Module Sequel
In: lib/sequel/database.rb
lib/sequel/database/misc.rb
lib/sequel/database/schema_methods.rb
lib/sequel/database/schema_generator.rb
lib/sequel/database/dataset.rb
lib/sequel/database/dataset_defaults.rb
lib/sequel/database/logging.rb
lib/sequel/database/connecting.rb
lib/sequel/database/query.rb
lib/sequel/database/transactions.rb
lib/sequel/database/features.rb
lib/sequel/dataset.rb
lib/sequel/timezones.rb
lib/sequel/deprecated.rb
lib/sequel/plugins/instance_hooks.rb
lib/sequel/plugins/association_proxies.rb
lib/sequel/plugins/serialization.rb
lib/sequel/plugins/constraint_validations.rb
lib/sequel/plugins/boolean_subsets.rb
lib/sequel/plugins/optimistic_locking.rb
lib/sequel/plugins/static_cache.rb
lib/sequel/plugins/dataset_associations.rb
lib/sequel/plugins/column_select.rb
lib/sequel/plugins/unlimited_update.rb
lib/sequel/plugins/insert_returning_select.rb
lib/sequel/plugins/subset_conditions.rb
lib/sequel/plugins/list.rb
lib/sequel/plugins/pg_row.rb
lib/sequel/plugins/association_pks.rb
lib/sequel/plugins/string_stripper.rb
lib/sequel/plugins/columns_updated.rb
lib/sequel/plugins/auto_validations.rb
lib/sequel/plugins/update_or_create.rb
lib/sequel/plugins/caching.rb
lib/sequel/plugins/tree.rb
lib/sequel/plugins/uuid.rb
lib/sequel/plugins/serialization_modification_detection.rb
lib/sequel/plugins/error_splitter.rb
lib/sequel/plugins/validation_contexts.rb
lib/sequel/plugins/input_transformer.rb
lib/sequel/plugins/typecast_on_load.rb
lib/sequel/plugins/defaults_setter.rb
lib/sequel/plugins/finder.rb
lib/sequel/plugins/single_table_inheritance.rb
lib/sequel/plugins/column_conflicts.rb
lib/sequel/plugins/rcte_tree.rb
lib/sequel/plugins/nested_attributes.rb
lib/sequel/plugins/before_after_save.rb
lib/sequel/plugins/association_dependencies.rb
lib/sequel/plugins/timestamps.rb
lib/sequel/plugins/table_select.rb
lib/sequel/plugins/modification_detection.rb
lib/sequel/plugins/composition.rb
lib/sequel/plugins/json_serializer.rb
lib/sequel/plugins/boolean_readers.rb
lib/sequel/plugins/update_refresh.rb
lib/sequel/plugins/tactical_eager_loading.rb
lib/sequel/plugins/hook_class_methods.rb
lib/sequel/plugins/split_values.rb
lib/sequel/plugins/prepared_statements.rb
lib/sequel/plugins/validation_helpers.rb
lib/sequel/plugins/singular_table_names.rb
lib/sequel/plugins/after_initialize.rb
lib/sequel/plugins/xml_serializer.rb
lib/sequel/plugins/delay_add_association.rb
lib/sequel/plugins/inverted_subsets.rb
lib/sequel/plugins/prepared_statements_safe.rb
lib/sequel/plugins/instance_filters.rb
lib/sequel/plugins/blacklist_security.rb
lib/sequel/plugins/def_dataset_method.rb
lib/sequel/plugins/active_model.rb
lib/sequel/plugins/validation_class_methods.rb
lib/sequel/plugins/pg_array_associations.rb
lib/sequel/plugins/class_table_inheritance.rb
lib/sequel/plugins/many_through_many.rb
lib/sequel/plugins/whitelist_security.rb
lib/sequel/plugins/skip_create_refresh.rb
lib/sequel/plugins/force_encoding.rb
lib/sequel/plugins/lazy_attributes.rb
lib/sequel/plugins/validate_associated.rb
lib/sequel/plugins/pg_auto_constraint_validations.rb
lib/sequel/plugins/accessed_columns.rb
lib/sequel/plugins/touch.rb
lib/sequel/plugins/dirty.rb
lib/sequel/plugins/eager_each.rb
lib/sequel/plugins/subclasses.rb
lib/sequel/plugins/sharding.rb
lib/sequel/plugins/csv_serializer.rb
lib/sequel/plugins/mssql_optimistic_locking.rb
lib/sequel/plugins/update_primary_key.rb
lib/sequel/extensions/pg_extended_date_support.rb
lib/sequel/extensions/virtual_row_method_block.rb
lib/sequel/extensions/pg_enum.rb
lib/sequel/extensions/pg_static_cache_updater.rb
lib/sequel/extensions/constraint_validations.rb
lib/sequel/extensions/connection_expiration.rb
lib/sequel/extensions/columns_introspection.rb
lib/sequel/extensions/implicit_subquery.rb
lib/sequel/extensions/pg_array.rb
lib/sequel/extensions/pg_row.rb
lib/sequel/extensions/graph_each.rb
lib/sequel/extensions/looser_typecasting.rb
lib/sequel/extensions/eval_inspect.rb
lib/sequel/extensions/empty_array_consider_nulls.rb
lib/sequel/extensions/pg_interval.rb
lib/sequel/extensions/select_remove.rb
lib/sequel/extensions/pg_array_ops.rb
