Class: Join

Inherits:
Expression show all
Defined in:
lib/eno/expressions.rb

Constant Summary collapse

H_JOIN_TYPES = 
{
  nil:    'join',
  inner:  'inner join',
  outer:  'outer join'
}
S_JOIN = 
'%s %s %s %s'
S_ON = 
'on %s'
S_USING = 
'using (%s)'

Constants inherited from Expression

Expression::S_AND, Expression::S_DIV, Expression::S_EQ, Expression::S_GT, Expression::S_GTE, Expression::S_LT, Expression::S_LTE, Expression::S_MINUS, Expression::S_MOD, Expression::S_MUL, Expression::S_NEQ, Expression::S_OR, Expression::S_PLUS, Expression::S_TILDE

Instance Attribute Summary

Attributes inherited from Expression

#members, #props

Instance Method Summary collapse

Methods inherited from Expression

#!=, #!@, #%, #&, #*, #+, #-, #/, #<, #<=, #==, #=~, #>, #>=, #^, #as, #cast, #desc, #in, #initialize, #inner_join, #join, #not_in, #not_null?, #null?, #over, #|

Constructor Details

This class inherits a constructor from Expression

Instance Method Details

#condition_sql(sql) ⇒ Object 



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# File 'lib/eno/expressions.rb', line 315

def condition_sql(sql)
  if @props[:on]
    S_ON % sql.quote(@props[:on])
  elsif using_fields = @props[:using]
    fields = using_fields.is_a?(Array) ? using_fields : [using_fields]
    S_USING % fields.map { |f| sql.quote(f) }.join(S_COMMA)
  else
    nil
  end
end

#to_sql(sql) ⇒ Object 



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# File 'lib/eno/expressions.rb', line 306

def to_sql(sql)
  (S_JOIN % [
    sql.quote(@members[0]),
    H_JOIN_TYPES[@props[:type]],
    sql.quote(@members[1]),
    condition_sql(sql)
  ]).strip
end