Class: Arel::Visitors::Oracle

Inherits:
Object
  • Object
show all
Defined in:
lib/arel_extensions/visitors/oracle.rb

Constant Summary collapse

SPECIAL_CHARS = 
{"\t" => 'CHR(9)', "\n" => 'CHR(10)', "\r" => 'CHR(13)'}
DATE_MAPPING = 
{'d' => 'DAY', 'm' => 'MONTH', 'w' => 'IW', 'y' => 'YEAR', 'wd' => 'D', 'h' => 'HOUR', 'mn' => 'MINUTE', 's' => 'SECOND'}
DATE_FORMAT_DIRECTIVES = 
{
  '%Y' => 'YYYY', '%C' => 'CC', '%y' => 'YY', '%m' => 'MM', '%B' => 'Month', '%^B' => 'MONTH', '%b' => 'Mon', '%^b' => 'MON',
  '%d' => 'DD', '%e' => 'FMDD', '%j' => 'DDD', '%w' => '', '%A' => 'Day',                             # day, weekday
  '%H' => 'HH24', '%k' => '', '%I' => 'HH', '%l' => '', '%P' => 'am', '%p' => 'AM',                   # hours
  '%M' => 'MI', '%S' => 'SS', '%L' => 'MS', '%N' => 'US', '%z' => 'tz'                                # seconds, subseconds
}
NUMBER_COMMA_MAPPING =

seconds, subseconds

{ 'en_US' => '.,', 'fr_FR' => ',', 'sv_SE' => ', ' }

Instance Method Summary collapse

Instance Method Details

#get_time_converted(element) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 516

def get_time_converted element
  if element.is_a?(Time)
    ArelExtensions::Nodes::Format.new [element, '%H:%M:%S']
  elsif element.is_a?(Arel::Attributes::Attribute)
    col = Arel::Table.engine.connection.schema_cache.columns_hash(element.relation.table_name)[element.name.to_s]
    if col && (col.type == :time)
      ArelExtensions::Nodes::Format.new [element, '%H:%M:%S']
    else
      element
    end
  else
    element
  end
end

#visit_Arel_Attributes_Attribute(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 603

def visit_Arel_Attributes_Attribute o, collector
  join_name = o.relation.table_alias || o.relation.name
  if join_name.length > 30
    join_name = Arel.shorten(join_name)
  end
  collector << "#{quote_table_name join_name}.#{quote_column_name o.name}"
end

#visit_Arel_Nodes_As(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 583

def visit_Arel_Nodes_As o, collector
  if o.left.is_a?(Arel::Nodes::Binary)
    collector << '('
    collector = visit o.left, collector
    collector << ')'
  else
    collector = visit o.left, collector
  end
  quote = o.right.to_s =~ /(\A["].*["]\z)|\A[a-zA-Z_]*\z/ ? '' : '"'
  collector << " AS #{quote}"
  collector = visit o.right, collector
  collector << "#{quote}"
  collector
end

#visit_Arel_Nodes_GreaterThan(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 541

def visit_Arel_Nodes_GreaterThan o, collector
  collector = visit get_time_converted(o.left), collector
  collector << " > "
  collector = visit get_time_converted(o.right), collector
  collector
end

#visit_Arel_Nodes_GreaterThanOrEqual(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 533

def visit_Arel_Nodes_GreaterThanOrEqual o, collector
  collector = visit get_time_converted(o.left), collector
  collector << " >= "
  collector = visit get_time_converted(o.right), collector
  collector
end

#visit_Arel_Nodes_LessThan(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 557

def visit_Arel_Nodes_LessThan o, collector
  collector = visit get_time_converted(o.left), collector
  collector << " < "
  collector = visit get_time_converted(o.right), collector
  collector
end

#visit_Arel_Nodes_LessThanOrEqual(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 549

def visit_Arel_Nodes_LessThanOrEqual o, collector
  collector = visit get_time_converted(o.left), collector
  collector << " <= "
  collector = visit get_time_converted(o.right), collector
  collector
end

#visit_Arel_Nodes_NotRegexp(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 349

def visit_Arel_Nodes_NotRegexp o, collector
  collector << " NOT REGEXP_LIKE("
  collector = visit o.left, collector
  collector << COMMA
  collector = visit o.right, collector
  collector << ')'
  collector
end

