Module: ArJdbc::Oracle

Included in:
ActiveRecord::ConnectionAdapters::OracleAdapter
Defined in:
lib/arjdbc/oracle/column.rb,
lib/arjdbc/oracle/adapter.rb

Defined Under Namespace

Modules: Column Classes: TableDefinition

Constant Summary collapse

ADAPTER_NAME = 
'Oracle'.freeze
NATIVE_DATABASE_TYPES = 
{
  :primary_key => "NUMBER(38) NOT NULL PRIMARY KEY",
  :string => { :name => "VARCHAR2", :limit => 255 },
  :text => { :name => "CLOB" },
  :integer => { :name => "NUMBER", :limit => 38 },
  :float => { :name => "NUMBER" },
  :decimal => { :name => "DECIMAL" },
  :datetime => { :name => "DATE" },
  :timestamp => { :name => "TIMESTAMP" },
  :time => { :name => "DATE" },
  :date => { :name => "DATE" },
  :binary => { :name => "BLOB" },
  :boolean => { :name => "NUMBER", :limit => 1 },
  :raw => { :name => "RAW", :limit => 2000 },
  :xml => { :name => 'XMLTYPE' }
}
IDENTIFIER_LENGTH = 
30

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.arel_visitor_type(config = nil) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 87

def self.arel_visitor_type(config = nil)
  ::Arel::Visitors::Oracle
end

.column_selector ⇒ Object

See Also:

  • ActiveRecord::ConnectionAdapters::JdbcColumn#column_types


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# File 'lib/arjdbc/oracle/column.rb', line 5

def self.column_selector
  [ /oracle/i, lambda { |config, column| column.extend(Column) } ]
end

.emulate_booleans ⇒ Object

Deprecated.

Use #emulate_booleans? instead.



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# File 'lib/arjdbc/oracle/adapter.rb', line 67

def self.emulate_booleans; @@emulate_booleans; end

.emulate_booleans=(emulate) ⇒ Object

See Also:

  • #emulate_booleans?


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# File 'lib/arjdbc/oracle/adapter.rb', line 69

def self.emulate_booleans=(emulate); @@emulate_booleans = emulate; end

.emulate_booleans? ⇒ Boolean

Boolean emulation can be disabled using :

ArJdbc::Oracle.emulate_booleans = false

Returns:

  • (Boolean)

See Also:

  • ActiveRecord::ConnectionAdapters::OracleAdapter#emulate_booleans


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# File 'lib/arjdbc/oracle/adapter.rb', line 65

def self.emulate_booleans?; @@emulate_booleans; end

.jdbc_connection_class ⇒ Object

See Also:



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# File 'lib/arjdbc/oracle/adapter.rb', line 29

def self.jdbc_connection_class
  ::ActiveRecord::ConnectionAdapters::OracleJdbcConnection
end

.update_lob_values=(update) ⇒ Object

See Also:

  • #update_lob_values?


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# File 'lib/arjdbc/oracle/adapter.rb', line 49

def self.update_lob_values=(update); @@update_lob_values = update; end

.update_lob_values? ⇒ Boolean

Note:

This only applies when prepared statements are not used.

Updating records with LOB values (binary/text columns) in a separate statement can be disabled using :

ArJdbc::Oracle.update_lob_values = false

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/oracle/adapter.rb', line 47

def self.update_lob_values?; @@update_lob_values; end

Instance Method Details

#adapter_name ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 99

def adapter_name
  ADAPTER_NAME
end

#add_column_options!(sql, options) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 259

def add_column_options!(sql, options)
  # handle case  of defaults for CLOB columns, which would otherwise get "quoted" incorrectly
  if options_include_default?(options) && (column = options[:column]) && column.type == :text
    sql << " DEFAULT #{quote(options.delete(:default))}"
  end
  super
end

#add_limit_offset!(sql, options) ⇒ Object

Note:

Only used with (non-AREL) ActiveRecord 2.3.

See Also:

  • Arel::Visitors::Oracle


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# File 'lib/arjdbc/oracle/adapter.rb', line 215

def add_limit_offset!(sql, options)
  offset = options[:offset] || 0
  if limit = options[:limit]
    sql.replace "SELECT * FROM " <<
      "(select raw_sql_.*, rownum raw_rnum_ from (#{sql}) raw_sql_ where rownum <= #{offset + limit})" <<
      " WHERE raw_rnum_ > #{offset}"
  elsif offset > 0
    sql.replace "SELECT * FROM " <<
      "(select raw_sql_.*, rownum raw_rnum_ from (#{sql}) raw_sql_)" <<
      " WHERE raw_rnum_ > #{offset}"
  end
end

#add_order_by_for_association_limiting!(sql, options) ⇒ Object

ORDER BY clause for the passed order option.

