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| 9239 | <div·class="admonition·seealso"> | 9239 | <div·class="admonition·seealso"> |
| 9240 | <p·class="admonition-title">See·also</p> | 9240 | <p·class="admonition-title">See·also</p> |
| 9241 | <p><a·class="reference·internal"·href="migration_14.html#change-4710-core"><span·class="std·std-ref">RowProxy·is·no·longer·a·“proxy”;·is·now·called·Row·and·behaves·like·an·enhanced·named·tuple</span></a></p> | 9241 | <p><a·class="reference·internal"·href="migration_14.html#change-4710-core"><span·class="std·std-ref">RowProxy·is·no·longer·a·“proxy”;·is·now·called·Row·and·behaves·like·an·enhanced·named·tuple</span></a></p> |
| 9242 | </div> | 9242 | </div> |
| 9243 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/4710">#4710</a></p> | 9243 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/4710">#4710</a></p> |
| 9244 | </p> | 9244 | </p> |
| 9245 | </li> | 9245 | </li> |
| 9246 | <li><p·class="caption"·id="change-1.4.0b1-54"><span·class="target"·id="change-6bc91a2bef8d8afd244e6dbd38439c4d"><strong>[engine]·[performance]</strong>·<a·class="changelog-reference·headerlink·reference·internal"·href="#change-6bc91a2bef8d8afd244e6dbd38439c4d">¶</a></span><p>The·pool·“pre-ping”·feature·has·been·refined·to·not·invoke·for·a·DBAPI | ||
| 9247 | connection·that·was·just·opened·in·the·same·checkout·operation.··pre·ping | ||
| 9248 | only·applies·to·a·DBAPI·connection·that’s·been·checked·into·the·pool | ||
| 9249 | and·is·being·checked·out·again.</p> | ||
| 9250 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/4524">#4524</a></p> | ||
| 9251 | </p> | ||
| 9252 | </li> | ||
| 9253 | <li><p·class="caption"·id="change-1.4.0b1-5 | 9246 | <li><p·class="caption"·id="change-1.4.0b1-54"><span·class="target"·id="change-d3650b27f4c852ac687ea55326051ed0"><strong>[engine]·[change]·[performance]·[py3k]</strong>·<a·class="changelog-reference·headerlink·reference·internal"·href="#change-d3650b27f4c852ac687ea55326051ed0">¶</a></span><p>Disabled·the·“unicode·returns”·check·that·runs·on·dialect·startup·when |
| 9254 | running·under·Python·3,·which·for·many·years·has·occurred·in·order·to·test | 9247 | running·under·Python·3,·which·for·many·years·has·occurred·in·order·to·test |
| 9255 | the·current·DBAPI’s·behavior·for·whether·or·not·it·returns·Python·Unicode | 9248 | the·current·DBAPI’s·behavior·for·whether·or·not·it·returns·Python·Unicode |
| 9256 | or·Py2K·strings·for·the·VARCHAR·and·NVARCHAR·datatypes.··The·check·still | 9249 | or·Py2K·strings·for·the·VARCHAR·and·NVARCHAR·datatypes.··The·check·still |
| 9257 | occurs·by·default·under·Python·2,·however·the·mechanism·to·test·the | 9250 | occurs·by·default·under·Python·2,·however·the·mechanism·to·test·the |
| 9258 | behavior·will·be·removed·in·SQLAlchemy·2.0·when·Python·2·support·is·also | 9251 | behavior·will·be·removed·in·SQLAlchemy·2.0·when·Python·2·support·is·also |
| 9259 | removed.</p> | 9252 | removed.</p> |
| 9260 | <p>This·logic·was·very·effective·when·it·was·needed,·however·now·that·Python·3 | 9253 | <p>This·logic·was·very·effective·when·it·was·needed,·however·now·that·Python·3 |
| Offset 9265, 14 lines modified | Offset 9258, 21 lines modified | ||
| 9265 | dialect·flags·by·setting·the·dialect·level·flag·<code·class="docutils·literal·notranslate"><span·class="pre">returns_unicode_strings</span></code> | 9258 | dialect·flags·by·setting·the·dialect·level·flag·<code·class="docutils·literal·notranslate"><span·class="pre">returns_unicode_strings</span></code> |
| 9266 | to·one·of·<code·class="xref·py·py-attr·docutils·literal·notranslate"><span·class="pre">String.RETURNS_CONDITIONAL</span></code>·or | 9259 | to·one·of·<code·class="xref·py·py-attr·docutils·literal·notranslate"><span·class="pre">String.RETURNS_CONDITIONAL</span></code>·or |
| 9267 | <code·class="xref·py·py-attr·docutils·literal·notranslate"><span·class="pre">String.RETURNS_BYTES</span></code>,·both·of·which·will·enable·Unicode·conversion | 9260 | <code·class="xref·py·py-attr·docutils·literal·notranslate"><span·class="pre">String.RETURNS_BYTES</span></code>,·both·of·which·will·enable·Unicode·conversion |
| 9268 | even·under·Python·3.</p> | 9261 | even·under·Python·3.</p> |
| 9269 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/5315">#5315</a></p> | 9262 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/5315">#5315</a></p> |
| 9270 | </p> | 9263 | </p> |
| 9271 | </li> | 9264 | </li> |
| 9265 | <li><p·class="caption"·id="change-1.4.0b1-55"><span·class="target"·id="change-6bc91a2bef8d8afd244e6dbd38439c4d"><strong>[engine]·[performance]</strong>·<a·class="changelog-reference·headerlink·reference·internal"·href="#change-6bc91a2bef8d8afd244e6dbd38439c4d">¶</a></span><p>The·pool·“pre-ping”·feature·has·been·refined·to·not·invoke·for·a·DBAPI | ||
| 9266 | connection·that·was·just·opened·in·the·same·checkout·operation.··pre·ping | ||
| 9267 | only·applies·to·a·DBAPI·connection·that’s·been·checked·into·the·pool | ||
| 9268 | and·is·being·checked·out·again.</p> | ||
| 9269 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/4524">#4524</a></p> | ||
| 9270 | </p> | ||
| 9271 | </li> | ||
| 9272 | <li><p·class="caption"·id="change-1.4.0b1-56"><span·class="target"·id="change-f8a130923cff752e26f7be9cf1ea18eb"><strong>[engine]·[bug]</strong>·<a·class="changelog-reference·headerlink·reference·internal"·href="#change-f8a130923cff752e26f7be9cf1ea18eb">¶</a></span><p>Revised·the·<a·class="reference·internal"·href="../core/connections.html#sqlalchemy.engine.Connection.execution_options.params.schema_translate_map"·title="sqlalchemy.engine.Connection.execution_options"><code·class="xref·py·py-paramref·docutils·literal·notranslate"><span·class="pre">Connection.execution_options.schema_translate_map</span></code></a> | 9272 | <li><p·class="caption"·id="change-1.4.0b1-56"><span·class="target"·id="change-f8a130923cff752e26f7be9cf1ea18eb"><strong>[engine]·[bug]</strong>·<a·class="changelog-reference·headerlink·reference·internal"·href="#change-f8a130923cff752e26f7be9cf1ea18eb">¶</a></span><p>Revised·the·<a·class="reference·internal"·href="../core/connections.html#sqlalchemy.engine.Connection.execution_options.params.schema_translate_map"·title="sqlalchemy.engine.Connection.execution_options"><code·class="xref·py·py-paramref·docutils·literal·notranslate"><span·class="pre">Connection.execution_options.schema_translate_map</span></code></a> |
