Class Join
Used by sql.Query and sql.SQLCompiler to generate JOIN clauses into the FROM entry. For example, the SQL generated could be LEFT OUTER JOIN "sometable" T1 ON ("othertable"."sometable_id" = "sometable"."id")
Declaration
class Join
source linkDocumentation
This class is primarily used in Query.alias_map. All entries in alias_map
must be Join compatible by providing the following attributes and methods:
- table_name (string)
- table_alias (possible alias for the table, can be None)
- join_type (can be None for those entries that aren't joined from
anything)
- parent_alias (which table is this join's parent, can be None similarly
to join_type)
- as_sql()
- relabeled_clone()Methods
▶ def __init__(self, table_name, parent_alias, table_alias, join_type, join_field, nullable, ...) def __init__(
self,
table_name,
parent_alias,
table_alias,
join_type,
join_field,
nullable,
filtered_relation=None,
)
▷ def as_sql(self, compiler, connection) Generate the full LEFT OUTER JOIN sometable ON sometable.somecol = othertable.othercol, params clause for this join.
▷ def equals(self, other, with_filtered_relation) @property
def identity(self)
Reexports