/usr/lib/ruby/vendor_ruby/sequel/adapters/shared/oracle.rb is in ruby-sequel 4.15.0-1.
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module Sequel
module Oracle
module DatabaseMethods
extend Sequel::Database::ResetIdentifierMangling
TEMPORARY = 'GLOBAL TEMPORARY '.freeze
AUTOINCREMENT = ''.freeze
attr_accessor :autosequence
def create_sequence(name, opts=OPTS)
self << create_sequence_sql(name, opts)
end
def create_trigger(*args)
self << create_trigger_sql(*args)
end
def current_user
@current_user ||= metadata_dataset.get{sys_context('USERENV', 'CURRENT_USER')}
end
def drop_sequence(name)
self << drop_sequence_sql(name)
end
# Oracle uses the :oracle database type
def database_type
:oracle
end
def foreign_key_list(table, opts=OPTS)
m = output_identifier_meth
im = input_identifier_meth
schema, table = schema_and_table(table)
ds = metadata_dataset.
from(:all_cons_columns___pc, :all_constraints___p, :all_cons_columns___fc, :all_constraints___f).
where(:f__table_name=>im.call(table), :f__constraint_type=>'R', :p__owner=>:f__r_owner, :p__constraint_name=>:f__r_constraint_name, :pc__owner=>:p__owner, :pc__constraint_name=>:p__constraint_name, :pc__table_name=>:p__table_name, :fc__owner=>:f__owner, :fc__constraint_name=>:f__constraint_name, :fc__table_name=>:f__table_name, :fc__position=>:pc__position).
select(:p__table_name___table, :pc__column_name___key, :fc__column_name___column, :f__constraint_name___name).
order(:table, :fc__position)
ds = ds.where(:f__schema_name=>im.call(schema)) if schema
fks = {}
ds.each do |r|
if fk = fks[r[:name]]
fk[:columns] << m.call(r[:column])
fk[:key] << m.call(r[:key])
else
fks[r[:name]] = {:name=>m.call(r[:name]), :columns=>[m.call(r[:column])], :table=>m.call(r[:table]), :key=>[m.call(r[:key])]}
end
end
fks.values
end
# Oracle namespaces indexes per table.
def global_index_namespace?
false
end
IGNORE_OWNERS = %w'APEX_040000 CTXSYS EXFSYS MDSYS OLAPSYS ORDDATA ORDSYS SYS SYSTEM XDB XDBMETADATA XDBPM XFILES WMSYS'
def tables(opts=OPTS)
m = output_identifier_meth
metadata_dataset.from(:all_tables).
server(opts[:server]).
where(:dropped=>'NO').
exclude(:owner=>IGNORE_OWNERS).
select(:table_name).
map{|r| m.call(r[:table_name])}
end
def views(opts=OPTS)
m = output_identifier_meth
metadata_dataset.from(:all_views).
server(opts[:server]).
exclude(:owner=>IGNORE_OWNERS).
select(:view_name).
map{|r| m.call(r[:view_name])}
end
def view_exists?(name)
m = input_identifier_meth
metadata_dataset.from(:all_views).
exclude(:owner=>IGNORE_OWNERS).
where(:view_name=>m.call(name)).
count > 0
end
# Oracle supports deferrable constraints.
def supports_deferrable_constraints?
true
end
# Oracle supports transaction isolation levels.
def supports_transaction_isolation_levels?
