2010-09-24 12:41:48 -04:00
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module Arel
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module Visitors
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class Oracle < Arel::Visitors::ToSql
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2010-09-24 13:24:31 -04:00
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private
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2010-09-24 12:41:48 -04:00
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def visit_Arel_Nodes_SelectStatement o
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2010-09-24 13:24:31 -04:00
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if o.limit && o.orders.empty? && !o.offset
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2010-09-24 12:41:48 -04:00
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o.cores.last.wheres.push Nodes::LessThanOrEqual.new(
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Nodes::SqlLiteral.new('ROWNUM'), o.limit
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)
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o.limit = nil
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2010-09-24 13:09:21 -04:00
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return super
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2010-09-24 12:41:48 -04:00
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end
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2010-09-24 13:09:21 -04:00
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2010-09-24 13:24:31 -04:00
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if o.limit && o.offset
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limit = o.limit.to_i
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offset = o.offset
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o.limit = nil
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o.offset = nil
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sql = super
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return <<-eosql
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SELECT * FROM (
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SELECT raw_sql_.*, rownum raw_rnum_
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FROM (#{sql}) raw_sql_
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WHERE rownum <= #{offset.value.to_i + limit}
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)
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WHERE #{visit offset}
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eosql
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end
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2010-09-24 13:09:21 -04:00
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if o.limit && !o.orders.empty?
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limit = o.limit
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o.limit = nil
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return "SELECT * FROM (#{super}) WHERE ROWNUM <= #{limit}"
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end
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2010-09-24 12:41:48 -04:00
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super
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end
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2010-09-24 13:24:31 -04:00
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def visit_Arel_Nodes_Offset o
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"raw_rnum_ > #{visit o.value}"
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end
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2010-09-24 12:41:48 -04:00
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end
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end
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end
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