Class: Sequel::Postgres::Database

### Home Classes Methods

### In Files

- lib/sequel/adapters/postgres.rb

### Parent

Sequel::Database

### Methods

- #bound_variable_arg
- #connect
- #convert_infinite_timestamps=
- #copy_into
- #copy_table
- #disconnect_connection
- #error_info
- #execute
- #listen
- #to_application_timestamp

### Included Modules

- Sequel::Postgres::DatabaseMethods

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- bin_sequel.rdoc
- cheat_sheet.rdoc
- code_order.rdoc
- core_extensions.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- extensions.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- model_plugins.rdoc
- object_model.rdoc
- opening_databases.rdoc
- postgresql.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
- 2.11.0.txt
- 2.12.0.txt
- 2.2.0.txt
- 2.3.0.txt
- 2.4.0.txt
- 2.5.0.txt
- 2.6.0.txt
- 2.7.0.txt
- 2.8.0.txt
- 2.9.0.txt
- 3.0.0.txt
- 3.1.0.txt
- 3.10.0.txt
- 3.11.0.txt
- 3.12.0.txt
- 3.13.0.txt
- 3.14.0.txt
- 3.15.0.txt
- 3.16.0.txt
- 3.17.0.txt
- 3.18.0.txt
- 3.19.0.txt
- 3.2.0.txt
- 3.20.0.txt
- 3.21.0.txt
- 3.22.0.txt
- 3.23.0.txt
- 3.24.0.txt
- 3.25.0.txt
- 3.26.0.txt
- 3.27.0.txt
- 3.28.0.txt
- 3.29.0.txt
- 3.3.0.txt
- 3.30.0.txt
- 3.31.0.txt
- 3.32.0.txt
- 3.33.0.txt
- 3.34.0.txt
- 3.35.0.txt
- 3.36.0.txt
- 3.37.0.txt
- 3.38.0.txt
- 3.39.0.txt
- 3.4.0.txt
- 3.40.0.txt
- 3.41.0.txt
- 3.42.0.txt
- 3.43.0.txt
- 3.44.0.txt
- 3.45.0.txt
- 3.46.0.txt
- 3.47.0.txt
- 3.48.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- 4.0.0.txt
- 4.1.0.txt
- 4.2.0.txt
- 4.3.0.txt
- 4.4.0.txt
- 4.5.0.txt
- schema_modification.rdoc
- security.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- thread_safety.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

