Module: Sequel::Postgres::AdapterMethods

Included in:
DataObjects::Postgres::AdapterMethods, JDBC::Postgres::AdapterMethods, Adapter, Swift::Postgres::AdapterMethods
Defined in:
lib/sequel/adapters/shared/postgres.rb

Overview

Methods shared by adapter/connection instances.

Constant Summary collapse

SELECT_CURRVAL = 
"SELECT currval('%s')".freeze
SELECT_CUSTOM_SEQUENCE = 
proc do |schema, table| "  SELECT '\"' || name.nspname || '\".' || CASE  \n      WHEN split_part(def.adsrc, '''', 2) ~ '.' THEN  \n        substr(split_part(def.adsrc, '''', 2),  \n               strpos(split_part(def.adsrc, '''', 2), '.')+1) \n      ELSE split_part(def.adsrc, '''', 2)  \n    END\n  FROM pg_class t\n  JOIN pg_namespace  name ON (t.relnamespace = name.oid)\n  JOIN pg_attribute  attr ON (t.oid = attrelid)\n  JOIN pg_attrdef    def  ON (adrelid = attrelid AND adnum = attnum)\n  JOIN pg_constraint cons ON (conrelid = adrelid AND adnum = conkey[1])\n  WHERE cons.contype = 'p'\n    AND def.adsrc ~* 'nextval'\n    \#{\"AND name.nspname = '\#{schema}'\" if schema}\n    AND t.relname = '\#{table}'\n"
end
SELECT_PK = 
proc do |schema, table| "  SELECT pg_attribute.attname\n  FROM pg_class, pg_attribute, pg_index, pg_namespace\n  WHERE pg_class.oid = pg_attribute.attrelid\n    AND pg_class.relnamespace  = pg_namespace.oid\n    AND pg_class.oid = pg_index.indrelid\n    AND pg_index.indkey[0] = pg_attribute.attnum\n    AND pg_index.indisprimary = 't'\n    \#{\"AND pg_namespace.nspname = '\#{schema}'\" if schema}\n    AND pg_class.relname = '\#{table}'\n"
end
SELECT_SERIAL_SEQUENCE = 
proc do |schema, table| "  SELECT  '\"' || name.nspname || '\".' || seq.relname || ''\n  FROM pg_class seq, pg_attribute attr, pg_depend dep,\n    pg_namespace name, pg_constraint cons\n  WHERE seq.oid = dep.objid\n    AND seq.relnamespace  = name.oid\n    AND seq.relkind = 'S'\n    AND attr.attrelid = dep.refobjid\n    AND attr.attnum = dep.refobjsubid\n    AND attr.attrelid = cons.conrelid\n    AND attr.attnum = cons.conkey[1]\n    AND cons.contype = 'p'\n    \#{\"AND name.nspname = '\#{schema}'\" if schema}\n    AND seq.relname = '\#{table}'\n"
end

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#db=(value) ⇒ Object (writeonly)

Sets the attribute db

Parameters:

  • value —

    the value to set the attribute db to.



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# File 'lib/sequel/adapters/shared/postgres.rb', line 57

def db=(value)
  @db = value
end

#transaction_depth ⇒ Object

Depth of the current transaction on this connection, used to implement multi-level transactions with savepoints.



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# File 'lib/sequel/adapters/shared/postgres.rb', line 109

def transaction_depth
  @transaction_depth
end

Instance Method Details

#apply_connection_settings ⇒ Object

Apply connection settings for this connection. Currently, turns standard_conforming_strings ON if Postgres.force_standard_strings is true.



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# File 'lib/sequel/adapters/shared/postgres.rb', line 114

def apply_connection_settings
  if Postgres.force_standard_strings
    # This setting will only work on PostgreSQL 8.2 or greater
    # and we don't know the server version at this point, so
    # try it unconditionally and rescue any errors.
    execute("SET standard_conforming_strings = ON") rescue nil
  end
  if cmm = Postgres.client_min_messages
    execute("SET client_min_messages = '#{cmm.to_s.upcase}'")
  end
end

#last_insert_id(sequence) ⇒ Object

Get the last inserted value for the given sequence.



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# File 'lib/sequel/adapters/shared/postgres.rb', line 127

def last_insert_id(sequence)
  sql = SELECT_CURRVAL % sequence
  execute(sql) do |r|
    val = single_value(r)
    return val.to_i if val
  end
end

#primary_key(schema, table) ⇒ Object

Get the primary key for the given table.



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# File 'lib/sequel/adapters/shared/postgres.rb', line 136

def primary_key(schema, table)
  sql = SELECT_PK[schema, table]
  execute(sql) do |r|
    return single_value(r)
  end
end

#sequence(schema, table) ⇒ Object

Get the primary key and sequence for the given table.



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# File 'lib/sequel/adapters/shared/postgres.rb', line 144

def sequence(schema, table)
  sql = SELECT_SERIAL_SEQUENCE[schema, table]
  execute(sql) do |r|
    seq = single_value(r)
    return seq if seq
  end
  
  sql = SELECT_CUSTOM_SEQUENCE[schema, table]
  execute(sql) do |r|
    return single_value(r)
  end
end