Edit File: ddl.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>DDL Internals — Alembic 0.8.3 documentation</title> <link rel="stylesheet" href="../_static/nature_override.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <link rel="stylesheet" href="../_static/changelog.css" type="text/css" /> <link rel="stylesheet" href="../_static/sphinx_paramlinks.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '0.8.3', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </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> <link rel="top" title="Alembic 0.8.3 documentation" href="../index.html" /> <link rel="up" title="API Details" href="index.html" /> <link rel="next" title="Changelog" href="../changelog.html" /> <link rel="prev" title="Script Directory" href="script.html" /> </head> <body role="document"> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="../changelog.html" title="Changelog" accesskey="N">next</a> |</li> <li class="right" > <a href="script.html" title="Script Directory" accesskey="P">previous</a> |</li> <li class="nav-item nav-item-0"><a href="../index.html">Alembic 0.8.3 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="index.html" accesskey="U">API Details</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="ddl-internals"> <span id="alembic-ddl-toplevel"></span><h1>DDL Internals<a class="headerlink" href="#ddl-internals" title="Permalink to this headline">¶</a></h1> <p>These are some of the constructs used to generate migration instructions. The APIs here build off of the <a class="reference external" href="http://www.sqlalchemy.org/docs/core/ddl.html#sqlalchemy.schema.DDLElement" title="(in SQLAlchemy v1.0)"><code class="xref py py-class docutils literal"><span class="pre">sqlalchemy.schema.DDLElement</span></code></a> and <a class="reference external" href="http://www.sqlalchemy.org/docs/core/compiler.html#sqlalchemy-ext-compiler-toplevel" title="(in SQLAlchemy v1.0)"><span>Custom SQL Constructs and Compilation Extension</span></a> systems.</p> <p>For programmatic usage of Alembic’s migration directives, the easiest route is to use the higher level functions given by <a class="reference internal" href="operations.html#alembic-operations-toplevel"><span>Operation Directives</span></a>.</p> <span class="target" id="module-alembic.ddl"></span><span class="target" id="module-alembic.ddl.base"></span><dl class="class"> <dt id="alembic.ddl.base.AddColumn"> <em class="property">class </em><code class="descclassname">alembic.ddl.base.</code><code class="descname">AddColumn</code><span class="sig-paren">(</span><em>name</em>, <em>column</em>, <em>schema=None</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.AddColumn" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="class"> <dt id="alembic.ddl.base.AlterColumn"> <em class="property">class </em><code class="descclassname">alembic.ddl.base.</code><code class="descname">AlterColumn</code><span class="sig-paren">(</span><em>name</em>, <em>column_name</em>, <em>schema=None</em>, <em>existing_type=None</em>, <em>existing_nullable=None</em>, <em>existing_server_default=None</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.AlterColumn" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="class"> <dt id="alembic.ddl.base.AlterTable"> <em class="property">class </em><code class="descclassname">alembic.ddl.base.</code><code class="descname">AlterTable</code><span class="sig-paren">(</span><em>table_name</em>, <em>schema=None</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.AlterTable" title="Permalink to this definition">¶</a></dt> <dd><p>Represent an ALTER TABLE statement.</p> <p>Only the string name and optional schema name of the table is required, not a full Table object.</p> </dd></dl> <dl class="class"> <dt id="alembic.ddl.base.ColumnDefault"> <em class="property">class </em><code class="descclassname">alembic.ddl.base.</code><code class="descname">ColumnDefault</code><span class="sig-paren">(</span><em>name</em>, <em>column_name</em>, <em>default</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.ColumnDefault" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="class"> <dt id="alembic.ddl.base.ColumnName"> <em class="property">class </em><code class="descclassname">alembic.ddl.base.</code><code class="descname">ColumnName</code><span class="sig-paren">(</span><em>name</em>, <em>column_name</em>, <em>newname</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.ColumnName" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="class"> <dt id="alembic.ddl.base.ColumnNullable"> <em class="property">class </em><code class="descclassname">alembic.ddl.base.</code><code class="descname">ColumnNullable</code><span class="sig-paren">(</span><em>name</em>, <em>column_name</em>, <em>nullable</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.ColumnNullable" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="class"> <dt id="alembic.ddl.base.ColumnType"> <em class="property">class </em><code class="descclassname">alembic.ddl.base.