Uses column aliases as defined by #distinct.



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# File 'lib/arjdbc/oracle/adapter.rb', line 324

def add_order_by_for_association_limiting!(sql, options)
  return sql if options[:order].blank?

  order_columns = extract_order_columns(options[:order]) do |columns|
    columns.map! { |s| $1 if s =~ / (.*)/ }; columns
  end
  order = order_columns.map { |s, i| "alias_#{i}__ #{s}" } # @see {#distinct}

  sql << "ORDER BY #{order.join(', ')}"
end

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



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# File 'lib/arjdbc/oracle/adapter.rb', line 268

def change_column(table_name, column_name, type, options = {})
  change_column_sql = "ALTER TABLE #{quote_table_name(table_name)} " <<
    "MODIFY #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit])}"
  add_column_options!(change_column_sql, options)
  execute(change_column_sql)
end

#change_column_default(table_name, column_name, default) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 253

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

#charset ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 360

def charset
  database_parameters['NLS_CHARACTERSET']
end

#collation ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 364

def collation
  database_parameters['NLS_COMP']
end

#column_name_length ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 144

def column_name_length; IDENTIFIER_LENGTH; end

#columns(table_name, name = nil) ⇒ Object

NOTE: better to use current_schema instead of the configured one ?!



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# File 'lib/arjdbc/oracle/adapter.rb', line 352

def columns(table_name, name = nil)
  @connection.columns_internal(table_name.to_s, nil, oracle_schema)
end

#columns_for_distinct(columns, orders) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 305

def columns_for_distinct(columns, orders)
  return columns if orders.blank?
  if orders.is_a?(Array) # AR 3.x vs 4.x
    orders = orders.map { |column| column.is_a?(String) ? column : column.to_sql }
  else
    orders = extract_order_columns(orders)
  end
  # construct a valid DISTINCT clause, ie. one that includes the ORDER BY columns, using
  # FIRST_VALUE such that the inclusion of these columns doesn't invalidate the DISTINCT
  order_columns = orders.map do |c, i|
    "FIRST_VALUE(#{c.split.first}) OVER (PARTITION BY #{columns} ORDER BY #{c}) AS alias_#{i}__"
  end
  columns = [ columns ]; columns.flatten!
  columns.push( *order_columns ).join(', ')
end

#create_table(name, options = {}) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 152

def create_table(name, options = {})
  super(name, options)
  unless options[:id] == false
    seq_name = options[:sequence_name] || default_sequence_name(name)
    start_value = options[:sequence_start_value] || 10000
    raise ActiveRecord::StatementInvalid.new("name #{seq_name} too long") if seq_name.length > table_alias_length
    execute "CREATE SEQUENCE #{quote_table_name(seq_name)} START WITH #{start_value}"
  end
end

#current_database ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 232

def current_database
  @current_database ||= execute("SELECT sys_context('userenv', 'db_name') db FROM dual").first['db']
end

#current_schema ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 236

def current_schema
  execute("SELECT sys_context('userenv', 'current_schema') schema FROM dual").first['schema']
end

#current_schema=(schema_owner) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 240

def current_schema=(schema_owner)
  execute("ALTER SESSION SET current_schema=#{schema_owner}")
end

#current_user ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 228

def current_user
  @current_user ||= execute("SELECT sys_context('userenv', 'session_user') su FROM dual").first['su']
end

#database_parameters ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 368

def database_parameters
  return @database_parameters unless ( @database_parameters ||= {} ).empty?
  @connection.execute_query_raw("SELECT * FROM NLS_DATABASE_PARAMETERS") do
    |name, value| @database_parameters[name] = value
  end
  @database_parameters
end

#default_sequence_name(table_name, column = nil) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 146

def default_sequence_name(table_name, column = nil)
  # TODO: remove schema prefix if present (before truncating)
  "#{table_name.to_s[0, IDENTIFIER_LENGTH - 4]}_seq"
end

#distinct(columns, order_by) ⇒ Object

SELECT DISTINCT clause for a given set of columns and a given ORDER BY clause.

