Module | Sequel

In:

lib/sequel/dataset/query.rb
lib/sequel/dataset/mutation.rb
lib/sequel/dataset/sql.rb
lib/sequel/dataset/misc.rb
lib/sequel/dataset/features.rb
lib/sequel/dataset/actions.rb
lib/sequel/dataset/prepared_statements.rb
lib/sequel/dataset/graph.rb
lib/sequel/metaprogramming.rb
lib/sequel/dataset.rb
lib/sequel/database/misc.rb
lib/sequel/database/dataset_defaults.rb
lib/sequel/database/logging.rb
lib/sequel/database/dataset.rb
lib/sequel/database/schema_methods.rb
lib/sequel/database/query.rb
lib/sequel/database/schema_generator.rb
lib/sequel/database/connecting.rb
lib/sequel/plugins/class_table_inheritance.rb
lib/sequel/plugins/rcte_tree.rb
lib/sequel/plugins/schema.rb
lib/sequel/plugins/many_through_many.rb
lib/sequel/plugins/xml_serializer.rb
lib/sequel/plugins/static_cache.rb
lib/sequel/plugins/eager_each.rb
lib/sequel/plugins/defaults_setter.rb
lib/sequel/plugins/association_dependencies.rb
lib/sequel/plugins/caching.rb
lib/sequel/plugins/prepared_statements_with_pk.rb
lib/sequel/plugins/association_autoreloading.rb
lib/sequel/plugins/association_pks.rb
lib/sequel/plugins/boolean_readers.rb
lib/sequel/plugins/prepared_statements.rb
lib/sequel/plugins/validation_class_methods.rb
lib/sequel/plugins/identity_map.rb
lib/sequel/plugins/pg_row.rb
lib/sequel/plugins/timestamps.rb
lib/sequel/plugins/pg_typecast_on_load.rb
lib/sequel/plugins/prepared_statements_associations.rb
lib/sequel/plugins/lazy_attributes.rb
lib/sequel/plugins/update_primary_key.rb
lib/sequel/plugins/optimistic_locking.rb
lib/sequel/plugins/dirty.rb
lib/sequel/plugins/nested_attributes.rb
lib/sequel/plugins/typecast_on_load.rb
lib/sequel/plugins/list.rb
lib/sequel/plugins/instance_filters.rb
lib/sequel/plugins/touch.rb
lib/sequel/plugins/serialization_modification_detection.rb
lib/sequel/plugins/serialization.rb
lib/sequel/plugins/tactical_eager_loading.rb
lib/sequel/plugins/json_serializer.rb
lib/sequel/plugins/prepared_statements_safe.rb
lib/sequel/plugins/association_proxies.rb
lib/sequel/plugins/hook_class_methods.rb
lib/sequel/plugins/sharding.rb
lib/sequel/plugins/instance_hooks.rb
lib/sequel/plugins/active_model.rb
lib/sequel/plugins/single_table_inheritance.rb
lib/sequel/plugins/composition.rb
lib/sequel/plugins/dataset_associations.rb
lib/sequel/plugins/subclasses.rb
lib/sequel/plugins/force_encoding.rb
lib/sequel/plugins/string_stripper.rb
lib/sequel/plugins/validation_helpers.rb
lib/sequel/plugins/tree.rb
lib/sequel/plugins/skip_create_refresh.rb
lib/sequel/plugins/many_to_one_pk_lookup.rb
lib/sequel/ast_transformer.rb
lib/sequel/exceptions.rb
lib/sequel/sql.rb
lib/sequel/database.rb
lib/sequel/model.rb
lib/sequel/version.rb
lib/sequel/core.rb
lib/sequel/extensions/arbitrary_servers.rb
lib/sequel/extensions/_pretty_table.rb
lib/sequel/extensions/select_remove.rb
lib/sequel/extensions/to_dot.rb
lib/sequel/extensions/pg_auto_parameterize.rb
lib/sequel/extensions/query.rb
lib/sequel/extensions/looser_typecasting.rb
lib/sequel/extensions/columns_introspection.rb
lib/sequel/extensions/thread_local_timezones.rb
