Examples illustrating the usage of the “association object” pattern, │ │ │ where an intermediary class mediates the relationship between two │ │ │ classes that are associated in a many-to-many pattern.
│ │ │Listing of files:
proxied_association.py - Same example as basic_association, adding in
│ │ │ -usage of sqlalchemy.ext.associationproxy to make explicit references
│ │ │ -to OrderItem optional.
dict_of_sets_with_default.py - An advanced association proxy example which │ │ │ illustrates nesting of association proxies to produce multi-level Python │ │ │ collections, in this case a dictionary with string keys and sets of integers │ │ │ as values, which conceal the underlying mapped classes.
│ │ │basic_association.py - Illustrate a many-to-many relationship between an │ │ │ “Order” and a collection of “Item” objects, associating a purchase price │ │ │ with each via an association object called “OrderItem”
│ │ │proxied_association.py - Same example as basic_association, adding in
│ │ │ +usage of sqlalchemy.ext.associationproxy to make explicit references
│ │ │ +to OrderItem optional.
Examples illustrating the asyncio engine feature of SQLAlchemy.
│ │ │Listing of files:
greenlet_orm.py - Illustrates use of the sqlalchemy.ext.asyncio.AsyncSession object │ │ │ for asynchronous ORM use, including the optional run_sync() method.
│ │ │basic.py - Illustrates the asyncio engine / connection interface.
│ │ │ +gather_orm_statements.py - Illustrates how to run many statements concurrently using asyncio.gather()
│ │ │ along many asyncio database connections, merging ORM results into a single
│ │ │ AsyncSession.
basic.py - Illustrates the asyncio engine / connection interface.
│ │ │ +async_orm.py - Illustrates use of the sqlalchemy.ext.asyncio.AsyncSession object
│ │ │ +for asynchronous ORM use.
async_orm_writeonly.py - Illustrates using write only relationships for simpler handling │ │ │ of ORM collections under asyncio.
│ │ │async_orm.py - Illustrates use of the sqlalchemy.ext.asyncio.AsyncSession object
│ │ │ -for asynchronous ORM use.
An example of persistence for a directed graph structure. The
│ │ │ graph is stored as a collection of edges, each referencing both a
│ │ │ @@ -378,30 +378,30 @@
│ │ │ subclassing the HasAddresses mixin, which ensures that the
│ │ │ parent class is provided with an addresses collection
│ │ │ which contains Address objects.
The discriminator_on_association.py and generic_fk.py scripts │ │ │ are modernized versions of recipes presented in the 2007 blog post │ │ │ Polymorphic Associations with SQLAlchemy.
│ │ │Listing of files:
table_per_related.py - Illustrates a generic association which persists association │ │ │ -objects within individual tables, each one generated to persist │ │ │ -those objects on behalf of a particular parent class.
│ │ │ -table_per_association.py - Illustrates a mixin which provides a generic association │ │ │ -via a individually generated association tables for each parent class. │ │ │ -The associated objects themselves are persisted in a single table │ │ │ -shared among all parents.
│ │ │ -generic_fk.py - Illustrates a so-called “generic foreign key”, in a similar fashion │ │ │ to that of popular frameworks such as Django, ROR, etc. This │ │ │ approach bypasses standard referential integrity │ │ │ practices, in that the “foreign key” column is not actually │ │ │ constrained to refer to any particular table; instead, │ │ │ in-application logic is used to determine which table is referenced.
│ │ │table_per_association.py - Illustrates a mixin which provides a generic association │ │ │ +via a individually generated association tables for each parent class. │ │ │ +The associated objects themselves are persisted in a single table │ │ │ +shared among all parents.
│ │ │ +table_per_related.py - Illustrates a generic association which persists association │ │ │ +objects within individual tables, each one generated to persist │ │ │ +those objects on behalf of a particular parent class.
│ │ │ +discriminator_on_association.py - Illustrates a mixin which provides a generic association │ │ │ using a single target table and a single association table, │ │ │ referred to by all parent tables. The association table │ │ │ contains a “discriminator” column which determines what type of │ │ │ parent object associates to each particular row in the association │ │ │ table.
