<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title> ORM Exceptions — SQLAlchemy 0.6.8 Documentation</title> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <link rel="stylesheet" href="../_static/docs.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '0.6.8', COLLAPSE_MODINDEX: false, FILE_SUFFIX: '.html' }; </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> <script type="text/javascript" src="../_static/init.js"></script> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" 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Core</a> </li> <li> <a href="../contents.html">Table of Contents</a> | <a href="../genindex.html">Index</a> | <a href="../_sources/orm/exceptions.txt">view source </li> </ul> </div> <div id="navbanner"> <a class="totoc" href="../index.html">SQLAlchemy 0.6.8 Documentation</a> » <a href="index.html" title="SQLAlchemy ORM">SQLAlchemy ORM</a> » ORM Exceptions <h2> ORM Exceptions </h2> </div> <div class="clearboth"></div> </div> <div class="document"> <div class="body"> <div class="section" id="module-sqlalchemy.orm.exc"> <span id="orm-exceptions"></span><h1>ORM Exceptions<a class="headerlink" href="#module-sqlalchemy.orm.exc" title="Permalink to this headline">¶</a></h1> <p>SQLAlchemy ORM exceptions.</p> <dl class="attribute"> <dt id="sqlalchemy.orm.exc.ConcurrentModificationError"> <tt class="descclassname">sqlalchemy.orm.exc.</tt><tt class="descname">ConcurrentModificationError</tt><a class="headerlink" href="#sqlalchemy.orm.exc.ConcurrentModificationError" title="Permalink to this definition">¶</a></dt> <dd><p>alias of <a class="reference internal" href="#sqlalchemy.orm.exc.StaleDataError" title="sqlalchemy.orm.exc.StaleDataError"><tt class="xref py py-class docutils literal"><span class="pre">StaleDataError</span></tt></a></p> </dd></dl> <dl class="exception"> <dt id="sqlalchemy.orm.exc.DetachedInstanceError"> <em class="property">exception </em><tt class="descclassname">sqlalchemy.orm.exc.</tt><tt class="descname">DetachedInstanceError</tt><a class="headerlink" href="#sqlalchemy.orm.exc.DetachedInstanceError" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="../core/exceptions.html#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>An attempt to access unloaded attributes on a mapped instance that is detached.</p> </dd></dl> <dl class="exception"> <dt id="sqlalchemy.orm.exc.FlushError"> <em class="property">exception </em><tt class="descclassname">sqlalchemy.orm.exc.</tt><tt class="descname">FlushError</tt><a class="headerlink" href="#sqlalchemy.orm.exc.FlushError" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="../core/exceptions.html#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 invalid condition was detected during flush().</p> </dd></dl> <dl class="exception"> <dt id="sqlalchemy.orm.exc.MultipleResultsFound"> <em class="property">exception </em><tt class="descclassname">sqlalchemy.orm.exc.</tt><tt class="descname">MultipleResultsFound</tt><a class="headerlink" href="#sqlalchemy.orm.exc.MultipleResultsFound" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="../core/exceptions.html#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 single database result was required but more than one were found.</p> </dd></dl> <dl class="data"> <dt id="sqlalchemy.orm.exc.NO_STATE"> <tt class="descclassname">sqlalchemy.orm.exc.</tt><tt class="descname">NO_STATE</tt><a class="headerlink" href="#sqlalchemy.orm.exc.NO_STATE" title="Permalink to this definition">¶</a></dt> <dd><p>Exception types that may be raised by instrumentation implementations.</p> </dd></dl> <dl class="exception"> <dt id="sqlalchemy.orm.exc.NoResultFound"> <em class="property">exception </em><tt class="descclassname">sqlalchemy.orm.exc.</tt><tt class="descname">NoResultFound</tt><a class="headerlink" href="#sqlalchemy.orm.exc.NoResultFound" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="../core/exceptions.html#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 database result was required but none was found.