lib/sequel/extensions/_model_pg_row.rb
lib/sequel/extensions/arbitrary_servers.rb
lib/sequel/extensions/pg_json_ops.rb
lib/sequel/extensions/pg_loose_count.rb
lib/sequel/extensions/server_logging.rb
lib/sequel/extensions/to_dot.rb
lib/sequel/extensions/pg_inet_ops.rb
lib/sequel/extensions/synchronize_sql.rb
lib/sequel/extensions/sequel_4_dataset_methods.rb
lib/sequel/extensions/thread_local_timezones.rb
lib/sequel/extensions/named_timezones.rb
lib/sequel/extensions/null_dataset.rb
lib/sequel/extensions/pg_timestamptz.rb
lib/sequel/extensions/server_block.rb
lib/sequel/extensions/_pretty_table.rb
lib/sequel/extensions/schema_caching.rb
lib/sequel/extensions/mssql_emulate_lateral_with_apply.rb
lib/sequel/extensions/migration.rb
lib/sequel/extensions/pg_range_ops.rb
lib/sequel/extensions/duplicate_columns_handler.rb
lib/sequel/extensions/pg_json.rb
lib/sequel/extensions/current_datetime_timestamp.rb
lib/sequel/extensions/string_agg.rb
lib/sequel/extensions/auto_literal_strings.rb
lib/sequel/extensions/query.rb
lib/sequel/extensions/date_arithmetic.rb
lib/sequel/extensions/pagination.rb
lib/sequel/extensions/pg_hstore_ops.rb
lib/sequel/extensions/pg_range.rb
lib/sequel/extensions/pretty_table.rb
lib/sequel/extensions/integer64.rb
lib/sequel/extensions/_model_constraint_validations.rb
lib/sequel/extensions/round_timestamps.rb
lib/sequel/extensions/pg_row_ops.rb
lib/sequel/extensions/connection_validator.rb
lib/sequel/extensions/schema_dumper.rb
lib/sequel/extensions/pg_inet.rb
lib/sequel/extensions/sql_comments.rb
lib/sequel/extensions/error_sql.rb
lib/sequel/extensions/pg_hstore.rb
lib/sequel/extensions/identifier_mangling.rb
lib/sequel/extensions/index_caching.rb
lib/sequel/extensions/escaped_like.rb
lib/sequel/extensions/dataset_source_alias.rb
lib/sequel/extensions/split_array_nil.rb
lib/sequel/ast_transformer.rb
lib/sequel/adapters/sqlite.rb
lib/sequel/adapters/ado.rb
lib/sequel/adapters/mysql2.rb
lib/sequel/adapters/tinytds.rb
lib/sequel/adapters/postgres.rb
lib/sequel/adapters/jdbc.rb
lib/sequel/adapters/odbc/mssql.rb
lib/sequel/adapters/mysql.rb
lib/sequel/adapters/odbc.rb
lib/sequel/adapters/jdbc/sqlite.rb
lib/sequel/adapters/jdbc/jtds.rb
lib/sequel/adapters/jdbc/hsqldb.rb
lib/sequel/adapters/jdbc/sqlserver.rb
lib/sequel/adapters/jdbc/db2.rb
lib/sequel/adapters/jdbc/mysql.rb
lib/sequel/adapters/jdbc/sqlanywhere.rb
lib/sequel/adapters/jdbc/derby.rb
lib/sequel/adapters/jdbc/oracle.rb
lib/sequel/adapters/jdbc/postgresql.rb
lib/sequel/adapters/jdbc/transactions.rb
lib/sequel/adapters/jdbc/h2.rb
lib/sequel/adapters/jdbc/mssql.rb
lib/sequel/adapters/sqlanywhere.rb
lib/sequel/adapters/mock.rb
lib/sequel/adapters/utils/stored_procedures.rb
lib/sequel/adapters/utils/unmodified_identifiers.rb
lib/sequel/adapters/utils/emulate_offset_with_row_number.rb
lib/sequel/adapters/utils/mysql_mysql2.rb
lib/sequel/adapters/utils/mysql_prepared_statements.rb
lib/sequel/adapters/utils/emulate_offset_with_reverse_and_count.rb
lib/sequel/adapters/utils/replace.rb
lib/sequel/adapters/shared/sqlite.rb
lib/sequel/adapters/shared/postgres.rb
lib/sequel/adapters/shared/db2.rb
lib/sequel/adapters/shared/mysql.rb
lib/sequel/adapters/shared/sqlanywhere.rb
lib/sequel/adapters/shared/access.rb
lib/sequel/adapters/shared/oracle.rb
lib/sequel/adapters/shared/mssql.rb
lib/sequel/adapters/oracle.rb
lib/sequel/adapters/ibmdb.rb
lib/sequel/adapters/ado/access.rb
lib/sequel/adapters/ado/mssql.rb
lib/sequel/adapters/amalgalite.rb
lib/sequel/sql.rb
lib/sequel/model.rb
lib/sequel/core.rb
lib/sequel/exceptions.rb
lib/sequel/dataset/misc.rb
lib/sequel/dataset/actions.rb
lib/sequel/dataset/dataset_module.rb
lib/sequel/dataset/prepared_statements.rb
lib/sequel/dataset/sql.rb
lib/sequel/dataset/placeholder_literalizer.rb
lib/sequel/dataset/graph.rb
lib/sequel/dataset/query.rb
lib/sequel/dataset/features.rb
lib/sequel/version.rb
lib/sequel/model/base.rb
lib/sequel/model/dataset_module.rb
lib/sequel/model/errors.rb
lib/sequel/model/default_inflections.rb
lib/sequel/model/plugins.rb
lib/sequel/model/exceptions.rb
lib/sequel/model/associations.rb
lib/sequel/model/inflections.rb