true
end
private
# Handle Oracle specific ALTER TABLE SQL
def alter_table_sql(table, op)
case op[:op]
when :add_column
if op[:primary_key]
sqls = []
sqls << alter_table_sql(table, op.merge(:primary_key=>nil))
if op[:auto_increment]
seq_name = default_sequence_name(table, op[:name])
sqls << drop_sequence_sql(seq_name)
sqls << create_sequence_sql(seq_name, op)
sqls << "UPDATE #{quote_schema_table(table)} SET #{quote_identifier(op[:name])} = #{seq_name}.nextval"
end
sqls << "ALTER TABLE #{quote_schema_table(table)} ADD PRIMARY KEY (#{quote_identifier(op[:name])})"
sqls
else
"ALTER TABLE #{quote_schema_table(table)} ADD #{column_definition_sql(op)}"
end
when :set_column_null
"ALTER TABLE #{quote_schema_table(table)} MODIFY #{quote_identifier(op[:name])} #{op[:null] ? 'NULL' : 'NOT NULL'}"
when :set_column_type
"ALTER TABLE #{quote_schema_table(table)} MODIFY #{quote_identifier(op[:name])} #{type_literal(op)}"
when :set_column_default
"ALTER TABLE #{quote_schema_table(table)} MODIFY #{quote_identifier(op[:name])} DEFAULT #{literal(op[:default])}"
else
super(table, op)
end
end
def auto_increment_sql
AUTOINCREMENT
end
def create_sequence_sql(name, opts=OPTS)
"CREATE SEQUENCE #{quote_identifier(name)} start with #{opts [:start_with]||1} increment by #{opts[:increment_by]||1} nomaxvalue"
end
def create_table_from_generator(name, generator, options)
drop_statement, create_statements = create_table_sql_list(name, generator, options)
(execute_ddl(drop_statement) rescue nil) if drop_statement
create_statements.each{|sql| execute_ddl(sql)}
end
def create_table_sql_list(name, generator, options=OPTS)
statements = [create_table_sql(name, generator, options)]
drop_seq_statement = nil
generator.columns.each do |c|
if c[:auto_increment]
c[:sequence_name] ||= default_sequence_name(name, c[:name])
unless c[:create_sequence] == false
drop_seq_statement = drop_sequence_sql(c[:sequence_name])
statements << create_sequence_sql(c[:sequence_name], c)
end
unless c[:create_trigger] == false
c[:trigger_name] ||= "BI_#{name}_#{c[:name]}"
trigger_definition = <<-end_sql
BEGIN
IF :NEW.#{quote_identifier(c[:name])} IS NULL THEN
SELECT #{c[:sequence_name]}.nextval INTO :NEW.#{quote_identifier(c[:name])} FROM dual;
END IF;
END;
end_sql
statements << create_trigger_sql(name, c[:trigger_name], trigger_definition, {:events => [:insert]})
end
end
end
[drop_seq_statement, statements]
end
def create_trigger_sql(table, name, definition, opts=OPTS)
events = opts[:events] ? Array(opts[:events]) : [:insert, :update, :delete]
sql = <<-end_sql
CREATE#{' OR REPLACE' if opts[:replace]} TRIGGER #{quote_identifier(name)}
#{opts[:after] ? 'AFTER' : 'BEFORE'} #{events.map{|e| e.to_s.upcase}.join(' OR ')} ON #{quote_schema_table(table)}
REFERENCING NEW AS NEW FOR EACH ROW
#{definition}
end_sql
sql
end
DATABASE_ERROR_REGEXPS = {
/unique constraint .+ violated/ => UniqueConstraintViolation,
/integrity constraint .+ violated/ => ForeignKeyConstraintViolation,
/check constraint .+ violated/ => CheckConstraintViolation,
/cannot insert NULL into|cannot update .+ to NULL/ => NotNullConstraintViolation,
/can't serialize access for this transaction/ => SerializationFailure,
}.freeze
def database_error_regexps
DATABASE_ERROR_REGEXPS
end
def default_sequence_name(table, column)
"seq_#{table}_#{column}"
end
def drop_sequence_sql(name)
"DROP SEQUENCE #{quote_identifier(name)}"
end
def remove_cached_schema(table)
@primary_key_sequences.delete(table)
super
end
TRANSACTION_ISOLATION_LEVELS = {:uncommitted=>'READ COMMITTED'.freeze,
:committed=>'READ COMMITTED'.freeze,
:repeatable=>'SERIALIZABLE'.freeze,
:serializable=>'SERIALIZABLE'.freeze}
# Oracle doesn't support READ UNCOMMITTED OR REPEATABLE READ transaction
# isolation levels, so upgrade to the next highest level in those cases.
def set_transaction_isolation_sql(level)
"SET TRANSACTION ISOLATION LEVEL #{TRANSACTION_ISOLATION_LEVELS[level]}"
end
def sequence_for_table(table)
return nil unless autosequence
@primary_key_sequences.fetch(table) do |key|
pk = schema(table).select{|k, v| v[:primary_key]}
@primary_key_sequences[table] = if pk.length == 1
seq = "seq_#{table}_#{pk.first.first}"
seq.to_sym unless from(:user_sequences).filter(:sequence_name=>input_identifier_meth.call(seq)).empty?