</p> </dd></dl> <dl class="exception"> <dt id="sqlalchemy.orm.exc.ObjectDeletedError"> <em class="property">exception </em><tt class="descclassname">sqlalchemy.orm.exc.</tt><tt class="descname">ObjectDeletedError</tt><a class="headerlink" href="#sqlalchemy.orm.exc.ObjectDeletedError" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="../core/exceptions.html#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 refresh() operation failed to re-retrieve an object’s row.</p> </dd></dl> <dl class="exception"> <dt id="sqlalchemy.orm.exc.StaleDataError"> <em class="property">exception </em><tt class="descclassname">sqlalchemy.orm.exc.</tt><tt class="descname">StaleDataError</tt><a class="headerlink" href="#sqlalchemy.orm.exc.StaleDataError" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="../core/exceptions.html#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>An operation encountered database state that is unaccounted for.</p> <p>Two conditions cause this to happen:</p> <ul class="simple"> <li>A flush may have attempted to update or delete rows and an unexpected number of rows were matched during the UPDATE or DELETE statement. Note that when version_id_col is used, rows in UPDATE or DELETE statements are also matched against the current known version identifier.</li> <li>A mapped object with version_id_col was refreshed, and the version number coming back from the database does not match that of the object itself.</li> </ul> </dd></dl> <dl class="exception"> <dt id="sqlalchemy.orm.exc.UnmappedClassError"> <em class="property">exception </em><tt class="descclassname">sqlalchemy.orm.exc.</tt><tt class="descname">UnmappedClassError</tt><big>(</big><em>cls</em>, <em>msg=None</em><big>)</big><a class="headerlink" href="#sqlalchemy.orm.exc.UnmappedClassError" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="#sqlalchemy.orm.exc.UnmappedError" title="sqlalchemy.orm.exc.UnmappedError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.orm.exc.UnmappedError</span></tt></a></p> <p>An mapping operation was requested for an unknown class.</p> </dd></dl> <dl class="exception"> <dt id="sqlalchemy.orm.exc.UnmappedColumnError"> <em class="property">exception </em><tt class="descclassname">sqlalchemy.orm.exc.</tt><tt class="descname">UnmappedColumnError</tt><a class="headerlink" href="#sqlalchemy.orm.exc.UnmappedColumnError" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="../core/exceptions.html#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>Mapping operation was requested on an unknown column.</p> </dd></dl> <dl class="exception"> <dt id="sqlalchemy.orm.exc.UnmappedError"> <em class="property">exception </em><tt class="descclassname">sqlalchemy.orm.exc.</tt><tt class="descname">UnmappedError</tt><a class="headerlink" href="#sqlalchemy.orm.exc.UnmappedError" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="../core/exceptions.html#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>Base for exceptions that involve expected mappings not present.</p> </dd></dl> <dl class="exception"> <dt id="sqlalchemy.orm.exc.UnmappedInstanceError"> <em class="property">exception </em><tt class="descclassname">sqlalchemy.orm.exc.</tt><tt class="descname">UnmappedInstanceError</tt><big>(</big><em>obj</em>, <em>msg=None</em><big>)</big><a class="headerlink" href="#sqlalchemy.orm.exc.UnmappedInstanceError" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="#sqlalchemy.orm.exc.UnmappedError" title="sqlalchemy.orm.exc.UnmappedError"><tt class="xref py py-class docutils literal"><span class="pre">sqlalchemy.orm.exc.UnmappedError</span></tt></a></p> <p>An mapping operation was requested for an unknown instance.</p> </dd></dl> </div> </div> </div> <div class="bottomnav"> Previous: <a href="examples.html" title="previous chapter">Examples</a> Next: <a href="../core/index.html" title="next chapter">SQLAlchemy Core</a> <div class="doc_copyright"> © <a href="../copyright.html">Copyright</a> 2007-2011, the SQLAlchemy authors and contributors. 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