Oracle requires the ORDER BY columns to be in the SELECT list for DISTINCT queries. However, with those columns included in the SELECT DISTINCT list, you won't actually get a distinct list of the column you want (presuming the column has duplicates with multiple values for the ordered-by columns. So we use the FIRST_VALUE function to get a single (first) value for each column, effectively making every row the same.

distinct("posts.id", "posts.created_at desc")



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# File 'lib/arjdbc/oracle/adapter.rb', line 300

def distinct(columns, order_by)
  "DISTINCT #{columns_for_distinct(columns, order_by)}"
end

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



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# File 'lib/arjdbc/oracle/adapter.rb', line 175

def drop_table(name, options = {})
  outcome = super(name)
  return outcome if name == 'schema_migrations'
  seq_name = options.key?(:sequence_name) ? # pass nil/false - no sequence
    options[:sequence_name] : default_sequence_name(name)
  return outcome unless seq_name
  execute "DROP SEQUENCE #{quote_table_name(seq_name)}" rescue nil
end

#exec_insert(sql, name, binds, pk = nil, sequence_name = nil) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 561

def exec_insert(sql, name, binds, pk = nil, sequence_name = nil)
  if pk && use_insert_returning?
    exec_query(sql, name, binds) # due RETURNING clause
  else
    super(sql, name, binds) # assume no generated id for table
  end
end

#explain(arel, binds = []) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 490

def explain(arel, binds = [])
  sql = "EXPLAIN PLAN FOR #{to_sql(arel, binds)}"
  return if sql =~ /FROM all_/
  exec_update(sql, 'EXPLAIN', binds)
  select_values("SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY)", 'EXPLAIN').join("\n")
end

#in_clause_length ⇒ Object Also known as: ids_in_list_limit

Prevent ORA-01795 for in clauses with more than 1000



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# File 'lib/arjdbc/oracle/adapter.rb', line 133

def in_clause_length
  1000
end

#index_name_length ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 143

def index_name_length;  IDENTIFIER_LENGTH; end

#indexes(table, name = nil) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 209

def indexes(table, name = nil)
  @connection.indexes(table, name, @connection.connection.meta_data.user_name)
end

#insert(arel, name = nil, pk = nil, id_value = nil, sequence_name = nil, binds = []) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 547

def insert(arel, name = nil, pk = nil, id_value = nil, sequence_name = nil, binds = [])
  # NOTE: ActiveRecord::Relation calls our {#next_sequence_value}
  # (from its `insert`) and passes the returned id_value here ...
  sql, binds = sql_for_insert(to_sql(arel, binds), pk, id_value, sequence_name, binds)
  if id_value
    exec_update(sql, name, binds)
    return id_value
  else
    value = exec_insert(sql, name, binds, pk, sequence_name)
    id_value || last_inserted_id(value)
  end
end

#insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) ⇒ Object (protected) 



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# File 'lib/arjdbc/oracle/adapter.rb', line 522

def insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
  # if PK is already pre-fetched from sequence or if there is no PK :
  if id_value || pk.nil?
    execute(sql, name)
    return id_value
  end

  if pk && use_insert_returning? # true by default on AR <= 3.0
    sql = "#{sql} RETURNING #{quote_column_name(pk)}"
  end
  execute(sql, name)
end

#jdbc_column_class ⇒ Object

See Also:



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# File 'lib/arjdbc/oracle/adapter.rb', line 34

def jdbc_column_class
  ::ActiveRecord::ConnectionAdapters::OracleColumn
end

#modify_types(types) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 124

def modify_types(types)
  super(types)
  NATIVE_DATABASE_TYPES.each do |key, value|
    types[key] = value.dup
  end
  types
end

#native_database_types ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 120

def native_database_types
  super.merge(NATIVE_DATABASE_TYPES)
end

#next_sequence_value(sequence_name) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 515

def next_sequence_value(sequence_name)
  sequence_name = quote_table_name(sequence_name)
  sql = "SELECT #{sequence_name}.NEXTVAL id FROM dual"
  log(sql, 'SQL') { @connection.next_sequence_value(sequence_name) }
end

#prefetch_primary_key?(table_name = nil) ⇒ Boolean

Returns true for Oracle adapter (since Oracle requires primary key values to be pre-fetched before insert).

