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| 8985 | </p> | 8985 | </p> |
| 8986 | </li> | 8986 | </li> |
| 8987 | <li><p·class="caption"·id="change-2.0.0b1-85"><span·class="target"·id="change-0a487b939ab3ad7ca93ee291b91eb410"><strong>[sqlite]·[usecase]</strong>·<a·class="changelog-reference·headerlink·reference·internal"·href="#change-0a487b939ab3ad7ca93ee291b91eb410">¶</a></span><p>Added·RETURNING·support·for·the·SQLite·dialect.··SQLite·supports·RETURNING | 8987 | <li><p·class="caption"·id="change-2.0.0b1-85"><span·class="target"·id="change-0a487b939ab3ad7ca93ee291b91eb410"><strong>[sqlite]·[usecase]</strong>·<a·class="changelog-reference·headerlink·reference·internal"·href="#change-0a487b939ab3ad7ca93ee291b91eb410">¶</a></span><p>Added·RETURNING·support·for·the·SQLite·dialect.··SQLite·supports·RETURNING |
| 8988 | since·version·3.35.</p> | 8988 | since·version·3.35.</p> |
| 8989 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/6195">#6195</a></p> | 8989 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/6195">#6195</a></p> |
| 8990 | </p> | 8990 | </p> |
| 8991 | </li> | 8991 | </li> |
| 8992 | <li><p·class="caption"·id="change-2.0.0b1-86"><span·class="target"·id="change-ef6ce799a34b30832a9c8115e2afa920"><strong>[sqlite]·[usecase]</strong>·<a·class="changelog-reference·headerlink·reference·internal"·href="#change-ef6ce799a34b30832a9c8115e2afa920">¶</a></span><p>The·SQLite·dialect·now·supports·UPDATE..FROM·syntax,·for·UPDATE·statements | ||
| 8993 | that·may·refer·to·additional·tables·within·the·WHERE·criteria·of·the | ||
| 8994 | statement·without·the·need·to·use·subqueries.·This·syntax·is·invoked | ||
| 8995 | automatically·when·using·the·<a·class="reference·internal"·href="../core/dml.html#sqlalchemy.sql.expression.Update"·title="sqlalchemy.sql.expression.Update"><code·class="xref·py·py-class·docutils·literal·notranslate"><span·class="pre">Update</span></code></a>·construct·when·more·than | ||
| 8996 | one·table·or·other·entity·or·selectable·is·used.</p> | ||
| 8997 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/7185">#7185</a></p> | ||
| 8998 | </p> | ||
| 8999 | </li> | ||
| 9000 | <li><p·class="caption"·id="change-2.0.0b1-8 | 8992 | <li><p·class="caption"·id="change-2.0.0b1-86"><span·class="target"·id="change-74fee584f531c832d0d97ea94be754b8"><strong>[sqlite]·[usecase]·[performance]</strong>·<a·class="changelog-reference·headerlink·reference·internal"·href="#change-74fee584f531c832d0d97ea94be754b8">¶</a></span><p>SQLite·datetime,·date,·and·time·datatypes·now·use·Python·standard·lib |
| 9001 | <code·class="docutils·literal·notranslate"><span·class="pre">fromisoformat()</span></code>·methods·in·order·to·parse·incoming·datetime,·date,·and | 8993 | <code·class="docutils·literal·notranslate"><span·class="pre">fromisoformat()</span></code>·methods·in·order·to·parse·incoming·datetime,·date,·and |
| 9002 | time·string·values.·This·improves·performance·vs.·the·previous·regular | 8994 | time·string·values.·This·improves·performance·vs.·the·previous·regular |
| 9003 | expression-based·approach,·and·also·automatically·accommodates·for·datetime | 8995 | expression-based·approach,·and·also·automatically·accommodates·for·datetime |
| 9004 | and·time·formats·that·contain·either·a·six-digit·“microseconds”·format·or·a | 8996 | and·time·formats·that·contain·either·a·six-digit·“microseconds”·format·or·a |
| 9005 | three-digit·“milliseconds”·format.</p> | 8997 | three-digit·“milliseconds”·format.</p> |
| 9006 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/7029">#7029</a></p> | 8998 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/7029">#7029</a></p> |
| 9007 | </p> | 8999 | </p> |
| 9008 | </li> | 9000 | </li> |
| 9001 | <li><p·class="caption"·id="change-2.0.0b1-87"><span·class="target"·id="change-ef6ce799a34b30832a9c8115e2afa920"><strong>[sqlite]·[usecase]</strong>·<a·class="changelog-reference·headerlink·reference·internal"·href="#change-ef6ce799a34b30832a9c8115e2afa920">¶</a></span><p>The·SQLite·dialect·now·supports·UPDATE..FROM·syntax,·for·UPDATE·statements | ||
| 9002 | that·may·refer·to·additional·tables·within·the·WHERE·criteria·of·the | ||
| 9003 | statement·without·the·need·to·use·subqueries.·This·syntax·is·invoked | ||
| 9004 | automatically·when·using·the·<a·class="reference·internal"·href="../core/dml.html#sqlalchemy.sql.expression.Update"·title="sqlalchemy.sql.expression.Update"><code·class="xref·py·py-class·docutils·literal·notranslate"><span·class="pre">Update</span></code></a>·construct·when·more·than | ||
| 9005 | one·table·or·other·entity·or·selectable·is·used.</p> | ||
| 9006 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/7185">#7185</a></p> | ||
| 9007 | </p> | ||
| 9008 | </li> | ||
| 9009 | <li><p·class="caption"·id="change-2.0.0b1-88"><span·class="target"·id="change-b11607250a6e056103e2b2d1205be1a8"><strong>[sqlite]·[bug]</strong>·<a·class="changelog-reference·headerlink·reference·internal"·href="#change-b11607250a6e056103e2b2d1205be1a8">¶</a></span><p>Removed·the·warning·that·emits·from·the·<a·class="reference·internal"·href="../core/type_basics.html#sqlalchemy.types.Numeric"·title="sqlalchemy.types.Numeric"><code·class="xref·py·py-class·docutils·literal·notranslate"><span·class="pre">Numeric</span></code></a>·type·about | 9009 | <li><p·class="caption"·id="change-2.0.0b1-88"><span·class="target"·id="change-b11607250a6e056103e2b2d1205be1a8"><strong>[sqlite]·[bug]</strong>·<a·class="changelog-reference·headerlink·reference·internal"·href="#change-b11607250a6e056103e2b2d1205be1a8">¶</a></span><p>Removed·the·warning·that·emits·from·the·<a·class="reference·internal"·href="../core/type_basics.html#sqlalchemy.types.Numeric"·title="sqlalchemy.types.Numeric"><code·class="xref·py·py-class·docutils·literal·notranslate"><span·class="pre">Numeric</span></code></a>·type·about |
| 9010 | DBAPIs·not·supporting·Decimal·values·natively.·This·warning·was·oriented | 9010 | DBAPIs·not·supporting·Decimal·values·natively.·This·warning·was·oriented |
| 9011 | towards·SQLite,·which·does·not·have·any·real·way·without·additional | 9011 | towards·SQLite,·which·does·not·have·any·real·way·without·additional |