frozen-string-literal: true

Methods

Classes and Modules

Module Sequel::ADO
Module Sequel::Access
Module Sequel::Amalgalite
Module Sequel::ArbitraryServers
Module Sequel::ColumnsIntrospection
Module Sequel::ConnectionExpiration
Module Sequel::ConnectionValidator
Module Sequel::ConstraintValidations
Module Sequel::CoreRefinements
Module Sequel::CurrentDateTimeTimestamp
Module Sequel::DB2
Module Sequel::DatabaseMethods
Module Sequel::DatabaseQuery
Module Sequel::DatasetMethods
Module Sequel::DatasetPagination
Module Sequel::DatasetPrinter
Module Sequel::DatasetQuery
Module Sequel::DateTimeParseToTime
Module Sequel::Deprecation
Module Sequel::DuplicateColumnsHandler
Module Sequel::EmptyArrayConsiderNulls
Module Sequel::EmulateOffsetWithReverseAndCount
Module Sequel::EmulateOffsetWithRowNumber
Module Sequel::ErrorSQL
Module Sequel::EvalInspect
Module Sequel::GraphEach
Module Sequel::IBMDB
Module Sequel::IdentifierMangling
Module Sequel::IndexCaching
Module Sequel::Inflections
Module Sequel::Integer64
Module Sequel::JDBC
Module Sequel::LooserTypecasting
Module Sequel::MSSQL
Module Sequel::Mock
Module Sequel::MockAdapterDatabaseMethods
Module Sequel::MySQL
Module Sequel::Mysql2
Module Sequel::NamedTimezones
Module Sequel::ODBC
Module Sequel::Oracle
Module Sequel::Plugins
Module Sequel::Postgres
Module Sequel::PrettyTable
Module Sequel::S
Module Sequel::SQL
Module Sequel::SQLComments
Module Sequel::SQLite
Module Sequel::Schema
Module Sequel::SchemaCaching
Module Sequel::SchemaDumper
Module Sequel::SelectRemove
Module Sequel::Sequel4DatasetMethods
Module Sequel::ServerBlock
Module Sequel::ServerLogging
Module Sequel::SqlAnywhere
Module Sequel::SymbolAref
Module Sequel::SymbolAs
Module Sequel::ThreadLocalTimezones
Module Sequel::ThreadedServerBlock
Module Sequel::Timezones
Module Sequel::TinyTDS
Module Sequel::UnmodifiedIdentifiers
Module Sequel::UnthreadedServerBlock
Class Sequel::ASTTransformer
Class Sequel::AlterTableGenerator
Class Sequel::BasicObject
Class Sequel::ConnectionPool
Class Sequel::CreateTableGenerator
Class Sequel::Database
Class Sequel::DatabaseError
Class Sequel::Dataset
Class Sequel::DuplicateColumnError
Class Sequel::Error
Class Sequel::ExclusionConstraintViolation
Class Sequel::HookFailed
Class Sequel::IntegerMigrator
Class Sequel::LiteralString
Class Sequel::Migration
Class Sequel::MigrationAlterTableReverser
Class Sequel::MigrationDSL
Class Sequel::MigrationReverser
Class Sequel::Migrator
Class Sequel::Model
Class Sequel::NoMatchingRow
Class Sequel::Qualifier
Class Sequel::SQLTime
Class Sequel::ShardedSingleConnectionPool
Class Sequel::ShardedThreadedConnectionPool
Class Sequel::SimpleMigration
Class Sequel::SingleConnectionPool
Class Sequel::ThreadedConnectionPool
Class Sequel::TimestampMigrator
Class Sequel::ToDot
Class Sequel::ValidationFailed

Constants

ADAPTER_MAP = {}   Hash of adapters that have been used. The key is the adapter scheme symbol, and the value is the Database subclass.
SHARED_ADAPTER_MAP = {}   Hash of shared adapters that have been registered. The key is the adapter scheme symbol, and the value is the Sequel module containing the shared adapter.
DATABASES = []   Array of all databases to which Sequel has connected. If you are developing an application that can connect to an arbitrary number of databases, delete the database objects from this (or use the :keep_reference Database option or a block when connecting) or they will not get garbage collected.
MYSQL_TYPES = {}   Hash with integer keys and callable values for converting MySQL types.
CONVERSION_PROCS = {}
VIRTUAL_ROW = new
OPTS = {}.freeze   Frozen hash used as the default options hash for most options.