| 9273 | feature·such·that·the·processing·of·the·SQL·statement·to·receive·a·specific | 9273 | feature·such·that·the·processing·of·the·SQL·statement·to·receive·a·specific |
| 9274 | schema·name·occurs·within·the·execution·phase·of·the·statement,·rather·than | 9274 | schema·name·occurs·within·the·execution·phase·of·the·statement,·rather·than |
| 9275 | at·the·compile·phase.···This·is·to·support·the·statement·being·efficiently | 9275 | at·the·compile·phase.···This·is·to·support·the·statement·being·efficiently |
| 9276 | cached.···Previously,·the·current·schema·being·rendered·into·the·statement | 9276 | cached.···Previously,·the·current·schema·being·rendered·into·the·statement |
| 9277 | for·a·particular·run·would·be·considered·as·part·of·the·cache·key·itself, | 9277 | for·a·particular·run·would·be·considered·as·part·of·the·cache·key·itself, |
| 9278 | meaning·that·for·a·run·against·hundreds·of·schemas,·there·would·be·hundreds | 9278 | meaning·that·for·a·run·against·hundreds·of·schemas,·there·would·be·hundreds |
| Offset 6354, 21 lines modified | Offset 6354, 15 lines modified | ||
| 6354 | returned·by·the·ResultProxy·is·now·the·LegacyRow·subclass,·which·maintains | 6354 | returned·by·the·ResultProxy·is·now·the·LegacyRow·subclass,·which·maintains |
| 6355 | mapping/tuple·hybrid·behavior,·however·the·base·_\x8R_\x8o_\x8w·class·now·behaves·more | 6355 | mapping/tuple·hybrid·behavior,·however·the·base·_\x8R_\x8o_\x8w·class·now·behaves·more |
| 6356 | fully·like·a·named·tuple. | 6356 | fully·like·a·named·tuple. |
| 6357 | See·also | 6357 | See·also |
| 6358 | _\x8R_\x8o_\x8w_\x8P_\x8r_\x8o_\x8x_\x8y_\x8·_\x8i_\x8s_\x8·_\x8n_\x8o_\x8·_\x8l_\x8o_\x8n_\x8g_\x8e_\x8r_\x8·_\x8a_\x8·_\x8“_\x8p_\x8r_\x8o_\x8x_\x8y_\x8”_\x8;_\x8·_\x8i_\x8s_\x8·_\x8n_\x8o_\x8w_\x8·_\x8c_\x8a_\x8l_\x8l_\x8e_\x8d_\x8·_\x8R_\x8o_\x8w_\x8·_\x8a_\x8n_\x8d_\x8·_\x8b_\x8e_\x8h_\x8a_\x8v_\x8e_\x8s_\x8·_\x8l_\x8i_\x8k_\x8e_\x8·_\x8a_\x8n_\x8·_\x8e_\x8n_\x8h_\x8a_\x8n_\x8c_\x8e_\x8d | 6358 | _\x8R_\x8o_\x8w_\x8P_\x8r_\x8o_\x8x_\x8y_\x8·_\x8i_\x8s_\x8·_\x8n_\x8o_\x8·_\x8l_\x8o_\x8n_\x8g_\x8e_\x8r_\x8·_\x8a_\x8·_\x8“_\x8p_\x8r_\x8o_\x8x_\x8y_\x8”_\x8;_\x8·_\x8i_\x8s_\x8·_\x8n_\x8o_\x8w_\x8·_\x8c_\x8a_\x8l_\x8l_\x8e_\x8d_\x8·_\x8R_\x8o_\x8w_\x8·_\x8a_\x8n_\x8d_\x8·_\x8b_\x8e_\x8h_\x8a_\x8v_\x8e_\x8s_\x8·_\x8l_\x8i_\x8k_\x8e_\x8·_\x8a_\x8n_\x8·_\x8e_\x8n_\x8h_\x8a_\x8n_\x8c_\x8e_\x8d |
| 6359 | _\x8n_\x8a_\x8m_\x8e_\x8d_\x8·_\x8t_\x8u_\x8p_\x8l_\x8e | 6359 | _\x8n_\x8a_\x8m_\x8e_\x8d_\x8·_\x8t_\x8u_\x8p_\x8l_\x8e |
| 6360 | References:·_\x8#_\x84_\x87_\x81_\x80 | 6360 | References:·_\x8#_\x84_\x87_\x81_\x80 |
| 6361 | [\x8[e\x8en\x8ng\x8gi\x8in\x8ne\x8e]\x8]·[\x8[p\x8pe\x8er\x8rf\x8fo\x8or\x8rm\x8ma\x8an\x8nc\x8ce\x8e]\x8]·_\x8¶ | ||
| 6362 | The·pool·“pre-ping”·feature·has·been·refined·to·not·invoke·for·a·DBAPI | ||
| 6363 | connection·that·was·just·opened·in·the·same·checkout·operation.·pre·ping·only | ||
| 6364 | applies·to·a·DBAPI·connection·that’s·been·checked·into·the·pool·and·is·being | ||
| 6365 | checked·out·again. | ||
| 6366 | References:·_\x8#_\x84_\x85_\x82_\x84 | ||
| 6367 | [\x8[e\x8en\x8ng\x8gi\x8in\x8ne\x8e]\x8]·[\x8[ | 6361 | [\x8[e\x8en\x8ng\x8gi\x8in\x8ne\x8e]\x8]·[\x8[c.ch.ha.an.ng.ge.e].]·[.[p.pe.er.rf.fo.or.rm.ma.an.nc.ce\x8e]\x8]·[\x8[p\x8py\x8y3\x83k\x8k]\x8]·_\x8¶ |
| 6368 | Disabled·the·“unicode·returns”·check·that·runs·on·dialect·startup·when·running | 6362 | Disabled·the·“unicode·returns”·check·that·runs·on·dialect·startup·when·running |
| 6369 | under·Python·3,·which·for·many·years·has·occurred·in·order·to·test·the·current | 6363 | under·Python·3,·which·for·many·years·has·occurred·in·order·to·test·the·current |
| 6370 | DBAPI’s·behavior·for·whether·or·not·it·returns·Python·Unicode·or·Py2K·strings | 6364 | DBAPI’s·behavior·for·whether·or·not·it·returns·Python·Unicode·or·Py2K·strings |
| 6371 | for·the·VARCHAR·and·NVARCHAR·datatypes.·The·check·still·occurs·by·default·under | 6365 | for·the·VARCHAR·and·NVARCHAR·datatypes.·The·check·still·occurs·by·default·under |
| 6372 | Python·2,·however·the·mechanism·to·test·the·behavior·will·be·removed·in | 6366 | Python·2,·however·the·mechanism·to·test·the·behavior·will·be·removed·in |
| 6373 | SQLAlchemy·2.0·when·Python·2·support·is·also·removed. | 6367 | SQLAlchemy·2.0·when·Python·2·support·is·also·removed. |
| 6374 | This·logic·was·very·effective·when·it·was·needed,·however·now·that·Python·3·is | 6368 | This·logic·was·very·effective·when·it·was·needed,·however·now·that·Python·3·is |
| Offset 6376, 14 lines modified | Offset 6370, 20 lines modified | ||
| 6376 | datatypes.·In·the·unlikely·case·that·a·third·party·DBAPI·does·not·support·this, | 6370 | datatypes.·In·the·unlikely·case·that·a·third·party·DBAPI·does·not·support·this, |
| 6377 | the·conversion·logic·within·_\x8S_\x8t_\x8r_\x8i_\x8n_\x8g·is·still·available·and·the·third·party | 6371 | the·conversion·logic·within·_\x8S_\x8t_\x8r_\x8i_\x8n_\x8g·is·still·available·and·the·third·party |
| 6378 | dialect·may·specify·this·in·its·upfront·dialect·flags·by·setting·the·dialect | 6372 | dialect·may·specify·this·in·its·upfront·dialect·flags·by·setting·the·dialect |
| 6379 | level·flag·returns_unicode_strings·to·one·of·String.RETURNS_CONDITIONAL·or | 6373 | level·flag·returns_unicode_strings·to·one·of·String.RETURNS_CONDITIONAL·or |
| 6380 | String.RETURNS_BYTES,·both·of·which·will·enable·Unicode·conversion·even·under | 6374 | String.RETURNS_BYTES,·both·of·which·will·enable·Unicode·conversion·even·under |
| 6381 | Python·3. | 6375 | Python·3. |
| 6382 | References:·_\x8#_\x85_\x83_\x81_\x85 | 6376 | References:·_\x8#_\x85_\x83_\x81_\x85 |