│ │ │See also
│ │ │ │ │ │Listing of files:
__main__.py - Allows the examples/performance package to be run as a script.
│ │ │ +short_selects.py - This series of tests illustrates different ways to SELECT a single │ │ │ +record by primary key
│ │ │ +single_inserts.py - In this series of tests, we’re looking at a method that inserts a row │ │ │ within a distinct transaction, and afterwards returns to essentially a │ │ │ “closed” state. This would be analogous to an API call that starts up │ │ │ a database connection, inserts the row, commits and closes.
│ │ │short_selects.py - This series of tests illustrates different ways to SELECT a single │ │ │ -record by primary key
│ │ │ -large_resultsets.py - In this series of tests, we are looking at time to load a large number │ │ │ of very small and simple rows.
│ │ │bulk_updates.py - This series of tests will illustrate different ways to UPDATE a large number │ │ │ -of rows in bulk (under construction! there’s just one test at the moment)
│ │ │ -bulk_inserts.py - This series of tests illustrates different ways to INSERT a large number │ │ │ of rows in bulk.
│ │ │__main__.py - Allows the examples/performance package to be run as a script.
│ │ │ +bulk_updates.py - This series of tests will illustrate different ways to UPDATE a large number │ │ │ +of rows in bulk (under construction! there’s just one test at the moment)
│ │ │This is the default form of run:
│ │ │ @@ -761,26 +761,26 @@ │ │ │ history row to a separate history table. │ │ │Listing of files:
versioned_update_old_row.py - Illustrates the same UPDATE into INSERT technique of versioned_rows.py,
│ │ │ but also emits an UPDATE on the old row to affect a change in timestamp.
│ │ │ Also includes a SessionEvents.do_orm_execute() hook to limit queries
│ │ │ to only the most recent version.
versioned_rows_w_versionid.py - Illustrates a method to intercept changes on objects, turning │ │ │ -an UPDATE statement on a single row into an INSERT statement, so that a new │ │ │ -row is inserted with the new data, keeping the old row intact.
│ │ │ -versioned_rows.py - Illustrates a method to intercept changes on objects, turning │ │ │ an UPDATE statement on a single row into an INSERT statement, so that a new │ │ │ row is inserted with the new data, keeping the old row intact.
│ │ │versioned_map.py - A variant of the versioned_rows example built around the │ │ │ concept of a “vertical table” structure, like those illustrated in │ │ │ Vertical Attribute Mapping examples.
│ │ │versioned_rows_w_versionid.py - Illustrates a method to intercept changes on objects, turning │ │ │ +an UPDATE statement on a single row into an INSERT statement, so that a new │ │ │ +row is inserted with the new data, keeping the old row intact.
│ │ │ +Illustrates “vertical table” mappings.
│ │ │ @@ -821,37 +821,37 @@ │ │ │Working examples of single-table, joined-table, and concrete-table │ │ │ inheritance as described in Mapping Class Inheritance Hierarchies.
│ │ │Listing of files:
concrete.py - Concrete-table (table-per-class) inheritance example.
│ │ │ +single.py - Single-table (table-per-hierarchy) inheritance example.
│ │ │joined.py - Joined-table (table-per-subclass) inheritance example.
│ │ │concrete.py - Concrete-table (table-per-class) inheritance example.
│ │ │ -Examples illustrating modifications to SQLAlchemy’s attribute management │ │ │ system.
│ │ │Listing of files:
listen_for_events.py - Illustrates how to attach events to all instrumented attributes │ │ │ -and listen for change events.
│ │ │ -custom_management.py - Illustrates customized class instrumentation, using
│ │ │ the sqlalchemy.ext.instrumentation extension package.
listen_for_events.py - Illustrates how to attach events to all instrumented attributes │ │ │ +and listen for change events.
│ │ │ +active_column_defaults.py - Illustrates use of the AttributeEvents.init_scalar()
│ │ │ event, in conjunction with Core column defaults to provide
│ │ │ ORM objects that automatically produce the default value
│ │ │ when an un-set attribute is accessed.
The construction of generic sharding routines is an ambitious approach │ │ │ to the issue of organizing instances among multiple databases. For a │ │ │ more plain-spoken alternative, the “distinct entity” approach │ │ │ is a simple method of assigning objects to different tables (and potentially │ │ │ database nodes) in an explicit way - described on the wiki at │ │ │ EntityName.
│ │ │Listing of files:
separate_databases.py - Illustrates sharding using distinct SQLite databases.