| 9012 | extensions·or·workarounds·of·handling·precision·numeric·values·more·than·15 | 9012 | extensions·or·workarounds·of·handling·precision·numeric·values·more·than·15 |
| 9013 | significant·digits·as·it·only·uses·floating·point·math·to·represent | 9013 | significant·digits·as·it·only·uses·floating·point·math·to·represent |
| 9014 | numbers.·As·this·is·a·known·and·documented·limitation·in·SQLite·itself,·and | 9014 | numbers.·As·this·is·a·known·and·documented·limitation·in·SQLite·itself,·and |
| 9015 | not·a·quirk·of·the·pysqlite·driver,·there’s·no·need·for·SQLAlchemy·to·warn | 9015 | not·a·quirk·of·the·pysqlite·driver,·there’s·no·need·for·SQLAlchemy·to·warn |
| Offset 6178, 29 lines modified | Offset 6178, 29 lines modified | ||
| 6178 | ······See·also | 6178 | ······See·also |
| 6179 | ······_\x8R_\x8e_\x8f_\x8l_\x8e_\x8c_\x8t_\x8i_\x8n_\x8g_\x8·_\x8i_\x8n_\x8t_\x8e_\x8r_\x8n_\x8a_\x8l_\x8·_\x8s_\x8c_\x8h_\x8e_\x8m_\x8a_\x8·_\x8t_\x8a_\x8b_\x8l_\x8e_\x8s | 6179 | ······_\x8R_\x8e_\x8f_\x8l_\x8e_\x8c_\x8t_\x8i_\x8n_\x8g_\x8·_\x8i_\x8n_\x8t_\x8e_\x8r_\x8n_\x8a_\x8l_\x8·_\x8s_\x8c_\x8h_\x8e_\x8m_\x8a_\x8·_\x8t_\x8a_\x8b_\x8l_\x8e_\x8s |
| 6180 | ······References:·_\x8#_\x88_\x82_\x83_\x84 | 6180 | ······References:·_\x8#_\x88_\x82_\x83_\x84 |
| 6181 | [\x8[s\x8sq\x8ql\x8li\x8it\x8te\x8e]\x8]·[\x8[u\x8us\x8se\x8ec\x8ca\x8as\x8se\x8e]\x8]·_\x8¶ | 6181 | [\x8[s\x8sq\x8ql\x8li\x8it\x8te\x8e]\x8]·[\x8[u\x8us\x8se\x8ec\x8ca\x8as\x8se\x8e]\x8]·_\x8¶ |
| 6182 | Added·RETURNING·support·for·the·SQLite·dialect.·SQLite·supports·RETURNING·since | 6182 | Added·RETURNING·support·for·the·SQLite·dialect.·SQLite·supports·RETURNING·since |
| 6183 | version·3.35. | 6183 | version·3.35. |
| 6184 | References:·_\x8#_\x86_\x81_\x89_\x85 | 6184 | References:·_\x8#_\x86_\x81_\x89_\x85 |
| 6185 | [\x8[s\x8sq\x8ql\x8li\x8it\x8te\x8e]\x8]·[\x8[u\x8us\x8se\x8ec\x8ca\x8as\x8se\x8e]\x8]·[\x8[p\x8pe\x8er\x8rf\x8fo\x8or\x8rm\x8ma\x8an\x8nc\x8ce\x8e]\x8]·_\x8¶ | ||
| 6185 | [\x8[s\x8sq\x8ql\x8li\x8it\x8te\x8e]\x8]·[\x8[u\x8us\x8se\x8ec\x8ca\x8as\x8se\x8e]\x8]·_\x8¶ | ||
| 6186 | The·SQLite·dialect·now·supports·UPDATE..FROM·syntax,·for·UPDATE·statements·that | ||
| 6187 | may·refer·to·additional·tables·within·the·WHERE·criteria·of·the·statement | ||
| 6188 | without·the·need·to·use·subqueries.·This·syntax·is·invoked·automatically·when | ||
| 6189 | using·the·_\x8U_\x8p_\x8d_\x8a_\x8t_\x8e·construct·when·more·than·one·table·or·other·entity·or | ||
| 6190 | selectable·is·used. | ||
| 6191 | References:·_\x8#_\x87_\x81_\x88_\x85 | ||
| 6192 | [\x8[s\x8sq\x8ql\x8li\x8it\x8te\x8e]\x8]·[\x8[p\x8pe\x8er\x8rf\x8fo\x8or\x8rm\x8ma\x8an\x8nc\x8ce\x8e]\x8]·[\x8[u\x8us\x8se\x8ec\x8ca\x8as\x8se\x8e]\x8]·_\x8¶ | ||
| 6193 | SQLite·datetime,·date,·and·time·datatypes·now·use·Python·standard·lib | 6186 | SQLite·datetime,·date,·and·time·datatypes·now·use·Python·standard·lib |
| 6194 | fromisoformat()·methods·in·order·to·parse·incoming·datetime,·date,·and·time | 6187 | fromisoformat()·methods·in·order·to·parse·incoming·datetime,·date,·and·time |
| 6195 | string·values.·This·improves·performance·vs.·the·previous·regular·expression- | 6188 | string·values.·This·improves·performance·vs.·the·previous·regular·expression- |
| 6196 | based·approach,·and·also·automatically·accommodates·for·datetime·and·time | 6189 | based·approach,·and·also·automatically·accommodates·for·datetime·and·time |
| 6197 | formats·that·contain·either·a·six-digit·“microseconds”·format·or·a·three-digit | 6190 | formats·that·contain·either·a·six-digit·“microseconds”·format·or·a·three-digit |
| 6198 | “milliseconds”·format. | 6191 | “milliseconds”·format. |
| 6199 | References:·_\x8#_\x87_\x80_\x82_\x89 | 6192 | References:·_\x8#_\x87_\x80_\x82_\x89 |
| 6193 | [\x8[s\x8sq\x8ql\x8li\x8it\x8te\x8e]\x8]·[\x8[u\x8us\x8se\x8ec\x8ca\x8as\x8se\x8e]\x8]·_\x8¶ | ||
| 6194 | The·SQLite·dialect·now·supports·UPDATE..FROM·syntax,·for·UPDATE·statements·that | ||
| 6195 | may·refer·to·additional·tables·within·the·WHERE·criteria·of·the·statement | ||
| 6196 | without·the·need·to·use·subqueries.·This·syntax·is·invoked·automatically·when | ||
| 6197 | using·the·_\x8U_\x8p_\x8d_\x8a_\x8t_\x8e·construct·when·more·than·one·table·or·other·entity·or | ||
| 6198 | selectable·is·used. | ||
| 6199 | References:·_\x8#_\x87_\x81_\x88_\x85 | ||
| 6200 | [\x8[s\x8sq\x8ql\x8li\x8it\x8te\x8e]\x8]·[\x8[b\x8bu\x8ug\x8g]\x8]·_\x8¶ | 6200 | [\x8[s\x8sq\x8ql\x8li\x8it\x8te\x8e]\x8]·[\x8[b\x8bu\x8ug\x8g]\x8]·_\x8¶ |
| 6201 | Removed·the·warning·that·emits·from·the·_\x8N_\x8u_\x8m_\x8e_\x8r_\x8i_\x8c·type·about·DBAPIs·not | 6201 | Removed·the·warning·that·emits·from·the·_\x8N_\x8u_\x8m_\x8e_\x8r_\x8i_\x8c·type·about·DBAPIs·not |
| 6202 | supporting·Decimal·values·natively.·This·warning·was·oriented·towards·SQLite, | 6202 | supporting·Decimal·values·natively.·This·warning·was·oriented·towards·SQLite, |
| 6203 | which·does·not·have·any·real·way·without·additional·extensions·or·workarounds | 6203 | which·does·not·have·any·real·way·without·additional·extensions·or·workarounds |
| 6204 | of·handling·precision·numeric·values·more·than·15·significant·digits·as·it·only | 6204 | of·handling·precision·numeric·values·more·than·15·significant·digits·as·it·only |
| 6205 | uses·floating·point·math·to·represent·numbers.·As·this·is·a·known·and | 6205 | uses·floating·point·math·to·represent·numbers.·As·this·is·a·known·and |
| 6206 | documented·limitation·in·SQLite·itself,·and·not·a·quirk·of·the·pysqlite·driver, | 6206 | documented·limitation·in·SQLite·itself,·and·not·a·quirk·of·the·pysqlite·driver, |
| Offset 319, 29 lines modified | Offset 319, 29 lines modified | ||
| 319 | </ul> | 319 | </ul> |
| 320 | </p> | 320 | </p> |
| 321 | </section> | 321 | </section> |
| 322 | <section·id="module-examples.asyncio"> | 322 | <section·id="module-examples.asyncio"> |
| 323 | <span·id="asyncio-integration"></span><span·id="examples-asyncio"></span><h3>Asyncio·Integration<a·class="headerlink"·href="#module-examples.asyncio"·title="Link·to·this·heading">¶</a></h3> | 323 | <span·id="asyncio-integration"></span><span·id="examples-asyncio"></span><h3>Asyncio·Integration<a·class="headerlink"·href="#module-examples.asyncio"·title="Link·to·this·heading">¶</a></h3> |