| 6377 | [\x8[e\x8en\x8ng\x8gi\x8in\x8ne\x8e]\x8]·[\x8[p\x8pe\x8er\x8rf\x8fo\x8or\x8rm\x8ma\x8an\x8nc\x8ce\x8e]\x8]·_\x8¶ | ||
| 6378 | The·pool·“pre-ping”·feature·has·been·refined·to·not·invoke·for·a·DBAPI | ||
| 6379 | connection·that·was·just·opened·in·the·same·checkout·operation.·pre·ping·only | ||
| 6380 | applies·to·a·DBAPI·connection·that’s·been·checked·into·the·pool·and·is·being | ||
| 6381 | checked·out·again. | ||
| 6382 | References:·_\x8#_\x84_\x85_\x82_\x84 | ||
| 6383 | [\x8[e\x8en\x8ng\x8gi\x8in\x8ne\x8e]\x8]·[\x8[b\x8bu\x8ug\x8g]\x8]·_\x8¶ | 6383 | [\x8[e\x8en\x8ng\x8gi\x8in\x8ne\x8e]\x8]·[\x8[b\x8bu\x8ug\x8g]\x8]·_\x8¶ |
| 6384 | Revised·the·_\x8C_\x8o_\x8n_\x8n_\x8e_\x8c_\x8t_\x8i_\x8o_\x8n_\x8._\x8e_\x8x_\x8e_\x8c_\x8u_\x8t_\x8i_\x8o_\x8n_\x8__\x8o_\x8p_\x8t_\x8i_\x8o_\x8n_\x8s_\x8._\x8s_\x8c_\x8h_\x8e_\x8m_\x8a_\x8__\x8t_\x8r_\x8a_\x8n_\x8s_\x8l_\x8a_\x8t_\x8e_\x8__\x8m_\x8a_\x8p·feature·such·that | 6384 | Revised·the·_\x8C_\x8o_\x8n_\x8n_\x8e_\x8c_\x8t_\x8i_\x8o_\x8n_\x8._\x8e_\x8x_\x8e_\x8c_\x8u_\x8t_\x8i_\x8o_\x8n_\x8__\x8o_\x8p_\x8t_\x8i_\x8o_\x8n_\x8s_\x8._\x8s_\x8c_\x8h_\x8e_\x8m_\x8a_\x8__\x8t_\x8r_\x8a_\x8n_\x8s_\x8l_\x8a_\x8t_\x8e_\x8__\x8m_\x8a_\x8p·feature·such·that |
| 6385 | the·processing·of·the·SQL·statement·to·receive·a·specific·schema·name·occurs | 6385 | the·processing·of·the·SQL·statement·to·receive·a·specific·schema·name·occurs |
| 6386 | within·the·execution·phase·of·the·statement,·rather·than·at·the·compile·phase. | 6386 | within·the·execution·phase·of·the·statement,·rather·than·at·the·compile·phase. |
| 6387 | This·is·to·support·the·statement·being·efficiently·cached.·Previously,·the | 6387 | This·is·to·support·the·statement·being·efficiently·cached.·Previously,·the |
| 6388 | current·schema·being·rendered·into·the·statement·for·a·particular·run·would·be | 6388 | current·schema·being·rendered·into·the·statement·for·a·particular·run·would·be |
| 6389 | considered·as·part·of·the·cache·key·itself,·meaning·that·for·a·run·against | 6389 | considered·as·part·of·the·cache·key·itself,·meaning·that·for·a·run·against |
| Offset 7935, 45 lines modified | Offset 7935, 45 lines modified | ||
| 7935 | </p> | 7935 | </p> |
| 7936 | </li> | 7936 | </li> |
| 7937 | <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 | 7937 | <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 |
| 7938 | since·version·3.35.</p> | 7938 | since·version·3.35.</p> |
| 7939 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/6195">#6195</a></p> | 7939 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/6195">#6195</a></p> |
| 7940 | </p> | 7940 | </p> |
| 7941 | </li> | 7941 | </li> |
| 7942 | <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 | ||
| 7943 | <code·class="docutils·literal·notranslate"><span·class="pre">fromisoformat()</span></code>·methods·in·order·to·parse·incoming·datetime,·date,·and | ||
| 7944 | time·string·values.·This·improves·performance·vs.·the·previous·regular | ||
| 7945 | expression-based·approach,·and·also·automatically·accommodates·for·datetime | ||
| 7946 | and·time·formats·that·contain·either·a·six-digit·“microseconds”·format·or·a | ||
| 7947 | three-digit·“milliseconds”·format.</p> | ||
| 7948 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/7029">#7029</a></p> | ||
| 7949 | </p> | ||
| 7950 | </li> | ||
| 7942 | <li><p·class="caption"·id="change-2.0.0b1-8 | 7951 | <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 |
| 7943 | that·may·refer·to·additional·tables·within·the·WHERE·criteria·of·the | 7952 | that·may·refer·to·additional·tables·within·the·WHERE·criteria·of·the |
| 7944 | statement·without·the·need·to·use·subqueries.·This·syntax·is·invoked | 7953 | statement·without·the·need·to·use·subqueries.·This·syntax·is·invoked |
| 7945 | 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 | 7954 | 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 |
| 7946 | one·table·or·other·entity·or·selectable·is·used.</p> | 7955 | one·table·or·other·entity·or·selectable·is·used.</p> |
| 7947 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/7185">#7185</a></p> | 7956 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/7185">#7185</a></p> |
| 7948 | </p> | 7957 | </p> |
| 7949 | </li> | 7958 | </li> |
| 7950 | <li><p·class="caption"·id="change-2.0.0b1-8 | 7959 | <li><p·class="caption"·id="change-2.0.0b1-88"><span·class="target"·id="change-aba109875059299e0eb82359b5825416"><strong>[sqlite]·[performance]·[bug]</strong>·<a·class="changelog-reference·headerlink·reference·internal"·href="#change-aba109875059299e0eb82359b5825416">¶</a></span><p>The·SQLite·dialect·now·defaults·to·<a·class="reference·internal"·href="../core/pooling.html#sqlalchemy.pool.QueuePool"·title="sqlalchemy.pool.QueuePool"><code·class="xref·py·py-class·docutils·literal·notranslate"><span·class="pre">QueuePool</span></code></a>·when·a·file |
| 7951 | based·database·is·used.·This·is·set·along·with·setting·the | 7960 | based·database·is·used.·This·is·set·along·with·setting·the |
| 7952 | <code·class="docutils·literal·notranslate"><span·class="pre">check_same_thread</span></code>·parameter·to·<code·class="docutils·literal·notranslate"><span·class="pre">False</span></code>.·It·has·been·observed·that·the | 7961 | <code·class="docutils·literal·notranslate"><span·class="pre">check_same_thread</span></code>·parameter·to·<code·class="docutils·literal·notranslate"><span·class="pre">False</span></code>.·It·has·been·observed·that·the |
| 7953 | previous·approach·of·defaulting·to·<a·class="reference·internal"·href="../core/pooling.html#sqlalchemy.pool.NullPool"·title="sqlalchemy.pool.NullPool"><code·class="xref·py·py-class·docutils·literal·notranslate"><span·class="pre">NullPool</span></code></a>,·which·does·not | 7962 | previous·approach·of·defaulting·to·<a·class="reference·internal"·href="../core/pooling.html#sqlalchemy.pool.NullPool"·title="sqlalchemy.pool.NullPool"><code·class="xref·py·py-class·docutils·literal·notranslate"><span·class="pre">NullPool</span></code></a>,·which·does·not |