│ │ │ +separate_tables.py - Illustrates sharding using a single SQLite database, that will however │ │ │ have multiple tables using a naming convention.
│ │ │separate_schema_translates.py - Illustrates sharding using a single database with multiple schemas, │ │ │ where a different “schema_translates_map” can be used for each shard.
│ │ │separate_databases.py - Illustrates sharding using distinct SQLite databases.
│ │ │ -asyncio.py - Illustrates sharding API used with asyncio.
│ │ │Examples include demonstrations of the with_loader_criteria()
│ │ │ option as well as the SessionEvents.do_orm_execute() hook.
As of SQLAlchemy 1.4, the Query construct is unified
│ │ │ with the Select construct, so that these two objects
│ │ │ are mostly the same.
Listing of files:
filter_public.py - Illustrates a global criteria applied to entities of a particular type.
│ │ │ +temporal_range.py - Illustrates a custom per-query criteria that will be applied │ │ │ to selected entities.
│ │ │filter_public.py - Illustrates a global criteria applied to entities of a particular type.
│ │ │ -Illustrates how to embed │ │ │ dogpile.cache │ │ │ ├── html2text {} │ │ │ │ @@ -96,38 +96,38 @@ │ │ │ │ Listing of files: │ │ │ │ * _a_d_j_a_c_e_n_c_y___l_i_s_t_._p_y │ │ │ │ ******** AAssssoocciiaattiioonnss_?¶ ******** │ │ │ │ Examples illustrating the usage of the “association object” pattern, where an │ │ │ │ intermediary class mediates the relationship between two classes that are │ │ │ │ associated in a many-to-many pattern. │ │ │ │ Listing of files: │ │ │ │ - * _p_r_o_x_i_e_d___a_s_s_o_c_i_a_t_i_o_n_._p_y - Same example as basic_association, adding in │ │ │ │ - usage of _s_q_l_a_l_c_h_e_m_y_._e_x_t_._a_s_s_o_c_i_a_t_i_o_n_p_r_o_x_y to make explicit references to │ │ │ │ - OrderItem optional. │ │ │ │ -_d_i_c_t___o_f___s_e_t_s___w_i_t_h___d_e_f_a_u_l_t_._p_y - An advanced association proxy example which │ │ │ │ -illustrates nesting of association proxies to produce multi-level Python │ │ │ │ -collections, in this case a dictionary with string keys and sets of integers as │ │ │ │ -values, which conceal the underlying mapped classes. │ │ │ │ + * _d_i_c_t___o_f___s_e_t_s___w_i_t_h___d_e_f_a_u_l_t_._p_y - An advanced association proxy example │ │ │ │ + which illustrates nesting of association proxies to produce multi-level │ │ │ │ + Python collections, in this case a dictionary with string keys and sets │ │ │ │ + of integers as values, which conceal the underlying mapped classes. │ │ │ │ _b_a_s_i_c___a_s_s_o_c_i_a_t_i_o_n_._p_y - Illustrate a many-to-many relationship between an │ │ │ │ “Order” and a collection of “Item” objects, associating a purchase price with │ │ │ │ each via an association object called “OrderItem” │ │ │ │ +_p_r_o_x_i_e_d___a_s_s_o_c_i_a_t_i_o_n_._p_y - Same example as basic_association, adding in usage of │ │ │ │ +_s_q_l_a_l_c_h_e_m_y_._e_x_t_._a_s_s_o_c_i_a_t_i_o_n_p_r_o_x_y to make explicit references to OrderItem │ │ │ │ +optional. │ │ │ │ ******** AAssyynncciioo IInntteeggrraattiioonn_?