| 324 | <p>Examples·illustrating·the·asyncio·engine·feature·of·SQLAlchemy.</p> | 324 | <p>Examples·illustrating·the·asyncio·engine·feature·of·SQLAlchemy.</p> |
| 325 | <p>Listing·of·files:<ul·class="simple"> | 325 | <p>Listing·of·files:<ul·class="simple"> |
| 326 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/greenlet_orm.html">greenlet_orm.py</a>·-·Illustrates·use·of·the·sqlalchemy.ext.asyncio.AsyncSession·object | ||
| 327 | for·asynchronous·ORM·use,·including·the·optional·run_sync()·method.</p> | ||
| 328 | </p></li> | ||
| 326 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/async_orm.html">async_orm.py</a>·-·Illustrates·use·of·the·<code·class="docutils·literal·notranslate"><span·class="pre">sqlalchemy.ext.asyncio.AsyncSession</span></code>·object | 329 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/async_orm.html">async_orm.py</a>·-·Illustrates·use·of·the·<code·class="docutils·literal·notranslate"><span·class="pre">sqlalchemy.ext.asyncio.AsyncSession</span></code>·object |
| 327 | for·asynchronous·ORM·use.</p> | 330 | for·asynchronous·ORM·use.</p> |
| 328 | </p></li> | 331 | </p></li> |
| 332 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/basic.html">basic.py</a>·-·Illustrates·the·asyncio·engine·/·connection·interface.</p> | ||
| 329 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/greenlet_orm.html">greenlet_orm.py</a>·-·Illustrates·use·of·the·sqlalchemy.ext.asyncio.AsyncSession·object | ||
| 330 | for·asynchronous·ORM·use,·including·the·optional·run_sync()·method.</p> | ||
| 331 | </p></li> | 333 | </p></li> |
| 332 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/gather_orm_statements.html">gather_orm_statements.py</a>·-·Illustrates·how·to·run·many·statements·concurrently·using·<code·class="docutils·literal·notranslate"><span·class="pre">asyncio.gather()</span></code> | 334 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/gather_orm_statements.html">gather_orm_statements.py</a>·-·Illustrates·how·to·run·many·statements·concurrently·using·<code·class="docutils·literal·notranslate"><span·class="pre">asyncio.gather()</span></code> |
| 333 | along·many·asyncio·database·connections,·merging·ORM·results·into·a·single | 335 | along·many·asyncio·database·connections,·merging·ORM·results·into·a·single |
| 334 | <code·class="docutils·literal·notranslate"><span·class="pre">AsyncSession</span></code>.</p> | 336 | <code·class="docutils·literal·notranslate"><span·class="pre">AsyncSession</span></code>.</p> |
| 335 | </p></li> | 337 | </p></li> |
| 336 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/async_orm_writeonly.html">async_orm_writeonly.py</a>·-·Illustrates·using·<strong>write·only·relationships</strong>·for·simpler·handling | 338 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/async_orm_writeonly.html">async_orm_writeonly.py</a>·-·Illustrates·using·<strong>write·only·relationships</strong>·for·simpler·handling |
| 337 | of·ORM·collections·under·asyncio.</p> | 339 | of·ORM·collections·under·asyncio.</p> |
| 338 | </p></li> | 340 | </p></li> |
| 339 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/basic.html">basic.py</a>·-·Illustrates·the·asyncio·engine·/·connection·interface.</p> | ||
| 340 | </p></li> | ||
| 341 | </ul> | 341 | </ul> |
| 342 | </p> | 342 | </p> |
| 343 | </section> | 343 | </section> |
| 344 | <section·id="module-examples.graphs"> | 344 | <section·id="module-examples.graphs"> |
| 345 | <span·id="directed-graphs"></span><h3>Directed·Graphs<a·class="headerlink"·href="#module-examples.graphs"·title="Link·to·this·heading">¶</a></h3> | 345 | <span·id="directed-graphs"></span><h3>Directed·Graphs<a·class="headerlink"·href="#module-examples.graphs"·title="Link·to·this·heading">¶</a></h3> |
| 346 | <p>An·example·of·persistence·for·a·directed·graph·structure.···The | 346 | <p>An·example·of·persistence·for·a·directed·graph·structure.···The |
| 347 | graph·is·stored·as·a·collection·of·edges,·each·referencing·both·a | 347 | graph·is·stored·as·a·collection·of·edges,·each·referencing·both·a |
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| 378 | subclassing·the·<code·class="docutils·literal·notranslate"><span·class="pre">HasAddresses</span></code>·mixin,·which·ensures·that·the | 378 | subclassing·the·<code·class="docutils·literal·notranslate"><span·class="pre">HasAddresses</span></code>·mixin,·which·ensures·that·the |
| 379 | parent·class·is·provided·with·an·<code·class="docutils·literal·notranslate"><span·class="pre">addresses</span></code>·collection | 379 | parent·class·is·provided·with·an·<code·class="docutils·literal·notranslate"><span·class="pre">addresses</span></code>·collection |
| 380 | which·contains·<code·class="docutils·literal·notranslate"><span·class="pre">Address</span></code>·objects.</p> | 380 | which·contains·<code·class="docutils·literal·notranslate"><span·class="pre">Address</span></code>·objects.</p> |
| 381 | <p>The·<a·class="reference·external"·href="../_modules/examples/generic_associations/discriminator_on_association.html">discriminator_on_association.py</a>·and·<a·class="reference·external"·href="../_modules/examples/generic_associations/generic_fk.html">generic_fk.py</a>·scripts | 381 | <p>The·<a·class="reference·external"·href="../_modules/examples/generic_associations/discriminator_on_association.html">discriminator_on_association.py</a>·and·<a·class="reference·external"·href="../_modules/examples/generic_associations/generic_fk.html">generic_fk.py</a>·scripts |
| 382 | are·modernized·versions·of·recipes·presented·in·the·2007·blog·post | 382 | are·modernized·versions·of·recipes·presented·in·the·2007·blog·post |
| 383 | <a·class="reference·external"·href="https://techspot.zzzeek.org/2007/05/29/polymorphic-associations-with-sqlalchemy/">Polymorphic·Associations·with·SQLAlchemy</a>.</p> | 383 | <a·class="reference·external"·href="https://techspot.zzzeek.org/2007/05/29/polymorphic-associations-with-sqlalchemy/">Polymorphic·Associations·with·SQLAlchemy</a>.</p> |
| 384 | <p>Listing·of·files:<ul·class="simple"> | 384 | <p>Listing·of·files:<ul·class="simple"> |