SPLIT_SYMBOL_CACHE = {}
AdapterNotFound = Class.new(Error)   Error raised when the adapter requested doesn‘t exist or can‘t be loaded.
DatabaseError = Class.new(Error)   Generic error raised by the database adapters, indicating a problem originating from the database server. Usually raised because incorrect SQL syntax is used.
DatabaseConnectionError = Class.new(DatabaseError)   Error raised when the Sequel is unable to connect to the database with the connection parameters it was given.
DatabaseDisconnectError = Class.new(DatabaseError)   Error raised by adapters when they determine that the connection to the database has been lost. Instructs the connection pool code to remove that connection from the pool so that other connections can be acquired automatically.
ConstraintViolation = Class.new(DatabaseError)   Generic error raised when Sequel determines a database constraint has been violated.
CheckConstraintViolation = Class.new(ConstraintViolation)   Error raised when Sequel determines a database check constraint has been violated.
ForeignKeyConstraintViolation = Class.new(ConstraintViolation)   Error raised when Sequel determines a database foreign key constraint has been violated.
NotNullConstraintViolation = Class.new(ConstraintViolation)   Error raised when Sequel determines a database NOT NULL constraint has been violated.
UniqueConstraintViolation = Class.new(ConstraintViolation)   Error raised when Sequel determines a database unique constraint has been violated.
SerializationFailure = Class.new(DatabaseError)   Error raised when Sequel determines a serialization failure/deadlock in the database.
DatabaseLockTimeout = Class.new(DatabaseError)   Error raised when Sequel determines the database could not acquire a necessary lock before timing out. Use of Dataset#nowait can often cause this exception when retrieving rows.
InvalidOperation = Class.new(Error)   Error raised on an invalid operation, such as trying to update or delete a joined or grouped dataset when the database does not support that.
InvalidValue = Class.new(Error)   Error raised when attempting an invalid type conversion.
PoolTimeout = Class.new(Error)   Error raised when the connection pool cannot acquire a database connection before the timeout.
Rollback = Class.new(Error)   Error that you should raise to signal a rollback of the current transaction. The transaction block will catch this exception, rollback the current transaction, and won‘t reraise it (unless a reraise is requested).
MAJOR = 5   The major version of Sequel. Only bumped for major changes.
MINOR = 9   The minor version of Sequel. Bumped for every non-patch level release, generally around once a month.
TINY = 0   The tiny version of Sequel. Usually 0, only bumped for bugfix releases that fix regressions from previous versions.
VERSION = [MAJOR, MINOR, TINY].join('.').freeze   The version of Sequel you are using, as a string (e.g. "2.11.0")
VERSION_NUMBER = MAJOR*10000 + MINOR*10 + TINY   The version of Sequel you are using, as a number (2.11.0 -> 20110)
DEFAULT_INFLECTIONS_PROC = proc do plural(/$/, 's')   Proc that is instance_execed to create the default inflections for both the model inflector and the inflector extension.
NoExistingObject = Class.new(Error)   Exception class raised when require_modification is set and an UPDATE or DELETE statement to modify the dataset doesn‘t modify a single row.
UndefinedAssociation = Class.new(Error)   Raised when an undefined association is used when eager loading.
MassAssignmentRestriction = Class.new(Error)   Raised when a mass assignment method is called in strict mode with either a restricted column or a column without a setter method.