¶ ******** │ │ │ │ Examples illustrating the asyncio engine feature of SQLAlchemy. │ │ │ │ Listing of files: │ │ │ │ * _g_r_e_e_n_l_e_t___o_r_m_._p_y - Illustrates use of the │ │ │ │ sqlalchemy.ext.asyncio.AsyncSession object for asynchronous ORM use, │ │ │ │ including the optional run_sync() method. │ │ │ │ +_b_a_s_i_c_._p_y - Illustrates the asyncio engine / connection interface. │ │ │ │ _g_a_t_h_e_r___o_r_m___s_t_a_t_e_m_e_n_t_s_._p_y - Illustrates how to run many statements concurrently │ │ │ │ using asyncio.gather() along many asyncio database connections, merging ORM │ │ │ │ results into a single AsyncSession. │ │ │ │ -_b_a_s_i_c_._p_y - Illustrates the asyncio engine / connection interface. │ │ │ │ -_a_s_y_n_c___o_r_m___w_r_i_t_e_o_n_l_y_._p_y - Illustrates using wwrriittee oonnllyy rreellaattiioonnsshhiippss for simpler │ │ │ │ -handling of ORM collections under asyncio. │ │ │ │ _a_s_y_n_c___o_r_m_._p_y - Illustrates use of the sqlalchemy.ext.asyncio.AsyncSession │ │ │ │ object for asynchronous ORM use. │ │ │ │ +_a_s_y_n_c___o_r_m___w_r_i_t_e_o_n_l_y_._p_y - Illustrates using wwrriittee oonnllyy rreellaattiioonnsshhiippss for simpler │ │ │ │ +handling of ORM collections under asyncio. │ │ │ │ ******** DDiirreecctteedd GGrraapphhss_?¶ ******** │ │ │ │ An example of persistence for a directed graph structure. The graph is stored │ │ │ │ as a collection of edges, each referencing both a “lower” and an “upper” node │ │ │ │ in a table of nodes. Basic persistence and querying for lower- and upper- │ │ │ │ neighbors are illustrated: │ │ │ │ n2 = Node(2) │ │ │ │ n5 = Node(5) │ │ │ │ @@ -149,26 +149,27 @@ │ │ │ │ Supplier, both subclassing the HasAddresses mixin, which ensures that the │ │ │ │ parent class is provided with an addresses collection which contains Address │ │ │ │ objects. │ │ │ │ The _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 and _g_e_n_e_r_i_c___f_k_._p_y scripts are modernized │ │ │ │ versions of recipes presented in the 2007 blog post _P_o_l_y_m_o_r_p_h_i_c_ _A_s_s_o_c_i_a_t_i_o_n_s │ │ │ │ _w_i_t_h_ _S_Q_L_A_l_c_h_e_m_y. │ │ │ │ Listing of files: │ │ │ │ - * _t_a_b_l_e___p_e_r___r_e_l_a_t_e_d_._p_y - Illustrates a generic association which persists │ │ │ │ - association objects within individual tables, each one generated to │ │ │ │ - persist those objects on behalf of a particular parent class. │ │ │ │ + * _g_e_n_e_r_i_c___f_k_._p_y - Illustrates a so-called “generic foreign key”, in a │ │ │ │ + similar fashion to that of popular frameworks such as Django, ROR, etc. │ │ │ │ + This approach bypasses standard referential integrity practices, in that │ │ │ │ + the “foreign key” column is not actually constrained to refer to any │ │ │ │ + particular table; instead, in-application logic is used to determine │ │ │ │ + which table is referenced. │ │ │ │ _t_a_b_l_e___p_e_r___a_s_s_o_c_i_a_t_i_o_n_._p_y - Illustrates a mixin which provides a generic │ │ │ │ association via a individually generated association tables for each parent │ │ │ │ class. The associated objects themselves are persisted in a single table shared │ │ │ │ among all parents. │ │ │ │ -_g_e_n_e_r_i_c___f_k_._p_y - Illustrates a so-called “generic foreign key”, in a similar │ │ │ │ -fashion to that of popular frameworks such as Django, ROR, etc. This approach │ │ │ │ -bypasses standard referential integrity practices, in that the “foreign key” │ │ │ │ -column is not actually constrained to refer to any particular table; instead, │ │ │ │ -in-application logic is used to determine which table is referenced. │ │ │ │ +_t_a_b_l_e___p_e_r___r_e_l_a_t_e_d_._p_y - Illustrates a generic association which persists │ │ │ │ +association objects within individual tables, each one generated to persist │ │ │ │ +those objects on behalf of a particular parent class. │ │ │ │ _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 │ │ │ │ association using a single target table and a single association table, │ │ │ │ referred to by all parent tables. The association table contains a │ │ │ │ “discriminator” column which determines what type of parent object associates │ │ │ │ to each particular row in the association table. │ │ │ │ ******** MMaatteerriiaalliizzeedd PPaatthhss_?