Module: ActiveRecord::ConnectionAdapters::OracleEnhanced::SchemaStatements

Included in:
ActiveRecord::ConnectionAdapters::OracleEnhancedAdapter
Defined in:
lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb

Instance Method Summary collapse

Instance Method Details

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

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 277

def add_column(table_name, column_name, type, options = {}) #:nodoc:
  if type.to_sym == :virtual
    type = options[:type]
  end
  type = aliased_types(type.to_s, type)
  add_column_sql = "ALTER TABLE #{quote_table_name(table_name)} ADD #{quote_column_name(column_name)} "
  add_column_sql << type_to_sql(type, options[:limit], options[:precision], options[:scale]) if type

  add_column_options!(add_column_sql, options.merge(:type=>type, :column_name=>column_name, :table_name=>table_name))

  add_column_sql << tablespace_for((type_to_sql(type).downcase.to_sym), nil, table_name, column_name) if type

  execute(add_column_sql)

  create_sequence_and_trigger(table_name, options) if type && type.to_sym == :primary_key
ensure
  clear_table_columns_cache(table_name)
end

#add_comment(table_name, column_name, comment) ⇒ Object

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 354

def add_comment(table_name, column_name, comment) #:nodoc:
  return if comment.blank?
  execute "COMMENT ON COLUMN #{quote_table_name(table_name)}.#{column_name} IS '#{comment}'"
end

#add_foreign_key(from_table, to_table, options = {}) ⇒ Object 


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 399

def add_foreign_key(from_table, to_table, options = {})
  if options[:dependent]
    ActiveSupport::Deprecation.warn "`:dependent` option will be deprecated. Please use `:on_delete` option"
  end
  case options[:dependent]  
  when :delete then options[:on_delete] = :cascade
  when :nullify then options[:on_delete] = :nullify
  else
  end

  super
end

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

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 161

def add_index(table_name, column_name, options = {}) #:nodoc:
  index_name, index_type, quoted_column_names, tablespace, index_options = add_index_options(table_name, column_name, options)
  execute "CREATE #{index_type} INDEX #{quote_column_name(index_name)} ON #{quote_table_name(table_name)} (#{quoted_column_names})#{tablespace} #{index_options}"
  if index_type == 'UNIQUE'
    unless quoted_column_names =~ /\(.*\)/
      execute "ALTER TABLE #{quote_table_name(table_name)} ADD CONSTRAINT #{quote_column_name(index_name)} #{index_type} (#{quoted_column_names})"
    end
  end
ensure
  self.all_schema_indexes = nil
end

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

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 173

def add_index_options(table_name, column_name, options = {}) #:nodoc:
  column_names = Array(column_name)
  index_name   = index_name(table_name, column: column_names)

  options.assert_valid_keys(:unique, :order, :name, :where, :length, :internal, :tablespace, :options, :using)

  index_type = options[:unique] ? "UNIQUE" : ""
  index_name = options[:name].to_s if options.key?(:name)
  tablespace = tablespace_for(:index, options[:tablespace])
  max_index_length = options.fetch(:internal, false) ? index_name_length : allowed_index_name_length  #TODO: This option is used for NOLOGGING, needs better argumetn name

  index_options = options[:options]

  if index_name.to_s.length > max_index_length
    raise ArgumentError, "Index name '#{index_name}' on table '#{table_name}' is too long; the limit is #{max_index_length} characters"
  end
  if index_name_exists?(table_name, index_name, false)
    raise ArgumentError, "Index name '#{index_name}' on table '#{table_name}' already exists"
  end

  quoted_column_names = column_names.map { |e| quote_column_name_or_expression(e) }.join(", ")
   [index_name, index_type, quoted_column_names, tablespace, index_options]
end

#add_table_comment(table_name, comment) ⇒ Object

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 359

def add_table_comment(table_name, comment) #:nodoc:
  return if comment.blank?
  execute "COMMENT ON TABLE #{quote_table_name(table_name)} IS '#{comment}'"
end

