o uvXj-@s^dZddlmZddlmZmZGdddeZGdddZGdd d Z Gd d d Z d S) z] Useful auxiliary data structures for query construction. Not useful outside the SQL domain. )EmptyResultSet)INNERLOUTERc@seZdZdZddZdS) MultiJoinz 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). cC||_||_dSN)levelnames_with_path)self names_pospath_with_namesr `/var/www/html/myproject/venv/lib/python3.10/site-packages/django/db/models/sql/datastructures.py__init__s zMultiJoin.__init__N)__name__ __module__ __qualname____doc__rr r r rr s rc@s eZdZdS)EmptyN)rrrr r r rrsrc@sLeZdZdZ dddZddZddZd d Zd d Zd dZ ddZ dS)Joina 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() NcCs8||_||_||_||_||_||_||_||_dSr) table_name parent_alias table_alias join_typeget_joining_columns join_cols join_fieldnullablefiltered_relation)r rrrrrrrr r rr+s  z Join.__init__c Cs*g}g}|j}|jj}|jD]\}}|d||j||||j||fq|j|j j |j|j} | rI| | \} } |d| | | |j rb| |j \} } | rb|d| | | |sst|jd|j} td| jd|} |j|jkrdnd|j}d|j||j|| f}||fS) z 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_aliasops quote_namerappendrrrget_extra_restrictionquery where_classcompileextendrgetattr ValueError __class__joinrr)r compiler connectionjoin_conditionsparamsqnqn2lhs_colrhs_col extra_cond extra_sql extra_paramsdeclared_field on_clause_sql alias_strsqlr r ras_sql=sD     z Join.as_sqlc sr|j|j}|j|j}|jdur'|j}fdd|jjD|_nd}|j|j|||j|j |j |dS)Ncsg|]}||qSr )get).0p change_mapr r osz(Join.relabeled_clone..)r) r?rrrclonepathr-rrrr)r rCnew_parent_aliasnew_table_aliasrr rBrrelabeled_clonejs    zJoin.relabeled_clonecCsBt||jo |j|jko |j|jko |j|jko | p |j|jkSr) isinstancer-rrrrr otherwith_filtered_relationr r requalsws    z Join.equalscCs|j|ddS)NT)rM)rN)r rLr r r__eq__sz Join.__eq__cC|i}t|_|Sr)rIrrr newr r rdemote z Join.demotecCrPr)rIrrrQr r rpromoterTz Join.promoter) rrrrrr>rIrNrOrSrUr r r rrs -   rc@s<eZdZdZdZdZdZddZddZddZ d d Z dS) 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. NcCrr)rr)r raliasr r rrs zBaseTable.__init__cCs2|j|jkrdnd|j}||j}||gfS)Nr r!)rrr")r r/r0r<base_sqlr r rr>s  zBaseTable.as_sqlcCs||j||j|jSr)r-rr?r)r rCr r rrIszBaseTable.relabeled_clonecCs$t||jo|j|jko|j|jkSr)rJr-rrrKr r rrNs   zBaseTable.equals) rrrrrrrrr>rIrNr r r rrVs rVN) rdjango.core.exceptionsrdjango.db.models.sql.constantsrr ExceptionrrrrVr r r rs  t