External Aliases

expr -> []
  Allow nicer syntax for creating Sequel expressions:
  Sequel[1]     # => Sequel::SQL::NumericExpression: 1
  Sequel["a"]   # => Sequel::SQL::StringExpression: 'a'
  Sequel[:a]    # => Sequel::SQL::Identifier: "a"
  Sequel[a: 1]  # => Sequel::SQL::BooleanExpression: ("a" = 1)

Attributes

convert_two_digit_years  [RW]  Sequel converts two digit years in Dates and DateTimes by default, so 01/02/03 is interpreted at January 2nd, 2003, and 12/13/99 is interpreted as December 13, 1999. You can override this to treat those dates as January 2nd, 0003 and December 13, 0099, respectively, by:
  Sequel.convert_two_digit_years = false
datetime_class  [RW]  Sequel can use either Time or DateTime for times returned from the database. It defaults to Time. To change it to DateTime:
  Sequel.datetime_class = DateTime

Note that Time and DateTime objects have a different API, and in cases where they implement the same methods, they often implement them differently (e.g. + using seconds on Time and days on DateTime).

single_threaded  [RW]  Set whether Sequel is being used in single threaded mode. by default, Sequel uses a thread-safe connection pool, which isn‘t as fast as the single threaded connection pool, and also has some additional thread safety checks. If your program will only have one thread, and speed is a priority, you should set this to true:
  Sequel.single_threaded = true

Public Class methods

Returns true if the passed object could be a specifier of conditions, false otherwise. Currently, Sequel considers hashes and arrays of two element arrays as condition specifiers.

  Sequel.condition_specifier?({}) # => true
  Sequel.condition_specifier?([[1, 2]]) # => true
  Sequel.condition_specifier?([]) # => false
  Sequel.condition_specifier?([1]) # => false
  Sequel.condition_specifier?(1) # => false

[Source]

    # File lib/sequel/core.rb, line 72
72:   def self.condition_specifier?(obj)
73:     case obj
74:     when Hash
75:       true
76:     when Array
77:       !obj.empty? && !obj.is_a?(SQL::ValueList) && obj.all?{|i| i.is_a?(Array) && (i.length == 2)}
78:     else
79:       false
80:     end
81:   end

Creates a new database object based on the supplied connection string and optional arguments. The specified scheme determines the database class used, and the rest of the string specifies the connection options. For example:

  DB = Sequel.connect('sqlite:/') # Memory database
  DB = Sequel.connect('sqlite://blog.db') # ./blog.db
  DB = Sequel.connect('sqlite:///blog.db') # /blog.db
  DB = Sequel.connect('postgres://user:password@host:port/database_name')
  DB = Sequel.connect('sqlite:///blog.db', max_connections: 10)