#aliased_types(name, fallback) ⇒ Object 


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 296

def aliased_types(name, fallback)
  fallback
end

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

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 316

def change_column(table_name, column_name, type, options = {}) #:nodoc:
  column = column_for(table_name, column_name)

  # remove :null option if its value is the same as current column definition
  # otherwise Oracle will raise error
  if options.has_key?(:null) && options[:null] == column.null
    options[:null] = nil
  end
  if type.to_sym == :virtual
    type = options[:type]
  end
  change_column_sql = "ALTER TABLE #{quote_table_name(table_name)} MODIFY #{quote_column_name(column_name)} "
  change_column_sql << "#{type_to_sql(type, options[:limit], options[:precision], options[:scale])}" if type

  add_column_options!(change_column_sql, options.merge(:type=>type, :column_name=>column_name, :table_name=>table_name))

  change_column_sql << tablespace_for((type_to_sql(type).downcase.to_sym), nil, options[:table_name], options[:column_name]) if type

  execute(change_column_sql)
ensure
  clear_table_columns_cache(table_name)
end

#change_column_default(table_name, column_name, default) ⇒ Object

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 300

def change_column_default(table_name, column_name, default) #:nodoc:
  execute "ALTER TABLE #{quote_table_name(table_name)} MODIFY #{quote_column_name(column_name)} DEFAULT #{quote(default)}"
ensure
  clear_table_columns_cache(table_name)
end

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

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 306

def change_column_null(table_name, column_name, null, default = nil) #:nodoc:
  column = column_for(table_name, column_name)

  unless null || default.nil?
    execute("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL")
  end

  change_column table_name, column_name, column.sql_type, :null => null
end

#column_comment(table_name, column_name) ⇒ Object

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 373

def column_comment(table_name, column_name) #:nodoc:
  (owner, table_name, db_link) = @connection.describe(table_name)
  select_value <<-SQL
    SELECT comments FROM all_col_comments#{db_link}
    WHERE owner = '#{owner}'
      AND table_name = '#{table_name}'
      AND column_name = '#{column_name.upcase}'
  SQL
end

#create_table(table_name, options = {}) {|td| ... } ⇒ Object

Additional options for create_table method in migration files.

You can specify individual starting value in table creation migration file, e.g.:

create_table :users, :sequence_start_value => 100 do |t|
  # ...
end

You can also specify other sequence definition additional parameters, e.g.:

create_table :users, :sequence_start_value => “100 NOCACHE INCREMENT BY 10” do |t|
  # ...
end

Create primary key trigger (so that you can skip primary key value in INSERT statement). By default trigger name will be “table_name_pkt”, you can override the name with :trigger_name option (but it is not recommended to override it as then this trigger will not be detected by ActiveRecord model and it will still do prefetching of sequence value). Example:

create_table :users, :primary_key_trigger => true do |t|
  # ...
end

It is possible to add table and column comments in table creation migration files:

create_table :employees, :comment => “Employees and contractors” do |t|
  t.string      :first_name, :comment => “Given name”
  t.string      :last_name, :comment => “Surname”
end

Yields:

  • (td) 

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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 43

def create_table(table_name, options = {})
  create_sequence = options[:id] != false
  column_comments = {}
  temporary = options.delete(:temporary)
  additional_options = options
  td = create_table_definition table_name, temporary, additional_options
  td.primary_key(options[:primary_key] || Base.get_primary_key(table_name.to_s.singularize)) unless options[:id] == false

  # store that primary key was defined in create_table block
  unless create_sequence
    class << td
      attr_accessor :create_sequence
      def primary_key(*args)
        self.create_sequence = true
        super(*args)
      end
    end
  end

