Module: ActiveRecord::ConnectionAdapters::PostgreSQL::DatabaseStatements

Included in:
ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
Defined in:
lib/active_record/connection_adapters/postgresql/database_statements.rb

Instance Method Summary collapse

Instance Method Details

#begin_db_transactionObject

Begins a transaction.


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# File 'lib/active_record/connection_adapters/postgresql/database_statements.rb', line 109

def begin_db_transaction # :nodoc:
  execute("BEGIN", "TRANSACTION")
end

#begin_isolated_db_transaction(isolation) ⇒ Object

:nodoc:


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# File 'lib/active_record/connection_adapters/postgresql/database_statements.rb', line 113

def begin_isolated_db_transaction(isolation) # :nodoc:
  begin_db_transaction
  execute "SET TRANSACTION ISOLATION LEVEL #{transaction_isolation_levels.fetch(isolation)}"
end

#commit_db_transactionObject

Commits a transaction.


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# File 'lib/active_record/connection_adapters/postgresql/database_statements.rb', line 119

def commit_db_transaction # :nodoc:
  execute("COMMIT", "TRANSACTION")
end

#exec_delete(sql, name = nil, binds = []) ⇒ Object Also known as: exec_update

:nodoc:


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# File 'lib/active_record/connection_adapters/postgresql/database_statements.rb', line 70

def exec_delete(sql, name = nil, binds = []) # :nodoc:
  execute_and_clear(sql, name, binds) { |result| result.cmd_tuples }
end

#exec_insert(sql, name = nil, binds = [], pk = nil, sequence_name = nil) ⇒ Object

:nodoc:


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# File 'lib/active_record/connection_adapters/postgresql/database_statements.rb', line 90

def exec_insert(sql, name = nil, binds = [], pk = nil, sequence_name = nil) # :nodoc:
  if use_insert_returning? || pk == false
    super
  else
    result = exec_query(sql, name, binds)
    unless sequence_name
      table_ref = extract_table_ref_from_insert_sql(sql)
      if table_ref
        pk = primary_key(table_ref) if pk.nil?
        pk = suppress_composite_primary_key(pk)
        sequence_name = default_sequence_name(table_ref, pk)
      end
      return result unless sequence_name
    end
    last_insert_id_result(sequence_name)
  end
end

#exec_query(sql, name = "SQL", binds = [], prepare: false, async: false) ⇒ Object

:nodoc:


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# File 'lib/active_record/connection_adapters/postgresql/database_statements.rb', line 53

def exec_query(sql, name = "SQL", binds = [], prepare: false, async: false) # :nodoc:
  execute_and_clear(sql, name, binds, prepare: prepare, async: async) do |result|
    types = {}
    fields = result.fields
    fields.each_with_index do |fname, i|
      ftype = result.ftype i
      fmod  = result.fmod i
      case type = get_oid_type(ftype, fmod, fname)
      when Type::Integer, Type::Float, OID::Decimal, Type::String, Type::DateTime, Type::Boolean
        # skip if a column has already been type casted by pg decoders
      else types[fname] = type
      end
    end
    build_result(columns: fields, rows: result.values, column_types: types)
  end
end

#exec_rollback_db_transactionObject

Aborts a transaction.


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# File 'lib/active_record/connection_adapters/postgresql/database_statements.rb', line 124

def exec_rollback_db_transaction # :nodoc:
  execute("ROLLBACK", "TRANSACTION")
end

#execute(sql, name = nil) ⇒ Object

Executes an SQL statement, returning a PG::Result object on success or raising a PG::Error exception otherwise. Note: the PG::Result object is manually memory managed; if you don't need it specifically, you may want consider the exec_query wrapper.


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# File 'lib/active_record/connection_adapters/postgresql/database_statements.rb', line 39

def execute(sql, name = nil)
  sql = transform_query(sql)
  check_if_write_query(sql)

  materialize_transactions
  mark_transaction_written_if_write(sql)

  log(sql, name) do
    ActiveSupport::Dependencies.interlock.permit_concurrent_loads do
      @connection.async_exec(sql)
    end
  end
end

#explain(arel, binds = []) ⇒ Object


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# File 'lib/active_record/connection_adapters/postgresql/database_statements.rb', line 7

def explain(arel, binds = [])
  sql = "EXPLAIN #{to_sql(arel, binds)}"
  PostgreSQL::ExplainPrettyPrinter.new.pp(exec_query(sql, "EXPLAIN", binds))
end

#high_precision_current_timestampObject


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# File 'lib/active_record/connection_adapters/postgresql/database_statements.rb', line 132

def high_precision_current_timestamp
  HIGH_PRECISION_CURRENT_TIMESTAMP
end

#query(sql, name = nil) ⇒ Object

Queries the database and returns the results in an Array-like object


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# File 'lib/active_record/connection_adapters/postgresql/database_statements.rb', line 13

def query(sql, name = nil) # :nodoc:
  materialize_transactions
  mark_transaction_written_if_write(sql)

  log(sql, name) do
    ActiveSupport::Dependencies.interlock.permit_concurrent_loads do
      @connection.async_exec(sql).map_types!(@type_map_for_results).values
    end
  end
end

#write_query?(sql) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean)

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# File 'lib/active_record/connection_adapters/postgresql/database_statements.rb', line 29

def write_query?(sql) # :nodoc:
  !READ_QUERY.match?(sql)
rescue ArgumentError # Invalid encoding
  !READ_QUERY.match?(sql.b)
end