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

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Included In: `::ActiveRecord::ConnectionAdapters::PostgreSQLAdapter`
Defined in:	activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb

Constant Summary

IDLE_TRANSACTION_STATUSES = private
# File 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 124
```
[PG::PQTRANS_IDLE, PG::PQTRANS_INTRANS, PG::PQTRANS_INERROR]
```

Instance Method Summary

#build_explain_clause(options = [])
#explain(arel, binds = [], options = [])
#high_precision_current_timestamp
#set_constraints(deferred, *constraints)

Set when constraints will be checked for the current transaction.

Instance Method Details

#build_explain_clause(options = [])

[ GitHub ]

# File 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 96


def build_explain_clause(options = [])
  return "EXPLAIN" if options.empty?

  "EXPLAIN (#{options.join(", ").upcase})"
end

#explain(arel, binds = [], options = [])

[ GitHub ]

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


def explain(arel, binds = [], options = [])
  sql    = build_explain_clause(options) + " " + to_sql(arel, binds)
  result = internal_exec_query(sql, "EXPLAIN", binds)
  PostgreSQL::ExplainPrettyPrinter.new.pp(result)
end

#high_precision_current_timestamp

[ GitHub ]

# File 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 92


def high_precision_current_timestamp
  HIGH_PRECISION_CURRENT_TIMESTAMP
end

#set_constraints(deferred, *constraints)

Set when constraints will be checked for the current transaction.

Not passing any specific constraint names will set the value for all deferrable constraints.

deferred: Valid values are :deferred or :immediate.

See www.postgresql.org/docs/current/sql-set-constraints.html

[ GitHub ]

# File 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 110


def set_constraints(deferred, *constraints)
  unless %i[deferred immediate].include?(deferred)
    raise ArgumentError, "deferred must be :deferred or :immediate"
  end

  constraints = if constraints.empty?
    "ALL"
  else
    constraints.map { |c| quote_table_name(c) }.join(", ")
  end
  execute("SET CONSTRAINTS #{constraints} #{deferred.to_s.upcase}")
end