¶ ******** │ │ │ │ Illustrates the “materialized paths” pattern for hierarchical data using the │ │ │ │ @@ -221,29 +222,29 @@ │ │ │ │ $ python -m examples.performance bulk_inserts \ │ │ │ │ --dburl mysql+mysqldb://scott:tiger@localhost/test \ │ │ │ │ --profile --num 1000 │ │ │ │ See also │ │ │ │ _H_o_w_ _c_a_n_ _I_ _p_r_o_f_i_l_e_ _a_ _S_Q_L_A_l_c_h_e_m_y_ _p_o_w_e_r_e_d_ _a_p_p_l_i_c_a_t_i_o_n_? │ │ │ │ ****** FFiillee LLiissttiinngg_?¶ ****** │ │ │ │ Listing of files: │ │ │ │ - * _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 inserts a row within a distinct transaction, and afterwards returns │ │ │ │ - to essentially a “closed” state. This would be analogous to an API call │ │ │ │ - that starts up a database connection, inserts the row, commits and │ │ │ │ - closes. │ │ │ │ + * _____m_a_i_n_____._p_y - Allows the examples/performance package to be run as a │ │ │ │ + script. │ │ │ │ _s_h_o_r_t___s_e_l_e_c_t_s_._p_y - This series of tests illustrates different ways to SELECT a │ │ │ │ single record by primary key │ │ │ │ +_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 │ │ │ │ +inserts a row within a distinct transaction, and afterwards returns to │ │ │ │ +essentially a “closed” state. This would be analogous to an API call that │ │ │ │ +starts up a database connection, inserts the row, commits and closes. │ │ │ │ _l_a_r_g_e___r_e_s_u_l_t_s_e_t_s_._p_y - In this series of tests, we are looking at time to load a │ │ │ │ large number of very small and simple rows. │ │ │ │ +_b_u_l_k___i_n_s_e_r_t_s_._p_y - This series of tests illustrates different ways to INSERT a │ │ │ │ +large number of rows in bulk. │ │ │ │ _b_u_l_k___u_p_d_a_t_e_s_._p_y - This series of tests will illustrate different ways to UPDATE │ │ │ │ a large number of rows in bulk (under construction! there’s just one test at │ │ │ │ the moment) │ │ │ │ -_b_u_l_k___i_n_s_e_r_t_s_._p_y - This series of tests illustrates different ways to INSERT a │ │ │ │ -large number of rows in bulk. │ │ │ │ -_____m_a_i_n_____._p_y - Allows the examples/performance package to be run as a script. │ │ │ │ ****** RRuunnnniinngg aallll tteessttss wwiitthh ttiimmee_?¶ ****** │ │ │ │ This is the default form of run: │ │ │ │ $ python -m examples.performance single_inserts │ │ │ │ Tests to run: test_orm_commit, test_bulk_save, │ │ │ │ test_bulk_insert_dictionaries, test_core, │ │ │ │ test_core_query_caching, test_dbapi_raw_w_connect, │ │ │ │ test_dbapi_raw_w_pool │ │ │ │ @@ -479,23 +480,23 @@ │ │ │ │ row to a separate history table. │ │ │ │ Listing of files: │ │ │ │ * _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 │ │ │ │ technique of versioned_rows.py, but also emits an UPDATE on the oolldd row │ │ │ │ to affect a change in timestamp. Also includes a │ │ │ │ _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 │ │ │ │ recent version. │ │ │ │ -_v_e_r_s_i_o_n_e_d___r_o_w_s___w___v_e_r_s_i_o_n_i_d_._p_y - Illustrates a method to intercept changes on │ │ │ │ -objects, turning an UPDATE statement on a single row into an INSERT statement, │ │ │ │ -so that a new row is inserted with the new data, keeping the old row intact. │ │ │ │ _v_e_r_s_i_o_n_e_d___r_o_w_s_._p_y - Illustrates a method to intercept