Module: ArJdbc::Informix

Defined in:
lib/arjdbc/informix/adapter.rb

Defined Under Namespace

Modules: Column

Constant Summary collapse

@@_lob_callback_added = 
nil

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.column_selector ⇒ Object 



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# File 'lib/arjdbc/informix/adapter.rb', line 31

def self.column_selector
  [ /informix/i, lambda { |cfg, column| column.extend(::ArJdbc::Informix::Column) } ]
end

.extended(base) ⇒ Object 



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# File 'lib/arjdbc/informix/adapter.rb', line 8

def self.extended(base)
  unless @@_lob_callback_added
    ActiveRecord::Base.class_eval do
      def after_save_with_informix_lob
        lob_columns = self.class.columns.select { |c| [:text, :binary].include?(c.type) }
        lob_columns.each do |column|
          value = ::ArJdbc::SerializedAttributesHelper.dump_column_value(self, column)
          next if value.nil? || (value == '')
          
          connection.write_large_object(
            column.type == :binary, column.name, 
            self.class.table_name, self.class.primary_key, 
            quote_value(id), value
          )
        end
      end
    end

    ActiveRecord::Base.after_save :after_save_with_informix_lob
    @@_lob_callback_added = true
  end
end

.jdbc_connection_class ⇒ Object 



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# File 'lib/arjdbc/informix/adapter.rb', line 35

def self.jdbc_connection_class
  ::ActiveRecord::ConnectionAdapters::InformixJdbcConnection
end

Instance Method Details

#add_limit_offset!(sql, options) ⇒ Object 



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# File 'lib/arjdbc/informix/adapter.rb', line 81

def add_limit_offset!(sql, options)
  if options[:limit]
    limit = "FIRST #{options[:limit]}" # SKIP available only in IDS >= 10 :
    offset = (db_major_version >= 10 && options[:offset] ? "SKIP #{options[:offset]}" : "")
    sql.sub!(/^\s*?select /i, "SELECT #{offset} #{limit} ")
  end
  sql
end

#create_table(name, options = {}) ⇒ Object 



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# File 'lib/arjdbc/informix/adapter.rb', line 111

def create_table(name, options = {})
  super(name, options)
  execute("CREATE SEQUENCE #{name}_seq")
end

#default_sequence_name(table, column) ⇒ Object 



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# File 'lib/arjdbc/informix/adapter.rb', line 77

def default_sequence_name(table, column)
  "#{table}_seq"
end

#drop_table(name) ⇒ Object 



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# File 'lib/arjdbc/informix/adapter.rb', line 121

def drop_table(name)
  super(name)
  execute("DROP SEQUENCE #{name}_seq")
end

#modify_types(types) ⇒ Object 



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# File 'lib/arjdbc/informix/adapter.rb', line 53

def modify_types(types)
  super(types)
  types[:primary_key] = "SERIAL PRIMARY KEY"
  types[:string]      = { :name => "VARCHAR", :limit => 255 }
  types[:integer]     = { :name => "INTEGER" }
  types[:float]       = { :name => "FLOAT" }
  types[:decimal]     = { :name => "DECIMAL" }
  types[:datetime]    = { :name => "DATETIME YEAR TO FRACTION(5)" }
  types[:timestamp]   = { :name => "DATETIME YEAR TO FRACTION(5)" }
  types[:time]        = { :name => "DATETIME HOUR TO FRACTION(5)" }
  types[:date]        = { :name => "DATE" }
  types[:binary]      = { :name => "BYTE" }
  types[:boolean]     = { :name => "BOOLEAN" }
  types
end

#next_sequence_value(sequence_name) ⇒ Object 



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# File 'lib/arjdbc/informix/adapter.rb', line 90

def next_sequence_value(sequence_name)
  select_one("SELECT #{sequence_name}.nextval id FROM systables WHERE tabid=1")['id']
end

#prefetch_primary_key?(table_name = nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/informix/adapter.rb', line 69

def prefetch_primary_key?(table_name = nil)
  true
end

#quote(value, column = nil) ⇒ Object 



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# File 'lib/arjdbc/informix/adapter.rb', line 99

def quote(value, column = nil)
  column_type = column && column.type
  if column_type == :binary || column_type == :text
    # LOBs are updated separately by an after_save trigger.
    "NULL"
  elsif column_type == :date
    "'#{value.mon}/#{value.day}/#{value.year}'"
  else
    super
  end
end

#quote_string(string) ⇒ Object

TODO: Add some smart quoting for newlines in string and text fields.



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# File 'lib/arjdbc/informix/adapter.rb', line 95

def quote_string(string)
  string.gsub(/\'/, "''")
end

#remove_index(table_name, options = {}) ⇒ Object 



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# File 'lib/arjdbc/informix/adapter.rb', line 126

def remove_index(table_name, options = {})
  @connection.execute_update("DROP INDEX #{index_name(table_name, options)}")
end

#rename_table(name, new_name) ⇒ Object 



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# File 'lib/arjdbc/informix/adapter.rb', line 116

def rename_table(name, new_name)
  execute("RENAME TABLE #{name} TO #{new_name}")
  execute("RENAME SEQUENCE #{name}_seq TO #{new_name}_seq")
end

#select(sql, *rest) ⇒ Object 



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# File 'lib/arjdbc/informix/adapter.rb', line 130

def select(sql, *rest)
  # Informix does not like "= NULL", "!= NULL", or "<> NULL".
  execute(sql.gsub(/(!=|<>)\s*null/i, "IS NOT NULL").gsub(/=\s*null/i, "IS NULL"), *rest)
end

#supports_migrations? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/informix/adapter.rb', line 73

def supports_migrations?
  true
end