### Home Classes Methods

### In Files

- lib/sequel/adapters/shared/postgres.rb

### Namespace

- MODULE Sequel::Postgres::DatasetMethods::PreparedStatementMethods

### Methods

- ::extended
- ::included
- #analyze
- #disable_insert_returning
- #explain
- #for_share
- #full_text_search
- #insert
- #insert_returning_sql
- #insert_select
- #lock
- #multi_insert_sql
- #supports_distinct_on?
- #supports_modifying_joins?
- #supports_timestamp_timezones?
- #supports_window_functions?
- #window

### Files

- CHANGELOG
- COPYING
- README.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- cheat_sheet.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- migration.rdoc
- model_hooks.rdoc
- opening_databases.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
- 3.2.0.txt
- 3.3.0.txt
- 3.4.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- sharding.rdoc
- sql.rdoc
- virtual_rows.rdoc

### Class/Module Index

Quicksearch

- Sequel
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- Sequel::Postgres::DatasetMethods::PreparedStatementMethods
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- Sequel::SQL::CastMethods
- Sequel::SQL::ColumnAll
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- Sequel::SQL::ComplexExpressionMethods
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- String
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- PGconn
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No matching classes.

# Sequel::Postgres::DatasetMethods

Instance methods for datasets that connect to a PostgreSQL database.

### Constants

ACCESS_EXCLUSIVE
ACCESS_SHARE
BOOL_FALSE
BOOL_TRUE
COMMA_SEPARATOR
DELETE_CLAUSE_METHODS
EXCLUSIVE
EXPLAIN
EXPLAIN_ANALYZE
FOR_SHARE
LOCK
NULL
PG_TIMESTAMP_FORMAT
QUERY_PLAN
ROW_EXCLUSIVE
ROW_SHARE
SELECT_CLAUSE_METHODS
SELECT_CLAUSE_METHODS_84
SHARE
SHARE_ROW_EXCLUSIVE
SHARE_UPDATE_EXCLUSIVE
SQL_WITH_RECURSIVE
UPDATE_CLAUSE_METHODS

### Public Class Methods

extended(obj) click to toggle source

Add the disable_insert_returning! mutation method

    # File lib/sequel/adapters/shared/postgres.rb, line 616
    def self.extended(obj)
      obj.def_mutation_method(:disable_insert_returning)
    end

included(mod) click to toggle source

Add the disable_insert_returning! mutation method

    # File lib/sequel/adapters/shared/postgres.rb, line 621
    def self.included(mod)
      mod.def_mutation_method(:disable_insert_returning)
    end

### Public Instance Methods

analyze() click to toggle source

Return the results of an ANALYZE query as a string

    # File lib/sequel/adapters/shared/postgres.rb, line 626
    def analyze
      explain(:analyze=>true)
    end

disable_insert_returning() click to toggle source

Disable the use of INSERT RETURNING, even if the server supports it

    # File lib/sequel/adapters/shared/postgres.rb, line 631
    def disable_insert_returning
      clone(:disable_insert_returning=>true)
    end

explain(opts={}) click to toggle source

Return the results of an EXPLAIN query as a string

    # File lib/sequel/adapters/shared/postgres.rb, line 636
    def explain(opts={})
      with_sql((opts[:analyze] ? EXPLAIN_ANALYZE : EXPLAIN) + select_sql).map(QUERY_PLAN).join("\r\n")
    end

for_share() click to toggle source

Return a cloned dataset which will use FOR SHARE to lock returned rows.

    # File lib/sequel/adapters/shared/postgres.rb, line 641
    def for_share
      lock_style(:share)
    end

full_text_search(cols, terms, opts = {}) click to toggle source

PostgreSQL specific full text search syntax, using tsearch2 (included in 8.3 by default, and available for earlier versions as an add-on).

    # File lib/sequel/adapters/shared/postgres.rb, line 647
    def full_text_search(cols, terms, opts = {})
      lang = opts[:language] || 'simple'
      filter("to_tsvector(#{literal(lang)}, #{full_text_string_join(cols)}) @@ to_tsquery(#{literal(lang)}, #{literal(Array(terms).join(' | '))})")
    end

insert(*values) click to toggle source

Insert given values into the database.

    # File lib/sequel/adapters/shared/postgres.rb, line 653
    def insert(*values)
      if @opts[:sql]
        execute_insert(insert_sql(*values))
      elsif @opts[:disable_insert_returning] || server_version < 80200
        execute_insert(insert_sql(*values), :table=>opts[:from].first, :values=>values.size == 1 ? values.first : values)
      else
        clone(default_server_opts(:sql=>insert_returning_pk_sql(*values))).single_value
      end
    end

insert_returning_sql(returning, *values) click to toggle source

Use the RETURNING clause to return the columns listed in returning.

    # File lib/sequel/adapters/shared/postgres.rb, line 664
    def insert_returning_sql(returning, *values)
      "#{insert_sql(*values)} RETURNING #{column_list(Array(returning))}"
    end

insert_select(*values) click to toggle source

Insert a record returning the record inserted

    # File lib/sequel/adapters/shared/postgres.rb, line 669
    def insert_select(*values)
      return if opts[:disable_insert_returning] || server_version < 80200
      naked.clone(default_server_opts(:sql=>insert_returning_sql(nil, *values))).single_record
    end

lock(mode, opts={}) click to toggle source

Locks all tables in the dataset’s FROM clause (but not in JOINs) with the specified mode (e.g. ‘EXCLUSIVE’). If a block is given, starts a new transaction, locks the table, and yields. If a block is not given just locks the tables. Note that PostgreSQL will probably raise an error if you lock the table outside of an existing transaction. Returns nil.

    # File lib/sequel/adapters/shared/postgres.rb, line 679
    def lock(mode, opts={})
      if block_given? # perform locking inside a transaction and yield to block
        @db.transaction(opts){lock(mode, opts); yield}
      else
        @db.execute(LOCK % [source_list(@opts[:from]), mode], opts) # lock without a transaction
      end
      nil
    end

multi_insert_sql(columns, values) click to toggle source

For PostgreSQL version > 8.2, allow inserting multiple rows at once.

    # File lib/sequel/adapters/shared/postgres.rb, line 689
    def multi_insert_sql(columns, values)
      return super if server_version < 80200

      # postgresql 8.2 introduces support for multi-row insert
      [insert_sql(columns, LiteralString.new('VALUES ' + values.map {|r| literal(Array(r))}.join(COMMA_SEPARATOR)))]
    end

supports_distinct_on?() click to toggle source

DISTINCT ON is a PostgreSQL extension

    # File lib/sequel/adapters/shared/postgres.rb, line 697
    def supports_distinct_on?
      true
    end

supports_modifying_joins?() click to toggle source

PostgreSQL supports modifying joined datasets

    # File lib/sequel/adapters/shared/postgres.rb, line 702
    def supports_modifying_joins?
      true
    end

supports_timestamp_timezones?() click to toggle source

PostgreSQL supports timezones in literal timestamps

    # File lib/sequel/adapters/shared/postgres.rb, line 707
    def supports_timestamp_timezones?
      true
    end

supports_window_functions?() click to toggle source

PostgreSQL 8.4+ supports window functions

    # File lib/sequel/adapters/shared/postgres.rb, line 712
    def supports_window_functions?
      server_version >= 80400
    end

window(name, opts) click to toggle source

Return a clone of the dataset with an addition named window that can be referenced in window functions.

    # File lib/sequel/adapters/shared/postgres.rb, line 717
    def window(name, opts)
      clone(:window=>(@opts[:window]||[]) + [[name, SQL::Window.new(opts)]])
    end

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