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- Sequel::Plugins::PgArrayAssociations
- Sequel::Plugins::PgArrayAssociations::ClassMethods
- Sequel::Plugins::PgArrayAssociations::DatasetMethods
- Sequel::Plugins::PgArrayAssociations::ManyToPgArrayAssociationReflection
- Sequel::Plugins::PgArrayAssociations::PgArrayToManyAssociationReflection
- Sequel::Plugins::PgRow
- Sequel::Plugins::PgRow::ClassMethods
- Sequel::Plugins::PgRow::DatabaseMethods
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- Sequel::Plugins::PreparedStatements::InstanceMethods
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- Sequel::Plugins::PreparedStatementsAssociations::ClassMethods
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- Sequel::Plugins::PreparedStatementsSafe::ClassMethods
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- Sequel::Plugins::Sharding::InstanceMethods
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- Sequel::Plugins::SingleTableInheritance::ClassMethods
- Sequel::Plugins::SingleTableInheritance::InstanceMethods
- Sequel::Plugins::SkipCreateRefresh
- Sequel::Plugins::SkipCreateRefresh::InstanceMethods
- Sequel::Plugins::StaticCache
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- Sequel::Plugins::StaticCache::InstanceMethods
- Sequel::Plugins::StringStripper
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- Sequel::Plugins::Subclasses
- Sequel::Plugins::Subclasses::ClassMethods
- Sequel::Plugins::TableSelect
- Sequel::Plugins::TableSelect::ClassMethods
- Sequel::Plugins::TacticalEagerLoading
- Sequel::Plugins::TacticalEagerLoading::DatasetMethods
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- Sequel::Plugins::Timestamps
- Sequel::Plugins::Timestamps::ClassMethods
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- Sequel::Plugins::Touch
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- Sequel::Postgres::Database
- Sequel::Postgres::DatabaseMethods
- Sequel::Postgres::Dataset
- Sequel::Postgres::Dataset::ArgumentMapper
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- Sequel::Postgres::DatasetMethods::PreparedStatementMethods
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- Sequel::Postgres::LooseCount
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- Sequel::Postgres::PGRow::ArrayRow
- Sequel::Postgres::PGRow::DatabaseMethods
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- Sequel::Postgres::PGRow::Parser
- Sequel::Postgres::PGRow::Splitter
- Sequel::Postgres::PGRowOp
- Sequel::Postgres::PGRowOp::ExpressionMethods
- Sequel::Postgres::RangeOp
- Sequel::Postgres::RangeOpMethods
- Sequel::Postgres::StaticCacheUpdater
- Sequel::PrettyTable
- Sequel::Progress
- Sequel::Progress::DatabaseMethods
- Sequel::Progress::DatasetMethods
- Sequel::Qualifier
- Sequel::QueryLiterals
- Sequel::Rollback
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- Sequel::SQL::AliasedExpression
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- Sequel::SQL::CastMethods
- Sequel::SQL::ColumnAll
- Sequel::SQL::ComplexExpression
- Sequel::SQL::ComplexExpressionMethods
- Sequel::SQL::Constant
- Sequel::SQL::Constants
- Sequel::SQL::DateAdd
- Sequel::SQL::DateAdd::DatasetMethods
- Sequel::SQL::DelayedEvaluation
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- Sequel::SQL::Expression
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- Sequel::SQL::JoinClause
- Sequel::SQL::JoinOnClause
- Sequel::SQL::JoinUsingClause
- Sequel::SQL::NegativeBooleanConstant
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- Sequel::SQL::OperatorBuilders
- Sequel::SQL::OrderMethods
- Sequel::SQL::OrderedExpression
- Sequel::SQL::PlaceholderLiteralString
- Sequel::SQL::QualifiedIdentifier
- Sequel::SQL::QualifyingMethods
- Sequel::SQL::StringConcatenationMethods
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- Sequel::SQL::WindowFunction
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- Sequel::SQLite::DatabaseMethods
- Sequel::SQLite::Dataset
- Sequel::SQLite::Dataset::ArgumentMapper
- Sequel::SQLite::Dataset::BindArgumentMethods
- Sequel::SQLite::Dataset::PreparedStatementMethods
- Sequel::SQLite::DatasetMethods
- Sequel::Schema
- Sequel::Schema::AlterTableGenerator
- Sequel::Schema::CreateTableGenerator
- Sequel::Schema::Generator
- Sequel::SchemaCaching
- Sequel::SchemaDumper
- Sequel::SelectRemove
- Sequel::Sequel3DatasetMethods
- Sequel::SerializationFailure
- Sequel::ServerBlock
- Sequel::SetOverrides
- Sequel::ShardedSingleConnectionPool
- Sequel::ShardedThreadedConnectionPool
- Sequel::SimpleMigration
- Sequel::SingleConnectionPool
- Sequel::SqlAnywhere
- Sequel::SqlAnywhere::Database
- Sequel::SqlAnywhere::DatabaseMethods
- Sequel::SqlAnywhere::Dataset
- Sequel::SqlAnywhere::DatasetMethods
- Sequel::SqlAnywhere::SQLAnywhereException
- Sequel::Swift
- Sequel::Swift::Database
- Sequel::Swift::Dataset
- Sequel::Swift::MySQL
- Sequel::Swift::MySQL::DatabaseMethods
- Sequel::Swift::MySQL::Dataset
- Sequel::Swift::Postgres
- Sequel::Swift::Postgres::DatabaseMethods
- Sequel::Swift::SQLite
- Sequel::Swift::SQLite::DatabaseMethods
- Sequel::Swift::SQLite::Dataset
- Sequel::ThreadLocalTimezones
- Sequel::ThreadedConnectionPool
- Sequel::ThreadedServerBlock
- Sequel::TimestampMigrator
- Sequel::Timezones
- Sequel::TinyTDS
- Sequel::TinyTDS::Database
- Sequel::TinyTDS::Dataset
- Sequel::TinyTDS::Dataset::ArgumentMapper
- Sequel::TinyTDS::Dataset::PreparedStatementMethods
- Sequel::ToDot
- Sequel::ToDot::DatasetMethods
- Sequel::UnbindDuplicate
- Sequel::Unbinder
- Sequel::UndefinedAssociation
- Sequel::UniqueConstraintViolation
- Sequel::UnthreadedServerBlock
- Sequel::ValidationFailed
- String
- String::Inflections
- Array
- FalseClass
- Hash
- NilClass
- Numeric
- Object
- PGconn
- PGresult
- Range
- Symbol
- TrueClass