| 385 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/table_per_related.html">table_per_related.py</a>·-·Illustrates·a·generic·association·which·persists·association | ||
| 386 | objects·within·individual·tables,·each·one·generated·to·persist | ||
| 387 | those·objects·on·behalf·of·a·particular·parent·class.</p> | ||
| 388 | </p></li> | ||
| 385 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/discriminator_on_association.html">discriminator_on_association.py</a>·-·Illustrates·a·mixin·which·provides·a·generic·association | 389 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/discriminator_on_association.html">discriminator_on_association.py</a>·-·Illustrates·a·mixin·which·provides·a·generic·association |
| 386 | using·a·single·target·table·and·a·single·association·table, | 390 | using·a·single·target·table·and·a·single·association·table, |
| 387 | referred·to·by·all·parent·tables.··The·association·table | 391 | referred·to·by·all·parent·tables.··The·association·table |
| 388 | contains·a·“discriminator”·column·which·determines·what·type·of | 392 | contains·a·“discriminator”·column·which·determines·what·type·of |
| 389 | parent·object·associates·to·each·particular·row·in·the·association | 393 | parent·object·associates·to·each·particular·row·in·the·association |
| 390 | table.</p> | 394 | table.</p> |
| 391 | </p></li> | 395 | </p></li> |
| 396 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/table_per_association.html">table_per_association.py</a>·-·Illustrates·a·mixin·which·provides·a·generic·association | ||
| 397 | via·a·individually·generated·association·tables·for·each·parent·class. | ||
| 398 | The·associated·objects·themselves·are·persisted·in·a·single·table | ||
| 399 | shared·among·all·parents.</p> | ||
| 400 | </p></li> | ||
| 392 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/generic_fk.html">generic_fk.py</a>·-·Illustrates·a·so-called·“generic·foreign·key”,·in·a·similar·fashion | 401 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/generic_fk.html">generic_fk.py</a>·-·Illustrates·a·so-called·“generic·foreign·key”,·in·a·similar·fashion |
| 393 | to·that·of·popular·frameworks·such·as·Django,·ROR,·etc.··This | 402 | to·that·of·popular·frameworks·such·as·Django,·ROR,·etc.··This |
| 394 | approach·bypasses·standard·referential·integrity | 403 | approach·bypasses·standard·referential·integrity |
| 395 | practices,·in·that·the·“foreign·key”·column·is·not·actually | 404 | practices,·in·that·the·“foreign·key”·column·is·not·actually |
| 396 | constrained·to·refer·to·any·particular·table;·instead, | 405 | constrained·to·refer·to·any·particular·table;·instead, |
| 397 | in-application·logic·is·used·to·determine·which·table·is·referenced.</p> | 406 | in-application·logic·is·used·to·determine·which·table·is·referenced.</p> |
| 398 | </p></li> | 407 | </p></li> |
| 399 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/table_per_related.html">table_per_related.py</a>·-·Illustrates·a·generic·association·which·persists·association | ||
| 400 | objects·within·individual·tables,·each·one·generated·to·persist | ||
| 401 | those·objects·on·behalf·of·a·particular·parent·class.</p> | ||
| 402 | </p></li> | ||
| 403 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/table_per_association.html">table_per_association.py</a>·-·Illustrates·a·mixin·which·provides·a·generic·association | ||
| 404 | via·a·individually·generated·association·tables·for·each·parent·class. | ||
| 405 | The·associated·objects·themselves·are·persisted·in·a·single·table | ||
| 406 | shared·among·all·parents.</p> | ||
| 407 | </p></li> | ||
| 408 | </ul> | 408 | </ul> |
| 409 | </p> | 409 | </p> |
| 410 | </section> | 410 | </section> |
| 411 | <section·id="module-examples.materialized_paths"> | 411 | <section·id="module-examples.materialized_paths"> |
| 412 | <span·id="materialized-paths"></span><h3>Materialized·Paths<a·class="headerlink"·href="#module-examples.materialized_paths"·title="Link·to·this·heading">¶</a></h3> | 412 | <span·id="materialized-paths"></span><h3>Materialized·Paths<a·class="headerlink"·href="#module-examples.materialized_paths"·title="Link·to·this·heading">¶</a></h3> |
| 413 | <p>Illustrates·the·“materialized·paths”·pattern·for·hierarchical·data·using·the | 413 | <p>Illustrates·the·“materialized·paths”·pattern·for·hierarchical·data·using·the |
| 414 | SQLAlchemy·ORM.</p> | 414 | SQLAlchemy·ORM.</p> |
| Offset 477, 33 lines modified | Offset 477, 33 lines modified | ||
| 477 | <div·class="admonition·seealso"> | 477 | <div·class="admonition·seealso"> |
| 478 | <p·class="admonition-title">See·also</p> | 478 | <p·class="admonition-title">See·also</p> |
| 479 | <p><a·class="reference·internal"·href="../faq/performance.html#faq-how-to-profile"><span·class="std·std-ref">How·can·I·profile·a·SQLAlchemy·powered·application?</span></a></p> | 479 | <p><a·class="reference·internal"·href="../faq/performance.html#faq-how-to-profile"><span·class="std·std-ref">How·can·I·profile·a·SQLAlchemy·powered·application?</span></a></p> |
| 480 | </div> | 480 | </div> |
| 481 | <section·id="file-listing"> | 481 | <section·id="file-listing"> |
| 482 | <h4>File·Listing<a·class="headerlink"·href="#file-listing"·title="Link·to·this·heading">¶</a></h4> | 482 | <h4>File·Listing<a·class="headerlink"·href="#file-listing"·title="Link·to·this·heading">¶</a></h4> |
| 483 | <p>Listing·of·files:<ul·class="simple"> | 483 | <p>Listing·of·files:<ul·class="simple"> |
| 484 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/__main__.html">__main__.py</a>·-·Allows·the·examples/performance·package·to·be·run·as·a·script.</p> | ||
| 485 | </p></li> | ||
| 486 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/large_resultsets.html">large_resultsets.py</a>·-·In·this·series·of·tests,·we·are·looking·at·time·to·load·a·large·number | ||
| 487 | of·very·small·and·simple·rows.</p> | ||
| 488 | </p></li> | ||
| 484 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/single_inserts.html">single_inserts.py</a>·-·In·this·series·of·tests,·we’re·looking·at·a·method·that·inserts·a·row | 489 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/single_inserts.html">single_inserts.py</a>·-·In·this·series·of·tests,·we’re·looking·at·a·method·that·inserts·a·row |