</code><code class="descname">ColumnType</code><span class="sig-paren">(</span><em>name</em>, <em>column_name</em>, <em>type_</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.ColumnType" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="class"> <dt id="alembic.ddl.base.DropColumn"> <em class="property">class </em><code class="descclassname">alembic.ddl.base.</code><code class="descname">DropColumn</code><span class="sig-paren">(</span><em>name</em>, <em>column</em>, <em>schema=None</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.DropColumn" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="class"> <dt id="alembic.ddl.base.RenameTable"> <em class="property">class </em><code class="descclassname">alembic.ddl.base.</code><code class="descname">RenameTable</code><span class="sig-paren">(</span><em>old_table_name</em>, <em>new_table_name</em>, <em>schema=None</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.RenameTable" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.add_column"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">add_column</code><span class="sig-paren">(</span><em>compiler</em>, <em>column</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.add_column" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.alter_column"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">alter_column</code><span class="sig-paren">(</span><em>compiler</em>, <em>name</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.alter_column" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.alter_table"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">alter_table</code><span class="sig-paren">(</span><em>compiler</em>, <em>name</em>, <em>schema</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.alter_table" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.drop_column"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">drop_column</code><span class="sig-paren">(</span><em>compiler</em>, <em>name</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.drop_column" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.format_column_name"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">format_column_name</code><span class="sig-paren">(</span><em>compiler</em>, <em>name</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.format_column_name" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.format_server_default"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">format_server_default</code><span class="sig-paren">(</span><em>compiler</em>, <em>default</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.format_server_default" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.format_table_name"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">format_table_name</code><span class="sig-paren">(</span><em>compiler</em>, <em>name</em>, <em>schema</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.format_table_name" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.format_type"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">format_type</code><span class="sig-paren">(</span><em>compiler</em>, <em>type_</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.format_type" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.quote_dotted"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">quote_dotted</code><span class="sig-paren">(</span><em>name</em>, <em>quote</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.quote_dotted" title="Permalink to this definition">¶</a></dt> <dd><p>quote the elements of a dotted name</p> </dd></dl> <dl class="function"> <dt id="alembic.ddl.base.visit_add_column"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">visit_add_column</code><span class="sig-paren">(</span><em>element</em>, <em>compiler</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.visit_add_column" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.visit_column_default"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">visit_column_default</code><span class="sig-paren">(</span><em>element</em>, <em>compiler</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.visit_column_default" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.visit_column_name"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">visit_column_name</code><span class="sig-paren">(</span><em>element</em>, <em>compiler</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.visit_column_name" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.visit_column_nullable"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">visit_column_nullable</code><span