#visit_Arel_Nodes_Regexp(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 340

def visit_Arel_Nodes_Regexp o, collector
  collector << " REGEXP_LIKE("
  collector = visit o.left, collector
  collector << COMMA
  collector = visit o.right, collector
  collector << ')'
  collector
end

#visit_Arel_Nodes_SelectStatement(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 566

def visit_Arel_Nodes_SelectStatement o, collector
  if !(collector.value.blank? || (collector.value.is_a?(Array) && collector.value[0].blank?)) && o.limit.blank? && o.offset.blank?
    o = o.dup
    o.orders = []
  end
  old_visit_Arel_Nodes_SelectStatement(o,collector)
end

#visit_Arel_Nodes_TableAlias(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 575

def visit_Arel_Nodes_TableAlias o, collector
  if o.name.length > 30
    o = Arel::Table.new(o.table_name).alias(Base64.urlsafe_encode64(Digest::MD5.new.digest(o.name)).tr('=', '').tr('-', '_'))
  end
  old_visit_Arel_Nodes_TableAlias(o,collector)
end

#visit_ArelExtensions_InsertManager_BulkValues(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 470

def visit_ArelExtensions_InsertManager_BulkValues o, collector
  collector << "("
  o.left.each_with_index do |row, idx| # values
  collector << " UNION ALL " if idx != 0
  collector << "(SELECT "
  len = row.length - 1
  row.zip(o.cols).each_with_index { |(value, attr), i|
      case value
      when Arel::Nodes::SqlLiteral, Arel::Nodes::BindParam
        collector = visit value, collector
      else
        collector << quote(value, attr && column_for(attr)).to_s
      end
      collector << COMMA unless i == len
  }
  collector << ' FROM DUAL)'
  end
  collector << ")"
  collector
end

#visit_ArelExtensions_Nodes_AiIMatches(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 71

def visit_ArelExtensions_Nodes_AiIMatches o, collector
  collector = visit o.left.ai_collate, collector
  collector << ' LIKE '
  collector = visit o.right.ai_collate, collector
  if o.escape
    collector << ' ESCAPE '
    visit o.escape, collector
  else
    collector
  end
end

#visit_ArelExtensions_Nodes_AiMatches(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 59

def visit_ArelExtensions_Nodes_AiMatches o, collector
  collector = visit o.left.ai_collate, collector
  collector << ' LIKE '
  collector = visit o.right.ai_collate, collector
  if o.escape
    collector << ' ESCAPE '
    visit o.escape, collector
  else
    collector
  end
end

#visit_ArelExtensions_Nodes_As(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 598

def visit_ArelExtensions_Nodes_As o, collector
  visit_Arel_Nodes_As o, collector
end

#visit_ArelExtensions_Nodes_Blank(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 430

def visit_ArelExtensions_Nodes_Blank o, collector
  visit o.expr.trim.length.coalesce(0).eq(0), collector
end

#visit_ArelExtensions_Nodes_Cast(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 251

def visit_ArelExtensions_Nodes_Cast o, collector
  case o.as_attr
  when :string
    collector << "TO_CHAR("
    collector = visit o.left, collector
    collector << ")"
    return collector
  when :text
    collector << "TO_CLOB("
    collector = visit o.left, collector
    collector << ")"
    return collector
  when :ntext
    collector << "TO_NCLOB("
    collector = visit o.left, collector
    collector << ")"
    return collector
  when :time
    if (o.left.respond_to?(:return_type) && o.left.return_type == :string) || o.left.is_a?(Arel::Nodes::Quoted)
      collector << "TO_DATE("
      collector = visit o.left, collector
      collector << ",'HH24:MI:SS')"
    else
      collector << "TO_DATE(TO_CHAR("
      collector = visit o.left, collector
      collector << ",'HH24:MI:SS'),'HH24:MI:SS')"
    end
    return collector
  when :number, :decimal
    collector << "TO_NUMBER("
    collector = visit o.left, collector
    collector << ")"
    return collector
  when :datetime
    as_attr = Arel::Nodes::SqlLiteral.new('timestamp')
  when :date
    if (o.left.respond_to?(:return_type) && o.left.return_type == :string) || o.left.is_a?(Arel::Nodes::Quoted)
      collector << "TO_DATE("
      collector = visit o.left, collector
      collector << ",'YYYY-MM-DD')"
    else
      collector << "TO_DATE(TO_CHAR("
      collector = visit o.left, collector
      collector << ",'YYYY-MM-DD'),'YYYY-MM-DD')"
    end
    return collector
  when :binary
    as_attr = Arel::Nodes::SqlLiteral.new('binary')
  else
    as_attr = Arel::Nodes::SqlLiteral.new(o.as_attr.to_s)
  end
  collector << "CAST("
  collector = visit o.left, collector
  collector << " AS "
  collector = visit as_attr, collector
  collector << ")"
  collector
end

