Module: Sequel

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

Overview

The duplicate_columns_handler extension allows you to customize handling of duplicate column names in your queries on a per-database or per-dataset level.

For example, you may want to raise an exception if you join 2 tables together which contains a column that will override another columns.

To use the extension, you need to load the extension into the database:

DB.extension :duplicate_columns_handler

or into individual datasets:

ds = DB[:items].extension(:duplicate_columns_handler)

A database option is introduced: :on_duplicate_columns. It accepts a Symbol or any object that responds to :call.

on_duplicate_columns: :raise
on_duplicate_columns: :warn
on_duplicate_columns: :ignore
on_duplicate_columns: lambda{|columns| arbitrary_condition? ? :raise : :warn}

You may also configure duplicate columns handling for a specific dataset:

ds.on_duplicate_columns(:warn)
ds.on_duplicate_columns(:raise)
ds.on_duplicate_columns(:ignore)
ds.on_duplicate_columns{|columns| arbitrary_condition? ? :raise : :warn}
ds.on_duplicate_columns(lambda{|columns| arbitrary_condition? ? :raise : :warn})

If :raise is specified, a Sequel::DuplicateColumnError is raised. If :warn is specified, you will receive a warning via warn. If a callable is specified, it will be called. If no on_duplicate_columns is specified, the default is :warn.

Related module: Sequel::DuplicateColumnsHandler

Defined Under Namespace

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

Constant Summary collapse

VIRTUAL_ROW =
new
OPTS =

Frozen hash used as the default options hash for most options.

{}.freeze
SPLIT_SYMBOL_CACHE =
{}
MAJOR =

The major version of Sequel. Only bumped for major changes.

5
MINOR =

The minor version of Sequel. Bumped for every non-patch level release, generally around once a month.

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TINY =

The tiny version of Sequel. Usually 0, only bumped for bugfix releases that fix regressions from previous versions.

0
VERSION =

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

[MAJOR, MINOR, TINY].join('.').freeze
VERSION_NUMBER =

The version of Sequel you are using, as a number (2.11.0 -> 20110)

MAJOR*10000 + MINOR*10 + TINY
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.

[]
Timezones =

Backwards compatible alias

SequelMethods
DEFAULT_INFLECTIONS_PROC =

Proc that is instance_execed to create the default inflections for both the model inflector and the inflector extension.

proc do
  plural(/$/, 's')
  plural(/s$/i, 's')
  plural(/(alias|(?:stat|octop|vir|b)us)$/i, '\1es')
  plural(/(buffal|tomat)o$/i, '\1oes')
  plural(/([ti])um$/i, '\1a')
  plural(/sis$/i, 'ses')
  plural(/(?:([^f])fe|([lr])f)$/i, '\1\2ves')
  plural(/(hive)$/i, '\1s')
  plural(/([^aeiouy]|qu)y$/i, '\1ies')
  plural(/(x|ch|ss|sh)$/i, '\1es')
  plural(/(matr|vert|ind)ix|ex$/i, '\1ices')
  plural(/([m|l])ouse$/i, '\1ice')

  singular(/s$/i, '')
  singular(/([ti])a$/i, '\1um')
  singular(/(analy|ba|cri|diagno|parenthe|progno|synop|the)ses$/i, '\1sis')
  singular(/([^f])ves$/i, '\1fe')
  singular(/([h|t]ive)s$/i, '\1')
  singular(/([lr])ves$/i, '\1f')
  singular(/([^aeiouy]|qu)ies$/i, '\1y')
  singular(/(m)ovies$/i, '\1ovie')
  singular(/(x|ch|ss|sh)es$/i, '\1')
  singular(/([m|l])ice$/i, '\1ouse')
  singular(/buses$/i, 'bus')
  singular(/oes$/i, 'o')
  singular(/shoes$/i, 'shoe')
  singular(/(alias|(?:stat|octop|vir|b)us)es$/i, '\1')
  singular(/(vert|ind)ices$/i, '\1ex')
  singular(/matrices$/i, 'matrix')

  irregular('person', 'people')
  irregular('man', 'men')
  irregular('child', 'children')
  irregular('sex', 'sexes')
  irregular('move', 'moves')
  irregular('quiz', 'quizzes')
  irregular('testis', 'testes')

  uncountable(%w(equipment information rice money species series fish sheep news))
end

Constants included from SQL::Constants

SQL::Constants::CURRENT_DATE, SQL::Constants::CURRENT_TIME, SQL::Constants::CURRENT_TIMESTAMP, SQL::Constants::DEFAULT, SQL::Constants::NOTNULL, SQL::Constants::NULL, SQL::Constants::SQLFALSE, SQL::Constants::SQLTRUE

Instance Attribute Summary

Attributes included from NamedTimezones

#tzinfo_disambiguator

Attributes included from SequelMethods

#application_timezone, #convert_two_digit_years, #database_timezone, #datetime_class, #single_threaded, #typecast_timezone

Class Method Summary collapse

Methods included from FiberConcurrency

current

Methods included from EvalInspect

eval_inspect

Methods included from SequelMethods

application_to_database_timestamp, condition_specifier?, connect, convert_exception_class, convert_output_timestamp, convert_timestamp, core_extensions?, current, database_to_application_timestamp, default_timezone=, elapsed_seconds_since, extension, json_parser_error_class, object_to_json, parse_json, recursive_map, require, split_symbol, split_symbols=, split_symbols?, start_timer, string_to_date, string_to_datetime, string_to_time, synchronize, transaction, typecast_to_application_timestamp, virtual_row

Methods included from SQL::OperatorBuilders

**, ~

Methods included from SQL::Builders

as, asc, blob, case, cast, cast_numeric, cast_string, char_length, date_add, date_sub, deep_qualify, delay, desc, expr, extract, function, hstore, hstore_op, identifier, ilike, join, like, lit, negate, or, pg_array, pg_array_op, pg_inet_op, pg_json, pg_json_op, pg_json_wrap, pg_jsonb, pg_jsonb_op, pg_jsonb_wrap, pg_range, pg_range_op, pg_row, pg_row_op, qualify, string_agg, subscript, trim, value_list

Class Method Details

.core_extensions?Boolean

This extension loads the core extensions.

Returns:

  • (Boolean)

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12
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# File 'lib/sequel/extensions/core_extensions.rb', line 11

def Sequel.core_extensions?
  true
end

.inflections {|Inflections| ... } ⇒ Object

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

Yields:


6
7
8
9
# File 'lib/sequel/model/inflections.rb', line 6

def self.inflections
  yield Inflections if block_given?
  Inflections
end

.migration(&block) ⇒ Object

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.


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# File 'lib/sequel/extensions/migration.rb', line 288

def self.migration(&block)
  MigrationDSL.create(&block)
end

.versionObject

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


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# File 'lib/sequel/version.rb', line 22

def self.version
  VERSION
end