| 7954 | hold·onto·database·connections·after·they·are·released,·did·in·fact·have·a | 7963 | hold·onto·database·connections·after·they·are·released,·did·in·fact·have·a |
| 7955 | measurable·negative·performance·impact.·As·always,·the·pool·class·is | 7964 | measurable·negative·performance·impact.·As·always,·the·pool·class·is |
| 7956 | customizable·via·the·<a·class="reference·internal"·href="../core/engines.html#sqlalchemy.create_engine.params.poolclass"·title="sqlalchemy.create_engine"><code·class="xref·py·py-paramref·docutils·literal·notranslate"><span·class="pre">create_engine.poolclass</span></code></a>·parameter.</p> | 7965 | customizable·via·the·<a·class="reference·internal"·href="../core/engines.html#sqlalchemy.create_engine.params.poolclass"·title="sqlalchemy.create_engine"><code·class="xref·py·py-paramref·docutils·literal·notranslate"><span·class="pre">create_engine.poolclass</span></code></a>·parameter.</p> |
| 7957 | <div·class="admonition·seealso"> | 7966 | <div·class="admonition·seealso"> |
| 7958 | <p·class="admonition-title">See·also</p> | 7967 | <p·class="admonition-title">See·also</p> |
| 7959 | <p><a·class="reference·internal"·href="whatsnew_20.html#change-7490"><span·class="std·std-ref">The·SQLite·dialect·uses·QueuePool·for·file-based·databases</span></a></p> | 7968 | <p><a·class="reference·internal"·href="whatsnew_20.html#change-7490"><span·class="std·std-ref">The·SQLite·dialect·uses·QueuePool·for·file-based·databases</span></a></p> |
| 7960 | </div> | 7969 | </div> |
| 7961 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/7490">#7490</a></p> | 7970 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/7490">#7490</a></p> |
| 7962 | </p> | 7971 | </p> |
| 7963 | </li> | 7972 | </li> |
| 7964 | <li><p·class="caption"·id="change-2.0.0b1-88"><span·class="target"·id="change-74fee584f531c832d0d97ea94be754b8"><strong>[sqlite]·[performance]·[usecase]</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 | ||
| 7965 | <code·class="docutils·literal·notranslate"><span·class="pre">fromisoformat()</span></code>·methods·in·order·to·parse·incoming·datetime,·date,·and | ||
| 7966 | time·string·values.·This·improves·performance·vs.·the·previous·regular | ||
| 7967 | expression-based·approach,·and·also·automatically·accommodates·for·datetime | ||
| 7968 | and·time·formats·that·contain·either·a·six-digit·“microseconds”·format·or·a | ||
| 7969 | three-digit·“milliseconds”·format.</p> | ||
| 7970 | <p>References:·<a·class="reference·external"·href="https://www.sqlalchemy.org/trac/ticket/7029">#7029</a></p> | ||
| 7971 | </p> | ||
| 7972 | </li> | ||
| 7973 | <li><p·class="caption"·id="change-2.0.0b1-89"><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 | 7973 | <li><p·class="caption"·id="change-2.0.0b1-89"><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 |
| 7974 | DBAPIs·not·supporting·Decimal·values·natively.·This·warning·was·oriented | 7974 | DBAPIs·not·supporting·Decimal·values·natively.·This·warning·was·oriented |
| 7975 | towards·SQLite,·which·does·not·have·any·real·way·without·additional | 7975 | towards·SQLite,·which·does·not·have·any·real·way·without·additional |
| 7976 | extensions·or·workarounds·of·handling·precision·numeric·values·more·than·15 | 7976 | extensions·or·workarounds·of·handling·precision·numeric·values·more·than·15 |
| 7977 | significant·digits·as·it·only·uses·floating·point·math·to·represent | 7977 | significant·digits·as·it·only·uses·floating·point·math·to·represent |
| 7978 | numbers.·As·this·is·a·known·and·documented·limitation·in·SQLite·itself,·and | 7978 | numbers.·As·this·is·a·known·and·documented·limitation·in·SQLite·itself,·and |
| 7979 | not·a·quirk·of·the·pysqlite·driver,·there’s·no·need·for·SQLAlchemy·to·warn | 7979 | not·a·quirk·of·the·pysqlite·driver,·there’s·no·need·for·SQLAlchemy·to·warn |
| Offset 5472, 14 lines modified | Offset 5472, 22 lines modified | ||
| 5472 | ······See·also | 5472 | ······See·also |
| 5473 | ······_\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 | 5473 | ······_\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 |
| 5474 | ······References:·_\x8#_\x88_\x82_\x83_\x84 | 5474 | ······References:·_\x8#_\x88_\x82_\x83_\x84 |
| 5475 | [\x8[s\x8sq\x8ql\x8li\x8it\x8te\x8e]\x8]·[\x8[u\x8us\x8se\x8ec\x8ca\x8as\x8se\x8e]\x8]·_\x8¶ | 5475 | [\x8[s\x8sq\x8ql\x8li\x8it\x8te\x8e]\x8]·[\x8[u\x8us\x8se\x8ec\x8ca\x8as\x8se\x8e]\x8]·_\x8¶ |
| 5476 | Added·RETURNING·support·for·the·SQLite·dialect.·SQLite·supports·RETURNING·since | 5476 | Added·RETURNING·support·for·the·SQLite·dialect.·SQLite·supports·RETURNING·since |
| 5477 | version·3.35. | 5477 | version·3.35. |
| 5478 | References:·_\x8#_\x86_\x81_\x89_\x85 | 5478 | References:·_\x8#_\x86_\x81_\x89_\x85 |
| 5479 | [\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¶ | ||
| 5480 | SQLite·datetime,·date,·and·time·datatypes·now·use·Python·standard·lib | ||
| 5481 | fromisoformat()·methods·in·order·to·parse·incoming·datetime,·date,·and·time | ||
| 5482 | string·values.·This·improves·performance·vs.·the·previous·regular·expression- | ||
| 5483 | based·approach,·and·also·automatically·accommodates·for·datetime·and·time | ||
| 5484 | formats·that·contain·either·a·six-digit·“microseconds”·format·or·a·three-digit | ||
| 5485 | “milliseconds”·format. | ||
| 5486 | References:·_\x8#_\x87_\x80_\x82_\x89 | ||
| 5479 | [\x8[s\x8sq\x8ql\x8li\x8it\x8te\x8e]\x8]·[\x8[u\x8us\x8se\x8ec\x8ca\x8as\x8se\x8e]\x8]·_\x8¶ | 5487 | [\x8[s\x8sq\x8ql\x8li\x8it\x8te\x8e]\x8]·[\x8[u\x8us\x8se\x8ec\x8ca\x8as\x8se\x8e]\x8]·_\x8¶ |
| 5480 | The·SQLite·dialect·now·supports·UPDATE..FROM·syntax,·for·UPDATE·statements·that | 5488 | The·SQLite·dialect·now·supports·UPDATE..FROM·syntax,·for·UPDATE·statements·that |
| 5481 | may·refer·to·additional·tables·within·the·WHERE·criteria·of·the·statement | 5489 | may·refer·to·additional·tables·within·the·WHERE·criteria·of·the·statement |
| 5482 | without·the·need·to·use·subqueries.·This·syntax·is·invoked·automatically·when | 5490 | without·the·need·to·use·subqueries.·This·syntax·is·invoked·automatically·when |