#visit_ArelExtensions_Nodes_Coalesce(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 151

def visit_ArelExtensions_Nodes_Coalesce o, collector
  collector << "COALESCE("
  o.expressions.each_with_index { |arg, i|
    collector << COMMA if i != 0
    if i > 0 && o.left_node_type == :text
      if arg == '' || (arg.is_a?(Arel::Nodes::Quoted) && (arg.expr == ''))
        collector << "NULL"
      else
        collector << 'TO_CLOB('
        collector = visit arg, collector
        collector << ')'
      end
    else
      collector = visit arg, collector
    end
  }
  collector << ")"
  collector
end

#visit_ArelExtensions_Nodes_Collate(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 109

def visit_ArelExtensions_Nodes_Collate o, collector
if o.ai
  collector << "NLSSORT("
  collector = visit o.expressions.first, collector
  collector << COMMA
  collector << "'NLS_SORT = BINARY_AI NLS_COMP = LINGUISTIC'"
  collector << ")"
elsif o.ci
  collector << "NLSSORT("
  collector = visit o.expressions.first, collector
  collector << COMMA
  collector << "'NLS_SORT = BINARY_CI NLS_COMP = LINGUISTIC'"
  collector << ")"
else
  collector = visit o.expressions.first, collector
end
collector
end

#visit_ArelExtensions_Nodes_Concat(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 35

def visit_ArelExtensions_Nodes_Concat o, collector
  collector << '('
  o.expressions.each_with_index { |arg, i|
    collector = visit o.convert_to_string_node(arg), collector
    collector << ' || ' unless i == o.expressions.length - 1
  }
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_DateAdd(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 438

def visit_ArelExtensions_Nodes_DateAdd o, collector
  collector << '('
  collector = visit o.left, collector
  collector << ' + ' # (o.right.value >= 0 ? ' + ' : ' - ')
  collector = visit o.oracle_value(o.right), collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_DateDiff(o, collector) ⇒ Object

:date is not possible in Oracle since this type does not really exist



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# File 'lib/arel_extensions/visitors/oracle.rb', line 179

def visit_ArelExtensions_Nodes_DateDiff o, collector
  lc = o.left_node_type == :ruby_date || o.left_node_type == :ruby_time
  rc = o.right_node_type == :ruby_date || o.right_node_type == :ruby_time
  if rc || o.right_node_type == :date || o.right_node_type == :datetime || o.right_node_type == :time
    collector << '('
    collector << 'TO_DATE(' if lc
    collector = visit o.left, collector
    collector << ')' if lc
    collector << " - "
    collector << 'TO_DATE(' if rc
    collector = visit o.right, collector
    collector << ')' if rc
    collector << ')'
    if (o.left_node_type == :ruby_time || o.left_node_type == :datetime || o.left_node_type == :time)
      collector << ' * (CASE WHEN (TRUNC('
      collector << 'TO_DATE(' if lc
      collector = visit o.left, collector
      collector << ')' if lc
      collector << COMMA
      collector << "'DDD') = "
      collector << 'TO_DATE(' if lc
      collector = visit o.left, collector
      collector << ')' if lc
      collector << ') THEN 1 ELSE 86400 END)' # converts to seconds
    end
  else
    collector << '('
    collector = visit o.left, collector
    collector << ' - ('
    if o.right.is_a?(ArelExtensions::Nodes::Duration)
      o.right.with_interval = true
    end
    collector = visit o.right, collector
    collector << '))'
    collector
  end
  collector
end