lib/sequel/extensions/pg_row.rb
lib/sequel/extensions/pg_hstore_ops.rb
lib/sequel/extensions/pg_array.rb
lib/sequel/extensions/pg_statement_cache.rb
lib/sequel/extensions/server_block.rb
lib/sequel/extensions/pg_inet.rb
lib/sequel/extensions/pg_json.rb
lib/sequel/extensions/migration.rb
lib/sequel/extensions/pg_array_ops.rb
lib/sequel/extensions/pretty_table.rb
lib/sequel/extensions/pg_range.rb
lib/sequel/extensions/named_timezones.rb
lib/sequel/extensions/eval_inspect.rb
lib/sequel/extensions/schema_dumper.rb
lib/sequel/extensions/pagination.rb
lib/sequel/extensions/pg_range_ops.rb
lib/sequel/extensions/null_dataset.rb
lib/sequel/extensions/pg_row_ops.rb
lib/sequel/extensions/query_literals.rb
lib/sequel/extensions/pg_interval.rb
lib/sequel/extensions/split_array_nil.rb
lib/sequel/extensions/pg_hstore.rb
lib/sequel/extensions/schema_caching.rb
lib/sequel/model/inflections.rb
lib/sequel/model/exceptions.rb
lib/sequel/model/plugins.rb
lib/sequel/model/errors.rb
lib/sequel/model/associations.rb
lib/sequel/model/base.rb
lib/sequel/model/default_inflections.rb
lib/sequel/adapters/openbase.rb
lib/sequel/adapters/ado.rb
lib/sequel/adapters/jdbc.rb
lib/sequel/adapters/odbc/mssql.rb
lib/sequel/adapters/shared/mysql_prepared_statements.rb
lib/sequel/adapters/shared/informix.rb
lib/sequel/adapters/shared/progress.rb
lib/sequel/adapters/shared/db2.rb
lib/sequel/adapters/shared/sqlite.rb
lib/sequel/adapters/shared/access.rb
lib/sequel/adapters/shared/mysql.rb
lib/sequel/adapters/shared/oracle.rb
lib/sequel/adapters/shared/firebird.rb
lib/sequel/adapters/shared/postgres.rb
lib/sequel/adapters/shared/mssql.rb
lib/sequel/adapters/mysql2.rb
lib/sequel/adapters/tinytds.rb
lib/sequel/adapters/do/sqlite.rb
lib/sequel/adapters/do/postgres.rb
lib/sequel/adapters/do/mysql.rb
lib/sequel/adapters/jdbc/sqlite.rb
lib/sequel/adapters/jdbc/progress.rb
lib/sequel/adapters/jdbc/as400.rb
lib/sequel/adapters/jdbc/transactions.rb
lib/sequel/adapters/jdbc/informix.rb
lib/sequel/adapters/jdbc/mysql.rb
lib/sequel/adapters/jdbc/firebird.rb
lib/sequel/adapters/jdbc/db2.rb
lib/sequel/adapters/jdbc/derby.rb
lib/sequel/adapters/jdbc/postgresql.rb
lib/sequel/adapters/jdbc/hsqldb.rb
lib/sequel/adapters/jdbc/mssql.rb
lib/sequel/adapters/jdbc/oracle.rb
lib/sequel/adapters/jdbc/sqlserver.rb
lib/sequel/adapters/jdbc/h2.rb
lib/sequel/adapters/jdbc/jtds.rb
lib/sequel/adapters/db2.rb
lib/sequel/adapters/utils/pg_types.rb
lib/sequel/adapters/utils/emulate_offset_with_row_number.rb
lib/sequel/adapters/utils/stored_procedures.rb
lib/sequel/adapters/ibmdb.rb
lib/sequel/adapters/do.rb
lib/sequel/adapters/informix.rb
lib/sequel/adapters/dbi.rb
lib/sequel/adapters/mysql.rb
lib/sequel/adapters/oracle.rb
lib/sequel/adapters/ado/mssql.rb
lib/sequel/adapters/swift/postgres.rb
lib/sequel/adapters/swift/sqlite.rb
lib/sequel/adapters/swift/mysql.rb
lib/sequel/adapters/odbc.rb
lib/sequel/adapters/sqlite.rb
lib/sequel/adapters/firebird.rb
lib/sequel/adapters/mock.rb
lib/sequel/adapters/postgres.rb
lib/sequel/adapters/swift.rb
lib/sequel/adapters/amalgalite.rb
lib/sequel/timezones.rb