end
end
end
# Oracle supports CREATE OR REPLACE VIEW.
def supports_create_or_replace_view?
true
end
# Oracle's integer/:number type handles larger values than
# most other databases's bigint types, so it should be
# safe to use for Bignum.
def type_literal_generic_bignum(column)
:integer
end
# Oracle doesn't have a time type, so use timestamp for all
# time columns.
def type_literal_generic_time(column)
:timestamp
end
# Oracle doesn't have a boolean type or even a reasonable
# facsimile. Using a char(1) seems to be the recommended way.
def type_literal_generic_trueclass(column)
:'char(1)'
end
# SQL fragment for showing a table is temporary
def temporary_table_sql
TEMPORARY
end
# Oracle uses clob for text types.
def uses_clob_for_text?
true
end
# Oracle supports views with check option, but not local.
def view_with_check_option_support
true
end
end
module DatasetMethods
ROW_NUMBER_EXPRESSION = LiteralString.new('ROWNUM').freeze
SPACE = Dataset::SPACE
APOS = Dataset::APOS
APOS_RE = Dataset::APOS_RE
DOUBLE_APOS = Dataset::DOUBLE_APOS
FROM = Dataset::FROM
TIMESTAMP_FORMAT = "TIMESTAMP '%Y-%m-%d %H:%M:%S%N %z'".freeze
TIMESTAMP_OFFSET_FORMAT = "%+03i:%02i".freeze
BOOL_FALSE = "'N'".freeze
BOOL_TRUE = "'Y'".freeze
HSTAR = "H*".freeze
DUAL = ' FROM DUAL'.freeze
BITAND_PROC = lambda{|a, b| Sequel.lit(["CAST(BITAND(", ", ", ") AS INTEGER)"], a, b)}
include(Module.new do
Dataset.def_sql_method(self, :select, %w'with select distinct columns from join where group having compounds order lock')
end)
def complex_expression_sql_append(sql, op, args)
case op
when :&
complex_expression_arg_pairs_append(sql, args, &BITAND_PROC)
when :|
complex_expression_arg_pairs_append(sql, args){|a, b| Sequel.lit(["(", " - ", " + ", ")"], a, complex_expression_arg_pairs([a, b], &BITAND_PROC), b)}
when :^
complex_expression_arg_pairs_append(sql, args) do |*x|
s1 = complex_expression_arg_pairs(x){|a, b| Sequel.lit(["(", " - ", " + ", ")"], a, complex_expression_arg_pairs([a, b], &BITAND_PROC), b)}
s2 = complex_expression_arg_pairs(x, &BITAND_PROC)
Sequel.lit(["(", " - ", ")"], s1, s2)
end
when :%, :<<, :>>, :'B~'
complex_expression_emulate_append(sql, op, args)
else
super
end
end
# Oracle doesn't support CURRENT_TIME, as it doesn't have
# a type for storing just time values without a date, so
# use CURRENT_TIMESTAMP in its place.
def constant_sql_append(sql, c)
if c == :CURRENT_TIME
super(sql, :CURRENT_TIMESTAMP)
else
super
end
end
# Oracle uses MINUS instead of EXCEPT, and doesn't support EXCEPT ALL
def except(dataset, opts=OPTS)
raise(Sequel::Error, "EXCEPT ALL not supported") if opts[:all]
compound_clone(:minus, dataset, opts)
end
# Use a custom expression with EXISTS to determine whether a dataset
# is empty.
def empty?
db[:dual].where(@opts[:offset] ? exists : unordered.exists).get(1) == nil
end
# Oracle requires SQL standard datetimes
def requires_sql_standard_datetimes?
true
end
# Create a copy of this dataset associated to the given sequence name,
# which will be used when calling insert to find the most recently
# inserted value for the sequence.
def sequence(s)
clone(:sequence=>s)
end
# Handle LIMIT by using a unlimited subselect filtered with ROWNUM.
def select_sql
return super if @opts[:sql]
if o = @opts[:offset]
columns = clone(:append_sql=>'', :placeholder_literal_null=>true).columns
dsa1 = dataset_alias(1)
rn = row_number_column
limit = @opts[:limit]
ds = unlimited.
from_self(:alias=>dsa1).
select_append(ROW_NUMBER_EXPRESSION.as(rn)).
from_self(:alias=>dsa1).
select(*columns).
