Class: ActiveRecord::ConnectionAdapters::IBM_DB2_I5

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

Overview

class IBM_DB2_ZOS_8

Constant Summary collapse

TIME_SEP_CHAR = 
{
  "#{IBM_DB::SQL_SEP_COLON}" => ':',
  "#{IBM_DB::SQL_SEP_PERIOD}" => '.',
  "#{IBM_DB::SQL_SEP_COMMA}" => ',',
  "#{IBM_DB::SQL_SEP_BLANK}" => ' ',
  "#{IBM_DB::SQL_SEP_JOB}" => ':' # TODO get separator for job, although Rails is the job
}
@@open_classing_done =

T032: add column with name of id to table with no index fails this strategy is an attempt to keep PowerRuby’s open classing to IBM_DB2_I5

false

Constants included from HostedDataServer

HostedDataServer::RESERVED_WORDS

Class Attribute Summary collapse

Instance Method Summary collapse

Methods included from HostedDataServer

#check_reserved_words

Methods inherited from IBM_DB2

#get_datetime_mapping, #get_double_mapping, #get_time_mapping, #last_generated_id, #primary_key_definition, #query_offset_limit, #query_offset_limit!, #rename_column, #set_binary_default, #set_binary_value, #set_case, #set_text_default

Methods inherited from IBM_DataServer

#check_reserved_words, #create_index_after_table, #execute, #get_datetime_mapping, #get_double_mapping, #get_time_mapping, #last_generated_id, #limit_not_supported_types, #prepare, #query_offset_limit, #query_offset_limit!, #reorg_table, #select, #select_rows, #set_binary_default, #set_binary_value, #set_case, #set_schema, #set_text_default, #setup_for_lob_table

Constructor Details

#initialize(adapter, ar3) ⇒ IBM_DB2_I5

Returns a new instance of IBM_DB2_I5.

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3198

def initialize(adapter, ar3)
  super(adapter, ar3)
  return if self.class.open_classing_done

  # Rails 4 added SchemaCreation
  if defined? ActiveRecord::ConnectionAdapters::AbstractAdapter::SchemaCreation
    ActiveRecord::ConnectionAdapters::AbstractAdapter::SchemaCreation.class_eval do
      def visit_AddColumn(o)
        sql_type = type_to_sql(o.type.to_sym, o.limit, o.precision, o.scale)
        sql = "ADD COLUMN #{quote_column_name(o.name)} #{sql_type}"
        add_column_options!(sql, column_options(o))
      end
    end
  end
  self.class.open_classing_done = true
end

Class Attribute Details

.open_classing_done ⇒ Object

Returns the value of attribute open_classing_done.


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3196

def open_classing_done
  @open_classing_done
end

Instance Method Details

#change_column(table_name, column_name, type, options = {}) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3362

def change_column(table_name, column_name, type, options = {})
  data_type = @adapter.type_to_sql(type, options[:limit], options[:precision], options[:scale])
  sql = "ALTER TABLE #{table_name} ALTER COLUMN #{column_name} SET DATA TYPE #{data_type}"
  execute_and_auto_confirm(sql)
  reorg_table(table_name)

  if options.include?(:default) and options.include?(:null)
    # which to run first?
    if options[:null] or options[:default].nil?
      change_column_null(table_name, column_name, type, options[:null])
      change_column_default(table_name, column_name, options[:default])
    else
      change_column_default(table_name, column_name, options[:default])
      change_column_null(table_name, column_name, type, options[:null])
    end
  elsif options.include?(:default)
    change_column_default(table_name, column_name, options[:default])
  elsif options.include?(:null)
    change_column_null(table_name, column_name, type, options[:null])
  end
end

#change_column_default(table_name, column_name, default) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3353

def change_column_default(table_name, column_name, default)
  if default.nil?
    execute_and_auto_confirm "ALTER TABLE #{table_name} ALTER COLUMN #{column_name} DROP DEFAULT"
  else
    execute_and_auto_confirm "ALTER TABLE #{table_name} ALTER COLUMN #{column_name} SET WITH DEFAULT #{@adapter.quote(default)}"
  end
  reorg_table(table_name)
end