The schema_caching extension adds a few methods to Sequel::Database that make it easy to dump the parsed schema information to a file, and load it from that file. Loading the schema information from a dumped file is faster than parsing it from the database, so this can save bootup time for applications with large numbers of models.

Basic usage in application code:

      Sequel.extension :schema_caching

      DB = Sequel.connect('...')

      DB.load_schema_cache('/path/to/schema.dump')

      # load model files

Then, whenever the database schema is modified, write a new cached file. You can do that with `bin/sequel`‘s -S option:

      bin/sequel -S /path/to/schema.dump postgres://...

Alternatively, if you don‘t want to dump the schema information for all tables, and you don‘t worry about race conditions, you can choose to use the following in your application code:

      Sequel.extension :schema_caching

      DB = Sequel.connect('...')

      DB.load_schema_cache?('/path/to/schema.dump')

      # load model files

      DB.dump_schema_cache?('/path/to/schema.dump')

With this method, you just have to delete the schema dump file if the schema is modified, and the application will recreate it for you using just the tables that your models use.

Note that it is up to the application to ensure that the dumped cached schema reflects the current state of the database. Sequel does no checking to ensure this, as checking would take time and the purpose of this code is to take a shortcut.

The cached schema is dumped in Marshal format, since it is the fastest and it handles all ruby objects used in the schema hash. Because of this, you should not attempt to load the schema from a untrusted file.

### Methods

Model condition_specifier? connect connect convert_exception_class core_extensions? core_extensions? execute execute_ddl execute_dui execute_insert extension identifier_input_method= identifier_output_method= inflections load_gem migration new quote_identifiers= recursive_map require single_threaded= split_symbol sqls string_to_date string_to_datetime string_to_time supports_savepoints? synchronize synchronize transaction ts_require tsk_require use_iso_date_format= version virtual_row

