Class: OCI8::Object::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/oci8/object.rb

Constant Summary collapse

@@class_to_name = 
{}
@@name_to_class = 
{}
@@default_connection = 
nil

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Base

Returns a new instance of Base.



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# File 'lib/oci8/object.rb', line 132

def initialize(*args)
  @attributes = {}
  if args[0].is_a? OCI8
    @con = args.shift
  else
    @con = @@default_connection
  end
  return if args.empty?
  raise "no connection is specified." if @con.nil?
  # setup a TDO object.
  tdo = @con.get_tdo_by_class(self.class)
  # call constructor.
  bind_arg_helper = BindArgumentHelper.new(*args)
  sql = <<EOS
BEGIN
  :self := #{tdo.typename}(#{bind_arg_helper.arg_str});
END;
EOS
  csr = @con.parse(sql)
  begin
    csr.bind_param(:self, nil, :named_type_internal, tdo)
    bind_arg_helper.exec(@con, csr)
    @attributes = csr[:self].attributes
  ensure
    csr.close
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_id, *args) ⇒ Object

instance method



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# File 'lib/oci8/object.rb', line 207

def method_missing(method_id, *args)
  if @attributes.is_a? Array
    return @attributes if method_id == :to_ary
    super
  end
  # getter func
  if @attributes.has_key?(method_id)
    if args.length != 0
      raise ArgumentError, "wrong number of arguments (#{args.length} for 0)"
    end
    return @attributes[method_id]
  end
  # setter func
  method_name = method_id.to_s
  if method_name[-1] == ?=
    attr = method_name[0...-1].intern
    if @attributes.has_key?(attr)
      if args.length != 1
        raise ArgumentError, "wrong number of arguments (#{args.length} for 1)"
      end
      return @attributes[attr] = args[0]
    end
  end

  super if @con.nil?

  tdo = @con.get_tdo_by_class(self.class)
  return_type = tdo.instance_methods[method_id]
  if return_type == :none
    # procedure
    bind_arg_helper = BindArgumentHelper.new(*args)
    sql = <<EOS
DECLARE
  val #{tdo.typename} := :self;
BEGIN
  val.#{method_id}(#{bind_arg_helper.arg_str});
  :self := val;
END;
EOS
    csr = @con.parse(sql)
    begin
      csr.bind_param(:self, nil, :named_type_internal, tdo)
      csr[:self].attributes = self
      bind_arg_helper.exec(@con, csr)
      @attributes = csr[:self].attributes
    ensure
      csr.close
    end
    return nil
  elsif return_type
    # function
    bind_arg_helper = BindArgumentHelper.new(*args)
    sql = <<EOS
DECLARE
  val #{tdo.typename} := :self;
BEGIN
  :rv := val.#{method_id}(#{bind_arg_helper.arg_str});
  :self := val;
END;
EOS
    csr = @con.parse(sql)
    begin
      csr.bind_param(:self, nil, :named_type_internal, tdo)
      csr.bind_param(:rv, nil, return_type)
      csr[:self].attributes = self
      bind_arg_helper.exec(@con, csr)
      @attributes = csr[:self].attributes
      rv = csr[:rv]
    ensure
      csr.close
    end
    return rv
  end
  # The method is not found.
  super
end

Class Method Details

.default_connection=(con) ⇒ Object 



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# File 'lib/oci8/object.rb', line 128

def self.default_connection=(con)
  @@default_connection = con
end

.get_class_by_typename(name) ⇒ Object 



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# File 'lib/oci8/object.rb', line 111

def self.get_class_by_typename(name)
  @@name_to_class[name]
end

.inherited(klass) ⇒ Object 



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# File 'lib/oci8/object.rb', line 105

def self.inherited(klass)
  name = klass.to_s.gsub(/^.*::/, '').gsub(/([a-z\d])([A-Z])/,'\1_\2').upcase
  @@class_to_name[klass] = name
  @@name_to_class[name] = klass
end

.method_missing(method_id, *args) ⇒ Object

class method



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# File 'lib/oci8/object.rb', line 161

def self.method_missing(method_id, *args)
  if args[0].is_a? OCI8
    con = args.shift
  else
    con = @@default_connection
  end
  tdo = con.get_tdo_by_class(self)
  return_type = tdo.class_methods[method_id]
  if return_type == :none
    # procedure
    bind_arg_helper = BindArgumentHelper.new(*args)
    sql = <<EOS
BEGIN
  #{tdo.typename}.#{method_id}(#{bind_arg_helper.arg_str});
END;
EOS
    csr = con.parse(sql)
    begin
      bind_arg_helper.exec(con, csr)
    ensure
      csr.close
    end
    return nil
  elsif return_type
    # function
    return_type = tdo.class_methods[method_id]
    bind_arg_helper = BindArgumentHelper.new(*args)
    sql = <<EOS
BEGIN
  :rv := #{tdo.typename}.#{method_id}(#{bind_arg_helper.arg_str});
END;
EOS
    csr = con.parse(sql)
    begin
      csr.bind_param(:rv, nil, return_type)
      bind_arg_helper.exec(con, csr)
      rv = csr[:rv]
    ensure
      csr.close
    end
    return rv
  end
  super # The method is not found.
end

.set_typename(name) ⇒ Object 



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# File 'lib/oci8/object.rb', line 119

def self.set_typename(name)
  # delete an old name-to-class mapping.
  @@name_to_class[@@class_to_name[self]] = nil
  # set a new name-to-class mapping.
  name = name.upcase
  @@class_to_name[self] = name
  @@name_to_class[name] = self
end

.typename ⇒ Object 



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# File 'lib/oci8/object.rb', line 115

def self.typename
  @@class_to_name[self]
end