Module: Sequel::Postgres::DatasetMethods

### Home Classes Methods

### In Files

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

### Namespace

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

### Methods

- #_import
- #analyze
- #complex_expression_sql_append
- #explain
- #for_share
- #full_text_search
- #insert
- #insert_select
- #lock
- #multi_insert_sql
- #supports_cte_in_subqueries?
- #supports_distinct_on?
- #supports_lateral_subqueries?
- #supports_modifying_joins?
- #supports_regexp?
- #supports_returning?
- #supports_timestamp_timezones?
- #supports_window_functions?
- #truncate
- #window

### 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::ManyThroughMany::ClassMethods
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- Sequel::Plugins::ManyThroughMany::ManyThroughManyAssociationReflection
- Sequel::Plugins::ManyToOnePkLookup
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- Sequel::Plugins::PgArrayAssociations::ManyToPgArrayAssociationReflection
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- Sequel::Plugins::PgRow::ClassMethods
- Sequel::Plugins::PgRow::DatabaseMethods
- Sequel::Plugins::PgRow::InstanceMethods
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- Sequel::Plugins::PreparedStatements::ClassMethods
- Sequel::Plugins::PreparedStatements::InstanceMethods
- Sequel::Plugins::PreparedStatementsAssociations
- Sequel::Plugins::PreparedStatementsAssociations::ClassMethods
- Sequel::Plugins::PreparedStatementsAssociations::InstanceMethods
- Sequel::Plugins::PreparedStatementsSafe
- Sequel::Plugins::PreparedStatementsSafe::ClassMethods
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- 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
- Sequel::SQL
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- Sequel::SQL::AliasedExpression
- Sequel::SQL::BitwiseMethods
- Sequel::SQL::Blob
- Sequel::SQL::BooleanConstant
- Sequel::SQL::BooleanExpression
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- Sequel::SQL::Builders
- Sequel::SQL::CaseExpression
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- Sequel::SQL::CastMethods
- Sequel::SQL::ColumnAll
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- Sequel::SQL::Constant
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- Sequel::SQL::DateAdd
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- Sequel::SQL::DelayedEvaluation
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- Sequel::SQL::Expression
- Sequel::SQL::Function
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- Sequel::SQL::InequalityMethods
- Sequel::SQL::JoinClause
- Sequel::SQL::JoinOnClause
- Sequel::SQL::JoinUsingClause
- Sequel::SQL::NegativeBooleanConstant
- Sequel::SQL::NumericExpression
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- Sequel::SQL::OperatorBuilders
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- Sequel::SQL::PlaceholderLiteralString
- Sequel::SQL::QualifiedIdentifier
- Sequel::SQL::QualifyingMethods
- Sequel::SQL::StringConcatenationMethods
- Sequel::SQL::StringExpression
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- Sequel::SQL::Subscript
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- Sequel::SQL::ValueList
- Sequel::SQL::VirtualRow
- Sequel::SQL::Window
- Sequel::SQL::WindowFunction
- Sequel::SQL::Wrapper
- Sequel::SQLTime
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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
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- 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
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- Sequel::Swift::MySQL::Dataset
- Sequel::Swift::Postgres
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- Sequel::ThreadLocalTimezones
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- Sequel::TinyTDS::Database
- Sequel::TinyTDS::Dataset
- Sequel::TinyTDS::Dataset::ArgumentMapper
- Sequel::TinyTDS::Dataset::PreparedStatementMethods
- Sequel::ToDot
- Sequel::ToDot::DatasetMethods
- Sequel::UnbindDuplicate
- Sequel::Unbinder
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- Sequel::UnthreadedServerBlock
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- String
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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
APOS
APOS_RE
AS
BACKSLASH
BLOB_RE
BOOL_FALSE
BOOL_TRUE
COMMA
COMMA_SEPARATOR
CRLF
DELETE_CLAUSE_METHODS
DELETE_CLAUSE_METHODS_91
DOUBLE_APOS
EMPTY_STRING
ESCAPE
EXCLUSIVE
EXPLAIN
EXPLAIN_ANALYZE
FOR_SHARE
FROM
INSERT_CLAUSE_METHODS
INSERT_CLAUSE_METHODS_91
LOCK_MODES
NULL
PAREN_CLOSE
PAREN_OPEN
PG_TIMESTAMP_FORMAT
QUERY_PLAN
ROW_EXCLUSIVE
ROW_SHARE
SELECT_CLAUSE_METHODS
SELECT_CLAUSE_METHODS_84
SHARE
SHARE_ROW_EXCLUSIVE
SHARE_UPDATE_EXCLUSIVE
SPACE
SQL_WITH_RECURSIVE
UPDATE_CLAUSE_METHODS
UPDATE_CLAUSE_METHODS_91
WINDOW
XOR_OP