#visit_ArelExtensions_Nodes_Duration(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 218

def visit_ArelExtensions_Nodes_Duration o, collector
  case o.left
  when 'wd', 'w'
    collector << "TO_CHAR("
    collector = visit o.right, collector
    collector << COMMA
    collector = visit Arel::Nodes.build_quoted(DATE_MAPPING[o.left]), collector
  else
    right = case o.left
    when  'd','m','y'
      interval = 'DAY'
      o.right.cast(:date)
    when 'h','mn','s'
      interval = 'SECOND'
      o.right.cast(:datetime)
    when /i\z/
      interval = DATE_MAPPING[o.left[0..-2]]
      collector << '('
      collector = visit o.right, collector
      collector << ") * (INTERVAL '1' #{interval})"
      return collector
    else
      interval = nil
      o.right
    end
    collector << "EXTRACT(#{DATE_MAPPING[o.left]} FROM "
    collector = visit right, collector
  end
  collector << ")"
  collector << " * (INTERVAL '1' #{interval})" if interval && o.with_interval
  collector
end

#visit_ArelExtensions_Nodes_Format(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 447

def visit_ArelExtensions_Nodes_Format o, collector
  fmt = ArelExtensions::Visitors::strftime_to_format(o.iso_format, DATE_FORMAT_DIRECTIVES)
  collector << "TO_CHAR("
  collector = visit o.left, collector
  collector << COMMA
  collector = visit Arel::Nodes.build_quoted(fmt), collector
  collector << ")"
  collector
end

#visit_ArelExtensions_Nodes_FormattedNumber(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 611

def visit_ArelExtensions_Nodes_FormattedNumber o, collector
  col = o.left.coalesce(0)
  comma = NUMBER_COMMA_MAPPING[o.locale] || '.,'
  comma_in_format = o.precision == 0 ? '' : 'D'
  nines_after = (1..o.precision-1).map{'9'}.join('')+'0'
  if comma.length == 1
    options = Arel::Nodes.build_quoted("NLS_NUMERIC_CHARACTERS = '"+comma+" '")
    nines_before = ("999"*4+"990")
  else
    options = Arel::Nodes.build_quoted("NLS_NUMERIC_CHARACTERS = '"+comma+"'")
    nines_before = ("999G"*4+"990")
  end
  sign = ArelExtensions::Nodes::Case.new.when(col<0).
            then('-').
            else(o.flags.include?('+') ? '+' : (o.flags.include?(' ') ? ' ' : ''))
  sign_length = o.flags.include?('+') || o.flags.include?(' ') ?
          Arel::Nodes.build_quoted(1) :
          ArelExtensions::Nodes::Case.new.when(col<0).then(1).else(0)

  if o.scientific_notation
    number = Arel::Nodes::NamedFunction.new('TO_CHAR',[
          Arel::Nodes.build_quoted(col.abs),
          Arel::Nodes.build_quoted('FM'+nines_before+comma_in_format+nines_after+'EEEE'),
          options
        ])
    if o.type == 'e'
      number = number.replace('E','e')
    end
  else
    number = Arel::Nodes::NamedFunction.new('TO_CHAR',[
          Arel::Nodes.build_quoted(col.abs),
          Arel::Nodes.build_quoted('FM'+nines_before+comma_in_format+nines_after),
          options
        ])
  end

  repeated_char = (o.width == 0) ? Arel::Nodes.build_quoted('') : ArelExtensions::Nodes::Case.new().
    when(Arel::Nodes.build_quoted(o.width).abs-(number.length+sign_length)>0).
    then(Arel::Nodes.build_quoted(
        o.flags.include?('-') ? ' ' : (o.flags.include?('0') ? '0' : ' ')
      ).repeat(Arel::Nodes.build_quoted(o.width).abs-(number.length+sign_length))
    ).
    else('')
  before = (!o.flags.include?('0'))&&(!o.flags.include?('-')) ? repeated_char : ''
  middle = (o.flags.include?('0'))&&(!o.flags.include?('-'))  ? repeated_char : ''
  after  = o.flags.include?('-') ? repeated_char : ''
  full_number = ArelExtensions::Nodes::Concat.new([
      before,
      sign,
      middle,
      number,
      after
    ])
  collector = visit ArelExtensions::Nodes::Concat.new([Arel::Nodes.build_quoted(o.prefix),full_number,Arel::Nodes.build_quoted(o.suffix)]), collector
  collector
end