  # store column comments
  class << td
    attr_accessor :column_comments
    def column(name, type, options = {})
      if options[:comment]
        self.column_comments ||= {}
        self.column_comments[name] = options[:comment]
      end
      super(name, type, options)
    end
  end

  yield td if block_given?
  create_sequence = create_sequence || td.create_sequence
  column_comments = td.column_comments if td.column_comments

  if options[:force] && table_exists?(table_name)
    drop_table(table_name, options)
  end

  execute schema_creation.accept td

  create_sequence_and_trigger(table_name, options) if create_sequence

  add_table_comment table_name, options[:comment]
  column_comments.each do |column_name, comment|
    add_comment table_name, column_name, comment
  end
  td.indexes.each_pair { |c,o| add_index table_name, c, o }

  td.foreign_keys.each_pair do |other_table_name, foreign_key_options|
    add_foreign_key(table_name, other_table_name, foreign_key_options)
  end
end

#create_table_definition(name, temporary, options) ⇒ Object 


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 97

def create_table_definition(name, temporary, options)
  ActiveRecord::ConnectionAdapters::OracleEnhanced::TableDefinition.new native_database_types, name, temporary, options
end

#disable_referential_integrity(&block) ⇒ Object

REFERENTIAL INTEGRITY ====================================


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 461

def disable_referential_integrity(&block) #:nodoc:
  sql_constraints = <<-SQL
  SELECT constraint_name, owner, table_name
    FROM user_constraints
    WHERE constraint_type = 'R'
    AND status = 'ENABLED'
  SQL
  old_constraints = select_all(sql_constraints)
  begin
    old_constraints.each do |constraint|
      execute "ALTER TABLE #{constraint["table_name"]} DISABLE CONSTRAINT #{constraint["constraint_name"]}"
    end
    yield
  ensure
    old_constraints.each do |constraint|
      execute "ALTER TABLE #{constraint["table_name"]} ENABLE CONSTRAINT #{constraint["constraint_name"]}"
    end
  end
end

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

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 111

def drop_table(table_name, options = {}) #:nodoc:
  execute "DROP TABLE #{quote_table_name(table_name)}#{' CASCADE CONSTRAINTS' if options[:force] == :cascade}"
  seq_name = options[:sequence_name] || default_sequence_name(table_name)
  execute "DROP SEQUENCE #{quote_table_name(seq_name)}" rescue nil
rescue ActiveRecord::StatementInvalid => e
  raise e unless options[:if_exists]
ensure
  clear_table_columns_cache(table_name)
  self.all_schema_indexes = nil
end

#dump_schema_information ⇒ Object

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 122

def dump_schema_information #:nodoc:
  sm_table = ActiveRecord::Migrator.schema_migrations_table_name
  migrated = select_values("SELECT version FROM #{sm_table} ORDER BY version")
  join_with_statement_token(migrated.map{|v| "INSERT INTO #{sm_table} (version) VALUES ('#{v}')" })
end

#extract_foreign_key_action(specifier) ⇒ Object

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 452

def extract_foreign_key_action(specifier) # :nodoc:
  case specifier
  when 'CASCADE'; :cascade
  when 'SET NULL'; :nullify
  end
end

#foreign_keys(table_name) ⇒ Object

get table foreign keys for schema dump


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 417

def foreign_keys(table_name) #:nodoc:
  (owner, desc_table_name, db_link) = @connection.describe(table_name)

  fk_info = select_all(<<-SQL, 'Foreign Keys')
    SELECT r.table_name to_table
          ,rc.column_name references_column
          ,cc.column_name
          ,c.constraint_name name
          ,c.delete_rule
      FROM user_constraints#{db_link} c, user_cons_columns#{db_link} cc,
           user_constraints#{db_link} r, user_cons_columns#{db_link} rc
     WHERE c.owner = '#{owner}'
       AND c.table_name = '#{desc_table_name}'
       AND c.constraint_type = 'R'
       AND cc.owner = c.owner
       AND cc.constraint_name = c.constraint_name
       AND r.constraint_name = c.r_constraint_name
       AND r.owner = c.owner
       AND rc.owner = r.owner
       AND rc.constraint_name = r.constraint_name
       AND rc.position = cc.position
    ORDER BY name, to_table, column_name, references_column
  SQL

  fk_info.map do |row|
    options = {
      column: oracle_downcase(row['column_name']),
      name: oracle_downcase(row['name']),
      primary_key: oracle_downcase(row['references_column'])
    }
    options[:on_delete] = extract_foreign_key_action(row['delete_rule'])
    OracleEnhanced::ForeignKeyDefinition.new(oracle_downcase(table_name), oracle_downcase(row['to_table']), options)
  end
end