### Public Instance Methods

analyze() click to toggle source

Return the results of an EXPLAIN ANALYZE query as a string

    # File lib/sequel/adapters/shared/postgres.rb, line 1156
    def analyze
      explain(:analyze=>true)
    end

complex_expression_sql_append(sql, op, args) click to toggle source

Handle converting the ruby xor operator (^) into the PostgreSQL xor operator (#), and use the ILIKE and NOT ILIKE operators.

    # File lib/sequel/adapters/shared/postgres.rb, line 1163
    def complex_expression_sql_append(sql, op, args)
      case op
      when :^
        j = XOR_OP
        c = false
        args.each do |a|
          sql << j if c
          literal_append(sql, a)
          c ||= true
        end
      when :ILIKE, :'NOT ILIKE'
        sql << PAREN_OPEN
        literal_append(sql, args.at(0))
        sql << SPACE << op.to_s << SPACE
        literal_append(sql, args.at(1))
        sql << ESCAPE
        literal_append(sql, BACKSLASH)
        sql << PAREN_CLOSE
      else
        super
      end
    end

explain(opts=OPTS) click to toggle source

Return the results of an EXPLAIN query as a string

    # File lib/sequel/adapters/shared/postgres.rb, line 1187
    def explain(opts=OPTS)
      with_sql((opts[:analyze] ? EXPLAIN_ANALYZE : EXPLAIN) + select_sql).map(QUERY_PLAN).join(CRLF)
    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 1192
    def for_share
      lock_style(:share)
    end

full_text_search(cols, terms, opts = 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 1198
    def full_text_search(cols, terms, opts = OPTS)
      lang = opts[:language] || 'simple'
      terms = terms.join(' | ') if terms.is_a?(Array)
      filter("to_tsvector(?::regconfig, ?) @@ to_tsquery(?::regconfig, ?)", lang, full_text_string_join(cols), lang, terms)
    end

insert(*values) click to toggle source

Insert given values into the database.

    # File lib/sequel/adapters/shared/postgres.rb, line 1205
    def insert(*values)
      if @opts[:returning]
        # already know which columns to return, let the standard code
        # handle it
        super
      elsif @opts[:sql]
        # raw SQL used, so don't know which table is being inserted
        # into, and therefore can't determine primary key.  Run the
        # insert statement and return nil.
        super
        nil
      else
        # Force the use of RETURNING with the primary key value.
        returning(insert_pk).insert(*values){|r| return r.values.first}
      end
    end

insert_select(*values) click to toggle source

Insert a record returning the record inserted

    # File lib/sequel/adapters/shared/postgres.rb, line 1223
    def insert_select(*values)
      returning.insert(*values){|r| return r}
    end

lock(mode, opts=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 1232
    def lock(mode, opts=OPTS)
      if block_given? # perform locking inside a transaction and yield to block
        @db.transaction(opts){lock(mode, opts); yield}
      else
        sql = 'LOCK TABLE '
        source_list_append(sql, @opts[:from])
        mode = mode.to_s.upcase.strip
        unless LOCK_MODES.include?(mode)
          raise Error, "Unsupported lock mode: #{mode}"
        end
        sql << " IN #{mode} MODE"
        @db.execute(sql, opts)
      end
      nil
    end

multi_insert_sql(columns, values) click to toggle source

PostgreSQL allows inserting multiple rows at once.