#visit_ArelExtensions_Nodes_GroupConcat(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 128

def visit_ArelExtensions_Nodes_GroupConcat o, collector
  collector << "(LISTAGG("
  collector = visit o.left, collector
  collector << COMMA
  collector =
    if o.separator && o.separator != 'NULL'
      visit o.separator, collector
    else
      visit Arel::Nodes.build_quoted(','), collector
    end
  collector << ") WITHIN GROUP (ORDER BY "
  if !o.order.blank?
    o.order.each_with_index do |order,i|
      collector << COMMA if i != 0
      collector = visit order, collector
    end
  else
    collector = visit o.left, collector
  end
  collector << "))"
  collector
end

#visit_ArelExtensions_Nodes_IDoesNotMatch(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 95

def visit_ArelExtensions_Nodes_IDoesNotMatch o, collector
  collector << 'LOWER('
  collector = visit o.left, collector
  collector << ') NOT LIKE LOWER('
  collector = visit o.right, collector
  collector << ')'
  if o.escape
    collector << ' ESCAPE '
    visit o.escape, collector
  else
    collector
  end
end

#visit_ArelExtensions_Nodes_IMatches(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 45

def visit_ArelExtensions_Nodes_IMatches o, collector
  collector << 'LOWER('
  collector = visit o.left, collector
  collector << ') LIKE LOWER('
  collector = visit o.right, collector
  collector << ')'
  if o.escape
    collector << ' ESCAPE '
    visit o.escape, collector
  else
    collector
  end
end

#visit_ArelExtensions_Nodes_IsNotNull(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 323

def visit_ArelExtensions_Nodes_IsNotNull o, collector
  collector = visit o.expr, collector
  collector << ' IS NOT NULL'
  collector
end

#visit_ArelExtensions_Nodes_IsNull(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 317

def visit_ArelExtensions_Nodes_IsNull o, collector
  collector = visit o.expr, collector
  collector << ' IS NULL'
  collector
end

#visit_ArelExtensions_Nodes_Length(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 310

def visit_ArelExtensions_Nodes_Length o, collector
  collector << "LENGTH("
  collector = visit o.expr, collector
  collector << ")"
  collector
end

#visit_ArelExtensions_Nodes_LevenshteinDistance(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 682

def visit_ArelExtensions_Nodes_LevenshteinDistance o, collector
  collector << "UTL_MATCH.edit_distance("
  collector = visit o.left, collector
  collector << Arel::Visitors::ToSql::COMMA
  collector = visit o.right, collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Locate(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 358

def visit_ArelExtensions_Nodes_Locate o, collector
  collector << "INSTR("
  o.expressions.each_with_index { |arg, i|
    collector << COMMA if i != 0
    collector = visit arg, collector
  }
  collector << ")"
  collector
end

#visit_ArelExtensions_Nodes_Log10(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 15

def visit_ArelExtensions_Nodes_Log10 o, collector
    collector << "LOG("
    o.expressions.each_with_index { |arg, i|
      collector << Arel::Visitors::ToSql::COMMA if i != 0
      collector = visit arg, collector
    }
    collector << ",10)"
    collector
end

#visit_ArelExtensions_Nodes_Ltrim(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 404

def visit_ArelExtensions_Nodes_Ltrim o, collector
  collector << 'TRIM(LEADING '
  if o.right.expr && SPECIAL_CHARS[o.right.expr]
    collector << SPECIAL_CHARS[o.right.expr]
  else
    collector = visit o.right, collector
  end
  collector << ' FROM '
  collector = visit o.left, collector
  collector << ")"
  collector
end

#visit_ArelExtensions_Nodes_MD5(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 171

def visit_ArelExtensions_Nodes_MD5 o, collector
  collector << "LOWER (RAWTOHEX (DBMS_OBFUSCATION_TOOLKIT.md5(input => UTL_I18N.STRING_TO_RAW("
  collector = visit o.left, collector
  collector << ", 'AL32UTF8'))))"
  collector
end