class="sig-paren">(</span><em>element</em>, <em>compiler</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.visit_column_nullable" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.visit_column_type"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">visit_column_type</code><span class="sig-paren">(</span><em>element</em>, <em>compiler</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.visit_column_type" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.visit_drop_column"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">visit_drop_column</code><span class="sig-paren">(</span><em>element</em>, <em>compiler</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.visit_drop_column" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.base.visit_rename_table"> <code class="descclassname">alembic.ddl.base.</code><code class="descname">visit_rename_table</code><span class="sig-paren">(</span><em>element</em>, <em>compiler</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.base.visit_rename_table" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <span class="target" id="module-alembic.ddl.impl"></span><dl class="class"> <dt id="alembic.ddl.impl.DefaultImpl"> <em class="property">class </em><code class="descclassname">alembic.ddl.impl.</code><code class="descname">DefaultImpl</code><span class="sig-paren">(</span><em>dialect</em>, <em>connection</em>, <em>as_sql</em>, <em>transactional_ddl</em>, <em>output_buffer</em>, <em>context_opts</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl" title="Permalink to this definition">¶</a></dt> <dd><p>Provide the entrypoint for major migration operations, including database-specific behavioral variances.</p> <p>While individual SQL/DDL constructs already provide for database-specific implementations, variances here allow for entirely different sequences of operations to take place for a particular migration, such as SQL Server’s special ‘IDENTITY INSERT’ step for bulk inserts.</p> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.add_column"> <code class="descname">add_column</code><span class="sig-paren">(</span><em>table_name</em>, <em>column</em>, <em>schema=None</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.add_column" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.add_constraint"> <code class="descname">add_constraint</code><span class="sig-paren">(</span><em>const</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.add_constraint" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.alter_column"> <code class="descname">alter_column</code><span class="sig-paren">(</span><em>table_name</em>, <em>column_name</em>, <em>nullable=None</em>, <em>server_default=False</em>, <em>name=None</em>, <em>type_=None</em>, <em>schema=None</em>, <em>autoincrement=None</em>, <em>existing_type=None</em>, <em>existing_server_default=None</em>, <em>existing_nullable=None</em>, <em>existing_autoincrement=None</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.alter_column" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.autogen_column_reflect"> <code class="descname">autogen_column_reflect</code><span class="sig-paren">(</span><em>inspector</em>, <em>table</em>, <em>column_info</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.autogen_column_reflect" title="Permalink to this definition">¶</a></dt> <dd><p>A hook that is attached to the ‘column_reflect’ event for when a Table is reflected from the database during the autogenerate process.</p> <p>Dialects can elect to modify the information gathered here.</p> </dd></dl> <dl class="attribute"> <dt id="alembic.ddl.impl.DefaultImpl.bind"> <code class="descname">bind</code><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.bind" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.bulk_insert"> <code class="descname">bulk_insert</code><span class="sig-paren">(</span><em>table</em>, <em>rows</em>, <em>multiinsert=True</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.bulk_insert" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="attribute"> <dt id="alembic.ddl.impl.DefaultImpl.command_terminator"> <code class="descname">command_terminator</code><em class="property"> = ';'</em><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.command_terminator" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.compare_server_default"> <code class="descname">compare_server_default</code><span class="sig-paren">(</span><em>inspector_column</em>, <em>metadata_column</em>, <em>rendered_metadata_default</em>, <em>rendered_inspector_default</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.compare_server_default" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.compare_type"> <code class="descname">compare_type</code><span class="sig-paren">(</span><em>inspector_column</em>, <em>metadata_column</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.compare_type" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.correct_for_autogen_constraints"> <code