| 485 | within·a·distinct·transaction,·and·afterwards·returns·to·essentially·a | 490 | within·a·distinct·transaction,·and·afterwards·returns·to·essentially·a |
| 486 | “closed”·state.···This·would·be·analogous·to·an·API·call·that·starts·up | 491 | “closed”·state.···This·would·be·analogous·to·an·API·call·that·starts·up |
| 487 | a·database·connection,·inserts·the·row,·commits·and·closes.</p> | 492 | a·database·connection,·inserts·the·row,·commits·and·closes.</p> |
| 488 | </p></li> | 493 | </p></li> |
| 489 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/short_selects.html">short_selects.py</a>·-·This·series·of·tests·illustrates·different·ways·to·SELECT·a·single | 494 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/short_selects.html">short_selects.py</a>·-·This·series·of·tests·illustrates·different·ways·to·SELECT·a·single |
| 490 | record·by·primary·key</p> | 495 | record·by·primary·key</p> |
| 491 | </p></li> | 496 | </p></li> |
| 492 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/bulk_inserts.html">bulk_inserts.py</a>·-·This·series·of·tests·illustrates·different·ways·to·INSERT·a·large·number | 497 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/bulk_inserts.html">bulk_inserts.py</a>·-·This·series·of·tests·illustrates·different·ways·to·INSERT·a·large·number |
| 493 | of·rows·in·bulk.</p> | 498 | of·rows·in·bulk.</p> |
| 494 | </p></li> | 499 | </p></li> |
| 495 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/bulk_updates.html">bulk_updates.py</a>·-·This·series·of·tests·will·illustrate·different·ways·to·UPDATE·a·large·number | 500 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/bulk_updates.html">bulk_updates.py</a>·-·This·series·of·tests·will·illustrate·different·ways·to·UPDATE·a·large·number |
| 496 | of·rows·in·bulk·(under·construction!·there’s·just·one·test·at·the·moment)</p> | 501 | of·rows·in·bulk·(under·construction!·there’s·just·one·test·at·the·moment)</p> |
| 497 | </p></li> | 502 | </p></li> |
| 498 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/__main__.html">__main__.py</a>·-·Allows·the·examples/performance·package·to·be·run·as·a·script.</p> | ||
| 499 | </p></li> | ||
| 500 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/large_resultsets.html">large_resultsets.py</a>·-·In·this·series·of·tests,·we·are·looking·at·time·to·load·a·large·number | ||
| 501 | of·very·small·and·simple·rows.</p> | ||
| 502 | </p></li> | ||
| 503 | </ul> | 503 | </ul> |
| 504 | </p> | 504 | </p> |
| 505 | </section> | 505 | </section> |
| 506 | <section·id="running-all-tests-with-time"> | 506 | <section·id="running-all-tests-with-time"> |
| 507 | <h4>Running·all·tests·with·time<a·class="headerlink"·href="#running-all-tests-with-time"·title="Link·to·this·heading">¶</a></h4> | 507 | <h4>Running·all·tests·with·time<a·class="headerlink"·href="#running-all-tests-with-time"·title="Link·to·this·heading">¶</a></h4> |
| 508 | <p>This·is·the·default·form·of·run:</p> | 508 | <p>This·is·the·default·form·of·run:</p> |
| 509 | <div·class="highlight-default·notranslate"><div·class="highlight"><pre><span></span><span·class="err">$</span>·<span·class="n">python</span>·<span·class="o">-</span><span·class="n">m</span>·<span·class="n">examples</span><span·class="o">.</span><span·class="n">performance</span>·<span·class="n">single_inserts</span> | 509 | <div·class="highlight-default·notranslate"><div·class="highlight"><pre><span></span><span·class="err">$</span>·<span·class="n">python</span>·<span·class="o">-</span><span·class="n">m</span>·<span·class="n">examples</span><span·class="o">.</span><span·class="n">performance</span>·<span·class="n">single_inserts</span> |
| Offset 756, 31 lines modified | Offset 756, 31 lines modified | ||
| 756 | <p>Several·examples·that·illustrate·the·technique·of·intercepting·changes | 756 | <p>Several·examples·that·illustrate·the·technique·of·intercepting·changes |
| 757 | that·would·be·first·interpreted·as·an·UPDATE·on·a·row,·and·instead·turning | 757 | that·would·be·first·interpreted·as·an·UPDATE·on·a·row,·and·instead·turning |
| 758 | it·into·an·INSERT·of·a·new·row,·leaving·the·previous·row·intact·as | 758 | it·into·an·INSERT·of·a·new·row,·leaving·the·previous·row·intact·as |
| 759 | a·historical·version.</p> | 759 | a·historical·version.</p> |
| 760 | <p>Compare·to·the·<a·class="reference·internal"·href="#examples-versioned-history"><span·class="std·std-ref">Versioning·with·a·History·Table</span></a>·example·which·writes·a | 760 | <p>Compare·to·the·<a·class="reference·internal"·href="#examples-versioned-history"><span·class="std·std-ref">Versioning·with·a·History·Table</span></a>·example·which·writes·a |
| 761 | history·row·to·a·separate·history·table.</p> | 761 | history·row·to·a·separate·history·table.</p> |
| 762 | <p>Listing·of·files:<ul·class="simple"> | 762 | <p>Listing·of·files:<ul·class="simple"> |
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| 109 | each·via·an·association·object·called·“OrderItem” | 109 | each·via·an·association·object·called·“OrderItem” |
| 110 | _\x8p_\x8r_\x8o_\x8x_\x8i_\x8e_\x8d_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·-·Same·example·as·basic_association,·adding·in·usage·of | 110 | _\x8p_\x8r_\x8o_\x8x_\x8i_\x8e_\x8d_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·-·Same·example·as·basic_association,·adding·in·usage·of |
| 111 | _\x8s_\x8q_\x8l_\x8a_\x8l_\x8c_\x8h_\x8e_\x8m_\x8y_\x8._\x8e_\x8x_\x8t_\x8._\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8p_\x8r_\x8o_\x8x_\x8y·to·make·explicit·references·to·OrderItem | 111 | _\x8s_\x8q_\x8l_\x8a_\x8l_\x8c_\x8h_\x8e_\x8m_\x8y_\x8._\x8e_\x8x_\x8t_\x8._\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8p_\x8r_\x8o_\x8x_\x8y·to·make·explicit·references·to·OrderItem |
| 112 | optional. | 112 | optional. |
| 113 | *\x8**\x8**\x8**\x8*·A\x8As\x8sy\x8yn\x8nc\x8ci\x8io\x8o·I\x8In\x8nt\x8te\x8eg\x8gr\x8ra\x8at\x8ti\x8io\x8on\x8n_\x8?\x8¶·*\x8**\x8**\x8**\x8* | 113 | *\x8**\x8**\x8**\x8*·A\x8As\x8sy\x8yn\x8nc\x8ci\x8io\x8o·I\x8In\x8nt\x8te\x8eg\x8gr\x8ra\x8at\x8ti\x8io\x8on\x8n_\x8?\x8¶·*\x8**\x8**\x8**\x8* |
