2010-08-24 20:59:03 -04:00
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module Arel
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module Visitors
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###
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# This class produces SQL for JOIN clauses but omits the "single-source"
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# part of the Join grammar:
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#
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# http://www.sqlite.org/syntaxdiagrams.html#join-source
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#
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# This visitor is used in SelectManager#join_sql and is for backwards
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# compatibility with Arel V1.0
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class JoinSql < Arel::Visitors::ToSql
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2010-10-19 14:47:00 -04:00
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private
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2010-08-24 21:13:01 -04:00
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def visit_Arel_Nodes_SelectCore o
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2010-09-20 17:27:34 -04:00
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[o.froms].grep(Nodes::Join).map { |x| visit x }.join ', '
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2010-08-24 21:13:01 -04:00
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end
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2010-09-12 18:45:59 -04:00
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def visit_Arel_Nodes_StringJoin o
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2010-09-12 19:35:13 -04:00
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[
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(visit o.left if Nodes::Join === o.left),
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visit(o.right)
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2010-09-15 13:50:20 -04:00
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].compact.join ' '
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2010-09-12 18:45:59 -04:00
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end
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2010-08-24 20:59:03 -04:00
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def visit_Arel_Nodes_OuterJoin o
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2010-09-15 13:50:20 -04:00
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[
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(visit o.left if Nodes::Join === o.left),
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"LEFT OUTER JOIN #{visit o.right} #{visit o.constraint if o.constraint}"
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].compact.join ' '
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2010-08-24 20:59:03 -04:00
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end
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def visit_Arel_Nodes_InnerJoin o
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2010-09-15 13:50:20 -04:00
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[
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(visit o.left if Nodes::Join === o.left),
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"INNER JOIN #{visit o.right} #{visit o.constraint if o.constraint}"
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].compact.join ' '
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2010-08-24 20:59:03 -04:00
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end
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end
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end
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end
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