class="descname">correct_for_autogen_constraints</code><span class="sig-paren">(</span><em>conn_uniques</em>, <em>conn_indexes</em>, <em>metadata_unique_constraints</em>, <em>metadata_indexes</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.correct_for_autogen_constraints" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.correct_for_autogen_foreignkeys"> <code class="descname">correct_for_autogen_foreignkeys</code><span class="sig-paren">(</span><em>conn_fks</em>, <em>metadata_fks</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.correct_for_autogen_foreignkeys" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.create_index"> <code class="descname">create_index</code><span class="sig-paren">(</span><em>index</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.create_index" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.create_table"> <code class="descname">create_table</code><span class="sig-paren">(</span><em>table</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.create_table" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.drop_column"> <code class="descname">drop_column</code><span class="sig-paren">(</span><em>table_name</em>, <em>column</em>, <em>schema=None</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.drop_column" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.drop_constraint"> <code class="descname">drop_constraint</code><span class="sig-paren">(</span><em>const</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.drop_constraint" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.drop_index"> <code class="descname">drop_index</code><span class="sig-paren">(</span><em>index</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.drop_index" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.drop_table"> <code class="descname">drop_table</code><span class="sig-paren">(</span><em>table</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.drop_table" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.emit_begin"> <code class="descname">emit_begin</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.emit_begin" title="Permalink to this definition">¶</a></dt> <dd><p>Emit the string <code class="docutils literal"><span class="pre">BEGIN</span></code>, or the backend-specific equivalent, on the current connection context.</p> <p>This is used in offline mode and typically via <a class="reference internal" href="runtime.html#alembic.runtime.environment.EnvironmentContext.begin_transaction" title="alembic.runtime.environment.EnvironmentContext.begin_transaction"><code class="xref py py-meth docutils literal"><span class="pre">EnvironmentContext.begin_transaction()</span></code></a>.</p> </dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.emit_commit"> <code class="descname">emit_commit</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.emit_commit" title="Permalink to this definition">¶</a></dt> <dd><p>Emit the string <code class="docutils literal"><span class="pre">COMMIT</span></code>, or the backend-specific equivalent, on the current connection context.</p> <p>This is used in offline mode and typically via <a class="reference internal" href="runtime.html#alembic.runtime.environment.EnvironmentContext.begin_transaction" title="alembic.runtime.environment.EnvironmentContext.begin_transaction"><code class="xref py py-meth docutils literal"><span class="pre">EnvironmentContext.begin_transaction()</span></code></a>.</p> </dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.execute"> <code class="descname">execute</code><span class="sig-paren">(</span><em>sql</em>, <em>execution_options=None</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.execute" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="classmethod"> <dt id="alembic.ddl.impl.DefaultImpl.get_by_dialect"> <em class="property">classmethod </em><code class="descname">get_by_dialect</code><span class="sig-paren">(</span><em>dialect</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.get_by_dialect" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.prep_table_for_batch"> <code class="descname">prep_table_for_batch</code><span class="sig-paren">(</span><em>table</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.prep_table_for_batch" title="Permalink to this definition">¶</a></dt> <dd><p>perform any operations needed on a table before a new one is created to replace it in batch mode.</p> <p>the PG dialect uses this to drop constraints on the table before the new one uses those same names.