Class: DbMeta::Oracle::Index

Inherits:
Base
  • Object
show all
Defined in:
lib/db_meta/oracle/types/index.rb

Constant Summary

Constants inherited from Base

Base::TYPES

Instance Attribute Summary collapse

Attributes inherited from Base

#extract_type, #name, #status, #system_object, #type

Instance Method Summary collapse

Methods inherited from Base

#ddl_drop, from_type, register_type, #system_object?

Methods included from Helper

#block, #create_folder, #pluralize, #remove_folder, #type_sequence, #write_buffer_to_file

Constructor Details

#initialize(args = {}) ⇒ Index

Returns a new instance of Index.



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# File 'lib/db_meta/oracle/types/index.rb', line 8

def initialize(args = {})
  super

  @extract_type = :embedded
  @columns = []
end

Instance Attribute Details

#index_type ⇒ Object (readonly)

Returns the value of attribute index_type.



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# File 'lib/db_meta/oracle/types/index.rb', line 6

def index_type
  @index_type
end

#table_name ⇒ Object (readonly)

Returns the value of attribute table_name.



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# File 'lib/db_meta/oracle/types/index.rb', line 6

def table_name
  @table_name
end

#tablespace ⇒ Object (readonly)

Returns the value of attribute tablespace.



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# File 'lib/db_meta/oracle/types/index.rb', line 6

def tablespace
  @tablespace
end

#uniqueness ⇒ Object (readonly)

Returns the value of attribute uniqueness.



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# File 'lib/db_meta/oracle/types/index.rb', line 6

def uniqueness
  @uniqueness
end

Instance Method Details

#extract(args = {}) ⇒ Object 



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# File 'lib/db_meta/oracle/types/index.rb', line 45

def extract(args = {})
  "CREATE#{(@uniqueness == "UNIQUE") ? " UNIQUE" : nil} INDEX #{@name} ON #{@table_name}(#{@columns.join(", ")});"
end

#fetch(args = {}) ⇒ Object 



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# File 'lib/db_meta/oracle/types/index.rb', line 15

def fetch(args = {})
  connection_class = args[:connection_class] || Connection
  connection = connection_class.instance.get
  cursor = connection.exec("select index_type, table_name, uniqueness, tablespace_name from user_indexes where index_name = '#{@name}'")
  while (row = cursor.fetch)
    @index_type = row[0].to_s
    @table_name = row[1].to_s
    @uniqueness = row[2].to_s
    @tablespace = row[3].to_s
  end
  cursor.close

  # involved columns
  cursor = connection.exec("select column_name from user_ind_columns where index_name = '#{@name}' order by column_position")
  while (row = cursor.fetch)
    @columns << row[0].to_s
  end
  cursor.close

  # columns for function based indexs
  cursor = connection.exec("select column_expression, column_position from user_ind_expressions where index_name = '#{@name}' order by column_position")
  while (row = cursor.fetch)
    idx = row[1].to_i - 1
    @columns[idx] = row[0] # replace sys_... entry
  end
  cursor.close
ensure
  connection.logoff
end