changes on objects, │ │ │ │ turning an UPDATE statement on a single row into an INSERT statement, so that a │ │ │ │ new row is inserted with the new data, keeping the old row intact. │ │ │ │ _v_e_r_s_i_o_n_e_d___m_a_p_._p_y - A variant of the versioned_rows example built around the │ │ │ │ concept of a “vertical table” structure, like those illustrated in _V_e_r_t_i_c_a_l │ │ │ │ _A_t_t_r_i_b_u_t_e_ _M_a_p_p_i_n_g examples. │ │ │ │ +_v_e_r_s_i_o_n_e_d___r_o_w_s___w___v_e_r_s_i_o_n_i_d_._p_y - Illustrates a method to intercept changes on │ │ │ │ +objects, turning an UPDATE statement on a single row into an INSERT statement, │ │ │ │ +so that a new row is inserted with the new data, keeping the old row intact. │ │ │ │ ******** VVeerrttiiccaall AAttttrriibbuuttee MMaappppiinngg_?¶ ******** │ │ │ │ Illustrates “vertical table” mappings. │ │ │ │ A “vertical table” refers to a technique where individual attributes of an │ │ │ │ object are stored as distinct rows in a table. The “vertical table” technique │ │ │ │ is used to persist objects which can have a varied set of attributes, at the │ │ │ │ expense of simple query control and brevity. It is commonly found in content/ │ │ │ │ document management systems in order to represent user-created structures │ │ │ │ @@ -523,26 +524,26 @@ │ │ │ │ _d_i_c_t_l_i_k_e_-_p_o_l_y_m_o_r_p_h_i_c_._p_y - Mapping a polymorphic-valued vertical table as a │ │ │ │ dictionary. │ │ │ │ ********** IInnhheerriittaannccee MMaappppiinngg RReecciippeess_?¶ ********** │ │ │ │ ******** BBaassiicc IInnhheerriittaannccee MMaappppiinnggss_?¶ ******** │ │ │ │ Working examples of single-table, joined-table, and concrete-table inheritance │ │ │ │ as described in _M_a_p_p_i_n_g_ _C_l_a_s_s_ _I_n_h_e_r_i_t_a_n_c_e_ _H_i_e_r_a_r_c_h_i_e_s. │ │ │ │ Listing of files: │ │ │ │ - * _s_i_n_g_l_e_._p_y - Single-table (table-per-hierarchy) inheritance example. │ │ │ │ + * _c_o_n_c_r_e_t_e_._p_y - Concrete-table (table-per-class) inheritance example. │ │ │ │ +_s_i_n_g_l_e_._p_y - Single-table (table-per-hierarchy) inheritance example. │ │ │ │ _j_o_i_n_e_d_._p_y - Joined-table (table-per-subclass) inheritance example. │ │ │ │ -_c_o_n_c_r_e_t_e_._p_y - Concrete-table (table-per-class) inheritance example. │ │ │ │ ********** SSppeecciiaall AAPPIIss_?¶ ********** │ │ │ │ ******** AAttttrriibbuuttee IInnssttrruummeennttaattiioonn_?¶ ******** │ │ │ │ Examples illustrating modifications to SQLAlchemy’s attribute management │ │ │ │ system. │ │ │ │ Listing of files: │ │ │ │ - * _l_i_s_t_e_n___f_o_r___e_v_e_n_t_s_._p_y - Illustrates how to attach events to all │ │ │ │ - instrumented attributes and listen for change events. │ │ │ │ -_c_u_s_t_o_m___m_a_n_a_g_e_m_e_n_t_._p_y - Illustrates customized class instrumentation, using the │ │ │ │ -_s_q_l_a_l_c_h_e_m_y_._e_x_t_._i_n_s_t_r_u_m_e_n_t_a_t_i_o_n extension package. │ │ │ │ + * _c_u_s_t_o_m___m_a_n_a_g_e_m_e_n_t_._p_y - Illustrates customized class instrumentation, │ │ │ │ + using the _s_q_l_a_l_c_h_e_m_y_._e_x_t_._i_n_s_t_r_u_m_e_n_t_a_t_i_o_n extension package. │ │ │ │ +_l_i_s_t_e_n___f_o_r___e_v_e_n_t_s_._p_y - Illustrates how to attach events to all instrumented │ │ │ │ +attributes and listen for change events. │ │ │ │ _a_c_t_i_v_e___c_o_l_u_m_n___d_e_f_a_u_l_t_s_._p_y - Illustrates use of the _A_t_t_r_i_b_u_t_e_E_v_e_n_t_s_._i_n_i_t___s_c_a_l_a_r │ │ │ │ _(_) event, in conjunction with Core column defaults to provide ORM objects that │ │ │ │ automatically produce the default value when an un-set attribute is accessed. │ │ │ │ ******** HHoorriizzoonnttaall SShhaarrddiinngg_?