You can also pass a single options hash:

  DB = Sequel.connect(adapter: 'sqlite', database: './blog.db')

If a block is given, it is passed the opened Database object, which is closed when the block exits. For example:

  Sequel.connect('sqlite://blog.db'){|db| puts db[:users].count}

If a block is not given, a reference to this database will be held in Sequel::DATABASES until it is removed manually. This is by design, and used by Sequel::Model to pick the default database. It is recommended to pass a block if you do not want the resulting Database object to remain in memory until the process terminates, or use the keep_reference: false Database option.

For details, see the "Connecting to a Database" guide. To set up a master/slave or sharded database connection, see the "Master/Slave Databases and Sharding" guide.

[Source]

     # File lib/sequel/core.rb, line 115
115:   def self.connect(*args, &block)
116:     Database.connect(*args, &block)
117:   end

Convert the exception to the given class. The given class should be Sequel::Error or a subclass. Returns an instance of klass with the message and backtrace of exception.

[Source]

     # File lib/sequel/core.rb, line 128
128:   def self.convert_exception_class(exception, klass)
129:     return exception if exception.is_a?(klass)
130:     e = klass.new("#{exception.class}: #{exception.message}")
131:     e.wrapped_exception = exception
132:     e.set_backtrace(exception.backtrace)
133:     e
134:   end

Assume the core extensions are not loaded by default, if the core_extensions extension is loaded, this will be overridden.

[Source]

     # File lib/sequel/core.rb, line 121
121:   def self.core_extensions?
122:     false
123:   end

This extension loads the core extensions.

[Source]

    # File lib/sequel/extensions/core_extensions.rb, line 11
11: def Sequel.core_extensions?
12:   true
13: end

The elapsed seconds since the given timer object was created. The timer object should have been created via Sequel.start_timer.

[Source]

     # File lib/sequel/core.rb, line 322
322:   def self.elapsed_seconds_since(timer)
323:     start_timer - timer
324:   end

Load all Sequel extensions given. Extensions are just files that exist under sequel/extensions in the load path, and are just required. In some cases, requiring an extension modifies classes directly, and in others, it just loads a module that you can extend other classes with. Consult the documentation for each extension you plan on using for usage.

  Sequel.extension(:blank)
  Sequel.extension(:core_extensions, :named_timezones)

[Source]

     # File lib/sequel/core.rb, line 144
144:   def self.extension(*extensions)
145:     extensions.each{|e| Kernel.require "sequel/extensions/#{e}"}
146:   end

Yield the Inflections module if a block is given, and return the Inflections module.

[Source]

   # File lib/sequel/model/inflections.rb, line 6
6:   def self.inflections
7:     yield Inflections if block_given?
8:     Inflections
9:   end

The exception classed raised if there is an error parsing JSON. This can be overridden to use an alternative json implementation.

[Source]

     # File lib/sequel/core.rb, line 150
150:   def self.json_parser_error_class
151:     JSON::ParserError
152:   end

The preferred method for writing Sequel migrations, using a DSL:

  Sequel.migration do
    up do
      create_table(:artists) do
        primary_key :id
        String :name
      end
    end

    down do
      drop_table(:artists)
    end
  end

Designed to be used with the Migrator class, part of the migration extension.

[Source]

     # File lib/sequel/extensions/migration.rb, line 288
288:   def self.migration(&block)
289:     MigrationDSL.create(&block)
290:   end

[Source]

    # File lib/sequel/adapters/shared/postgres.rb, line 84
84:     def self.mock_adapter_setup(db)
85:       db.instance_exec do
86:         @server_version = 90500
87:         initialize_postgres_adapter
88:         extend(MockAdapterDatabaseMethods)
89:       end
90:     end

Convert given object to json and return the result. This can be overridden to use an alternative json implementation.

[Source]

     # File lib/sequel/core.rb, line 156
156:   def self.object_to_json(obj, *args, &block)
157:     obj.to_json(*args, &block)
158:   end

Parse the string as JSON and return the result. This can be overridden to use an alternative json implementation.

