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Useful auxiliary data structures for query construction. Not useful outside
the SQL domain.
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Used by join construction code to indicate the point at which a
multi-valued join was attempted (if the caller wants to treat that
exceptionally).
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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")
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()
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Generate the full
LEFT OUTER JOIN sometable ON sometable.somecol = othertable.othercol, params
clause for this join.
z
%s.%s = %s.%sz(%s)�fieldzaJoin generated an empty ON clause. %s did not yield either joining columns or extra restrictions.z AND � � %sz%s %s%s ON (%s))�quote_name_unless_alias�ops�
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z Join.as_sqlc sr � � | j| j�}� � | j| j�}| jd ur'| j�� }� fdd�| jjD �|_nd }| j| j||| j| j | j
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<listcomp>m s z(Join.relabeled_clone.<locals>.<listcomp>)r ) r> r r r �clone�pathr, r r r r )r rB �new_parent_alias�new_table_aliasr r rA r
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�zJoin.relabeled_clonec C s | j | j| j| j| jfS r )r, r r r r �r r r r
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isinstancer �NotImplementedrJ �r �otherr r r
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�equals� s z Join.equalsc C � | � i �}t|_|S r )rH r r �r �newr r r
�demote� �
z Join.demotec C r\ r )rH r r r] r r r
�promote� r` z Join.promoter )r r r r r r= rH �propertyrJ rP rU r[ r_ ra r r r r
r s
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r c @ sX e Zd ZdZdZdZdZdd� Zdd� Zdd� Z e
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dd� ZdS )� BaseTablez�
The BaseTable class is used for base table references in FROM clause. For
example, the SQL "foo" in
SELECT * FROM "foo" WHERE somecond
could be generated by this class.
Nc C r r )r r )r r �aliasr r r
r � s
zBaseTable.__init__c C s2 | j | jkrdnd| j }|�| j�}|| g fS )Nr r )r r r! )r r. r/ r; �base_sqlr r r
r= � s zBaseTable.as_sqlc C s | � | j|�| j| j��S r )r, r r> r )r rB r r r
rH � s zBaseTable.relabeled_clonec C s | j | j| jfS r )r, r r rI r r r
rJ � s zBaseTable.identityc C rK r )rL rc rM rJ rN r r r
rP � rQ zBaseTable.__eq__c C rR r rS rI r r r
rU � rV zBaseTable.__hash__c C s | j |j kS r rX rY r r r
r[ � s zBaseTable.equals)r r r r r r r r r= rH rb rJ rP rU r[ r r r r
rc � s
rc N) r � django.db.models.sql.constantsr r � Exceptionr r r rc r r r r
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