¶ ******** │ │ │ │ A basic example of using the SQLAlchemy Sharding API. Sharding refers to │ │ │ │ horizontally scaling data across multiple databases. │ │ │ │ The basic components of a “sharded” mapping are: │ │ │ │ @@ -566,35 +567,36 @@ │ │ │ │ attempt to determine a single shard being requested. │ │ │ │ The construction of generic sharding routines is an ambitious approach to the │ │ │ │ issue of organizing instances among multiple databases. For a more plain-spoken │ │ │ │ alternative, the “distinct entity” approach is a simple method of assigning │ │ │ │ objects to different tables (and potentially database nodes) in an explicit way │ │ │ │ - described on the wiki at _E_n_t_i_t_y_N_a_m_e. │ │ │ │ Listing of files: │ │ │ │ - * _s_e_p_a_r_a_t_e___t_a_b_l_e_s_._p_y - Illustrates sharding using a single SQLite database, │ │ │ │ - that will however have multiple tables using a naming convention. │ │ │ │ + * _s_e_p_a_r_a_t_e___d_a_t_a_b_a_s_e_s_._p_y - Illustrates sharding using distinct SQLite │ │ │ │ + databases. │ │ │ │ +_s_e_p_a_r_a_t_e___t_a_b_l_e_s_._p_y - Illustrates sharding using a single SQLite database, that │ │ │ │ +will however have multiple tables using a naming convention. │ │ │ │ _s_e_p_a_r_a_t_e___s_c_h_e_m_a___t_r_a_n_s_l_a_t_e_s_._p_y - Illustrates sharding using a single database │ │ │ │ with multiple schemas, where a different “schema_translates_map” can be used │ │ │ │ for each shard. │ │ │ │ -_s_e_p_a_r_a_t_e___d_a_t_a_b_a_s_e_s_._p_y - Illustrates sharding using distinct SQLite databases. │ │ │ │ _a_s_y_n_c_i_o_._p_y - Illustrates sharding API used with asyncio. │ │ │ │ ********** EExxtteennddiinngg tthhee OORRMM_?¶ ********** │ │ │ │ ******** OORRMM QQuueerryy EEvveennttss_?¶ ******** │ │ │ │ Recipes which illustrate augmentation of ORM SELECT behavior as used by │ │ │ │ _S_e_s_s_i_o_n_._e_x_e_c_u_t_e_(_) with _2_._0_ _s_t_y_l_e use of _s_e_l_e_c_t_(_), as well as the _1_._x_ _s_t_y_l_e │ │ │ │ _Q_u_e_r_y object. │ │ │ │ Examples include demonstrations of the _w_i_t_h___l_o_a_d_e_r___c_r_i_t_e_r_i_a_(_) option as well as │ │ │ │ the _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. │ │ │ │ As of SQLAlchemy 1.4, the _Q_u_e_r_y construct is unified with the _S_e_l_e_c_t construct, │ │ │ │ so that these two objects are mostly the same. │ │ │ │ Listing of files: │ │ │ │ - * _t_e_m_p_o_r_a_l___r_a_n_g_e_._p_y - Illustrates a custom per-query criteria that will be │ │ │ │ - applied to selected entities. │ │ │ │ -_f_i_l_t_e_r___p_u_b_l_i_c_._p_y - Illustrates a global criteria applied to entities of a │ │ │ │ -particular type. │ │ │ │ + * _f_i_l_t_e_r___p_u_b_l_i_c_._p_y - Illustrates a global criteria applied to entities of a │ │ │ │ + particular type. │ │ │ │ +_t_e_m_p_o_r_a_l___r_a_n_g_e_._p_y - Illustrates a custom per-query criteria that will be │ │ │ │ +applied to selected entities. │ │ │ │ ******** DDooggppiillee CCaacchhiinngg_?¶ ******** │ │ │ │ Illustrates how to embed _d_o_g_p_i_l_e_._c_a_c_h_e functionality with ORM queries, allowing │ │ │ │ full cache control as well as the ability to pull “lazy loaded” attributes from │ │ │ │ long term cache. │ │ │ │ In this demo, the following techniques are illustrated: │ │ │ │ * Using the _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_(_) event hook │ │ │ │ * Basic technique of circumventing _S_e_s_s_i_o_n_._e_x_e_c_u_t_e_(_) to pull from a custom