| 114 | Examples·illustrating·the·asyncio·engine·feature·of·SQLAlchemy. | 114 | Examples·illustrating·the·asyncio·engine·feature·of·SQLAlchemy. |
| 115 | Listing·of·files: | 115 | Listing·of·files: |
| 116 | ····*·_\x8g_\x8r_\x8e_\x8e_\x8n_\x8l_\x8e_\x8t_\x8__\x8o_\x8r_\x8m_\x8._\x8p_\x8y·-·Illustrates·use·of·the | ||
| 117 | ······sqlalchemy.ext.asyncio.AsyncSession·object·for·asynchronous·ORM·use, | ||
| 118 | ······including·the·optional·run_sync()·method. | ||
| 116 | 119 | _\x8a_\x8s_\x8y_\x8n_\x8c_\x8__\x8o_\x8r_\x8m_\x8._\x8p_\x8y·-·Illustrates·use·of·the·sqlalchemy.ext.asyncio.AsyncSession | |
| 117 | 120 | object·for·asynchronous·ORM·use. | |
| 121 | _\x8b_\x8a_\x8s_\x8i_\x8c_\x8._\x8p_\x8y·-·Illustrates·the·asyncio·engine·/·connection·interface. | ||
| 118 | _\x8g_\x8r_\x8e_\x8e_\x8n_\x8l_\x8e_\x8t_\x8__\x8o_\x8r_\x8m_\x8._\x8p_\x8y·-·Illustrates·use·of·the·sqlalchemy.ext.asyncio.AsyncSession | ||
| 119 | object·for·asynchronous·ORM·use,·including·the·optional·run_sync()·method. | ||
| 120 | _\x8g_\x8a_\x8t_\x8h_\x8e_\x8r_\x8__\x8o_\x8r_\x8m_\x8__\x8s_\x8t_\x8a_\x8t_\x8e_\x8m_\x8e_\x8n_\x8t_\x8s_\x8._\x8p_\x8y·-·Illustrates·how·to·run·many·statements·concurrently | 122 | _\x8g_\x8a_\x8t_\x8h_\x8e_\x8r_\x8__\x8o_\x8r_\x8m_\x8__\x8s_\x8t_\x8a_\x8t_\x8e_\x8m_\x8e_\x8n_\x8t_\x8s_\x8._\x8p_\x8y·-·Illustrates·how·to·run·many·statements·concurrently |
| 121 | using·asyncio.gather()·along·many·asyncio·database·connections,·merging·ORM | 123 | using·asyncio.gather()·along·many·asyncio·database·connections,·merging·ORM |
| 122 | results·into·a·single·AsyncSession. | 124 | results·into·a·single·AsyncSession. |
| 123 | _\x8a_\x8s_\x8y_\x8n_\x8c_\x8__\x8o_\x8r_\x8m_\x8__\x8w_\x8r_\x8i_\x8t_\x8e_\x8o_\x8n_\x8l_\x8y_\x8._\x8p_\x8y·-·Illustrates·using·w\x8wr\x8ri\x8it\x8te\x8e·o\x8on\x8nl\x8ly\x8y·r\x8re\x8el\x8la\x8at\x8ti\x8io\x8on\x8ns\x8sh\x8hi\x8ip\x8ps\x8s·for·simpler | 125 | _\x8a_\x8s_\x8y_\x8n_\x8c_\x8__\x8o_\x8r_\x8m_\x8__\x8w_\x8r_\x8i_\x8t_\x8e_\x8o_\x8n_\x8l_\x8y_\x8._\x8p_\x8y·-·Illustrates·using·w\x8wr\x8ri\x8it\x8te\x8e·o\x8on\x8nl\x8ly\x8y·r\x8re\x8el\x8la\x8at\x8ti\x8io\x8on\x8ns\x8sh\x8hi\x8ip\x8ps\x8s·for·simpler |
| 124 | handling·of·ORM·collections·under·asyncio. | 126 | handling·of·ORM·collections·under·asyncio. |
| 125 | _\x8b_\x8a_\x8s_\x8i_\x8c_\x8._\x8p_\x8y·-·Illustrates·the·asyncio·engine·/·connection·interface. | ||
| 126 | *\x8**\x8**\x8**\x8*·D\x8Di\x8ir\x8re\x8ec\x8ct\x8te\x8ed\x8d·G\x8Gr\x8ra\x8ap\x8ph\x8hs\x8s_\x8?\x8¶·*\x8**\x8**\x8**\x8* | 127 | *\x8**\x8**\x8**\x8*·D\x8Di\x8ir\x8re\x8ec\x8ct\x8te\x8ed\x8d·G\x8Gr\x8ra\x8ap\x8ph\x8hs\x8s_\x8?\x8¶·*\x8**\x8**\x8**\x8* |
| 127 | An·example·of·persistence·for·a·directed·graph·structure.·The·graph·is·stored | 128 | An·example·of·persistence·for·a·directed·graph·structure.·The·graph·is·stored |
| 128 | as·a·collection·of·edges,·each·referencing·both·a·“lower”·and·an·“upper”·node | 129 | as·a·collection·of·edges,·each·referencing·both·a·“lower”·and·an·“upper”·node |
| 129 | in·a·table·of·nodes.·Basic·persistence·and·querying·for·lower-·and·upper- | 130 | in·a·table·of·nodes.·Basic·persistence·and·querying·for·lower-·and·upper- |
| 130 | neighbors·are·illustrated: | 131 | neighbors·are·illustrated: |
| 131 | n2·=·Node(2) | 132 | n2·=·Node(2) |
| 132 | n5·=·Node(5) | 133 | n5·=·Node(5) |
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| 148 | Supplier,·both·subclassing·the·HasAddresses·mixin,·which·ensures·that·the | 149 | Supplier,·both·subclassing·the·HasAddresses·mixin,·which·ensures·that·the |
| 149 | parent·class·is·provided·with·an·addresses·collection·which·contains·Address | 150 | parent·class·is·provided·with·an·addresses·collection·which·contains·Address |
| 150 | objects. | 151 | objects. |
| 151 | The·_\x8d_\x8i_\x8s_\x8c_\x8r_\x8i_\x8m_\x8i_\x8n_\x8a_\x8t_\x8o_\x8r_\x8__\x8o_\x8n_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·and·_\x8g_\x8e_\x8n_\x8e_\x8r_\x8i_\x8c_\x8__\x8f_\x8k_\x8._\x8p_\x8y·scripts·are·modernized | 152 | The·_\x8d_\x8i_\x8s_\x8c_\x8r_\x8i_\x8m_\x8i_\x8n_\x8a_\x8t_\x8o_\x8r_\x8__\x8o_\x8n_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·and·_\x8g_\x8e_\x8n_\x8e_\x8r_\x8i_\x8c_\x8__\x8f_\x8k_\x8._\x8p_\x8y·scripts·are·modernized |
| 152 | versions·of·recipes·presented·in·the·2007·blog·post·_\x8P_\x8o_\x8l_\x8y_\x8m_\x8o_\x8r_\x8p_\x8h_\x8i_\x8c_\x8·_\x8A_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8s | 153 | versions·of·recipes·presented·in·the·2007·blog·post·_\x8P_\x8o_\x8l_\x8y_\x8m_\x8o_\x8r_\x8p_\x8h_\x8i_\x8c_\x8·_\x8A_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8s |
| 153 | _\x8w_\x8i_\x8t_\x8h_\x8·_\x8S_\x8Q_\x8L_\x8A_\x8l_\x8c_\x8h_\x8e_\x8m_\x8y. | 154 | _\x8w_\x8i_\x8t_\x8h_\x8·_\x8S_\x8Q_\x8L_\x8A_\x8l_\x8c_\x8h_\x8e_\x8m_\x8y. |
| 154 | Listing·of·files: | 155 | Listing·of·files: |
| 156 | ····*·_\x8t_\x8a_\x8b_\x8l_\x8e_\x8__\x8p_\x8e_\x8r_\x8__\x8r_\x8e_\x8l_\x8a_\x8t_\x8e_\x8d_\x8._\x8p_\x8y·-·Illustrates·a·generic·association·which·persists | ||
| 157 | ······association·objects·within·individual·tables,·each·one·generated·to | ||
| 158 | ······persist·those·objects·on·behalf·of·a·particular·parent·class. | ||
| 155 | 159 | _.d_.i_.s_.c_.r_.i_.m_.i_.n_.a_.t_.o_.r_.__.o_.n_.__.a_.s_.s_.o_.c_.i_.a_.t_.i_.o_.n_.._.p_.y·-·Illustrates·a·mixin·which·provides·a·generic | |
| 156 | 160 | association·using·a·single·target·table·and·a·single·association·table, | |
| 157 | 161 | referred·to·by·all·parent·tables.·The·association·table·contains·a | |
| 158 | 162 | “discriminator”·column·which·determines·what·type·of·parent·object·associates | |
| 159 | 163 | to·each·particular·row·in·the·association·table. | |
| 164 | _\x8t_\x8a_\x8b_\x8l_\x8e_\x8__\x8p_\x8e_\x8r_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·-·Illustrates·a·mixin·which·provides·a·generic | ||
| 165 | association·via·a·individually·generated·association·tables·for·each·parent | ||
| 166 | class.·The·associated·objects·themselves·are·persisted·in·a·single·table·shared | ||
| 167 | among·all·parents. | ||