</p> </dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.rename_table"> <code class="descname">rename_table</code><span class="sig-paren">(</span><em>old_table_name</em>, <em>new_table_name</em>, <em>schema=None</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.rename_table" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.requires_recreate_in_batch"> <code class="descname">requires_recreate_in_batch</code><span class="sig-paren">(</span><em>batch_op</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.requires_recreate_in_batch" title="Permalink to this definition">¶</a></dt> <dd><p>Return True if the given <code class="xref py py-class docutils literal"><span class="pre">BatchOperationsImpl</span></code> would need the table to be recreated and copied in order to proceed.</p> <p>Normally, only returns True on SQLite when operations other than add_column are present.</p> </dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.start_migrations"> <code class="descname">start_migrations</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.start_migrations" title="Permalink to this definition">¶</a></dt> <dd><p>A hook called when <a class="reference internal" href="runtime.html#alembic.runtime.environment.EnvironmentContext.run_migrations" title="alembic.runtime.environment.EnvironmentContext.run_migrations"><code class="xref py py-meth docutils literal"><span class="pre">EnvironmentContext.run_migrations()</span></code></a> is called.</p> <p>Implementations can set up per-migration-run state here.</p> </dd></dl> <dl class="method"> <dt id="alembic.ddl.impl.DefaultImpl.static_output"> <code class="descname">static_output</code><span class="sig-paren">(</span><em>text</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.static_output" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="attribute"> <dt id="alembic.ddl.impl.DefaultImpl.transactional_ddl"> <code class="descname">transactional_ddl</code><em class="property"> = False</em><a class="headerlink" href="#alembic.ddl.impl.DefaultImpl.transactional_ddl" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> </dd></dl> <dl class="class"> <dt id="alembic.ddl.impl.ImplMeta"> <em class="property">class </em><code class="descclassname">alembic.ddl.impl.</code><code class="descname">ImplMeta</code><span class="sig-paren">(</span><em>classname</em>, <em>bases</em>, <em>dict_</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.impl.ImplMeta" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <div class="section" id="module-alembic.ddl.mysql"> <span id="mysql"></span><h2>MySQL<a class="headerlink" href="#module-alembic.ddl.mysql" title="Permalink to this headline">¶</a></h2> <dl class="class"> <dt id="alembic.ddl.mysql.MySQLAlterDefault"> <em class="property">class </em><code class="descclassname">alembic.ddl.mysql.</code><code class="descname">MySQLAlterDefault</code><span class="sig-paren">(</span><em>name</em>, <em>column_name</em>, <em>default</em>, <em>schema=None</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mysql.MySQLAlterDefault" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="#alembic.ddl.base.AlterColumn" title="alembic.ddl.base.AlterColumn"><code class="xref py py-class docutils literal"><span class="pre">alembic.ddl.base.AlterColumn</span></code></a></p> </dd></dl> <dl class="class"> <dt id="alembic.ddl.mysql.MySQLChangeColumn"> <em class="property">class </em><code class="descclassname">alembic.ddl.mysql.</code><code class="descname">MySQLChangeColumn</code><span class="sig-paren">(</span><em>name</em>, <em>column_name</em>, <em>schema=None</em>, <em>newname=None</em>, <em>type_=None</em>, <em>nullable=None</em>, <em>default=False</em>, <em>autoincrement=None</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mysql.MySQLChangeColumn" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="#alembic.ddl.base.AlterColumn" title="alembic.ddl.base.AlterColumn"><code class="xref py py-class docutils literal"><span class="pre">alembic.ddl.base.AlterColumn</span></code></a></p> </dd></dl> <dl class="class"> <dt id="alembic.ddl.mysql.MySQLImpl"> <em class="property">class </em><code class="descclassname">alembic.ddl.mysql.</code><code class="descname">MySQLImpl</code><span class="sig-paren">(</span><em>dialect</em>, <em>connection</em>, <em>as_sql</em>, <em>transactional_ddl</em>, <em>output_buffer</em>, <em>context_opts</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mysql.MySQLImpl" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="#alembic.ddl.impl.DefaultImpl" title="alembic.ddl.impl.DefaultImpl"><code class="xref py py-class docutils literal"><span class="pre">alembic.ddl.impl.DefaultImpl</span></code></a></p> <dl class="method"> <dt id="alembic.ddl.mysql.MySQLImpl.alter_column"> <code class="descname">alter_column</code><span class="sig-paren">(</span><em>table_name</em>, <em>column_name</em>, <em>nullable=None</em>, <em>server_default=False</em>, <em>name=None</em>, <em>type_=None</em>, <em>schema=None</em>, <em>existing_type=None</em>, <em>existing_server_default=None</em>, <em>existing_nullable=None</em>, <em>autoincrement=None</em>, <em>existing_autoincrement=None</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mysql.MySQLImpl.alter_column" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.mysql.MySQLImpl.compare_server_default"> <code