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

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3334

def change_column_null(table_name, column_name, null, default)
  if null && !default.nil?
    change_column_default(table_name, column_name, default)
  end 

  if !null.nil?
    if null
      change_column_sql = "ALTER TABLE #{table_name} ALTER #{column_name} DROP NOT NULL"
    else
      change_column_sql = "ALTER TABLE #{table_name} ALTER #{column_name} SET NOT NULL with DEFAULT #{default}"
    end
    stmt = execute_and_auto_confirm (change_column_sql)
    reorg_table(table_name)
  end

  ensure
    IBM_DB.free_stmt(stmt) if stmt
end

#columns(table_name, name = nil) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3284

def columns(table_name, name = nil)
  columns = super(table_name, name)
  # need a each modified version of below ...
  # IBM i old PTF IBM i returns 'TOAD,
  # but Arabic, Hebrew need single quote start, 
  # so hack below not work (maybe add anyway?)  
  # unless column_default_value.nil?
  #   if column_default_value[0] == "'"
  #     column_default_value = column_default_value[1..-1]
  #   end
  # end
  columns
end

#columns_for_distinct(columns, orders) ⇒ Object

T009: IBM DB requires the ORDER BY columns in the select list for distinct queries, and requires that the ORDER BY include the distinct column.

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3227

def columns_for_distinct(columns, orders)
  order_columns = orders.map{ |s|
      # Convert Arel node to string
      s = s.to_sql unless s.is_a?(String)
      # Remove any ASC/DESC modifiers
      s.gsub(/\s+(ASC|DESC)\s*(NULLS\s+(FIRST|LAST)\s*)?/i, '')
    }.reject(&:blank?).map.with_index { |column, i| "#{column} AS alias_#{i}" }
  [columns, *order_columns].join(', ')
end

#create_database(dbName, codeSet = nil, mode = nil) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3404

def create_database(dbName, codeSet=nil, mode=nil)
  execute("CREATE COLLECTION #{dbName}")
  true
end

#drop_database(dbName) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3384

def drop_database(dbName)
  qcmdexc2 "QSYS/CHGJOB INQMSGRPY(*SYSRPYL)"
  qcmdexc2 "ADDRPYLE SEQNBR(4321) MSGID(CPA7025) RPY(''I'')"
  isolation = IBM_DB.getoption(@adapter.connection,IBM_DB::SQL_ATTR_TXN_ISOLATION,1)
  IBM_DB.setoption(@adapter.connection,{IBM_DB::SQL_ATTR_TXN_ISOLATION=>IBM_DB::SQL_TXN_NO_COMMIT},1)
  execute "DROP COLLECTION #{dbName}"
  qcmdexc2 "QSYS/CHGJOB INQMSGRPY(*DFT)"
  qcmdexc2 "RMVRPYLE SEQNBR(4321)"
  IBM_DB.setoption(@adapter.connection,{IBM_DB::SQL_ATTR_TXN_ISOLATION=>isolation},1)
  true
end

#error_number(messsage) ⇒ Object

:nodoc:

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3249

def error_number(messsage) # :nodoc:
  m = /(SQLCODE=)(-\d{1,6})/.match(messsage)
  return m[2].to_i if m
end

#execute_and_auto_confirm(sql) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3313

def execute_and_auto_confirm(sql)
  begin
    qcmdexc2 "QSYS/CHGJOB INQMSGRPY(*SYSRPYL)"
    qcmdexc2 "ADDRPYLE SEQNBR(9876) MSGID(CPA32B2) RPY(''I'')"
  rescue Exception => e
    raise "Could not call CHGJOB INQMSGRPY(*SYSRPYL) and ADDRPYLE SEQNBR(9876) MSGID(CPA32B2) RPY('I').\n" +
          "Do you have authority to do this?\n\n" + e.to_s
  end

  r = execute sql

  begin
    qcmdexc2 "QSYS/CHGJOB INQMSGRPY(*DFT)'"
    qcmdexc2 "RMVRPYLE SEQNBR(9876)"
  rescue Exception => e
    raise "Could not call CHGJOB INQMSGRPY(*DFT) and RMVRPYLE SEQNBR(9876).\n" +
          "Do you have authority to do this?\n\n" + e.to_s
  end
  r
end

#indexes(table_name, name = nil) ⇒ Object

Returns an array of non-primary key indexes for a specified table name

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3271

def indexes(table_name, name = nil)
  # IBM i issue with fetch lob when autocommit=off (DB2 PTF not applied all machines)
  hackibmi = IBM_DB.autocommit(@adapter.connection) == IBM_DB::SQL_AUTOCOMMIT_OFF
  if hackibmi == true
    IBM_DB.autocommit @adapter.connection, IBM_DB::SQL_AUTOCOMMIT_ON
  end
  indexes = super(table_name, name)
  if hackibmi == true
    IBM_DB.autocommit @adapter.connection, IBM_DB::SQL_AUTOCOMMIT_OFF
  end
  indexes
end