#visit_ArelExtensions_Nodes_NotBlank(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 434

def visit_ArelExtensions_Nodes_NotBlank o, collector
  visit o.expr.trim.length.coalesce(0).gt(0), collector
end

#visit_ArelExtensions_Nodes_Power(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 25

def visit_ArelExtensions_Nodes_Power o, collector
      collector << "POWER("
      o.expressions.each_with_index { |arg, i|
        collector << Arel::Visitors::ToSql::COMMA if i != 0
        collector = visit arg, collector
      }
      collector << ")"
      collector
end

#visit_ArelExtensions_Nodes_Rand(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 329

def visit_ArelExtensions_Nodes_Rand o, collector
  collector << "DBMS_RANDOM.VALUE("
  if o.left && o.right
    collector = visit o.left, collector
    collector << COMMA
    collector = visit o.right, collector
  end
  collector << ")"
  collector
end

#visit_ArelExtensions_Nodes_Repeat(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 457

def visit_ArelExtensions_Nodes_Repeat o, collector
  collector << "LPAD("
  collector = visit o.expressions[0], collector # can't put empty string, otherwise it wouldn't work
  collector << Arel::Visitors::ToSql::COMMA
  collector = visit o.expressions[1], collector
  collector << Arel::Visitors::ToSql::COMMA
  collector = visit o.expressions[0], collector
  collector << ")"
  collector
end

#visit_ArelExtensions_Nodes_Rtrim(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 417

def visit_ArelExtensions_Nodes_Rtrim o, collector
  collector << 'TRIM(TRAILING '
  if o.right.expr && SPECIAL_CHARS[o.right.expr]
    collector << SPECIAL_CHARS[o.right.expr]
  else
    collector = visit o.right, collector
  end
  collector << ' FROM '
  collector = visit o.left, collector
  collector << ")"
  collector
end

#visit_ArelExtensions_Nodes_SMatches(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 83

def visit_ArelExtensions_Nodes_SMatches o, collector
  collector = visit o.left, collector
  collector << ' LIKE '
  collector = visit o.right, collector
  if o.escape
    collector << ' ESCAPE '
    visit o.escape, collector
  else
    collector
  end
end

#visit_ArelExtensions_Nodes_Std(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 668

def visit_ArelExtensions_Nodes_Std o, collector
  collector << (o.unbiased_estimator ? "STDDEV_SAMP(" : "STDDEV_POP(")
  visit o.left, collector
  collector << ")"
  collector
end

#visit_ArelExtensions_Nodes_Substring(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 368

def visit_ArelExtensions_Nodes_Substring o, collector
  collector << "SUBSTR("
  o.expressions.each_with_index { |arg, i|
    collector << COMMA if i != 0
    collector = visit arg, collector
  }
  collector << ")"
  collector
end

#visit_ArelExtensions_Nodes_Trim(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 378

def visit_ArelExtensions_Nodes_Trim o, collector
  collector << 'TRIM(' # BOTH
  if o.right.expr && SPECIAL_CHARS[o.right.expr]
    collector << SPECIAL_CHARS[o.right.expr]
  else
    collector = visit o.right, collector
  end
  collector << ' FROM '
  collector << '(' if o.left.is_a? ArelExtensions::Nodes::Trim
  if o.type_of_attribute(o.left) == :text
    collector << 'dbms_lob.SUBSTR('
    collector = visit o.left, collector
    collector << COMMA
    collector << 'COALESCE(dbms_lob.GETLENGTH('
    collector = visit o.left, collector
    collector << "), 0)"
    collector << COMMA
    collector << '1)'
  else
    collector = visit o.left, collector
  end
  collector << ')' if o.left.is_a? ArelExtensions::Nodes::Trim
  collector << ")"
  collector
end

#visit_ArelExtensions_Nodes_Variance(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/oracle.rb', line 675

def visit_ArelExtensions_Nodes_Variance o, collector
  collector << (o.unbiased_estimator ? "VAR_SAMP(" : "VAR_POP(")
  visit o.left, collector
  collector << ")"
  collector
end