### Home Classes Methods

### In Files

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

### Methods

- #create_function
- #create_language
- #create_trigger
- #database_type
- #drop_function
- #drop_language
- #drop_table
- #drop_trigger
- #indexes
- #locks
- #primary_key
- #primary_key_sequence
- #reset_primary_key_sequence
- #serial_primary_key_options
- #server_version
- #supports_savepoints?
- #table_exists?
- #tables

### 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

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No matching classes.

# Sequel::Postgres::DatabaseMethods

Methods shared by Database instances that connect to PostgreSQL.

### Constants

PREPARED_ARG_PLACEHOLDER
RE_CURRVAL_ERROR
SYSTEM_TABLE_REGEXP

### Public Instance Methods

create_function(name, definition, opts={}) click to toggle source

Creates the function in the database. Arguments:

- name : name of the function to create

- definition : string definition of the function, or object file for a dynamically loaded C function.

- opts : options hash:

  - :args : function arguments, can be either a symbol or string specifying a type or an array of 1-3 elements:

    - element 1 : argument data type

    - element 2 : argument name

    - element 3 : argument mode (e.g. in, out, inout)

  - :behavior : Should be IMMUTABLE, STABLE, or VOLATILE. PostgreSQL assumes VOLATILE by default.

  - :cost : The estimated cost of the function, used by the query planner.

  - :language : The language the function uses. SQL is the default.

  - :link_symbol : For a dynamically loaded see function, the function’s link symbol if different from the definition argument.

  - :returns : The data type returned by the function. If you are using OUT or INOUT argument modes, this is ignored. Otherwise, if this is not specified, void is used by default to specify the function is not supposed to return a value.

  - :rows : The estimated number of rows the function will return. Only use if the function returns SETOF something.

  - :security_definer : Makes the privileges of the function the same as the privileges of the user who defined the function instead of the privileges of the user who runs the function. There are security implications when doing this, see the PostgreSQL documentation.

  - :set : Configuration variables to set while the function is being run, can be a hash or an array of two pairs. search_path is often used here if :security_definer is used.

  - :strict : Makes the function return NULL when any argument is NULL.

    # File lib/sequel/adapters/shared/postgres.rb, line 184
    def create_function(name, definition, opts={})
      self << create_function_sql(name, definition, opts)
    end

create_language(name, opts={}) click to toggle source

Create the procedural language in the database. Arguments:

- name : Name of the procedural language (e.g. plpgsql)

- opts : options hash:

  - :handler : The name of a previously registered function used as a call handler for this language.

  - :trusted : Marks the language being created as trusted, allowing unprivileged users to create functions using this language.

  - :validator : The name of previously registered function used as a validator of functions defined in this language.

    # File lib/sequel/adapters/shared/postgres.rb, line 194
    def create_language(name, opts={})
      self << create_language_sql(name, opts)
    end

create_trigger(table, name, function, opts={}) click to toggle source

Create a trigger in the database. Arguments:

- table : the table on which this trigger operates

- name : the name of this trigger

- function : the function to call for this trigger, which should return type trigger.

- opts : options hash:

  - :after : Calls the trigger after execution instead of before.

  - :args : An argument or array of arguments to pass to the function.

  - :each_row : Calls the trigger for each row instead of for each statement.

  - :events : Can be :insert, :update, :delete, or an array of any of those. Calls the trigger whenever that type of statement is used. By default, the trigger is called for insert, update, or delete.

    # File lib/sequel/adapters/shared/postgres.rb, line 208
    def create_trigger(table, name, function, opts={})
      self << create_trigger_sql(table, name, function, opts)
    end

database_type() click to toggle source

PostgreSQL uses the :postgres database type.

    # File lib/sequel/adapters/shared/postgres.rb, line 213
    def database_type
      :postgres
    end

drop_function(name, opts={}) click to toggle source

Drops the function from the database. Arguments:

- name : name of the function to drop

- opts : options hash:

  - :args : The arguments for the function. See create_function_sql.