class="descname">compare_server_default</code><span class="sig-paren">(</span><em>inspector_column</em>, <em>metadata_column</em>, <em>rendered_metadata_default</em>, <em>rendered_inspector_default</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mysql.MySQLImpl.compare_server_default" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.mysql.MySQLImpl.correct_for_autogen_constraints"> <code class="descname">correct_for_autogen_constraints</code><span class="sig-paren">(</span><em>conn_unique_constraints</em>, <em>conn_indexes</em>, <em>metadata_unique_constraints</em>, <em>metadata_indexes</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mysql.MySQLImpl.correct_for_autogen_constraints" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.mysql.MySQLImpl.correct_for_autogen_foreignkeys"> <code class="descname">correct_for_autogen_foreignkeys</code><span class="sig-paren">(</span><em>conn_fks</em>, <em>metadata_fks</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mysql.MySQLImpl.correct_for_autogen_foreignkeys" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="attribute"> <dt id="alembic.ddl.mysql.MySQLImpl.transactional_ddl"> <code class="descname">transactional_ddl</code><em class="property"> = False</em><a class="headerlink" href="#alembic.ddl.mysql.MySQLImpl.transactional_ddl" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> </dd></dl> <dl class="class"> <dt id="alembic.ddl.mysql.MySQLModifyColumn"> <em class="property">class </em><code class="descclassname">alembic.ddl.mysql.</code><code class="descname">MySQLModifyColumn</code><span class="sig-paren">(</span><em>name</em>, <em>column_name</em>, <em>schema=None</em>, <em>newname=None</em>, <em>type_=None</em>, <em>nullable=None</em>, <em>default=False</em>, <em>autoincrement=None</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mysql.MySQLModifyColumn" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="#alembic.ddl.mysql.MySQLChangeColumn" title="alembic.ddl.mysql.MySQLChangeColumn"><code class="xref py py-class docutils literal"><span class="pre">alembic.ddl.mysql.MySQLChangeColumn</span></code></a></p> </dd></dl> </div> <div class="section" id="module-alembic.ddl.mssql"> <span id="ms-sql"></span><h2>MS-SQL<a class="headerlink" href="#module-alembic.ddl.mssql" title="Permalink to this headline">¶</a></h2> <dl class="class"> <dt id="alembic.ddl.mssql.MSSQLImpl"> <em class="property">class </em><code class="descclassname">alembic.ddl.mssql.</code><code class="descname">MSSQLImpl</code><span class="sig-paren">(</span><em>*arg</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mssql.MSSQLImpl" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="#alembic.ddl.impl.DefaultImpl" title="alembic.ddl.impl.DefaultImpl"><code class="xref py py-class docutils literal"><span class="pre">alembic.ddl.impl.DefaultImpl</span></code></a></p> <dl class="method"> <dt id="alembic.ddl.mssql.MSSQLImpl.alter_column"> <code class="descname">alter_column</code><span class="sig-paren">(</span><em>table_name</em>, <em>column_name</em>, <em>nullable=None</em>, <em>server_default=False</em>, <em>name=None</em>, <em>type_=None</em>, <em>schema=None</em>, <em>existing_type=None</em>, <em>existing_server_default=None</em>, <em>existing_nullable=None</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mssql.MSSQLImpl.alter_column" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="attribute"> <dt id="alembic.ddl.mssql.MSSQLImpl.batch_separator"> <code class="descname">batch_separator</code><em class="property"> = 'GO'</em><a class="headerlink" href="#alembic.ddl.mssql.MSSQLImpl.batch_separator" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.mssql.MSSQLImpl.bulk_insert"> <code class="descname">bulk_insert</code><span class="sig-paren">(</span><em>table</em>, <em>rows</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mssql.MSSQLImpl.bulk_insert" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.mssql.MSSQLImpl.drop_column"> <code class="descname">drop_column</code><span class="sig-paren">(</span><em>table_name</em>, <em>column</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mssql.MSSQLImpl.drop_column" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.mssql.MSSQLImpl.emit_begin"> <code class="descname">emit_begin</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mssql.MSSQLImpl.emit_begin" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.mssql.MSSQLImpl.emit_commit"> <code class="descname">emit_commit</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mssql.MSSQLImpl.emit_commit" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="attribute"> <dt id="alembic.ddl.mssql.MSSQLImpl.transactional_ddl"> <code class="descname">transactional_ddl</code><em class="property"> = True</em><a class="headerlink" href="#alembic.ddl.mssql.MSSQLImpl.transactional_ddl" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> </dd></dl> <dl class="function"> <dt id="alembic.ddl.mssql.mssql_add_column"> <code class="descclassname">alembic.ddl.mssql.