| 5483 | using·the·_\x8U_\x8p_\x8d_\x8a_\x8t_\x8e·construct·when·more·than·one·table·or·other·entity·or | 5491 | using·the·_\x8U_\x8p_\x8d_\x8a_\x8t_\x8e·construct·when·more·than·one·table·or·other·entity·or |
| 5484 | selectable·is·used. | 5492 | selectable·is·used. |
| 5485 | References:·_\x8#_\x87_\x81_\x88_\x85 | 5493 | References:·_\x8#_\x87_\x81_\x88_\x85 |
| Offset 5489, 22 lines modified | Offset 5497, 14 lines modified | ||
| 5489 | It·has·been·observed·that·the·previous·approach·of·defaulting·to·_\x8N_\x8u_\x8l_\x8l_\x8P_\x8o_\x8o_\x8l, | 5497 | It·has·been·observed·that·the·previous·approach·of·defaulting·to·_\x8N_\x8u_\x8l_\x8l_\x8P_\x8o_\x8o_\x8l, |
| 5490 | which·does·not·hold·onto·database·connections·after·they·are·released,·did·in | 5498 | which·does·not·hold·onto·database·connections·after·they·are·released,·did·in |
| 5491 | fact·have·a·measurable·negative·performance·impact.·As·always,·the·pool·class | 5499 | fact·have·a·measurable·negative·performance·impact.·As·always,·the·pool·class |
| 5492 | is·customizable·via·the·_\x8c_\x8r_\x8e_\x8a_\x8t_\x8e_\x8__\x8e_\x8n_\x8g_\x8i_\x8n_\x8e_\x8._\x8p_\x8o_\x8o_\x8l_\x8c_\x8l_\x8a_\x8s_\x8s·parameter. | 5500 | is·customizable·via·the·_\x8c_\x8r_\x8e_\x8a_\x8t_\x8e_\x8__\x8e_\x8n_\x8g_\x8i_\x8n_\x8e_\x8._\x8p_\x8o_\x8o_\x8l_\x8c_\x8l_\x8a_\x8s_\x8s·parameter. |
| 5493 | See·also | 5501 | See·also |
| 5494 | _\x8T_\x8h_\x8e_\x8·_\x8S_\x8Q_\x8L_\x8i_\x8t_\x8e_\x8·_\x8d_\x8i_\x8a_\x8l_\x8e_\x8c_\x8t_\x8·_\x8u_\x8s_\x8e_\x8s_\x8·_\x8Q_\x8u_\x8e_\x8u_\x8e_\x8P_\x8o_\x8o_\x8l_\x8·_\x8f_\x8o_\x8r_\x8·_\x8f_\x8i_\x8l_\x8e_\x8-_\x8b_\x8a_\x8s_\x8e_\x8d_\x8·_\x8d_\x8a_\x8t_\x8a_\x8b_\x8a_\x8s_\x8e_\x8s | 5502 | _\x8T_\x8h_\x8e_\x8·_\x8S_\x8Q_\x8L_\x8i_\x8t_\x8e_\x8·_\x8d_\x8i_\x8a_\x8l_\x8e_\x8c_\x8t_\x8·_\x8u_\x8s_\x8e_\x8s_\x8·_\x8Q_\x8u_\x8e_\x8u_\x8e_\x8P_\x8o_\x8o_\x8l_\x8·_\x8f_\x8o_\x8r_\x8·_\x8f_\x8i_\x8l_\x8e_\x8-_\x8b_\x8a_\x8s_\x8e_\x8d_\x8·_\x8d_\x8a_\x8t_\x8a_\x8b_\x8a_\x8s_\x8e_\x8s |
| 5495 | References:·_\x8#_\x87_\x84_\x89_\x80 | 5503 | References:·_\x8#_\x87_\x84_\x89_\x80 |
| 5496 | [\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¶ | ||
| 5497 | SQLite·datetime,·date,·and·time·datatypes·now·use·Python·standard·lib | ||
| 5498 | fromisoformat()·methods·in·order·to·parse·incoming·datetime,·date,·and·time | ||
| 5499 | string·values.·This·improves·performance·vs.·the·previous·regular·expression- | ||
| 5500 | based·approach,·and·also·automatically·accommodates·for·datetime·and·time | ||
| 5501 | formats·that·contain·either·a·six-digit·“microseconds”·format·or·a·three-digit | ||
| 5502 | “milliseconds”·format. | ||
| 5503 | References:·_\x8#_\x87_\x80_\x82_\x89 | ||
| 5504 | [\x8[s\x8sq\x8ql\x8li\x8it\x8te\x8e]\x8]·[\x8[b\x8bu\x8ug\x8g]\x8]·_\x8¶ | 5504 | [\x8[s\x8sq\x8ql\x8li\x8it\x8te\x8e]\x8]·[\x8[b\x8bu\x8ug\x8g]\x8]·_\x8¶ |
| 5505 | Removed·the·warning·that·emits·from·the·_\x8N_\x8u_\x8m_\x8e_\x8r_\x8i_\x8c·type·about·DBAPIs·not | 5505 | Removed·the·warning·that·emits·from·the·_\x8N_\x8u_\x8m_\x8e_\x8r_\x8i_\x8c·type·about·DBAPIs·not |
| 5506 | supporting·Decimal·values·natively.·This·warning·was·oriented·towards·SQLite, | 5506 | supporting·Decimal·values·natively.·This·warning·was·oriented·towards·SQLite, |
| 5507 | which·does·not·have·any·real·way·without·additional·extensions·or·workarounds | 5507 | which·does·not·have·any·real·way·without·additional·extensions·or·workarounds |
| 5508 | of·handling·precision·numeric·values·more·than·15·significant·digits·as·it·only | 5508 | of·handling·precision·numeric·values·more·than·15·significant·digits·as·it·only |
| 5509 | uses·floating·point·math·to·represent·numbers.·As·this·is·a·known·and | 5509 | uses·floating·point·math·to·represent·numbers.·As·this·is·a·known·and |
| 5510 | documented·limitation·in·SQLite·itself,·and·not·a·quirk·of·the·pysqlite·driver, | 5510 | 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/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> | ||
| 328 | </p></li> | ||
| 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> | ||
| 332 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/basic.html">basic.py</a>·-·Illustrates·the·asyncio·engine·/·connection·interface.</p> | ||
| 333 | </p></li> | ||
| 334 | <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 | 326 | <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 |
| 335 | of·ORM·collections·under·asyncio.</p> | 327 | of·ORM·collections·under·asyncio.</p> |
| 336 | </p></li> | 328 | </p></li> |
| 337 | <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> | 329 | <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> |
| 338 | along·many·asyncio·database·connections,·merging·ORM·results·into·a·single | 330 | along·many·asyncio·database·connections,·merging·ORM·results·into·a·single |
| 339 | <code·class="docutils·literal·notranslate"><span·class="pre">AsyncSession</span></code>.</p> | 331 | <code·class="docutils·literal·notranslate"><span·class="pre">AsyncSession</span></code>.</p> |
| 340 | </p></li> | 332 | </p></li> |
| 333 | <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 | ||
| 334 | for·asynchronous·ORM·use,·including·the·optional·run_sync()·method.</p> | ||
| 335 | </p></li> | ||
| 336 | <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 | ||
| 337 | for·asynchronous·ORM·use.</p> | ||
| 338 | </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 |
| Offset 378, 37 lines modified | Offset 378, 37 lines modified | ||
| 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_association.html">table_per_association.py</a>·-·Illustrates·a·mixin·which·provides·a·generic·association | ||
| 386 | via·a·individually·generated·association·tables·for·each·parent·class. | ||
| 387 | The·associated·objects·themselves·are·persisted·in·a·single·table | ||
| 388 | shared·among·all·parents.</p> | ||
| 389 | </p></li> | ||
| 385 | <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 | 390 | <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 |