  - :cascade : Drop other objects depending on this function.

  - :if_exists : Don’t raise an error if the function doesn’t exist.

    # File lib/sequel/adapters/shared/postgres.rb, line 223
    def drop_function(name, opts={})
      self << drop_function_sql(name, opts)
    end

drop_language(name, opts={}) click to toggle source

Drops a procedural language from the database. Arguments:

- name : name of the procedural language to drop

- opts : options hash:

  - :cascade : Drop other objects depending on this function.

  - :if_exists : Don’t raise an error if the function doesn’t exist.

    # File lib/sequel/adapters/shared/postgres.rb, line 232
    def drop_language(name, opts={})
      self << drop_language_sql(name, opts)
    end

drop_table(*names) click to toggle source

Remove the cached entries for primary keys and sequences when dropping a table.

    # File lib/sequel/adapters/shared/postgres.rb, line 237
    def drop_table(*names)
      names.each do |name|
        name = quote_schema_table(name)
        @primary_keys.delete(name)
        @primary_key_sequences.delete(name)
      end
      super
    end

drop_trigger(table, name, opts={}) click to toggle source

Drops a trigger from the database. Arguments:

- table : table from which to drop the trigger

- name : name of the trigger to drop

- opts : options hash:

  - :cascade : Drop other objects depending on this function.

  - :if_exists : Don’t raise an error if the function doesn’t exist.

    # File lib/sequel/adapters/shared/postgres.rb, line 252
    def drop_trigger(table, name, opts={})
      self << drop_trigger_sql(table, name, opts)
    end

indexes(table, opts={}) click to toggle source

Use the pg_* system tables to determine indexes on a table

    # File lib/sequel/adapters/shared/postgres.rb, line 257
    def indexes(table, opts={})
      m = output_identifier_meth
      im = input_identifier_meth
      schema, table = schema_and_table(table)
      range = 0...32
      attnums = server_version >= 80100 ? SQL::Function.new(:ANY, :ind__indkey) : range.map{|x| SQL::Subscript.new(:ind__indkey, [x])}
      ds = metadata_dataset.
        from(:pg_class___tab).
        join(:pg_index___ind, :indrelid=>:oid, im.call(table)=>:relname).
        join(:pg_class___indc, :oid=>:indexrelid).
        join(:pg_attribute___att, :attrelid=>:tab__oid, :attnum=>attnums).
        filter(:indc__relkind=>'i', :ind__indisprimary=>false, :indexprs=>nil, :indpred=>nil).
        order(:indc__relname, range.map{|x| [SQL::Subscript.new(:ind__indkey, [x]), x]}.case(32, :att__attnum)).
        select(:indc__relname___name, :ind__indisunique___unique, :att__attname___column)

      ds.join!(:pg_namespace___nsp, :oid=>:tab__relnamespace, :nspname=>schema.to_s) if schema
      ds.filter!(:indisvalid=>true) if server_version >= 80200
      ds.filter!(:indisready=>true, :indcheckxmin=>false) if server_version >= 80300

      indexes = {}
      ds.each do |r|
        i = indexes[m.call(r[:name])] ||= {:columns=>[], :unique=>r[:unique]}
        i[:columns] << m.call(r[:column])
      end
      indexes
    end

locks() click to toggle source

Dataset containing all current database locks

    # File lib/sequel/adapters/shared/postgres.rb, line 285
    def locks
      dataset.from(:pg_class).join(:pg_locks, :relation=>:relfilenode).select(:pg_class__relname, Sequel::SQL::ColumnAll.new(:pg_locks))
    end

primary_key(table, opts={}) click to toggle source

Return primary key for the given table.