### Included Modules

SQL::Constants

### Classes and Modules

Module Sequel::ADO
Module Sequel::Access
Module Sequel::Amalgalite
Module Sequel::ArbitraryServers
Module Sequel::ColumnsIntrospection
Module Sequel::DB2
Module Sequel::DBI
Module Sequel::DataObjects
Module Sequel::EmulateOffsetWithRowNumber
Module Sequel::EvalInspect
Module Sequel::Firebird
Module Sequel::IBMDB
Module Sequel::Inflections
Module Sequel::Informix
Module Sequel::JDBC
Module Sequel::LooserTypecasting
Module Sequel::MSSQL
Module Sequel::Metaprogramming
Module Sequel::Mock
Module Sequel::MySQL
Module Sequel::Mysql2
Module Sequel::NamedTimezones
Module Sequel::ODBC
Module Sequel::OpenBase
Module Sequel::Oracle
Module Sequel::Plugins
Module Sequel::Postgres
Module Sequel::PrettyTable
Module Sequel::Progress
Module Sequel::QueryLiterals
Module Sequel::SQL
Module Sequel::SQLite
Module Sequel::Schema
Module Sequel::ServerBlock
Module Sequel::Swift
Module Sequel::ThreadLocalTimezones
Module Sequel::ThreadedServerBlock
Module Sequel::Timezones
Module Sequel::TinyTDS
Module Sequel::UnthreadedServerBlock
Class Sequel::ASTTransformer
Class Sequel::AdapterNotFound
Class Sequel::BasicObject
Class Sequel::ConnectionPool
Class Sequel::Database
Class Sequel::DatabaseConnectionError
Class Sequel::DatabaseDisconnectError
Class Sequel::DatabaseError
Class Sequel::Dataset
Class Sequel::Error
Class Sequel::HookFailed
Class Sequel::IntegerMigrator
Class Sequel::InvalidOperation
Class Sequel::InvalidValue
Class Sequel::LiteralString
Class Sequel::Migration
Class Sequel::MigrationAlterTableReverser
Class Sequel::MigrationDSL
Class Sequel::MigrationReverser
Class Sequel::Migrator
Class Sequel::Model
Class Sequel::NoExistingObject
Class Sequel::NotImplemented
Class Sequel::PoolTimeout
Class Sequel::Qualifier
Class Sequel::Rollback
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::UnbindDuplicate
Class Sequel::Unbinder
Class Sequel::UndefinedAssociation
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.
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 they will not get garbage collected.
MAJOR | = | 3 |  | The major version of Sequel. Only bumped for major changes.
MINOR | = | 38 |  | 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('.') |  | The version of Sequel you are using, as a string (e.g. "2.11.0")
COLUMN_REF_RE1 | = | /\A((?:(?!__).)+)__((?:(?!___).)+)___(.+)\z/.freeze
COLUMN_REF_RE2 | = | /\A((?:(?!___).)+)___(.+)\z/.freeze
COLUMN_REF_RE3 | = | /\A((?:(?!__).)+)__(.+)\z/.freeze
BeforeHookFailed | = | HookFailed |  | Deprecated alias for HookFailed, kept for backwards compatibility
DEFAULT_INFLECTIONS_PROC | = | proc do plural(/$/, 's') |  | Proc that is instance evaled to create the default inflections for both the model inflector and the inflector extension.
STRING_TYPES | = | [18, 19, 25, 1042, 1043] |  | Type OIDs for string types used by PostgreSQL. These types don‘t have conversion procs associated with them (since the data is already in the form of a string).
PG_NAMED_TYPES | = | {} unless defined?(PG_NAMED_TYPES) |  | Hash with type name strings/symbols and callable values for converting PostgreSQL types. Non-builtin types that don‘t have fixed numbers should use this to register conversion procs.
PG_TYPES | = | {} unless defined?(PG_TYPES) |  | Hash with integer keys and callable values for converting PostgreSQL types.
MYSQL_TYPES | = | {} |  | Hash with integer keys and callable values for converting MySQL types.
SQLITE_TYPES | = | {} |  | Hash with string keys and callable values for converting SQLite types.

### External Aliases

require | -> | k_require
| Alias to the standard version of require

### Attributes

autoid

[W]

Set the autogenerated primary key integer to be returned when running an insert query. Argument types supported:

nil : | Return nil for all inserts
Integer : | Starting integer for next insert, with futher inserts getting an incremented value
Array : | First insert gets the first value in the array, second gets the second value, etc.
Proc : | Called with the insert SQL query, uses the value returned
Class : | Should be an Exception subclass, will create a new instance an raise it wrapped in a DatabaseError.

columns

[W]

Set the columns to set in the dataset when the dataset fetches rows. Argument types supported:

nil : | Set no columns

Array of Symbols: Used for all datasets Array (otherwise): First retrieval gets the first value in the

                       array, second gets the second value, etc.