    # File lib/sequel/adapters/shared/postgres.rb, line 1249
    def multi_insert_sql(columns, values)
      sql = LiteralString.new('VALUES ')
      expression_list_append(sql, values.map{|r| Array(r)})
      [insert_sql(columns, sql)]
    end

supports_cte_in_subqueries?() click to toggle source

PostgreSQL supports using the WITH clause in subqueries if it supports using WITH at all (i.e. on PostgreSQL 8.4+).

    # File lib/sequel/adapters/shared/postgres.rb, line 1257
    def supports_cte_in_subqueries?
      supports_cte?
    end

supports_distinct_on?() click to toggle source

DISTINCT ON is a PostgreSQL extension

    # File lib/sequel/adapters/shared/postgres.rb, line 1262
    def supports_distinct_on?
      true
    end

supports_lateral_subqueries?() click to toggle source

PostgreSQL 9.3rc1+ supports lateral subqueries

    # File lib/sequel/adapters/shared/postgres.rb, line 1267
    def supports_lateral_subqueries?
      server_version >= 90300
    end

supports_modifying_joins?() click to toggle source

PostgreSQL supports modifying joined datasets

    # File lib/sequel/adapters/shared/postgres.rb, line 1272
    def supports_modifying_joins?
      true
    end

supports_regexp?() click to toggle source

PostgreSQL supports pattern matching via regular expressions

    # File lib/sequel/adapters/shared/postgres.rb, line 1282
    def supports_regexp?
      true
    end

supports_returning?(type) click to toggle source

Returning is always supported.

    # File lib/sequel/adapters/shared/postgres.rb, line 1277
    def supports_returning?(type)
      true
    end

supports_timestamp_timezones?() click to toggle source

PostgreSQL supports timezones in literal timestamps

    # File lib/sequel/adapters/shared/postgres.rb, line 1287
    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 1292
    def supports_window_functions?
      server_version >= 80400
    end

truncate(opts = OPTS) click to toggle source

Truncates the dataset. Returns nil.

Options:

:cascade | whether to use the CASCADE option, useful when truncating

    tables with Foreign Keys.

:only | truncate using ONLY, so child tables are unaffected
:restart | use RESTART IDENTITY to restart any related sequences

:only and :restart only work correctly on PostgreSQL 8.4+.

Usage:

    DB[:table].truncate # TRUNCATE TABLE "table"
    # => nil
    DB[:table].truncate(:cascade => true, :only=>true, :restart=>true) # TRUNCATE TABLE ONLY "table" RESTART IDENTITY CASCADE
    # => nil

    # File lib/sequel/adapters/shared/postgres.rb, line 1311
    def truncate(opts = OPTS)
      if opts.empty?
        super()
      else
        clone(:truncate_opts=>opts).truncate
      end
    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 1320
    def window(name, opts)
      clone(:window=>(@opts[:window]||[]) + [[name, SQL::Window.new(opts)]])
    end

### Protected Instance Methods

_import(columns, values, opts=OPTS) click to toggle source

If returned primary keys are requested, use RETURNING unless already set on the dataset. If RETURNING is already set, use existing returning values. If RETURNING is only set to return a single columns, return an array of just that column. Otherwise, return an array of hashes.

    # File lib/sequel/adapters/shared/postgres.rb, line 1330
    def _import(columns, values, opts=OPTS)
      if @opts[:returning]
        statements = multi_insert_sql(columns, values)
        @db.transaction(opts.merge(:server=>@opts[:server])) do
          statements.map{|st| returning_fetch_rows(st)}
        end.first.map{|v| v.length == 1 ? v.values.first : v}
      elsif opts[:return] == :primary_key
        returning(insert_pk)._import(columns, values, opts)
      else
        super
      end
    end

[Validate]

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