</code><code class="descname">mssql_add_column</code><span class="sig-paren">(</span><em>compiler</em>, <em>column</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mssql.mssql_add_column" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.mssql.visit_add_column"> <code class="descclassname">alembic.ddl.mssql.</code><code class="descname">visit_add_column</code><span class="sig-paren">(</span><em>element</em>, <em>compiler</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mssql.visit_add_column" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.mssql.visit_column_default"> <code class="descclassname">alembic.ddl.mssql.</code><code class="descname">visit_column_default</code><span class="sig-paren">(</span><em>element</em>, <em>compiler</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mssql.visit_column_default" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.mssql.visit_column_nullable"> <code class="descclassname">alembic.ddl.mssql.</code><code class="descname">visit_column_nullable</code><span class="sig-paren">(</span><em>element</em>, <em>compiler</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mssql.visit_column_nullable" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.mssql.visit_column_type"> <code class="descclassname">alembic.ddl.mssql.</code><code class="descname">visit_column_type</code><span class="sig-paren">(</span><em>element</em>, <em>compiler</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mssql.visit_column_type" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.mssql.visit_rename_column"> <code class="descclassname">alembic.ddl.mssql.</code><code class="descname">visit_rename_column</code><span class="sig-paren">(</span><em>element</em>, <em>compiler</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mssql.visit_rename_column" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="function"> <dt id="alembic.ddl.mssql.visit_rename_table"> <code class="descclassname">alembic.ddl.mssql.</code><code class="descname">visit_rename_table</code><span class="sig-paren">(</span><em>element</em>, <em>compiler</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.mssql.visit_rename_table" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> </div> <div class="section" id="module-alembic.ddl.postgresql"> <span id="postgresql"></span><h2>Postgresql<a class="headerlink" href="#module-alembic.ddl.postgresql" title="Permalink to this headline">¶</a></h2> <dl class="class"> <dt id="alembic.ddl.postgresql.PostgresqlImpl"> <em class="property">class </em><code class="descclassname">alembic.ddl.postgresql.</code><code class="descname">PostgresqlImpl</code><span class="sig-paren">(</span><em>dialect</em>, <em>connection</em>, <em>as_sql</em>, <em>transactional_ddl</em>, <em>output_buffer</em>, <em>context_opts</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.postgresql.PostgresqlImpl" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="#alembic.ddl.impl.DefaultImpl" title="alembic.ddl.impl.DefaultImpl"><code class="xref py py-class docutils literal"><span class="pre">alembic.ddl.impl.DefaultImpl</span></code></a></p> <dl class="method"> <dt id="alembic.ddl.postgresql.PostgresqlImpl.autogen_column_reflect"> <code class="descname">autogen_column_reflect</code><span class="sig-paren">(</span><em>inspector</em>, <em>table</em>, <em>column_info</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.postgresql.PostgresqlImpl.autogen_column_reflect" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.postgresql.PostgresqlImpl.compare_server_default"> <code class="descname">compare_server_default</code><span class="sig-paren">(</span><em>inspector_column</em>, <em>metadata_column</em>, <em>rendered_metadata_default</em>, <em>rendered_inspector_default</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.postgresql.PostgresqlImpl.compare_server_default" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.postgresql.PostgresqlImpl.correct_for_autogen_constraints"> <code class="descname">correct_for_autogen_constraints</code><span class="sig-paren">(</span><em>conn_unique_constraints</em>, <em>conn_indexes</em>, <em>metadata_unique_constraints</em>, <em>metadata_indexes</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.postgresql.PostgresqlImpl.correct_for_autogen_constraints" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.postgresql.PostgresqlImpl.prep_table_for_batch"> <code class="descname">prep_table_for_batch</code><span class="sig-paren">(</span><em>table</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.postgresql.PostgresqlImpl.prep_table_for_batch" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="attribute"> <dt id="alembic.ddl.postgresql.PostgresqlImpl.transactional_ddl"> <code class="descname">transactional_ddl</code><em class="property"> = True</em><a class="headerlink" href="#alembic.ddl.postgresql.PostgresqlImpl.transactional_ddl" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> </dd></dl> <dl class="function"> <dt id="alembic.ddl.postgresql.visit_rename_table"> <code class="descclassname">alembic.ddl.postgresql.