[Source]

     # File lib/sequel/core.rb, line 162
162:   def self.parse_json(json)
163:     JSON.parse(json, :create_additions=>false)
164:   end

Convert each item in the array to the correct type, handling multi-dimensional arrays. For each element in the array or subarrays, call the converter, unless the value is nil.

[Source]

     # File lib/sequel/core.rb, line 169
169:   def self.recursive_map(array, converter)
170:     array.map do |i|
171:       if i.is_a?(Array)
172:         recursive_map(i, converter)
173:       elsif !i.nil?
174:         converter.call(i)
175:       end
176:     end
177:   end

For backwards compatibility only. require_relative should be used instead.

[Source]

     # File lib/sequel/core.rb, line 180
180:   def self.require(files, subdir=nil)
181:     # Use Kernel.require_relative to work around JRuby 9.0 bug
182:     Array(files).each{|f| Kernel.require_relative "#{"#{subdir}/" if subdir}#{f}"}
183:   end

Splits the symbol into three parts, if symbol splitting is enabled (not the default). Each part will either be a string or nil. If symbol splitting is disabled, returns an array with the first and third parts being nil, and the second part beind a string version of the symbol.

For columns, these parts are the table, column, and alias. For tables, these parts are the schema, table, and alias.

[Source]

     # File lib/sequel/core.rb, line 194
194:   def self.split_symbol(sym)
195:     unless v = Sequel.synchronize{SPLIT_SYMBOL_CACHE[sym]}
196:       if split_symbols?
197:         v = case s = sym.to_s
198:         when /\A((?:(?!__).)+)__((?:(?!___).)+)___(.+)\z/
199:           [$1.freeze, $2.freeze, $3.freeze].freeze
200:         when /\A((?:(?!___).)+)___(.+)\z/
201:           [nil, $1.freeze, $2.freeze].freeze
202:         when /\A((?:(?!__).)+)__(.+)\z/
203:           [$1.freeze, $2.freeze, nil].freeze
204:         else
205:           [nil, s.freeze, nil].freeze
206:         end
207:       else
208:         v = [nil,sym.to_s.freeze,nil].freeze
209:       end
210:       Sequel.synchronize{SPLIT_SYMBOL_CACHE[sym] = v}
211:     end
212:     v
213:   end

Setting this to true enables Sequel‘s historical behavior of splitting symbols on double or triple underscores:

  :table__column         # table.column
  :column___alias        # column AS alias
  :table__column___alias # table.column AS alias

It is only recommended to turn this on for backwards compatibility until such symbols have been converted to use newer Sequel APIs such as:

  Sequel[:table][:column]            # table.column
  Sequel[:column].as(:alias)         # column AS alias
  Sequel[:table][:column].as(:alias) # table.column AS alias

Sequel::Database instances do their own caching of literalized symbols, and changing this setting does not affect those caches. It is recommended that if you want to change this setting, you do so directly after requiring Sequel, before creating any Sequel::Database instances.

Disabling symbol splitting will also disable the handling of double underscores in virtual row methods, causing such methods to yield regular identifers instead of qualified identifiers:

  # Sequel.split_symbols = true
  Sequel.expr{table__column}  # table.column
  Sequel.expr{table[:column]} # table.column

  # Sequel.split_symbols = false
  Sequel.expr{table__column}  # table__column
  Sequel.expr{table[:column]} # table.column

[Source]

     # File lib/sequel/core.rb, line 245
245:   def self.split_symbols=(v)
246:     Sequel.synchronize{SPLIT_SYMBOL_CACHE.clear}
247:     @split_symbols = v
248:   end

Whether Sequel currently splits symbols into qualified/aliased identifiers.

[Source]

     # File lib/sequel/core.rb, line 251
251:   def self.split_symbols?
252:     @split_symbols
253:   end

A timer object that can be passed to Sequel.elapsed_seconds_since to return the number of seconds elapsed.

[Source]

     # File lib/sequel/core.rb, line 309
309:     def self.start_timer
310:       Process.clock_gettime(Process::CLOCK_MONOTONIC)
311:     end

Converts the given string into a Date object.

  Sequel.string_to_date('2010-09-10') # Date.civil(2010, 09, 10)

[Source]

     # File lib/sequel/core.rb, line 258
258:   def self.string_to_date(string)
259:     begin
260:       Date.parse(string, Sequel.convert_two_digit_years)
261:     rescue => e
262:       raise convert_exception_class(e, InvalidValue)
263:     end
264:   end

Converts the given string into a Time or DateTime object, depending on the value of Sequel.datetime_class.