Returns:

  • (Boolean)

See Also:



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# File 'lib/arjdbc/oracle/adapter.rb', line 508

def prefetch_primary_key?(table_name = nil)
  return true if table_name.nil?
  table_name = table_name.to_s
  columns(table_name).count { |column| column.primary } == 1
end

#quote(value, column = nil) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 403

def quote(value, column = nil)
  return value if sql_literal?(value)

  column_type = column && column.type
  if column_type == :text || column_type == :binary
    return 'NULL' if value.nil? || value == ''
    if update_lob_value?(value, column)
      if /(.*?)\([0-9]+\)/ =~ ( sql_type = column.sql_type )
        %Q{empty_#{ $1.downcase }()}
      else
        %Q{empty_#{ sql_type.respond_to?(:downcase) ? sql_type.downcase : 'blob' }()}
      end
    else
      "'#{quote_string(value.to_s)}'"
    end
  elsif column_type == :xml
    "XMLTYPE('#{quote_string(value)}')" # XMLTYPE ?
  elsif column_type == :raw
    quote_raw(value)
  else
    if column.respond_to?(:primary) && column.primary && column.klass != String
      return value.to_i.to_s
    end

    if column_type == :datetime || column_type == :time
      if value.acts_like?(:time)
        %Q{TO_DATE('#{get_time(value).strftime("%Y-%m-%d %H:%M:%S")}','YYYY-MM-DD HH24:MI:SS')}
      else
        value.blank? ? 'NULL' : %Q{DATE'#{value}'} # assume correctly formated DATE (string)
      end
    elsif ( like_date = value.acts_like?(:date) ) || column_type == :date
      if value.acts_like?(:time) # value.respond_to?(:strftime)
        %Q{DATE'#{get_time(value).strftime("%Y-%m-%d")}'}
      elsif like_date
        %Q{DATE'#{quoted_date(value)}'} # DATE 'YYYY-MM-DD'
      else
        value.blank? ? 'NULL' : %Q{DATE'#{value}'} # assume correctly formated DATE (string)
      end
    elsif ( like_time = value.acts_like?(:time) ) || column_type == :timestamp
      if like_time
        %Q{TIMESTAMP'#{quoted_date(value, true)}'} # TIMESTAMP 'YYYY-MM-DD HH24:MI:SS.FF'
      else
        value.blank? ? 'NULL' : %Q{TIMESTAMP'#{value}'} # assume correctly formated TIMESTAMP (string)
      end
    else
      super
    end
  end
end

#quote_column_name(name) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 384

def quote_column_name(name)
  # if only valid lowercase column characters in name
  if ( name = name.to_s ) =~ /\A[a-z][a-z_0-9\$#]*\Z/
    # putting double-quotes around an identifier causes Oracle to treat the
    # identifier as case sensitive (otherwise assumes case-insensitivity) !
    # all upper case is an exception, where double-quotes are meaningless
    "\"#{name.upcase}\"" # name.upcase
  else
    # remove double quotes which cannot be used inside quoted identifier
    "\"#{name.gsub('"', '')}\""
  end
end

#quote_raw(value) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 465

def quote_raw(value)
  value = value.unpack('C*') if value.is_a?(String)
  "'#{value.map { |x| "%02X" % x }.join}'"
end

#quote_table_name(name) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 379

def quote_table_name(name)
  name.to_s.split('.').map{ |n| n.split('@').map{ |m| quote_column_name(m) }.join('@') }.join('.')
end

#quoted_date(value, time = nil) ⇒ Object

Quote date/time values for use in SQL input. Includes milliseconds if the value is a Time responding to usec.



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# File 'lib/arjdbc/oracle/adapter.rb', line 456

def quoted_date(value, time = nil)
  if time || ( time.nil? && value.acts_like?(:time) )
    usec = value.respond_to?(:usec) && (value.usec / 10000.0).round # .428000 -> .43
    return "#{get_time(value).to_s(:db)}.#{sprintf("%02d", usec)}" if usec
    # value.strftime("%Y-%m-%d %H:%M:%S")
  end
  value.to_s(:db)
end

#release_savepoint(name = nil) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 245

def release_savepoint(name = nil)
  # no RELEASE SAVEPOINT statement in Oracle (JDBC driver throws "Unsupported feature")
end

#remove_column(table_name, *column_names) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 282

def remove_column(table_name, *column_names)
  for column_name in column_names.flatten
    execute "ALTER TABLE #{quote_table_name(table_name)} DROP COLUMN #{quote_column_name(column_name)}"
  end
end