| 160 | _\x8g_\x8e_\x8n_\x8e_\x8r_\x8i_\x8c_\x8__\x8f_\x8k_\x8._\x8p_\x8y·-·Illustrates·a·so-called·“generic·foreign·key”,·in·a·similar | 168 | _\x8g_\x8e_\x8n_\x8e_\x8r_\x8i_\x8c_\x8__\x8f_\x8k_\x8._\x8p_\x8y·-·Illustrates·a·so-called·“generic·foreign·key”,·in·a·similar |
| 161 | fashion·to·that·of·popular·frameworks·such·as·Django,·ROR,·etc.·This·approach | 169 | fashion·to·that·of·popular·frameworks·such·as·Django,·ROR,·etc.·This·approach |
| 162 | bypasses·standard·referential·integrity·practices,·in·that·the·“foreign·key” | 170 | bypasses·standard·referential·integrity·practices,·in·that·the·“foreign·key” |
| 163 | column·is·not·actually·constrained·to·refer·to·any·particular·table;·instead, | 171 | column·is·not·actually·constrained·to·refer·to·any·particular·table;·instead, |
| 164 | in-application·logic·is·used·to·determine·which·table·is·referenced. | 172 | in-application·logic·is·used·to·determine·which·table·is·referenced. |
| 165 | _\x8t_\x8a_\x8b_\x8l_\x8e_\x8__\x8p_\x8e_\x8r_\x8__\x8r_\x8e_\x8l_\x8a_\x8t_\x8e_\x8d_\x8._\x8p_\x8y·-·Illustrates·a·generic·association·which·persists | ||
| 166 | association·objects·within·individual·tables,·each·one·generated·to·persist | ||
| 167 | those·objects·on·behalf·of·a·particular·parent·class. | ||
| 168 | _\x8t_\x8a_\x8b_\x8l_\x8e_\x8__\x8p_\x8e_\x8r_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·-·Illustrates·a·mixin·which·provides·a·generic | ||
| 169 | association·via·a·individually·generated·association·tables·for·each·parent | ||
| 170 | class.·The·associated·objects·themselves·are·persisted·in·a·single·table·shared | ||
| 171 | among·all·parents. | ||
| 172 | *\x8**\x8**\x8**\x8*·M\x8Ma\x8at\x8te\x8er\x8ri\x8ia\x8al\x8li\x8iz\x8ze\x8ed\x8d·P\x8Pa\x8at\x8th\x8hs\x8s_\x8?\x8¶·*\x8**\x8**\x8**\x8* | 173 | *\x8**\x8**\x8**\x8*·M\x8Ma\x8at\x8te\x8er\x8ri\x8ia\x8al\x8li\x8iz\x8ze\x8ed\x8d·P\x8Pa\x8at\x8th\x8hs\x8s_\x8?\x8¶·*\x8**\x8**\x8**\x8* |
| 173 | Illustrates·the·“materialized·paths”·pattern·for·hierarchical·data·using·the | 174 | Illustrates·the·“materialized·paths”·pattern·for·hierarchical·data·using·the |
| 174 | SQLAlchemy·ORM. | 175 | SQLAlchemy·ORM. |
| 175 | Listing·of·files: | 176 | Listing·of·files: |
| 176 | ····*·_\x8m_\x8a_\x8t_\x8e_\x8r_\x8i_\x8a_\x8l_\x8i_\x8z_\x8e_\x8d_\x8__\x8p_\x8a_\x8t_\x8h_\x8s_\x8._\x8p_\x8y·-·Illustrates·the·“materialized·paths”·pattern. | 177 | ····*·_\x8m_\x8a_\x8t_\x8e_\x8r_\x8i_\x8a_\x8l_\x8i_\x8z_\x8e_\x8d_\x8__\x8p_\x8a_\x8t_\x8h_\x8s_\x8._\x8p_\x8y·-·Illustrates·the·“materialized·paths”·pattern. |
| 177 | *\x8**\x8**\x8**\x8*·N\x8Ne\x8es\x8st\x8te\x8ed\x8d·S\x8Se\x8et\x8ts\x8s_\x8?\x8¶·*\x8**\x8**\x8**\x8* | 178 | *\x8**\x8**\x8**\x8*·N\x8Ne\x8es\x8st\x8te\x8ed\x8d·S\x8Se\x8et\x8ts\x8s_\x8?\x8¶·*\x8**\x8**\x8**\x8* |
| 178 | Illustrates·a·rudimentary·way·to·implement·the·“nested·sets”·pattern·for | 179 | Illustrates·a·rudimentary·way·to·implement·the·“nested·sets”·pattern·for |
| Offset 220, 29 lines modified | Offset 221, 29 lines modified | ||
| 220 | $·python·-m·examples.performance·bulk_inserts·\ | 221 | $·python·-m·examples.performance·bulk_inserts·\ |
| 221 | ····--dburl·mysql+mysqldb://scott:tiger@localhost/test·\ | 222 | ····--dburl·mysql+mysqldb://scott:tiger@localhost/test·\ |
| 222 | ····--profile·--num·1000 | 223 | ····--profile·--num·1000 |
| 223 | See·also | 224 | See·also |
| 224 | _\x8H_\x8o_\x8w_\x8·_\x8c_\x8a_\x8n_\x8·_\x8I_\x8·_\x8p_\x8r_\x8o_\x8f_\x8i_\x8l_\x8e_\x8·_\x8a_\x8·_\x8S_\x8Q_\x8L_\x8A_\x8l_\x8c_\x8h_\x8e_\x8m_\x8y_\x8·_\x8p_\x8o_\x8w_\x8e_\x8r_\x8e_\x8d_\x8·_\x8a_\x8p_\x8p_\x8l_\x8i_\x8c_\x8a_\x8t_\x8i_\x8o_\x8n_\x8? | 225 | _\x8H_\x8o_\x8w_\x8·_\x8c_\x8a_\x8n_\x8·_\x8I_\x8·_\x8p_\x8r_\x8o_\x8f_\x8i_\x8l_\x8e_\x8·_\x8a_\x8·_\x8S_\x8Q_\x8L_\x8A_\x8l_\x8c_\x8h_\x8e_\x8m_\x8y_\x8·_\x8p_\x8o_\x8w_\x8e_\x8r_\x8e_\x8d_\x8·_\x8a_\x8p_\x8p_\x8l_\x8i_\x8c_\x8a_\x8t_\x8i_\x8o_\x8n_\x8? |
| 225 | *\x8**\x8**\x8*·F\x8Fi\x8il\x8le\x8e·L\x8Li\x8is\x8st\x8ti\x8in\x8ng\x8g_\x8?\x8¶·*\x8**\x8**\x8* | 226 | *\x8**\x8**\x8*·F\x8Fi\x8il\x8le\x8e·L\x8Li\x8is\x8st\x8ti\x8in\x8ng\x8g_\x8?\x8¶·*\x8**\x8**\x8* |
| 226 | Listing·of·files: | 227 | Listing·of·files: |
| 228 | ····*·_\x8__\x8__\x8m_\x8a_\x8i_\x8n_\x8__\x8__\x8._\x8p_\x8y·-·Allows·the·examples/performance·package·to·be·run·as·a | ||
| 229 | ······script. | ||
| 230 | _\x8l_\x8a_\x8r_\x8g_\x8e_\x8__\x8r_\x8e_\x8s_\x8u_\x8l_\x8t_\x8s_\x8e_\x8t_\x8s_\x8._\x8p_\x8y·-·In·this·series·of·tests,·we·are·looking·at·time·to·load·a | ||
| 231 | large·number·of·very·small·and·simple·rows. | ||
| 227 | 232 | _.s_.i_.n_.g_.l_.e_.__.i_.n_.s_.e_.r_.t_.s_.._.p_.y·-·In·this·series·of·tests,·we’re·looking·at·a·method·that | |
| 228 | 233 | inserts·a·row·within·a·distinct·transaction,·and·afterwards·returns·to | |
| 229 | 234 | essentially·a·“closed”·state.·This·would·be·analogous·to·an·API·call·that | |
| 230 | 235 | starts·up·a·database·connection,·inserts·the·row,·commits·and·closes. | |
| 231 | ······closes. | ||
| 232 | _\x8s_\x8h_\x8o_\x8r_\x8t_\x8__\x8s_\x8e_\x8l_\x8e_\x8c_\x8t_\x8s_\x8._\x8p_\x8y·-·This·series·of·tests·illustrates·different·ways·to·SELECT·a | 236 | _\x8s_\x8h_\x8o_\x8r_\x8t_\x8__\x8s_\x8e_\x8l_\x8e_\x8c_\x8t_\x8s_\x8._\x8p_\x8y·-·This·series·of·tests·illustrates·different·ways·to·SELECT·a |
| 233 | single·record·by·primary·key | 237 | single·record·by·primary·key |
| 234 | _\x8b_\x8u_\x8l_\x8k_\x8__\x8i_\x8n_\x8s_\x8e_\x8r_\x8t_\x8s_\x8._\x8p_\x8y·-·This·series·of·tests·illustrates·different·ways·to·INSERT·a | 238 | _\x8b_\x8u_\x8l_\x8k_\x8__\x8i_\x8n_\x8s_\x8e_\x8r_\x8t_\x8s_\x8._\x8p_\x8y·-·This·series·of·tests·illustrates·different·ways·to·INSERT·a |
| 235 | large·number·of·rows·in·bulk. | 239 | large·number·of·rows·in·bulk. |
| 236 | _\x8b_\x8u_\x8l_\x8k_\x8__\x8u_\x8p_\x8d_\x8a_\x8t_\x8e_\x8s_\x8._\x8p_\x8y·-·This·series·of·tests·will·illustrate·different·ways·to·UPDATE | 240 | _\x8b_\x8u_\x8l_\x8k_\x8__\x8u_\x8p_\x8d_\x8a_\x8t_\x8e_\x8s_\x8._\x8p_\x8y·-·This·series·of·tests·will·illustrate·different·ways·to·UPDATE |
| 237 | a·large·number·of·rows·in·bulk·(under·construction!·there’s·just·one·test·at | 241 | a·large·number·of·rows·in·bulk·(under·construction!·there’s·just·one·test·at |