#qcmdexc(cmd) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3298

def qcmdexc(cmd)
  occur = cmd.count("''")
  occur = occur/2
  len = cmd.length - occur
  sql = "CALL QSYS2.QCMDEXC('#{cmd}',#{len})"
  execute sql
end

#qcmdexc2(cmd) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3306

def qcmdexc2(cmd)
  begin
    qcmdexc(cmd)
  rescue Exception => e
  end
end

#quote_date_time_for_pstmt(value, column = nil) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3254

def quote_date_time_for_pstmt(value, column=nil)
  if column && column.sql_type == 'time' # T006 time format
    sep = TIME_SEP_CHAR[@adapter.time_sep]
    value = value.to_s[/\d\d#{sep}\d\d#{sep}\d\d/] 
  elsif value.acts_like?(:date)
    if column && column.sql_type == 'timestamp' # T013 timestamp format
      value = value.to_time
    end
    value = @adapter.quoted_date(value)
  elsif value.acts_like?(:time)
    value = @adapter.quoted_date(value)
  else
    value.to_yaml
  end
end

#remove_column(table_name, column_name) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3396

def remove_column(table_name,column_name)
  qcmdexc2 "QSYS/CHGJOB INQMSGRPY(*SYSRPYL)"
  qcmdexc2 "ADDRPYLE SEQNBR(9876) MSGID(CPA32B2) RPY(''I'')"
  super(table_name,column_name)
  qcmdexc2 "QSYS/CHGJOB INQMSGRPY(*DFT)"
  qcmdexc2 "RMVRPYLE SEQNBR(9876)"
end

#task_charset(task) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3436

def task_charset(task)
  @adapter.connection.charset
end

#task_collation(task) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3439

def task_collation(task)
  @adapter.connection.collation
end

#task_create(task) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3418

def task_create(task)
  filename = task_schema(task)
  create_database filename
  task.log("CREATE SCHEMA #{filename}")
end

#task_drop(task) ⇒ Object

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

def task_drop(task)
  filename = task_schema(task)
  task_structure_dump(task,filename)
  drop_database filename
  task.log("DROP SCHEMA #{filename}")
end

#task_purge(task) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3429

def task_purge(task)
  begin
    task_drop(task)
  rescue Exception => e
  end
  task_create(task)
end

#task_schema(task) ⇒ Object

Unit testing (SQLLiteDatabaseTasks, MySQLDatabaseTasks, PostgreSQLDatabaseTasks)

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

def task_schema(task)
  if task.configuration.has_key?('schema')
    return task.configuration['schema']
  end
  task.configuration['username'];
end

#task_structure_dump(task, filename = nil) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3442

def task_structure_dump(task,filename=nil)
  if task.configuration.has_key?('ibm_i_dump_savf')
    if !task.configuration['ibm_i_dump_savf']
      return
    end
  end
  if filename.nil?
    filename = task_schema(task)
  end
  savlibtime = Time.now
  lastyear = Time.new(Time.now.year.to_i - 1)
  savf = "RB" + (Time.now.to_i - lastyear.to_i).to_s
  # create savlib
  begin
    cmd = "CRTSAVF FILE(QGPL/#{savf}) TEXT(''#{filename} #{savlibtime}'')"
    qcmdexc cmd
    task.log(cmd)
  rescue Exception => e
    puts e.message
    task.log("#{cmd} : #{e.message}")
  end
  # save the library
  begin
    cmd = "SAVLIB LIB(#{filename}) DEV(*SAVF) SAVF(QGPL/#{savf}) CLEAR(*ALL)"
    qcmdexc cmd
    task.log(cmd)
  rescue Exception => e
    puts e.message
    task.log("#{cmd} : #{e.message}")
  end
end

#task_structure_load(task, filename = nil) ⇒ Object

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3473

def task_structure_load(task,filename=nil)
  if filename.nil?
    filename = task_schema(task)
  end
  # restore the library
  begin
    cmd = "RSTLIB SAVLIB(#{filename}) DEV(*SAVF) SAVF(QGPL/#{filename}) MBROPT(*ALL) ALWOBJDIF(*ALL)"
    qcmdexc cmd
    task.log(cmd)
  rescue Exception => e
    puts e.message
    task.log("#{cmd} : #{e.message}")
  end
end

#translate_exception(exception, message) ⇒ Object

T017|T023: raise the appropriate error

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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3238

def translate_exception(exception, message)
  case error_number(message)
  when -803
    RecordNotUnique.new(message, exception)
  when -530
    InvalidForeignKey.new(message, exception)
  else
    # would just be "super(x,y)" if this code was in IBM_DBAdapter
    @adapter.class.superclass.instance_method(:translate_exception).bind(@adapter).call(message, exception)
  end
end