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



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# File 'lib/arjdbc/oracle/adapter.rb', line 249

def remove_index(table_name, options = {})
  execute "DROP INDEX #{index_name(table_name, options)}"
end

#rename_column(table_name, column_name, new_column_name) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 276

def rename_column(table_name, column_name, new_column_name)
  execute "ALTER TABLE #{quote_table_name(table_name)} " <<
    "RENAME COLUMN #{quote_column_name(column_name)} TO #{quote_column_name(new_column_name)}"
end

#rename_table(name, new_name) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 163

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

#select(sql, name = nil, binds = []) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 497

def select(sql, name = nil, binds = [])
  result = super # AR::Result (4.0) or Array (<= 3.2)
  result.columns.delete('raw_rnum_') if result.respond_to?(:columns)
  result.each { |row| row.delete('raw_rnum_') } # Hash rows even for AR::Result
  result
end

#sql_for_insert(sql, pk, id_value, sequence_name, binds) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 537

def sql_for_insert(sql, pk, id_value, sequence_name, binds)
  unless id_value || pk.nil?
    if pk && use_insert_returning?
      sql = "#{sql} RETURNING #{quote_column_name(pk)}"
    end
  end
  [ sql, binds ]
end

#supports_explain? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/oracle/adapter.rb', line 486

def supports_explain?
  true
end

#supports_migrations? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/oracle/adapter.rb', line 471

def supports_migrations?
  true
end

#supports_primary_key? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/oracle/adapter.rb', line 476

def supports_primary_key?
  true
end

#supports_savepoints? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/oracle/adapter.rb', line 481

def supports_savepoints?
  true
end

#table_alias_length ⇒ Object

maximum length of Oracle identifiers is 30



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# File 'lib/arjdbc/oracle/adapter.rb', line 141

def table_alias_length; IDENTIFIER_LENGTH; end

#table_definition(*args) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 83

def table_definition(*args)
  new_table_definition(TableDefinition, *args)
end

#table_name_length ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 142

def table_name_length;  IDENTIFIER_LENGTH; end

#tables ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 347

def tables
  @connection.tables(nil, oracle_schema)
end

#tablespace(table_name) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 356

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

#temporary_table?(table_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/oracle/adapter.rb', line 343

def temporary_table?(table_name)
  select_value("SELECT temporary FROM user_tables WHERE table_name = '#{table_name.upcase}'") == 'Y'
end

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



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# File 'lib/arjdbc/oracle/adapter.rb', line 185

def type_to_sql(type, limit = nil, precision = nil, scale = nil)
  case type.to_sym
  when :binary
    # { BLOB | BINARY LARGE OBJECT } [ ( length [{K |M |G }] ) ]
    # although Oracle does not like limit (length) with BLOB (or CLOB) :
    #
    # CREATE TABLE binaries (data BLOB, short_data BLOB(1024));
    # ORA-00907: missing right parenthesis             *
    #
    # TODO do we need to worry about NORMAL vs. non IN-TABLE BLOBs ?!
    # http://dba.stackexchange.com/questions/8770/improve-blob-writing-performance-in-oracle-11g
    # - if the LOB is smaller than 3900 bytes it can be stored inside the
    #   table row; by default this is enabled,
    #   unless you specify DISABLE STORAGE IN ROW
    # - normal LOB - stored in a separate segment, outside of table,
    #   you may even put it in another tablespace;
    super(type, nil, nil, nil)
  when :text
    super(type, nil, nil, nil)
  else
    super
  end
end

#unquote_table_name(name) ⇒ Object 



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# File 'lib/arjdbc/oracle/adapter.rb', line 397

def unquote_table_name(name)
  name = name[1...-1] if name[0, 1] == '"'
  name.upcase == name ? name.downcase : name
end

#update_lob_value?(value, column = nil) ⇒ Boolean

Returns:

  • (Boolean)

See Also:



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# File 'lib/arjdbc/oracle/adapter.rb', line 53

def update_lob_value?(value, column = nil)
  Oracle.update_lob_values? && ! prepared_statements? && ! ( value.nil? || value == '' )
end

#use_insert_returning? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/oracle/adapter.rb', line 580

def use_insert_returning?
  if ( @use_insert_returning ||= nil ).nil?
    @use_insert_returning = false
  end
  @use_insert_returning
end