No matching classes.

# Sequel::Postgres::Database

Database class for PostgreSQL databases used with Sequel and the pg, postgres, or postgres-pr driver.

### Constants

INFINITE_DATETIME_VALUES
INFINITE_TIMESTAMP_STRINGS

### Attributes

convert_infinite_timestamps[R]

Whether infinite timestamps/dates should be converted on retrieval. By default, no conversion is done, so an error is raised if you attempt to retrieve an infinite timestamp/date. You can set this to :nil to convert to nil, :string to leave as a string, or :float to convert to an infinite float.

### Public Instance Methods

bound_variable_arg(arg, conn) click to toggle source

Convert given argument so that it can be used directly by pg. Currently, pg doesn't handle fractional seconds in Time/DateTime or blobs with "0", and it won't ever handle Sequel::SQLTime values correctly. Only public for use by the adapter, shouldn't be used by external code.

    # File lib/sequel/adapters/postgres.rb, line 185
    def bound_variable_arg(arg, conn)
      case arg
      when Sequel::SQL::Blob
        conn.escape_bytea(arg)
      when Sequel::SQLTime
        literal(arg)
      when DateTime, Time
        literal(arg)
      else
        arg
      end
    end

connect(server) click to toggle source

Connects to the database. In addition to the standard database options, using the :encoding or :charset option changes the client encoding for the connection, :connect_timeout is a connection timeout in seconds, and :sslmode sets whether postgres's sslmode. :connect_timeout and :ssl_mode are only supported if the pg driver is used.

    # File lib/sequel/adapters/postgres.rb, line 204
    def connect(server)
      opts = server_opts(server)
      conn = if SEQUEL_POSTGRES_USES_PG
        connection_params = {
          :host => opts[:host],
          :port => opts[:port] || 5432,
          :dbname => opts[:database],
          :user => opts[:user],
          :password => opts[:password],
          :connect_timeout => opts[:connect_timeout] || 20,
          :sslmode => opts[:sslmode]
        }.delete_if { |key, value| blank_object?(value) }
        Adapter.connect(connection_params)
      else
        Adapter.connect(
          (opts[:host] unless blank_object?(opts[:host])),
          opts[:port] || 5432,
          nil, '',
          opts[:database],
          opts[:user],
          opts[:password]
        )
      end
      if encoding = opts[:encoding] || opts[:charset]
        if conn.respond_to?(:set_client_encoding)
          conn.set_client_encoding(encoding)
        else
          conn.async_exec("set client_encoding to '#{encoding}'")
        end
      end
      conn.instance_variable_set(:@db, self)
      conn.instance_variable_set(:@prepared_statements, {}) if SEQUEL_POSTGRES_USES_PG
      connection_configuration_sqls.each{|sql| conn.execute(sql)}
      conn
    end

convert_infinite_timestamps=(v) click to toggle source

Set whether to allow infinite timestamps/dates. Make sure the conversion proc for date reflects that setting.