| 386 | to·that·of·popular·frameworks·such·as·Django,·ROR,·etc.··This | 391 | to·that·of·popular·frameworks·such·as·Django,·ROR,·etc.··This |
| 387 | approach·bypasses·standard·referential·integrity | 392 | approach·bypasses·standard·referential·integrity |
| 388 | practices,·in·that·the·“foreign·key”·column·is·not·actually | 393 | practices,·in·that·the·“foreign·key”·column·is·not·actually |
| 389 | constrained·to·refer·to·any·particular·table;·instead, | 394 | constrained·to·refer·to·any·particular·table;·instead, |
| 390 | in-application·logic·is·used·to·determine·which·table·is·referenced.</p> | 395 | in-application·logic·is·used·to·determine·which·table·is·referenced.</p> |
| 391 | </p></li> | 396 | </p></li> |
| 392 | <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 | ||
| 393 | via·a·individually·generated·association·tables·for·each·parent·class. | ||
| 394 | The·associated·objects·themselves·are·persisted·in·a·single·table | ||
| 395 | shared·among·all·parents.</p> | ||
| 396 | </p></li> | ||
| 397 | <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 | ||
| 398 | objects·within·individual·tables,·each·one·generated·to·persist | ||
| 399 | those·objects·on·behalf·of·a·particular·parent·class.</p> | ||
| 400 | </p></li> | ||
| 401 | <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 | 397 | <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 |
| 402 | using·a·single·target·table·and·a·single·association·table, | 398 | using·a·single·target·table·and·a·single·association·table, |
| 403 | referred·to·by·all·parent·tables.··The·association·table | 399 | referred·to·by·all·parent·tables.··The·association·table |
| 404 | contains·a·“discriminator”·column·which·determines·what·type·of | 400 | contains·a·“discriminator”·column·which·determines·what·type·of |
| 405 | parent·object·associates·to·each·particular·row·in·the·association | 401 | parent·object·associates·to·each·particular·row·in·the·association |
| 406 | table.</p> | 402 | table.</p> |
| 407 | </p></li> | 403 | </p></li> |
| 404 | <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 | ||
| 405 | objects·within·individual·tables,·each·one·generated·to·persist | ||
| 406 | those·objects·on·behalf·of·a·particular·parent·class.</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/large_resultsets.html">large_resultsets.py</a>·-·In·this·series·of·tests,·we·are·looking·at·time·to·load·a·large·number | ||
| 485 | 484 | <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 | |
| 485 | record·by·primary·key</p> | ||
| 486 | </p></li> | ||
| 487 | <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> | ||
| 486 | </p></li> | 488 | </p></li> |
| 487 | <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 |
| 488 | within·a·distinct·transaction,·and·afterwards·returns·to·essentially·a | 490 | within·a·distinct·transaction,·and·afterwards·returns·to·essentially·a |
| 489 | “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 |
| 490 | a·database·connection,·inserts·the·row,·commits·and·closes.</p> | 492 | a·database·connection,·inserts·the·row,·commits·and·closes.</p> |
| 491 | </p></li> | 493 | </p></li> |
| 492 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/ | 494 | <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 | 495 | of·rows·in·bulk.</p> | |
| 494 | </p></li> | 496 | </p></li> |
| 495 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/_ | 497 | <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 |
| 498 | of·very·small·and·simple·rows.</p> | ||
| 496 | </p></li> | 499 | </p></li> |
| 497 | <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 |
| 498 | 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> |
| 499 | </p></li> | 502 | </p></li> |
| 500 | <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 | ||
| 501 | of·rows·in·bulk.</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 751, 31 lines modified | Offset 751, 31 lines modified | ||
| 751 | <p>Several·examples·that·illustrate·the·technique·of·intercepting·changes | 751 | <p>Several·examples·that·illustrate·the·technique·of·intercepting·changes |
| 752 | that·would·be·first·interpreted·as·an·UPDATE·on·a·row,·and·instead·turning | 752 | that·would·be·first·interpreted·as·an·UPDATE·on·a·row,·and·instead·turning |
| 753 | it·into·an·INSERT·of·a·new·row,·leaving·the·previous·row·intact·as | 753 | it·into·an·INSERT·of·a·new·row,·leaving·the·previous·row·intact·as |
| 754 | a·historical·version.</p> | 754 | a·historical·version.</p> |
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| 109 | optional. | 109 | optional. |
| 110 | _\x8b_\x8a_\x8s_\x8i_\x8c_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·-·Illustrate·a·many-to-many·relationship·between·an | 110 | _\x8b_\x8a_\x8s_\x8i_\x8c_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·-·Illustrate·a·many-to-many·relationship·between·an |
| 111 | “Order”·and·a·collection·of·“Item”·objects,·associating·a·purchase·price·with | 111 | “Order”·and·a·collection·of·“Item”·objects,·associating·a·purchase·price·with |
| 112 | each·via·an·association·object·called·“OrderItem” | 112 | each·via·an·association·object·called·“OrderItem” |
| 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 | ····*·_\x8a_\x8s_\x8y_\x8n_\x8c_\x8__\x8o_\x8r_\x8m_\x8._\x8p_\x8y·-·Illustrates·use·of·the·sqlalchemy.ext.asyncio.AsyncSession | ||
| 117 | ······object·for·asynchronous·ORM·use. | ||
| 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 | _\x8b_\x8a_\x8s_\x8i_\x8c_\x8._\x8p_\x8y·-·Illustrates·the·asyncio·engine·/·connection·interface. | ||
| 121 | _.a_.s_.y_.n_.c_.__.o_.r_.m_.__.w_.r_.i_.t_.e_.o_.n_.l_.y_.._.p_.y·-·Illustrates·using·w.wr.ri.it.te.e·o.on.nl.ly.y·r.re.el.la.at.ti.io.on.ns.sh.hi.ip.ps.s·fo | 116 | ····*·_.a_.s_.y_.n_.c_.__.o_.r_.m_.__.w_.r_.i_.t_.e_.o_.n_.l_.y_.._.p_.y·-·Illustrates·using·w.wr.ri.it.te.e·o.on.nl.ly.y·r.re.el.la.at.ti.io.on.ns.sh.hi.ip.ps.s·for |
| 122 | handling·of·ORM·collections·under·asyncio. | 117 | ······simpler·handling·of·ORM·collections·under·asyncio. |