Proc : | Called with the select SQL query, uses the value returned, which should be an array of symbols

convert_invalid_date_time | [RW] | Whether to convert invalid date time values by default. Only applies to Sequel::Database instances created after this has been set.

convert_two_digit_years

[RW]

Sequel converts two digit years in `Date`s and `DateTime`s 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

For ruby versions less than 1.9.2, `Time` has a limited range (1901 to 2038), so if you use datetimes out of that range, you need to switch to `DateTime`. Also, before 1.9.2, `Time` can only handle local and UTC times, not other timezones. 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`).

empty_array_handle_nulls

[RW]

Sets whether or not to attempt to handle NULL values correctly when given an empty array. By default:

      DB[:a].filter(:b=>[])
      # SELECT * FROM a WHERE (b != b)
      DB[:a].exclude(:b=>[])
      # SELECT * FROM a WHERE (b = b)

However, some databases (e.g. MySQL) will perform very poorly with this type of query. You can set this to false to get the following behavior:

      DB[:a].filter(:b=>[])
      # SELECT * FROM a WHERE 1 = 0
      DB[:a].exclude(:b=>[])
      # SELECT * FROM a WHERE 1 = 1

This may not handle NULLs correctly, but can be much faster on some databases.

fetch

[W]

Set the hashes to yield by execute when retrieving rows. Argument types supported:

nil : | Yield no rows
Hash : | Always yield a single row with this hash
Array of Hashes : | Yield separately for each hash in this array
Array (otherwise) : | First retrieval gets the first value in the array, second gets the second value, etc.
Proc : | Called with the select SQL query, uses the value returned, which should be a hash or array of hashes.
Class : | Should be an Exception subclass, will create a new instance an raise it wrapped in a DatabaseError.

numrows

[W]

Set the number of rows to return from update or delete. Argument types supported:

nil : | Return 0 for all updates and deletes
Integer : | Used for all updates and deletes
Array : | First update/delete gets the first value in the array, second gets the second value, etc.
Proc : | Called with the update/delete SQL query, uses the value returned.
Class : | Should be an Exception subclass, will create a new instance an raise it wrapped in a DatabaseError.

server_version | [RW] | Mock the server version, useful when using the shared adapters
use_iso_date_format | [R] | As an optimization, Sequel sets the date style to ISO, so that PostgreSQL provides the date in a known format that Sequel can parse faster. This can be turned off if you require a date style other than ISO.
virtual_row_instance_eval | [RW] | For backwards compatibility, has no effect.

### Public Class methods

Model(source)

Lets you create a Model subclass with its dataset already set. `source` should be an instance of one of the following classes:

Database : | Sets the database for this model to `source`. Generally only useful when subclassing directly from the returned class, where the name of the subclass sets the table name (which is combined with the `Database` in `source` to create the dataset to use)
Dataset : | Sets the dataset for this model to `source`.
other : | Sets the table name for this model to `source`. The class will use the default database for model classes in order to create the dataset.

The purpose of this method is to set the dataset/database automatically for a model class, if the table name doesn‘t match the implicit name. This is neater than using set_dataset inside the class, doesn‘t require a bogus query for the schema.

      # Using a symbol
      class Comment < Sequel::Model(:something)
        table_name # => :something
      end

      # Using a dataset
      class Comment < Sequel::Model(DB1[:something])
        dataset # => DB1[:something]
      end

      # Using a database
      class Comment < Sequel::Model(DB1)
        dataset # => DB1[:comments]
      end

[Source]

        # File lib/sequel/model.rb, line 37
    37:   def self.Model(source)
    38:     if Sequel::Model.cache_anonymous_models && (klass = Sequel.synchronize{Model::ANONYMOUS_MODEL_CLASSES[source]})
    39:       return klass
    40:     end
    41:     klass = if source.is_a?(Database)
    42:       c = Class.new(Model)
    43:       c.db = source
    44:       c
    45:     else
    46:       Class.new(Model).set_dataset(source)
    47:     end
    48:     Sequel.synchronize{Model::ANONYMOUS_MODEL_CLASSES[source] = klass} if Sequel::Model.cache_anonymous_models
    49:     klass
    50:   end

condition_specifier?(obj)

