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, #extract_new_default_value, #get_datetime_mapping, #get_double_mapping, #get_time_mapping, #initialize, #last_generated_id, #primary_key_definition, #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, #prepare, #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_DB2

Instance Method Details

#change_column_default(table_name, column_name, default) ⇒ Object 



3414
3415
3416
3417
3418
3419
3420
3421
 
# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3414

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) 


3423
3424
3425
3426
 
# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3423

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?



3364
3365
3366
 
# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3364

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) 


3368
3369
3370
3371
 
# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3368

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



3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
 
# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3374

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.getErrormsg(@adapter.connection, IBM_DB::DB_CONN )
      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



3410
3411
3412
 
# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3410

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