permalink to this definition">¶</a></dt>
<dd><p>The DBAPI exception object.</p>
</dd></dl>
<dl class="attribute">
<dt id="sqlalchemy.exc.StatementError.params">
<tt class="descname">params</tt><em class="property"> = None</em><a class="headerlink" href="#sqlalchemy.exc.StatementError.params" title="Permalink to this definition">¶</a></dt>
<dd><p>The parameter list being used when this exception occurred.</p>
</dd></dl>
<dl class="attribute">
<dt id="sqlalchemy.exc.StatementError.statement">
<tt class="descname">statement</tt><em class="property"> = None</em><a class="headerlink" href="#sqlalchemy.exc.StatementError.statement" title="Permalink to this definition">¶</a></dt>
<dd><p>The string SQL statement being invoked when this exception occurred.</p>
</dd></dl>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.TimeoutError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">TimeoutError</tt><a class="headerlink" href="#sqlalchemy.exc.TimeoutError" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised when a connection pool times out on getting a connection.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.UnboundExecutionError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">UnboundExecutionError</tt><a class="headerlink" href="#sqlalchemy.exc.UnboundExecutionError" title="Permalink to this definition">¶</a></dt>
<dd><p>SQL was attempted without a database connection to execute it on.</p>
</dd></dl>
<dl class="exception">
<dt id="sqlalchemy.exc.UnsupportedCompilationError">
<em class="property">exception </em><tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">UnsupportedCompilationError</tt><big>(</big><em>compiler</em>, <em>element_type</em><big>)</big><a class="headerlink" href="#sqlalchemy.exc.UnsupportedCompilationError" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised when an operation is not supported by the given compiler.</p>
<div class="versionadded">
<p><span>New in version 0.8.3.</span></p>
</div>
</dd></dl>
</div>
</div>
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