  Sequel.string_to_datetime('2010-09-10 10:20:30') # Time.local(2010, 09, 10, 10, 20, 30)

[Source]

     # File lib/sequel/core.rb, line 270
270:   def self.string_to_datetime(string)
271:     begin
272:       if datetime_class == DateTime
273:         DateTime.parse(string, convert_two_digit_years)
274:       else
275:         datetime_class.parse(string)
276:       end
277:     rescue => e
278:       raise convert_exception_class(e, InvalidValue)
279:     end
280:   end

Converts the given string into a Sequel::SQLTime object.

  v = Sequel.string_to_time('10:20:30') # Sequel::SQLTime.parse('10:20:30')
  DB.literal(v) # => '10:20:30'

[Source]

     # File lib/sequel/core.rb, line 286
286:   def self.string_to_time(string)
287:     begin
288:       SQLTime.parse(string)
289:     rescue => e
290:       raise convert_exception_class(e, InvalidValue)
291:     end
292:   end

Unless in single threaded mode, protects access to any mutable global data structure in Sequel. Uses a non-reentrant mutex, so calling code should be careful. In general, this should only be used around the minimal possible code such as Hash#[], Hash#[]=, Hash#delete, Array#<<, and Array#delete.

[Source]

     # File lib/sequel/core.rb, line 302
302:   def self.synchronize(&block)
303:     @single_threaded ? yield : @data_mutex.synchronize(&block)
304:   end

Uses a transaction on all given databases with the given options. This:

  Sequel.transaction([DB1, DB2, DB3]){}

is equivalent to:

  DB1.transaction do
    DB2.transaction do
      DB3.transaction do
      end
    end
  end

except that if Sequel::Rollback is raised by the block, the transaction is rolled back on all databases instead of just the last one.

Note that this method cannot guarantee that all databases will commit or rollback. For example, if DB3 commits but attempting to commit on DB2 fails (maybe because foreign key checks are deferred), there is no way to uncommit the changes on DB3. For that kind of support, you need to have two-phase commit/prepared transactions (which Sequel supports on some databases).

[Source]

     # File lib/sequel/core.rb, line 348
348:   def self.transaction(dbs, opts=OPTS, &block)
349:     unless opts[:rollback]
350:       rescue_rollback = true
351:       opts = Hash[opts].merge!(:rollback=>:reraise)
352:     end
353:     pr = dbs.reverse.inject(block){|bl, db| proc{db.transaction(opts, &bl)}}
354:     if rescue_rollback
355:       begin
356:         pr.call
357:       rescue Sequel::Rollback
358:         nil
359:       end
360:     else
361:       pr.call
362:     end
363:   end

The version of Sequel you are using, as a string (e.g. "2.11.0")

[Source]

    # File lib/sequel/version.rb, line 20
20:   def self.version
21:     VERSION
22:   end

If the supplied block takes a single argument, yield an SQL::VirtualRow instance to the block argument. Otherwise, evaluate the block in the context of a SQL::VirtualRow instance.

  Sequel.virtual_row{a} # Sequel::SQL::Identifier.new(:a)
  Sequel.virtual_row{|o| o.a} # Sequel::SQL::Function.new(:a)

[Source]

     # File lib/sequel/core.rb, line 372
372:   def self.virtual_row(&block)
373:     vr = VIRTUAL_ROW
374:     case block.arity
375:     when -1, 0
376:       vr.instance_exec(&block)
377:     else
378:       block.call(vr)
379:     end  
380:   end

Public Instance methods

[Source]

     # File lib/sequel/adapters/jdbc.rb, line 725
725:       def fetch_rows(sql, &block)
726:         execute(sql){|result| process_result_set(result, &block)}
727:         self
728:       end

Set whether to convert Java types to ruby types in the returned dataset.

[Source]

     # File lib/sequel/adapters/jdbc.rb, line 736
736:       def with_convert_types(v)
737:         clone(:convert_types=>v)
738:       end

Set the fetch size on JDBC ResultSets created from the returned dataset.

[Source]

     # File lib/sequel/adapters/jdbc.rb, line 731
731:       def with_fetch_size(size)
732:         clone(:fetch_size=>size)
733:       end

[Validate]