    # File lib/sequel/adapters/postgres.rb, line 242
    def convert_infinite_timestamps=(v)
      @convert_infinite_timestamps = case v
      when Symbol
        v
      when 'nil'
        :nil
      when 'string'
        :string
      when 'float'
        :float
      when String
        typecast_value_boolean(v)
      else
        false
      end

      pr = old_pr = @use_iso_date_format ? TYPE_TRANSLATOR.method(:date) : Sequel.method(:string_to_date)
      if v
        pr = lambda do |val|
          case val
          when *INFINITE_TIMESTAMP_STRINGS
            infinite_timestamp_value(val)
          else
            old_pr.call(val)
          end
        end
      end
      conversion_procs[1082] = pr
    end

copy_into(table, opts=OPTS) click to toggle source

`copy_into` uses PostgreSQL's +COPY FROM STDIN+ SQL statement to do very fast inserts into a table using input preformatting in either CSV or PostgreSQL text format. This method is only supported if pg 0.14.0+ is the underlying ruby driver. This method should only be called if you want results returned to the client. If you are using +COPY FROM+ with a filename, you should just use `run` instead of this method.

The following options are respected:

:columns | The columns to insert into, with the same order as the columns in the input data. If this isn't given, uses all columns in the table.
:data | The data to copy to PostgreSQL, which should already be in CSV or PostgreSQL text format. This can be either a string, or any object that responds to each and yields string.
:format | The format to use. text is the default, so this should be :csv or :binary.
:options | An options SQL string to use, which should contain comma separated options.
:server | The server on which to run the query.

If a block is provided and :data option is not, this will yield to the block repeatedly. The block should return a string, or nil to signal that it is finished.

    # File lib/sequel/adapters/postgres.rb, line 375
    def copy_into(table, opts=OPTS)
      data = opts[:data]
      data = Array(data) if data.is_a?(String)

      if block_given? && data
        raise Error, "Cannot provide both a :data option and a block to copy_into"
      elsif !block_given? && !data
        raise Error, "Must provide either a :data option or a block to copy_into"
      end

      synchronize(opts[:server]) do |conn|
        conn.execute(copy_into_sql(table, opts))
        begin
          if block_given?
            while buf = yield
              conn.put_copy_data(buf)
            end
          else
            data.each{|buff| conn.put_copy_data(buff)}
          end
        rescue Exception => e
          conn.put_copy_end("ruby exception occurred while copying data into PostgreSQL")
        ensure
          conn.put_copy_end unless e
          while res = conn.get_result
            raise e if e
            check_database_errors{res.check}
          end
        end
      end
    end

copy_table(table, opts=OPTS) click to toggle source

`copy_table` uses PostgreSQL's +COPY TO STDOUT+ SQL statement to return formatted results directly to the caller. This method is only supported if pg is the underlying ruby driver. This method should only be called if you want results returned to the client. If you are using +COPY TO+ with a filename, you should just use `run` instead of this method.

The table argument supports the following types:

String | Uses the first argument directly as literal SQL. If you are using a version of PostgreSQL before 9.0, you will probably want to use a string if you are using any options at all, as the syntax Sequel uses for options is only compatible with PostgreSQL 9.0+.
Dataset | Uses a query instead of a table name when copying.
other | Uses a table name (usually a symbol) when copying.

The following options are respected:

:format | The format to use. text is the default, so this should be :csv or :binary.
:options | An options SQL string to use, which should contain comma separated options.
:server | The server on which to run the query.

If a block is provided, the method continually yields to the block, one yield per row. If a block is not provided, a single string is returned with all of the data.

    # File lib/sequel/adapters/postgres.rb, line 335
    def copy_table(table, opts=OPTS)
      synchronize(opts[:server]) do |conn|
        conn.execute(copy_table_sql(table, opts))
        begin
          if block_given?
            while buf = conn.get_copy_data
              yield buf
            end
            nil
          else
            b = ''
            b << buf while buf = conn.get_copy_data
            b
          end
        ensure
          raise DatabaseDisconnectError, "disconnecting as a partial COPY may leave the connection in an unusable state" if buf
        end
      end
    end

disconnect_connection(conn) click to toggle source

Disconnect given connection

    # File lib/sequel/adapters/postgres.rb, line 273
    def disconnect_connection(conn)
      begin
        conn.finish
      rescue PGError, IOError
      end
    end

error_info(e) click to toggle source

Return a hash of information about the related PGError (or Sequel::DatabaseError that wraps a PGError), with the following entries:

:schema | The schema name related to the error
:table | The table name related to the error
:column | the column name related to the error
:constraint | The constraint name related to the error
:type | The datatype name related to the error

This requires a PostgreSQL 9.3+ server and 9.3+ client library, and ruby-pg 0.16.0+ to be supported.

