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                Core Exceptions
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<h1>SQLAlchemy 0.6.8 Documentation</h1>

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    Version: <span class="versionnum">0.6.8</span> Last Updated: 06/05/2011 13:10:26
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                Core Exceptions
             

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                Core Exceptions
            
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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 <tt class="xref py py-class docutils literal"><span class="pre">SQLAlchemyError</span></tt>.  Exceptions which are raised as a
result of DBAPI exceptions are all subclasses of
<tt class="xref py py-class docutils literal"><span class="pre">DBAPIError</span></tt>.</p>
<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>Bases: <a class="reference internal" href="#sqlalchemy.exc.SQLAlchemyError" title="sqlalchemy.exc.SQLAlchemyError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.SQLAlchemyError</span></tt></a></p>
<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><big>)</big><a class="headerlink" href="#sqlalchemy.exc.CircularDependencyError" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#sqlalchemy.exc.SQLAlchemyError" title="sqlalchemy.exc.SQLAlchemyError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.SQLAlchemyError</span></tt></a></p>
<p>Raised by topological sorts when a circular dependency is detected</p>
</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>Bases: <a class="reference internal" href="#sqlalchemy.exc.SQLAlchemyError" title="sqlalchemy.exc.SQLAlchemyError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.SQLAlchemyError</span></tt></a></p>
<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>Bases: <a class="reference internal" href="#sqlalchemy.exc.SQLAlchemyError" title="sqlalchemy.exc.SQLAlchemyError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.SQLAlchemyError</span></tt></a></p>
<p>Raised when the execution of a database operation fails.</p>
<p><tt class="docutils literal"><span class="pre">DBAPIError</span></tt> 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&#8217;s
<tt class="docutils literal"><span class="pre">DBAPIError</span></tt> when possible.  DB-API&#8217;s <tt class="docutils literal"><span class="pre">Error</span></tt> type maps to
<tt class="docutils literal"><span class="pre">DBAPIError</span></tt> 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>If the error-raising operation occured in the execution of a SQL
statement, that statement and its parameters will be available on
the exception object in the <tt class="docutils literal"><span class="pre">statement</span></tt> and <tt class="docutils literal"><span class="pre">params</span></tt> attributes.</p>
<p>The wrapped exception object is available in the <tt class="docutils literal"><span class="pre">orig</span></tt> 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>Bases: <a class="reference internal" href="#sqlalchemy.exc.DatabaseError" title="sqlalchemy.exc.DatabaseError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.DatabaseError</span></tt></a></p>
<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>Bases: <a class="reference internal" href="#sqlalchemy.exc.DBAPIError" title="sqlalchemy.exc.DBAPIError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.DBAPIError</span></tt></a></p>
<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>Bases: <a class="reference internal" href="#sqlalchemy.exc.SQLAlchemyError" title="sqlalchemy.exc.SQLAlchemyError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.SQLAlchemyError</span></tt></a></p>
<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 a <tt class="docutils literal"><span class="pre">PoolListener</span></tt> so that the host pool forces a disconnect.</p>
</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>Bases: <a class="reference internal" href="#sqlalchemy.exc.SQLAlchemyError" title="sqlalchemy.exc.SQLAlchemyError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.SQLAlchemyError</span></tt></a></p>
<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>Bases: <a class="reference internal" href="#sqlalchemy.exc.DatabaseError" title="sqlalchemy.exc.DatabaseError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.DatabaseError</span></tt></a></p>
<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>Bases: <a class="reference internal" href="#sqlalchemy.exc.DBAPIError" title="sqlalchemy.exc.DBAPIError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.DBAPIError</span></tt></a></p>
<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>Bases: <a class="reference internal" href="#sqlalchemy.exc.DatabaseError" title="sqlalchemy.exc.DatabaseError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.DatabaseError</span></tt></a></p>
<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>Bases: <a class="reference internal" href="#sqlalchemy.exc.SQLAlchemyError" title="sqlalchemy.exc.SQLAlchemyError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.SQLAlchemyError</span></tt></a></p>
<p>SQLAlchemy was asked to do something it can&#8217;t do.</p>
<p>This error generally corresponds to runtime state errors.</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>Bases: <a class="reference internal" href="#sqlalchemy.exc.InvalidRequestError" title="sqlalchemy.exc.InvalidRequestError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.InvalidRequestError</span></tt></a></p>
<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><a class="headerlink" href="#sqlalchemy.exc.NoReferencedColumnError" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#sqlalchemy.exc.NoReferenceError" title="sqlalchemy.exc.NoReferenceError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.NoReferenceError</span></tt></a></p>
<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><a class="headerlink" href="#sqlalchemy.exc.NoReferencedTableError" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#sqlalchemy.exc.NoReferenceError" title="sqlalchemy.exc.NoReferenceError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.NoReferenceError</span></tt></a></p>
<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>Bases: <tt class="xref py py-class docutils literal"><span class="pre">exceptions.KeyError</span></tt>, <a class="reference internal" href="#sqlalchemy.exc.InvalidRequestError" title="sqlalchemy.exc.InvalidRequestError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.InvalidRequestError</span></tt></a></p>
<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.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>Bases: <a class="reference internal" href="#sqlalchemy.exc.InvalidRequestError" title="sqlalchemy.exc.InvalidRequestError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.InvalidRequestError</span></tt></a></p>
<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>Bases: <a class="reference internal" href="#sqlalchemy.exc.DatabaseError" title="sqlalchemy.exc.DatabaseError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.DatabaseError</span></tt></a></p>
<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>Bases: <a class="reference internal" href="#sqlalchemy.exc.DatabaseError" title="sqlalchemy.exc.DatabaseError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.DatabaseError</span></tt></a></p>
<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>Bases: <a class="reference internal" href="#sqlalchemy.exc.DatabaseError" title="sqlalchemy.exc.DatabaseError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.DatabaseError</span></tt></a></p>
<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>Bases: <a class="reference internal" href="#sqlalchemy.exc.InvalidRequestError" title="sqlalchemy.exc.InvalidRequestError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.InvalidRequestError</span></tt></a></p>
<p>An operation was requested from a connection, cursor, or other
object that&#8217;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>Bases: <tt class="xref py py-class docutils literal"><span class="pre">exceptions.DeprecationWarning</span></tt></p>
<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>Bases: <tt class="xref py py-class docutils literal"><span class="pre">exceptions.PendingDeprecationWarning</span></tt></p>
<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>Bases: <tt class="xref py py-class docutils literal"><span class="pre">exceptions.RuntimeWarning</span></tt></p>
<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>Bases: <tt class="xref py py-class docutils literal"><span class="pre">exceptions.Exception</span></tt></p>
<p>Generic error class.</p>
</dd></dl>

<dl class="attribute">
<dt id="sqlalchemy.exc.SQLError">
<tt class="descclassname">sqlalchemy.exc.</tt><tt class="descname">SQLError</tt><a class="headerlink" href="#sqlalchemy.exc.SQLError" title="Permalink to this definition">¶</a></dt>
<dd><p>alias of <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></p>
</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>Bases: <a class="reference internal" href="#sqlalchemy.exc.SQLAlchemyError" title="sqlalchemy.exc.SQLAlchemyError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.SQLAlchemyError</span></tt></a></p>
<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>Bases: <a class="reference internal" href="#sqlalchemy.exc.InvalidRequestError" title="sqlalchemy.exc.InvalidRequestError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.exc.InvalidRequestError</span></tt></a></p>
<p>SQL was attempted without a database connection to execute it on.</p>
</dd></dl>

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