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 117
    117:   def self.condition_specifier?(obj)
    118:     case obj
    119:     when Hash
    120:       true
    121:     when Array
    122:       !obj.empty? && !obj.is_a?(SQL::ValueList) && obj.all?{|i| (Array === i) && (i.length == 2)}
    123:     else
    124:       false
    125:     end
    126:   end

connect(*args, &block)

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)

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}

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 146
    146:   def self.connect(*args, &block)
    147:     Database.connect(*args, &block)
    148:   end

convert_exception_class(exception, klass)

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 159
    159:   def self.convert_exception_class(exception, klass)
    160:     return exception if exception.is_a?(klass)
    161:     e = klass.new("#{exception.class}: #{exception.message}")
    162:     e.wrapped_exception = exception
    163:     e.set_backtrace(exception.backtrace)
    164:     e
    165:   end

core_extensions?()

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 152
    152:   def self.core_extensions?
    153:     false
    154:   end

core_extensions?()

This extension loads the core extensions.

[Source]

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

extension(*extensions)

Load all Sequel extensions given. Extensions are just files that exist under `sequel/extensions` in the load path, and are just required. Generally, extensions modify the behavior of `Database` and/or `Dataset`, but Sequel ships with some extensions that modify other classes that exist for backwards compatibility. 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(:schema_dumper)
      Sequel.extension(:pagination, :query)

[Source]

         # File lib/sequel/core.rb, line 177
    177:   def self.extension(*extensions)
    178:     extensions.each{|e| tsk_require "sequel/extensions/#{e}"}
    179:   end

identifier_input_method=(value)

Set the method to call on identifiers going into the database. This affects the literalization of identifiers by calling this method on them before they are input. Sequel upcases identifiers in all SQL strings for most databases, so to turn that off:

      Sequel.identifier_input_method = nil

to downcase instead:

      Sequel.identifier_input_method = :downcase

Other String instance methods work as well.

[Source]

         # File lib/sequel/core.rb, line 192
    192:   def self.identifier_input_method=(value)
    193:     Database.identifier_input_method = value
    194:   end

identifier_output_method=(value)

Set the method to call on identifiers coming out of the database. This affects the literalization of identifiers by calling this method on them when they are retrieved from the database. Sequel downcases identifiers retrieved for most databases, so to turn that off:

      Sequel.identifier_output_method = nil

to upcase instead:

      Sequel.identifier_output_method = :upcase

Other String instance methods work as well.

[Source]

         # File lib/sequel/core.rb, line 208
    208:   def self.identifier_output_method=(value)
    209:     Database.identifier_output_method = value
    210:   end

inflections() {|Inflections if block_given?| ...}

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

[Source]

       # File lib/sequel/model/inflections.rb, line 4
    4:   def self.inflections
    5:     yield Inflections if block_given?
    6:     Inflections
    7:   end

load_gem(name)

Allowing loading the necessary JDBC support via a gem, which works for PostgreSQL, MySQL, and SQLite.

[Source]

         # File lib/sequel/adapters/jdbc.rb, line 130
    130:     def self.load_gem(name)
    131:       begin
    132:         Sequel.tsk_require "jdbc/#{name}"
    133:       rescue LoadError
    134:         # jdbc gem not used, hopefully the user has the .jar in their CLASSPATH
    135:       end
    136:     end

migration(&block)

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 272
    272:   def self.migration(&block)
    273:     MigrationDSL.create(&block)
    274:   end

new(opts={})

Additional options supported:

:autoid : | Call autoid= with the value
:columns : | Call columns= with the value
:fetch : | Call fetch= with the value
:numrows : | Call numrows= with the value
:extend : | A module the object is extended with.
:sqls : | The array to store the SQL queries in.