    # File lib/sequel/adapters/postgres.rb, line 292
    def error_info(e)
      e = e.wrapped_exception if e.is_a?(DatabaseError)
      r = e.result
      h = {}
      h[:schema] = r.error_field(::PG::PG_DIAG_SCHEMA_NAME)
      h[:table] = r.error_field(::PG::PG_DIAG_TABLE_NAME)
      h[:column] = r.error_field(::PG::PG_DIAG_COLUMN_NAME)
      h[:constraint] = r.error_field(::PG::PG_DIAG_CONSTRAINT_NAME)
      h[:type] = r.error_field(::PG::PG_DIAG_DATATYPE_NAME)
      h
    end

execute(sql, opts=OPTS, &block) click to toggle source

Execute the given SQL with the given args on an available connection.

    # File lib/sequel/adapters/postgres.rb, line 306
    def execute(sql, opts=OPTS, &block)
      synchronize(opts[:server]){|conn| check_database_errors{_execute(conn, sql, opts, &block)}}
    end

listen(channels, opts=OPTS, &block) click to toggle source

Listens on the given channel (or multiple channels if channel is an array), waiting for notifications. After a notification is received, or the timeout has passed, stops listening to the channel. Options:

:after_listen | An object that responds to `call` that is called with the underlying connection after the LISTEN statement is sent, but before the connection starts waiting for notifications.
:loop | Whether to continually wait for notifications, instead of just waiting for a single notification. If this option is given, a block must be provided. If this object responds to call, it is called with the underlying connection after each notification is received (after the block is called). If a :timeout option is used, and a callable object is given, the object will also be called if the timeout expires. If :loop is used and you want to stop listening, you can either break from inside the block given to listen, or you can throw :stop from inside the :loop object's call method or the block.
:server | The server on which to listen, if the sharding support is being used.
:timeout | How long to wait for a notification, in seconds (can provide a float value for fractional seconds). If not given or nil, waits indefinitely.

This method is only supported if pg is used as the underlying ruby driver. It returns the channel the notification was sent to (as a string), unless :loop was used, in which case it returns nil. If a block is given, it is yielded 3 arguments:

- the channel the notification was sent to (as a string)

- the backend pid of the notifier (as an integer),

- and the payload of the notification (as a string or nil).

    # File lib/sequel/adapters/postgres.rb, line 428
    def listen(channels, opts=OPTS, &block)
      check_database_errors do
        synchronize(opts[:server]) do |conn|
          begin
            channels = Array(channels)
            channels.each do |channel|
              sql = "LISTEN "
              dataset.send(:identifier_append, sql, channel)
              conn.execute(sql)
            end
            opts[:after_listen].call(conn) if opts[:after_listen]
            timeout = opts[:timeout] ? [opts[:timeout]] : []
            if l = opts[:loop]
              raise Error, 'calling #listen with :loop requires a block' unless block
              loop_call = l.respond_to?(:call)
              catch(:stop) do
                loop do
                  conn.wait_for_notify(*timeout, &block)
                  l.call(conn) if loop_call
                end
              end
              nil
            else
              conn.wait_for_notify(*timeout, &block)
            end
          ensure
            conn.execute("UNLISTEN *")
          end
        end
      end
    end

to_application_timestamp(value) click to toggle source

If convert_infinite_timestamps is true and the value is infinite, return an appropriate value based on the convert_infinite_timestamps setting.

    # File lib/sequel/adapters/postgres.rb, line 463
    def to_application_timestamp(value)
      if convert_infinite_timestamps
        case value
        when *INFINITE_TIMESTAMP_STRINGS
          infinite_timestamp_value(value)
        else
          super
        end
      else
        super
      end
    end

[Validate]

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