| 123 | _\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 | 118 | _\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 |
| 124 | using·asyncio.gather()·along·many·asyncio·database·connections,·merging·ORM | 119 | using·asyncio.gather()·along·many·asyncio·database·connections,·merging·ORM |
| 125 | results·into·a·single·AsyncSession. | 120 | results·into·a·single·AsyncSession. |
| 121 | _\x8g_\x8r_\x8e_\x8e_\x8n_\x8l_\x8e_\x8t_\x8__\x8o_\x8r_\x8m_\x8._\x8p_\x8y·-·Illustrates·use·of·the·sqlalchemy.ext.asyncio.AsyncSession | ||
| 122 | object·for·asynchronous·ORM·use,·including·the·optional·run_sync()·method. | ||
| 123 | _\x8a_\x8s_\x8y_\x8n_\x8c_\x8__\x8o_\x8r_\x8m_\x8._\x8p_\x8y·-·Illustrates·use·of·the·sqlalchemy.ext.asyncio.AsyncSession | ||
| 124 | object·for·asynchronous·ORM·use. | ||
| 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* | 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 | An·example·of·persistence·for·a·directed·graph·structure.·The·graph·is·stored | 127 | 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 | 128 | 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- | 129 | in·a·table·of·nodes.·Basic·persistence·and·querying·for·lower-·and·upper- |
| 130 | neighbors·are·illustrated: | 130 | neighbors·are·illustrated: |
| 131 | n2·=·Node(2) | 131 | n2·=·Node(2) |
| 132 | n5·=·Node(5) | 132 | n5·=·Node(5) |
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| 148 | Supplier,·both·subclassing·the·HasAddresses·mixin,·which·ensures·that·the | 148 | Supplier,·both·subclassing·the·HasAddresses·mixin,·which·ensures·that·the |
| 149 | parent·class·is·provided·with·an·addresses·collection·which·contains·Address | 149 | parent·class·is·provided·with·an·addresses·collection·which·contains·Address |
| 150 | objects. | 150 | 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 | 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 | 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 | 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 | _\x8w_\x8i_\x8t_\x8h_\x8·_\x8S_\x8Q_\x8L_\x8A_\x8l_\x8c_\x8h_\x8e_\x8m_\x8y. | 153 | _\x8w_\x8i_\x8t_\x8h_\x8·_\x8S_\x8Q_\x8L_\x8A_\x8l_\x8c_\x8h_\x8e_\x8m_\x8y. |
| 154 | Listing·of·files: | 154 | Listing·of·files: |
| 155 | ····*·_\x8g_\x8e_\x8n_\x8e_\x8r_\x8i_\x8c_\x8__\x8f_\x8k_\x8._\x8p_\x8y·-·Illustrates·a·so-called·“generic·foreign·key”,·in·a | ||
| 156 | ······similar·fashion·to·that·of·popular·frameworks·such·as·Django,·ROR,·etc. | ||
| 157 | ······This·approach·bypasses·standard·referential·integrity·practices,·in·that | ||
| 158 | ······the·“foreign·key”·column·is·not·actually·constrained·to·refer·to·any | ||
| 159 | ······particular·table;·instead,·in-application·logic·is·used·to·determine | ||
| 160 | ······which·table·is·referenced. | ||
| 161 | _\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 | 155 | ····*·_\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 |
| 162 | association·via·a·individually·generated·association·tables·for·each | 156 | ······association·via·a·individually·generated·association·tables·for·each |
| 163 | class.·The·associated·objects·themselves·are·persisted·in·a·sing | 157 | ······parent·class.·The·associated·objects·themselves·are·persisted·in·a·single |
| 164 | among·all·parents. | ||
| 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 | 158 | ······table·shared·among·all·parents. | |
| 159 | _\x8g_\x8e_\x8n_\x8e_\x8r_\x8i_\x8c_\x8__\x8f_\x8k_\x8._\x8p_\x8y·-·Illustrates·a·so-called·“generic·foreign·key”,·in·a·similar | ||
| 160 | fashion·to·that·of·popular·frameworks·such·as·Django,·ROR,·etc.·This·approach | ||
| 161 | bypasses·standard·referential·integrity·practices,·in·that·the·“foreign·key” | ||
| 162 | column·is·not·actually·constrained·to·refer·to·any·particular·table;·instead, | ||
| 163 | in-application·logic·is·used·to·determine·which·table·is·referenced. | ||
| 168 | _\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·-·Illustrates·a·mixin·which·provides·a·generic | 164 | _\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·-·Illustrates·a·mixin·which·provides·a·generic |
| 169 | association·using·a·single·target·table·and·a·single·association·table, | 165 | association·using·a·single·target·table·and·a·single·association·table, |
| 170 | referred·to·by·all·parent·tables.·The·association·table·contains·a | 166 | referred·to·by·all·parent·tables.·The·association·table·contains·a |
| 171 | “discriminator”·column·which·determines·what·type·of·parent·object·associates | 167 | “discriminator”·column·which·determines·what·type·of·parent·object·associates |
| 172 | to·each·particular·row·in·the·association·table. | 168 | to·each·particular·row·in·the·association·table. |
| 169 | _\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 | ||
| 170 | association·objects·within·individual·tables,·each·one·generated·to·persist | ||
| 171 | those·objects·on·behalf·of·a·particular·parent·class. | ||
| 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* | 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* |
| 174 | Illustrates·the·“materialized·paths”·pattern·for·hierarchical·data·using·the | 173 | Illustrates·the·“materialized·paths”·pattern·for·hierarchical·data·using·the |
| 175 | SQLAlchemy·ORM. | 174 | SQLAlchemy·ORM. |
| 176 | Listing·of·files: | 175 | Listing·of·files: |
| 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. | 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. |
| 178 | *\x8**\x8**\x8**\x8*·N\x8Ne\x8es\x8st\x8te\x8ed\x8d·S\x8Se\x8et\x8ts\x8s_\x8?\x8¶·*\x8**\x8**\x8**\x8* | 177 | *\x8**\x8**\x8**\x8*·N\x8Ne\x8es\x8st\x8te\x8ed\x8d·S\x8Se\x8et\x8ts\x8s_\x8?\x8¶·*\x8**\x8**\x8**\x8* |
| 179 | Illustrates·a·rudimentary·way·to·implement·the·“nested·sets”·pattern·for | 178 | Illustrates·a·rudimentary·way·to·implement·the·“nested·sets”·pattern·for |
| Offset 221, 28 lines modified | Offset 220, 28 lines modified | ||
| 221 | $·python·-m·examples.performance·bulk_inserts·\ | 220 | $·python·-m·examples.performance·bulk_inserts·\ |