#index_name(table_name, options) ⇒ Object

returned shortened index name if default is too large


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 225

def index_name(table_name, options) #:nodoc:
  default_name = super(table_name, options).to_s  # sometimes options can be String or Array with column names

  options = {} unless options.is_a?(Hash)
  identifier_max_length = options[:identifier_max_length] || index_name_length
  return default_name if default_name.length <= identifier_max_length

  # remove 'index', 'on' and 'and' keywords
  shortened_name = "i_#{table_name}_#{Array(options[:column]) * '_'}"

  # leave just first three letters from each word
  if shortened_name.length > identifier_max_length
    shortened_name = shortened_name.split('_').map{|w| w[0,3]}.join('_')
  end  # generate unique name using hash function

  if shortened_name.length > identifier_max_length
    shortened_name = 'i'+Digest::SHA1.hexdigest(default_name)[0,identifier_max_length-1]
  end
  @logger.warn "#{adapter_name} shortened default index name #{default_name} to #{shortened_name}" if @logger
  shortened_name
end

#index_name_exists?(table_name, index_name, default) ⇒ Boolean

Verify the existence of an index with a given name.

The default argument is returned if the underlying implementation does not define the indexes method, as there's no way to determine the correct answer in that case.

Will always query database and not index cache.


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 253

def index_name_exists?(table_name, index_name, default)
  (owner, table_name, db_link) = @connection.describe(table_name)
  result = select_value(<<-SQL)
    SELECT 1 FROM all_indexes#{db_link} i
    WHERE i.owner = '#{owner}'
       AND i.table_owner = '#{owner}'
       AND i.table_name = '#{table_name}'
       AND i.index_name = '#{index_name.to_s.upcase}'
  SQL
  result == 1
end

#initialize_schema_migrations_table ⇒ Object 


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 128

def initialize_schema_migrations_table
  sm_table = ActiveRecord::Migrator.schema_migrations_table_name

  unless table_exists?(sm_table)
    index_name = "#{Base.table_name_prefix}unique_schema_migrations#{Base.table_name_suffix}"
    if index_name.length > index_name_length
      truncate_to    = index_name_length - index_name.to_s.length - 1
      truncated_name = "unique_schema_migrations"[0..truncate_to]
      index_name     = "#{Base.table_name_prefix}#{truncated_name}#{Base.table_name_suffix}"
    end

    create_table(sm_table, :id => false) do |schema_migrations_table|
      schema_migrations_table.column :version, :string, :null => false
    end
    add_index sm_table, :version, :unique => true, :name => index_name

    # Backwards-compatibility: if we find schema_info, assume we've
    # migrated up to that point:
    si_table = Base.table_name_prefix + 'schema_info' + Base.table_name_suffix
    if table_exists?(si_table)
      ActiveSupport::Deprecation.warn "Usage of the schema table `#{si_table}` is deprecated. Please switch to using `schema_migrations` table"

      old_version = select_value("SELECT version FROM #{quote_table_name(si_table)}").to_i
      assume_migrated_upto_version(old_version)
      drop_table(si_table)
    end
  end
end

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

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 347

def remove_column(table_name, column_name, type = nil, options = {}) #:nodoc:
  execute "ALTER TABLE #{quote_table_name(table_name)} DROP COLUMN #{quote_column_name(column_name)} CASCADE CONSTRAINTS"
ensure
  clear_table_columns_cache(table_name)
  self.all_schema_indexes = nil
end