[Source]

         # File lib/sequel/adapters/mock.rb, line 132
    132:       def initialize(opts={})
    133:         super
    134:         opts = @opts
    135:         @sqls = opts[:sqls] || []
    136:         if mod_name = SHARED_ADAPTERS[opts[:host]]
    137:           @shared_adapter = true
    138:           require "sequel/adapters/shared/#{opts[:host]}"
    139:           extend Sequel.const_get(mod_name)::DatabaseMethods
    140:           extend_datasets Sequel.const_get(mod_name)::DatasetMethods
    141:           if pr = SHARED_ADAPTER_SETUP[opts[:host]]
    142:             pr.call(self)
    143:           end
    144:         end
    145:         self.autoid = opts[:autoid]
    146:         self.columns = opts[:columns]
    147:         self.fetch = opts[:fetch]
    148:         self.numrows = opts[:numrows]
    149:         extend(opts[:extend]) if opts[:extend]
    150:         sqls
    151:       end

quote_identifiers=(value)

Set whether to quote identifiers for all databases by default. By default, Sequel quotes identifiers in all SQL strings, so to turn that off:

      Sequel.quote_identifiers = false

[Source]

         # File lib/sequel/core.rb, line 216
    216:   def self.quote_identifiers=(value)
    217:     Database.quote_identifiers = value
    218:   end

recursive_map(array, converter)

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 223
    223:   def self.recursive_map(array, converter)
    224:     array.map do |i|
    225:       if i.is_a?(Array)
    226:         recursive_map(i, converter)
    227:       elsif i
    228:         converter.call(i)
    229:       end
    230:     end
    231:   end

require(files, subdir=nil)

Require all given `files` which should be in the same or a subdirectory of this file. If a `subdir` is given, assume all `files` are in that subdir. This is used to ensure that the files loaded are from the same version of Sequel as this file.

[Source]

         # File lib/sequel/core.rb, line 237
    237:   def self.require(files, subdir=nil)
    238:     Array(files).each{|f| super("#{File.dirname(__FILE__).untaint}/#{"#{subdir}/" if subdir}#{f}")}
    239:   end

single_threaded=(value)

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

[Source]

         # File lib/sequel/core.rb, line 248
    248:   def self.single_threaded=(value)
    249:     @single_threaded = value
    250:     Database.single_threaded = value
    251:   end

split_symbol(sym)

Splits the symbol into three parts. Each part will either be a string or nil.

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 262
    262:   def self.split_symbol(sym)
    263:     case s = sym.to_s
    264:     when COLUMN_REF_RE1
    265:       [$1, $2, $3]
    266:     when COLUMN_REF_RE2
    267:       [nil, $1, $2]
    268:     when COLUMN_REF_RE3
    269:       [$1, $2, nil]
    270:     else
    271:       [nil, s, nil]
    272:     end
    273:   end

string_to_date(string)

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 278
    278:   def self.string_to_date(string)
    279:     begin
    280:       Date.parse(string, Sequel.convert_two_digit_years)
    281:     rescue => e
    282:       raise convert_exception_class(e, InvalidValue)
    283:     end
    284:   end

string_to_datetime(string)

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 290
    290:   def self.string_to_datetime(string)
    291:     begin
    292:       if datetime_class == DateTime
    293:         DateTime.parse(string, convert_two_digit_years)
    294:       else
    295:         datetime_class.parse(string)
    296:       end
    297:     rescue => e
    298:       raise convert_exception_class(e, InvalidValue)
    299:     end
    300:   end

string_to_time(string)

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 306
    306:   def self.string_to_time(string)
    307:     begin
    308:       SQLTime.parse(string)
    309:     rescue => e
    310:       raise convert_exception_class(e, InvalidValue)
    311:     end
    312:   end

synchronize() {|| ...}

Yield directly to the block. You don‘t need to synchronize access on MRI because the GVL makes certain methods atomic.

[Source]

         # File lib/sequel/core.rb, line 327
    327:     def self.synchronize(&block)
    328:       yield
    329:     end

synchronize() {|: @data_mutex.synchronize(&block)| ...}

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.

