Class: ActiveRecord::ConnectionAdapters::IBM_DB2_ZOS

Inherits:
IBM_DB2 show all
Defined in:
lib/active_record/connection_adapters/ibm_db_adapter.rb

Overview

module HostedDataServer

Direct Known Subclasses

IBM_DB2_ZOS_8

Instance Method Summary collapse

Methods inherited from IBM_DB2

#change_column, #execute, #get_datetime_mapping, #get_double_mapping, #get_time_mapping, #last_generated_id, #primary_key, #query_offset_limit, #select, #select_rows, #set_binary_value, #set_case, #set_text_default

Methods inherited from IBM_DataServer

#check_reserved_words, #execute, #get_datetime_mapping, #get_double_mapping, #get_time_mapping, #initialize, #last_generated_id, #limit_not_supported_types, #query_offset_limit, #reorg_table, #select, #select_rows, #set_binary_value, #set_case, #set_schema, #set_text_default, #setup_for_lob_table

Constructor Details

This class inherits a constructor from ActiveRecord::ConnectionAdapters::IBM_DataServer

Instance Method Details

#change_column_default(table_name, column_name, default) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1961

def change_column_default(table_name, column_name, default)
  unless default
    raise NotImplementedError,
    "DB2 for zOS data server version 9 does not support changing the column default to NULL"
  else
    super
  end
end

#change_column_null(table_name, column_name, null, default) ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1970

def change_column_null(table_name, column_name, null, default)
  raise NotImplementedError,
  "DB2 for zOS data server does not support changing the column's nullability"
end

#create_index_after_table(table_name, column_name) ⇒ Object

since v9 doesn’t need, suggest putting it in HostedDataServer?



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1910

def create_index_after_table(table_name,column_name)
  @adapter.add_index(table_name, column_name, :unique => true) 
end

#remove_column(table_name, column_name) ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1914

def remove_column(table_name, column_name)
  raise NotImplementedError,
  "remove_column is not supported by the DB2 for zOS data server"
end

#rename_column(table_name, column_name, new_column_name) ⇒ Object

Alter table column for renaming a column



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1920

def rename_column(table_name, column_name, new_column_name)
  _table_name      = table_name.to_s
  _column_name     = column_name.to_s
  _new_column_name = new_column_name.to_s

  nil_condition    = _table_name.nil? || _column_name.nil? || _new_column_name.nil?
  empty_condition  = _table_name.empty? || 
                       _column_name.empty? || 
                         _new_column_name.empty? unless nil_condition

  if nil_condition || empty_condition
    raise ArgumentError,"One of the arguments passed to rename_column is empty or nil"
  end

  begin
    rename_column_sql = "ALTER TABLE #{_table_name} RENAME COLUMN #{_column_name} \
             TO #{_new_column_name}"

    unless stmt = execute(rename_column_sql)
      error_msg = IBM_DB.conn_errormsg 
      error_msg = IBM_DB.stmt_errormsg if error_msg.empty?
      if error_msg && !error_msg.empty?
        raise "Rename column failed : #{error_msg}"
      else
        raise StandardError.new('An unexpected error occurred during renaming the column')
      end
    end

    reorg_table(_table_name)

  ensure
    IBM_DB.free_stmt stmt if stmt
  end #End of begin
end

#set_binary_default(value) ⇒ Object

DB2 z/OS only allows NULL or “” (empty) string as DEFAULT value for a BLOB column. For non-empty string and non-NULL values, the server returns error



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1957

def set_binary_default(value)
  "#{value}"
end