#remove_foreign_key(from_table, options_or_to_table = {}) ⇒ Object 


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 412

def remove_foreign_key(from_table, options_or_to_table = {})
  super
end

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

Remove the given index from the table. Gives warning if index does not exist


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 199

def remove_index(table_name, options = {}) #:nodoc:
  index_name = index_name(table_name, options)
  unless index_name_exists?(table_name, index_name, true)    # sometimes options can be String or Array with column names

    options = {} unless options.is_a?(Hash)
    if options.has_key? :name
      options_without_column = options.dup
      options_without_column.delete :column
      index_name_without_column = index_name(table_name, options_without_column)
      return index_name_without_column if index_name_exists?(table_name, index_name_without_column, false)
    end
    raise ArgumentError, "Index name '#{index_name}' on table '#{table_name}' does not exist"
  end
  remove_index!(table_name, index_name)
end

#remove_index!(table_name, index_name) ⇒ Object

clear cached indexes when removing index


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 216

def remove_index!(table_name, index_name) #:nodoc:
  #TODO: It should execute only when index_type == "UNIQUE"
  execute "ALTER TABLE #{quote_table_name(table_name)} DROP CONSTRAINT #{quote_column_name(index_name)}" rescue nil
  execute "DROP INDEX #{quote_column_name(index_name)}"
ensure
  self.all_schema_indexes = nil
end

#rename_column(table_name, column_name, new_column_name) ⇒ Object

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 339

def rename_column(table_name, column_name, new_column_name) #:nodoc:
  execute "ALTER TABLE #{quote_table_name(table_name)} RENAME COLUMN #{quote_column_name(column_name)} to #{quote_column_name(new_column_name)}"
  self.all_schema_indexes = nil
  rename_column_indexes(table_name, column_name, new_column_name)
ensure
  clear_table_columns_cache(table_name)
end

#rename_index(table_name, old_name, new_name) ⇒ Object

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 265

def rename_index(table_name, old_name, new_name) #:nodoc:
  unless index_name_exists?(table_name, old_name, true)
    raise ArgumentError, "Index name '#{old_name}' on table '#{table_name}' does not exist"
  end
  if new_name.length > allowed_index_name_length
    raise ArgumentError, "Index name '#{new_name}' on table '#{table_name}' is too long; the limit is #{allowed_index_name_length} characters"
  end
  execute "ALTER INDEX #{quote_column_name(old_name)} rename to #{quote_column_name(new_name)}"
ensure
  self.all_schema_indexes = nil
end

#rename_table(table_name, new_name) ⇒ Object

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 101

def rename_table(table_name, new_name) #:nodoc:
  if new_name.to_s.length > table_name_length
    raise ArgumentError, "New table name '#{new_name}' is too long; the limit is #{table_name_length} characters"
  end
  execute "RENAME #{quote_table_name(table_name)} TO #{quote_table_name(new_name)}"
  execute "RENAME #{quote_table_name("#{table_name}_seq")} TO #{default_sequence_name(new_name)}" rescue nil

  rename_table_indexes(table_name, new_name)
end

#table_comment(table_name) ⇒ Object

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 364

def table_comment(table_name) #:nodoc:
  (owner, table_name, db_link) = @connection.describe(table_name)
  select_value <<-SQL
    SELECT comments FROM all_tab_comments#{db_link}
    WHERE owner = '#{owner}'
      AND table_name = '#{table_name}'
  SQL
end

#tablespace(table_name) ⇒ Object 


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 391

def tablespace(table_name)
  select_value <<-SQL
    SELECT tablespace_name
    FROM user_tables
    WHERE table_name='#{table_name.to_s.upcase}'
  SQL
end

#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object

Maps logical Rails types to Oracle-specific data types.


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 384

def type_to_sql(type, limit = nil, precision = nil, scale = nil) #:nodoc:
  # Ignore options for :text and :binary columns
  return super(type, nil, nil, nil) if ['text', 'binary'].include?(type.to_s)

  super
end

#update_table_definition(table_name, base) ⇒ Object

:nodoc:


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# File 'lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb', line 157

def update_table_definition(table_name, base) #:nodoc:
  OracleEnhanced::Table.new(table_name, base)
end