| 238 | the·moment) | 242 | the·moment) |
| 239 | _\x8__\x8__\x8m_\x8a_\x8i_\x8n_\x8__\x8__\x8._\x8p_\x8y·-·Allows·the·examples/performance·package·to·be·run·as·a·script. | ||
| 240 | _\x8l_\x8a_\x8r_\x8g_\x8e_\x8__\x8r_\x8e_\x8s_\x8u_\x8l_\x8t_\x8s_\x8e_\x8t_\x8s_\x8._\x8p_\x8y·-·In·this·series·of·tests,·we·are·looking·at·time·to·load·a | ||
| 241 | large·number·of·very·small·and·simple·rows. | ||
| 242 | *\x8**\x8**\x8*·R\x8Ru\x8un\x8nn\x8ni\x8in\x8ng\x8g·a\x8al\x8ll\x8l·t\x8te\x8es\x8st\x8ts\x8s·w\x8wi\x8it\x8th\x8h·t\x8ti\x8im\x8me\x8e_\x8?\x8¶·*\x8**\x8**\x8* | 243 | *\x8**\x8**\x8*·R\x8Ru\x8un\x8nn\x8ni\x8in\x8ng\x8g·a\x8al\x8ll\x8l·t\x8te\x8es\x8st\x8ts\x8s·w\x8wi\x8it\x8th\x8h·t\x8ti\x8im\x8me\x8e_\x8?\x8¶·*\x8**\x8**\x8* |
| 243 | This·is·the·default·form·of·run: | 244 | This·is·the·default·form·of·run: |
| 244 | $·python·-m·examples.performance·single_inserts | 245 | $·python·-m·examples.performance·single_inserts |
| 245 | Tests·to·run:·test_orm_commit,·test_bulk_save, | 246 | Tests·to·run:·test_orm_commit,·test_bulk_save, |
| 246 | ··············test_bulk_insert_dictionaries,·test_core, | 247 | ··············test_bulk_insert_dictionaries,·test_core, |
| 247 | ··············test_core_query_caching,·test_dbapi_raw_w_connect, | 248 | ··············test_core_query_caching,·test_dbapi_raw_w_connect, |
| 248 | ··············test_dbapi_raw_w_pool | 249 | ··············test_dbapi_raw_w_pool |
| Offset 473, 27 lines modified | Offset 474, 28 lines modified | ||
| 473 | Several·examples·that·illustrate·the·technique·of·intercepting·changes·that | 474 | Several·examples·that·illustrate·the·technique·of·intercepting·changes·that |
| 474 | would·be·first·interpreted·as·an·UPDATE·on·a·row,·and·instead·turning·it·into | 475 | would·be·first·interpreted·as·an·UPDATE·on·a·row,·and·instead·turning·it·into |
| 475 | an·INSERT·of·a·new·row,·leaving·the·previous·row·intact·as·a·historical | 476 | an·INSERT·of·a·new·row,·leaving·the·previous·row·intact·as·a·historical |
| 476 | version. | 477 | version. |
| 477 | Compare·to·the·_\x8V_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8i_\x8n_\x8g_\x8·_\x8w_\x8i_\x8t_\x8h_\x8·_\x8a_\x8·_\x8H_\x8i_\x8s_\x8t_\x8o_\x8r_\x8y_\x8·_\x8T_\x8a_\x8b_\x8l_\x8e·example·which·writes·a·history | 478 | Compare·to·the·_\x8V_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8i_\x8n_\x8g_\x8·_\x8w_\x8i_\x8t_\x8h_\x8·_\x8a_\x8·_\x8H_\x8i_\x8s_\x8t_\x8o_\x8r_\x8y_\x8·_\x8T_\x8a_\x8b_\x8l_\x8e·example·which·writes·a·history |
| 478 | row·to·a·separate·history·table. | 479 | row·to·a·separate·history·table. |
| 479 | Listing·of·files: | 480 | Listing·of·files: |
| 480 | ····*·_\x8v_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8e_\x8d_\x8__\x8r_\x8o_\x8w_\x8s_\x8._\x8p_\x8y·-·Illustrates·a·method·to·intercept·changes·on·objects, | ||
| 481 | ······turning·an·UPDATE·statement·on·a·single·row·into·an·INSERT·statement,·so | ||
| 482 | ······that·a·new·row·is·inserted·with·the·new·data,·keeping·the·old·row·intact. | ||
| 483 | _.v_.e_.r_.s_.i_.o_.n_.e_.d_.__.u_.p_.d_.a_.t_.e_.__.o_.l_.d_.__.r_.o_.w_.._.p_.y·-·Illustrates·the·same·UPDATE·into·INSERT | 481 | ····*·_.v_.e_.r_.s_.i_.o_.n_.e_.d_.__.u_.p_.d_.a_.t_.e_.__.o_.l_.d_.__.r_.o_.w_.._.p_.y·-·Illustrates·the·same·UPDATE·into·INSERT |
| 484 | of·versioned_rows.py,·but·also·emits·an·UPDATE·on·the·o.ol.ld.d·row | 482 | ······technique·of·versioned_rows.py,·but·also·emits·an·UPDATE·on·the·o.ol.ld.d·row |
| 483 | ······to·affect·a·change·in·timestamp.·Also·includes·a | ||
| 485 | 484 | ······_.S_.e_.s_.s_.i_.o_.n_.E_.v_.e_.n_.t_.s_.._.d_.o_.__.o_.r_.m_.__.e_.x_.e_.c_.u_.t_.e_.(_.)·hook·to·limit·queries·to·only·the·most | |
| 486 | 485 | ······recent·version. | |
| 487 | _\x8v_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8e_\x8d_\x8__\x8r_\x8o_\x8w_\x8s_\x8__\x8w_\x8__\x8v_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8i_\x8d_\x8._\x8p_\x8y·-·Illustrates·a·method·to·intercept·changes·on | 486 | _\x8v_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8e_\x8d_\x8__\x8r_\x8o_\x8w_\x8s_\x8__\x8w_\x8__\x8v_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8i_\x8d_\x8._\x8p_\x8y·-·Illustrates·a·method·to·intercept·changes·on |
| 488 | objects,·turning·an·UPDATE·statement·on·a·single·row·into·an·INSERT·statement, | 487 | objects,·turning·an·UPDATE·statement·on·a·single·row·into·an·INSERT·statement, |
| 489 | so·that·a·new·row·is·inserted·with·the·new·data,·keeping·the·old·row·intact. | 488 | so·that·a·new·row·is·inserted·with·the·new·data,·keeping·the·old·row·intact. |
| 490 | _\x8v_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8e_\x8d_\x8__\x8m_\x8a_\x8p_\x8._\x8p_\x8y·-·A·variant·of·the·versioned_rows·example·built·around·the | 489 | _\x8v_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8e_\x8d_\x8__\x8m_\x8a_\x8p_\x8._\x8p_\x8y·-·A·variant·of·the·versioned_rows·example·built·around·the |
| 491 | concept·of·a·“vertical·table”·structure,·like·those·illustrated·in·_\x8V_\x8e_\x8r_\x8t_\x8i_\x8c_\x8a_\x8l | 490 | concept·of·a·“vertical·table”·structure,·like·those·illustrated·in·_\x8V_\x8e_\x8r_\x8t_\x8i_\x8c_\x8a_\x8l |
| 492 | _\x8A_\x8t_\x8t_\x8r_\x8i_\x8b_\x8u_\x8t_\x8e_\x8·_\x8M_\x8a_\x8p_\x8p_\x8i_\x8n_\x8g·examples. | 491 | _\x8A_\x8t_\x8t_\x8r_\x8i_\x8b_\x8u_\x8t_\x8e_\x8·_\x8M_\x8a_\x8p_\x8p_\x8i_\x8n_\x8g·examples. |
| 492 | _\x8v_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8e_\x8d_\x8__\x8r_\x8o_\x8w_\x8s_\x8._\x8p_\x8y·-·Illustrates·a·method·to·intercept·changes·on·objects, | ||
| 493 | turning·an·UPDATE·statement·on·a·single·row·into·an·INSERT·statement,·so·that·a | ||
| 494 | new·row·is·inserted·with·the·new·data,·keeping·the·old·row·intact. | ||
| 493 | *\x8**\x8**\x8**\x8*·V\x8Ve\x8er\x8rt\x8ti\x8ic\x8ca\x8al\x8l·A\x8At\x8tt\x8tr\x8ri\x8ib\x8bu\x8ut\x8te\x8e·M\x8Ma\x8ap\x8pp\x8pi\x8in\x8ng\x8g_\x8?\x8¶·*\x8**\x8**\x8**\x8* | 495 | *\x8**\x8**\x8**\x8*·V\x8Ve\x8er\x8rt\x8ti\x8ic\x8ca\x8al\x8l·A\x8At\x8tt\x8tr\x8ri\x8ib\x8bu\x8ut\x8te\x8e·M\x8Ma\x8ap\x8pp\x8pi\x8in\x8ng\x8g_\x8?\x8¶·*\x8**\x8**\x8**\x8* |
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