    # File lib/sequel/adapters/shared/postgres.rb, line 290
    def primary_key(table, opts={})
      quoted_table = quote_schema_table(table)
      return @primary_keys[quoted_table] if @primary_keys.include?(quoted_table)
      @primary_keys[quoted_table] = if conn = opts[:conn]
        conn.primary_key(*schema_and_table(table))
      else
        synchronize(opts[:server]){|con| con.primary_key(*schema_and_table(table))}
      end
    end

primary_key_sequence(table, opts={}) click to toggle source

Return the sequence providing the default for the primary key for the given table.

    # File lib/sequel/adapters/shared/postgres.rb, line 301
    def primary_key_sequence(table, opts={})
      quoted_table = quote_schema_table(table)
      return @primary_key_sequences[quoted_table] if @primary_key_sequences.include?(quoted_table)
      @primary_key_sequences[quoted_table] = if conn = opts[:conn]
        conn.sequence(*schema_and_table(table))
      else
        synchronize(opts[:server]){|con| con.sequence(*schema_and_table(table))}
      end
    end

reset_primary_key_sequence(table) click to toggle source

Reset the primary key sequence for the given table, baseing it on the maximum current value of the table’s primary key.

    # File lib/sequel/adapters/shared/postgres.rb, line 313
    def reset_primary_key_sequence(table)
      pk = SQL::Identifier.new(primary_key(table))
      return unless seq = primary_key_sequence(table)
      db = self
      seq_ds = db.from(seq.lit)
      get{setval(seq, db[table].select{coalesce(max(pk)+seq_ds.select{:increment_by}, seq_ds.select(:min_value))}, false)}
    end

serial_primary_key_options() click to toggle source

PostgreSQL uses SERIAL psuedo-type instead of AUTOINCREMENT for managing incrementing primary keys.

    # File lib/sequel/adapters/shared/postgres.rb, line 323
    def serial_primary_key_options
      {:primary_key => true, :serial => true, :type=>Integer}
    end

server_version(server=nil) click to toggle source

The version of the PostgreSQL server, used for determining capability.

    # File lib/sequel/adapters/shared/postgres.rb, line 328
    def server_version(server=nil)
      return @server_version if @server_version
      @server_version = synchronize(server) do |conn|
        (conn.server_version rescue nil) if conn.respond_to?(:server_version)
      end
      unless @server_version
        m = /PostgreSQL (\d+)\.(\d+)(?:(?:rc\d+)|\.(\d+))?/.match(fetch('SELECT version()').single_value)
        @server_version = (m[1].to_i * 10000) + (m[2].to_i * 100) + m[3].to_i
      end
      @server_version
    end

supports_savepoints?() click to toggle source

PostgreSQL supports savepoints

    # File lib/sequel/adapters/shared/postgres.rb, line 341
    def supports_savepoints?
      true
    end

table_exists?(table, opts={}) click to toggle source

Whether the given table exists in the database

Options:

- :schema - The schema to search (default_schema by default)

- :server - The server to use

    # File lib/sequel/adapters/shared/postgres.rb, line 350
    def table_exists?(table, opts={})
      im = input_identifier_meth
      schema, table = schema_and_table(table)
      opts[:schema] ||= schema
      tables(opts){|ds| !ds.first(:relname=>im.call(table)).nil?}
    end

tables(opts={}) click to toggle source

Array of symbols specifying table names in the current database. The dataset used is yielded to the block if one is provided, otherwise, an array of symbols of table names is returned.

Options:

- :schema - The schema to search (default_schema by default)

- :server - The server to use

    # File lib/sequel/adapters/shared/postgres.rb, line 364
    def tables(opts={})
      ds = metadata_dataset.from(:pg_class).filter(:relkind=>'r').select(:relname).exclude(SQL::StringExpression.like(:relname, SYSTEM_TABLE_REGEXP)).server(opts[:server]).join(:pg_namespace, :oid=>:relnamespace, :nspname=>(opts[:schema]||default_schema||'public').to_s)
      m = output_identifier_meth
      block_given? ? yield(ds) : ds.map{|r| m.call(r[:relname])}
    end

[Validate]

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