| 222 | ····--dburl·mysql+mysqldb://scott:tiger@localhost/test·\ | 221 | ····--dburl·mysql+mysqldb://scott:tiger@localhost/test·\ |
| 223 | ····--profile·--num·1000 | 222 | ····--profile·--num·1000 |
| 224 | See·also | 223 | See·also |
| 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? | 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? |
| 226 | *\x8**\x8**\x8*·F\x8Fi\x8il\x8le\x8e·L\x8Li\x8is\x8st\x8ti\x8in\x8ng\x8g_\x8?\x8¶·*\x8**\x8**\x8* | 225 | *\x8**\x8**\x8*·F\x8Fi\x8il\x8le\x8e·L\x8Li\x8is\x8st\x8ti\x8in\x8ng\x8g_\x8?\x8¶·*\x8**\x8**\x8* |
| 227 | Listing·of·files: | 226 | Listing·of·files: |
| 228 | ····*·_\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 | ||
| 229 | ····· | 227 | ····*·_.s_.h_.o_.r_.t_.__.s_.e_.l_.e_.c_.t_.s_.._.p_.y·-·This·series·of·tests·illustrates·different·ways·to |
| 228 | ······SELECT·a·single·record·by·primary·key | ||
| 229 | _\x8__\x8__\x8m_\x8a_\x8i_\x8n_\x8__\x8__\x8._\x8p_\x8y·-·Allows·the·examples/performance·package·to·be·run·as·a·script. | ||
| 230 | _\x8s_\x8i_\x8n_\x8g_\x8l_\x8e_\x8__\x8i_\x8n_\x8s_\x8e_\x8r_\x8t_\x8s_\x8._\x8p_\x8y·-·In·this·series·of·tests,·we’re·looking·at·a·method·that | 230 | _\x8s_\x8i_\x8n_\x8g_\x8l_\x8e_\x8__\x8i_\x8n_\x8s_\x8e_\x8r_\x8t_\x8s_\x8._\x8p_\x8y·-·In·this·series·of·tests,·we’re·looking·at·a·method·that |
| 231 | inserts·a·row·within·a·distinct·transaction,·and·afterwards·returns·to | 231 | inserts·a·row·within·a·distinct·transaction,·and·afterwards·returns·to |
| 232 | essentially·a·“closed”·state.·This·would·be·analogous·to·an·API·call·that | 232 | essentially·a·“closed”·state.·This·would·be·analogous·to·an·API·call·that |
| 233 | starts·up·a·database·connection,·inserts·the·row,·commits·and·closes. | 233 | starts·up·a·database·connection,·inserts·the·row,·commits·and·closes. |
| 234 | _\x8 | 234 | _\x8b_.u_.l_.k_.__.i_.n_.s_.e_.r_.t_.s_.._.p_.y·-·This·series·of·tests·illustrates·different·ways·to·INSERT·a |
| 235 | single·record·by·primary·key | ||
| 236 | 235 | large·number·of·rows·in·bulk. | |
| 236 | _\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 | ||
| 237 | large·number·of·very·small·and·simple·rows. | ||
| 237 | _\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 | 238 | _\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 |
| 238 | a·large·number·of·rows·in·bulk·(under·construction!·there’s·just·one·test·at | 239 | a·large·number·of·rows·in·bulk·(under·construction!·there’s·just·one·test·at |
| 239 | the·moment) | 240 | the·moment) |
| 240 | _\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 | ||
| 241 | large·number·of·rows·in·bulk. | ||
| 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* | 241 | *\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: | 242 | This·is·the·default·form·of·run: |
| 244 | $·python·-m·examples.performance·single_inserts | 243 | $·python·-m·examples.performance·single_inserts |
| 245 | Tests·to·run:·test_orm_commit,·test_bulk_save, | 244 | Tests·to·run:·test_orm_commit,·test_bulk_save, |
| 246 | ··············test_bulk_insert_dictionaries,·test_core, | 245 | ··············test_bulk_insert_dictionaries,·test_core, |
| 247 | ··············test_core_query_caching,·test_dbapi_raw_w_connect, | 246 | ··············test_core_query_caching,·test_dbapi_raw_w_connect, |
| 248 | ··············test_dbapi_raw_w_pool | 247 | ··············test_dbapi_raw_w_pool |
| Offset 468, 28 lines modified | Offset 467, 28 lines modified | ||
| 468 | Several·examples·that·illustrate·the·technique·of·intercepting·changes·that | 467 | Several·examples·that·illustrate·the·technique·of·intercepting·changes·that |
| 469 | would·be·first·interpreted·as·an·UPDATE·on·a·row,·and·instead·turning·it·into | 468 | would·be·first·interpreted·as·an·UPDATE·on·a·row,·and·instead·turning·it·into |
| 470 | an·INSERT·of·a·new·row,·leaving·the·previous·row·intact·as·a·historical | 469 | an·INSERT·of·a·new·row,·leaving·the·previous·row·intact·as·a·historical |
| 471 | version. | 470 | version. |
| 472 | 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 | 471 | 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 |
| 473 | row·to·a·separate·history·table. | 472 | row·to·a·separate·history·table. |
| 474 | Listing·of·files: | 473 | Listing·of·files: |
| 475 | ····*·_\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 | ||
| 476 | ······on·objects,·turning·an·UPDATE·statement·on·a·single·row·into·an·INSERT | ||
| 477 | ······statement,·so·that·a·new·row·is·inserted·with·the·new·data,·keeping·the | ||
| 478 | ······old·row·intact. | ||
| 479 | _.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 | 474 | ····*·_.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 |
| 480 | of·versioned_rows.py,·but·also·emits·an·UPDATE·on·the·o.ol.ld.d·row | 475 | ······technique·of·versioned_rows.py,·but·also·emits·an·UPDATE·on·the·o.ol.ld.d·row |
| 476 | ······to·affect·a·change·in·timestamp.·Also·includes·a | ||
| 481 | 477 | ······_.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 | |
| 478 | ······recent·version. | ||
| 482 | limit·queries·to·only·the·most·recent·version. | ||
| 483 | _\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, | ||
| 484 | turning·an·UPDATE·statement·on·a·single·row·into·an·INSERT·statement,·so·that·a | ||
| 485 | new·row·is·inserted·with·the·new·data,·keeping·the·old·row·intact. | ||
| 486 | _\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 | 479 | _\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 |
| 487 | concept·of·a·“vertical·table”·structure,·like·those·illustrated·in·_\x8V_\x8e_\x8r_\x8t_\x8i_\x8c_\x8a_\x8l | 480 | concept·of·a·“vertical·table”·structure,·like·those·illustrated·in·_\x8V_\x8e_\x8r_\x8t_\x8i_\x8c_\x8a_\x8l |
| 488 | _\x8A_\x8t_\x8t_\x8r_\x8i_\x8b_\x8u_\x8t_\x8e_\x8·_\x8M_\x8a_\x8p_\x8p_\x8i_\x8n_\x8g·examples. | 481 | _\x8A_\x8t_\x8t_\x8r_\x8i_\x8b_\x8u_\x8t_\x8e_\x8·_\x8M_\x8a_\x8p_\x8p_\x8i_\x8n_\x8g·examples. |
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