</code><code class="descname">visit_rename_table</code><span class="sig-paren">(</span><em>element</em>, <em>compiler</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.postgresql.visit_rename_table" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> </div> <div class="section" id="module-alembic.ddl.sqlite"> <span id="sqlite"></span><h2>SQLite<a class="headerlink" href="#module-alembic.ddl.sqlite" title="Permalink to this headline">¶</a></h2> <dl class="class"> <dt id="alembic.ddl.sqlite.SQLiteImpl"> <em class="property">class </em><code class="descclassname">alembic.ddl.sqlite.</code><code class="descname">SQLiteImpl</code><span class="sig-paren">(</span><em>dialect</em>, <em>connection</em>, <em>as_sql</em>, <em>transactional_ddl</em>, <em>output_buffer</em>, <em>context_opts</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.sqlite.SQLiteImpl" title="Permalink to this definition">¶</a></dt> <dd><p>Bases: <a class="reference internal" href="#alembic.ddl.impl.DefaultImpl" title="alembic.ddl.impl.DefaultImpl"><code class="xref py py-class docutils literal"><span class="pre">alembic.ddl.impl.DefaultImpl</span></code></a></p> <dl class="method"> <dt id="alembic.ddl.sqlite.SQLiteImpl.add_constraint"> <code class="descname">add_constraint</code><span class="sig-paren">(</span><em>const</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.sqlite.SQLiteImpl.add_constraint" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.sqlite.SQLiteImpl.compare_server_default"> <code class="descname">compare_server_default</code><span class="sig-paren">(</span><em>inspector_column</em>, <em>metadata_column</em>, <em>rendered_metadata_default</em>, <em>rendered_inspector_default</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.sqlite.SQLiteImpl.compare_server_default" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.sqlite.SQLiteImpl.correct_for_autogen_constraints"> <code class="descname">correct_for_autogen_constraints</code><span class="sig-paren">(</span><em>conn_unique_constraints</em>, <em>conn_indexes</em>, <em>metadata_unique_constraints</em>, <em>metadata_indexes</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.sqlite.SQLiteImpl.correct_for_autogen_constraints" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.sqlite.SQLiteImpl.drop_constraint"> <code class="descname">drop_constraint</code><span class="sig-paren">(</span><em>const</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.sqlite.SQLiteImpl.drop_constraint" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="method"> <dt id="alembic.ddl.sqlite.SQLiteImpl.requires_recreate_in_batch"> <code class="descname">requires_recreate_in_batch</code><span class="sig-paren">(</span><em>batch_op</em><span class="sig-paren">)</span><a class="headerlink" href="#alembic.ddl.sqlite.SQLiteImpl.requires_recreate_in_batch" title="Permalink to this definition">¶</a></dt> <dd><p>Return True if the given <code class="xref py py-class docutils literal"><span class="pre">BatchOperationsImpl</span></code> would need the table to be recreated and copied in order to proceed.</p> <p>Normally, only returns True on SQLite when operations other than add_column are present.</p> </dd></dl> <dl class="attribute"> <dt id="alembic.ddl.sqlite.SQLiteImpl.transactional_ddl"> <code class="descname">transactional_ddl</code><em class="property"> = False</em><a class="headerlink" href="#alembic.ddl.sqlite.SQLiteImpl.transactional_ddl" title="Permalink to this definition">¶</a></dt> <dd><p>SQLite supports transactional DDL, but pysqlite does not: see: <a class="reference external" href="http://bugs.python.org/issue10740">http://bugs.python.org/issue10740</a></p> </dd></dl> </dd></dl> </div> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h3><a href="../index.html">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">DDL Internals</a><ul> <li><a class="reference internal" href="#module-alembic.ddl.mysql">MySQL</a></li> <li><a class="reference internal" href="#module-alembic.ddl.mssql">MS-SQL</a></li> <li><a class="reference internal" href="#module-alembic.ddl.postgresql">Postgresql</a></li> <li><a class="reference internal" 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