[Source]

         # File lib/sequel/core.rb, line 321
    321:     def self.synchronize(&block)
    322:       @single_threaded ? yield : @data_mutex.synchronize(&block)
    323:     end

transaction(dbs, opts={}, &block)

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 355
    355:   def self.transaction(dbs, opts={}, &block)
    356:     unless opts[:rollback]
    357:       rescue_rollback = true
    358:       opts = opts.merge(:rollback=>:reraise)
    359:     end
    360:     pr = dbs.reverse.inject(block){|bl, db| proc{db.transaction(opts, &bl)}}
    361:     if rescue_rollback
    362:       begin
    363:         pr.call
    364:       rescue Sequel::Rollback => e
    365:         nil
    366:       end
    367:     else
    368:       pr.call
    369:     end
    370:   end

ts_require(*args)

Same as Sequel.require, but wrapped in a mutex in order to be thread safe.

[Source]

         # File lib/sequel/core.rb, line 373
    373:   def self.ts_require(*args)
    374:     check_requiring_thread{require(*args)}
    375:   end

tsk_require(*args)

Same as Kernel.require, but wrapped in a mutex in order to be thread safe.

[Source]

         # File lib/sequel/core.rb, line 378
    378:   def self.tsk_require(*args)
    379:     check_requiring_thread{k_require(*args)}
    380:   end

use_iso_date_format=(v)

Modify the type translator for the date type depending on the value given.

[Source]

        # File lib/sequel/adapters/utils/pg_types.rb, line 75
    75:     def self.use_iso_date_format=(v)
    76:       PG_TYPES[1082] = v ? TYPE_TRANSLATOR.method(:date) : Sequel.method(:string_to_date)
    77:       @use_iso_date_format = v
    78:     end

version()

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

[Source]

        # File lib/sequel/version.rb, line 15
    15:   def self.version
    16:     VERSION
    17:   end

virtual_row(&block)

If the supplied block takes a single argument, yield a new `SQL::VirtualRow` instance to the block argument. Otherwise, evaluate the block in the context of a new `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 389
    389:   def self.virtual_row(&block)
    390:     vr = SQL::VirtualRow.new
    391:     case block.arity
    392:     when -1, 0
    393:       vr.instance_eval(&block)
    394:     else
    395:       block.call(vr)
    396:     end
    397:   end

### Public Instance methods

connect(server)

Return a related Connection option connecting to the given shard.

[Source]

         # File lib/sequel/adapters/mock.rb, line 154
    154:       def connect(server)
    155:         Connection.new(self, server, server_opts(server))
    156:       end

execute(sql, opts={}, &block)

Store the sql used for later retrieval with sqls, and return the appropriate value using either the autoid, fetch, or numrows methods.

[Source]

         # File lib/sequel/adapters/mock.rb, line 161
    161:       def execute(sql, opts={}, &block)
    162:         synchronize(opts[:server]){|c| _execute(c, sql, opts, &block)}
    163:       end

execute_ddl(sql, opts={}, &block)

Alias for execute

execute_dui(sql, opts={})

Store the sql used, and return the value of the numrows method.

[Source]

         # File lib/sequel/adapters/mock.rb, line 167
    167:       def execute_dui(sql, opts={})
    168:         execute(sql, opts.merge(:meth=>:numrows))
    169:       end

execute_insert(sql, opts={})

Store the sql used, and return the value of the autoid method.

[Source]

         # File lib/sequel/adapters/mock.rb, line 172
    172:       def execute_insert(sql, opts={})
    173:         execute(sql, opts.merge(:meth=>:autoid))
    174:       end

sqls()

Return all stored SQL queries, and clear the cache of SQL queries.

[Source]

         # File lib/sequel/adapters/mock.rb, line 178
    178:       def sqls
    179:         s = @sqls.dup
    180:         @sqls.clear
    181:         s
    182:       end

supports_savepoints?()

Enable use of savepoints.

[Source]

         # File lib/sequel/adapters/mock.rb, line 185
    185:       def supports_savepoints?
    186:         shared_adapter? ? super : true
    187:       end

[Validate]