where(SQL::Identifier.new(rn) > o)
ds = ds.where(SQL::Identifier.new(rn) <= Sequel.+(o, limit)) if limit
sql = @opts[:append_sql] || ''
subselect_sql_append(sql, ds)
sql
elsif limit = @opts[:limit]
ds = clone(:limit=>nil)
# Lock doesn't work in subselects, so don't use a subselect when locking.
# Don't use a subselect if custom SQL is used, as it breaks somethings.
ds = ds.from_self unless @opts[:lock]
sql = @opts[:append_sql] || ''
subselect_sql_append(sql, ds.where(SQL::ComplexExpression.new(:<=, ROW_NUMBER_EXPRESSION, limit)))
sql
else
super
end
end
# Oracle requires recursive CTEs to have column aliases.
def recursive_cte_requires_column_aliases?
true
end
def supports_cte?(type=:select)
type == :select
end
# Oracle does not support derived column lists
def supports_derived_column_lists?
false
end
# Oracle supports GROUP BY CUBE
def supports_group_cube?
true
end
# Oracle supports GROUP BY ROLLUP
def supports_group_rollup?
true
end
# Oracle does not support INTERSECT ALL or EXCEPT ALL
def supports_intersect_except_all?
false
end
# Oracle does not support IS TRUE.
def supports_is_true?
false
end
# Oracle does not support limits in correlated subqueries.
def supports_limits_in_correlated_subqueries?
false
end
# Oracle does not support offsets in correlated subqueries.
def supports_offsets_in_correlated_subqueries?
false
end
# Oracle does not support SELECT *, column
def supports_select_all_and_column?
false
end
# Oracle supports timezones in literal timestamps.
def supports_timestamp_timezones?
true
end
# Oracle does not support WHERE 'Y' for WHERE TRUE.
def supports_where_true?
false
end
# Oracle supports window functions
def supports_window_functions?
true
end
private
# Oracle doesn't support the use of AS when aliasing a dataset. It doesn't require
# the use of AS anywhere, so this disables it in all cases.
def as_sql_append(sql, aliaz, column_aliases=nil)
raise Error, "oracle does not support derived column lists" if column_aliases
sql << SPACE
quote_identifier_append(sql, aliaz)
end
# The strftime format to use when literalizing the time.
def default_timestamp_format
TIMESTAMP_FORMAT
end
def empty_from_sql
DUAL
end
# There is no function on Microsoft SQL Server that does character length
# and respects trailing spaces (datalength respects trailing spaces, but
# counts bytes instead of characters). Use a hack to work around the
# trailing spaces issue.
def emulate_function?(name)
name == :char_length
end
# Oracle treats empty strings like NULL values, and doesn't support
# char_length, so make char_length use length with a nonempty string.
# Unfortunately, as Oracle treats the empty string as NULL, there is
# no way to get trim to return an empty string instead of nil if
# the string only contains spaces.
def emulate_function_sql_append(sql, f)
if f.name == :char_length
literal_append(sql, Sequel::SQL::Function.new(:length, Sequel.join([f.args.first, 'x'])) - 1)
end
end
# If this dataset is associated with a sequence, return the most recently
# inserted sequence value.
def execute_insert(sql, opts=OPTS)
f = @opts[:from]
super(sql, {:table=>(f.first if f), :sequence=>@opts[:sequence]}.merge(opts))
end
# Use a colon for the timestamp offset, since Oracle appears to require it.
def format_timestamp_offset(hour, minute)
sprintf(TIMESTAMP_OFFSET_FORMAT, hour, minute)
end
# Oracle doesn't support empty values when inserting.
def insert_supports_empty_values?
false
end
# Use string in hex format for blob data.
def literal_blob_append(sql, v)
sql << APOS << v.unpack(HSTAR).first << APOS
end
# Oracle uses 'N' for false values.
def literal_false
BOOL_FALSE
end
# Oracle uses the SQL standard of only doubling ' inside strings.
def literal_string_append(sql, v)
sql << APOS << v.gsub(APOS_RE, DOUBLE_APOS) << APOS
end
# Oracle uses 'Y' for true values.
def literal_true
BOOL_TRUE
end
# Oracle can insert multiple rows using a UNION
def multi_insert_sql_strategy
:union
end
# Oracle supports quoted function names.
def supports_quoted_function_names?
true
end
end
end
end
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