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

Defined in:
activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb

Instance Method Summary collapse

Instance Method Details

#begin_db_transaction ⇒ Object

Begins a transaction.



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

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

#begin_isolated_db_transaction(isolation) ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 128

def begin_isolated_db_transaction(isolation) # :nodoc:
  internal_execute("BEGIN ISOLATION LEVEL #{transaction_isolation_levels.fetch(isolation)}", "TRANSACTION")
end

#build_explain_clause(options = []) ⇒ Object 



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 156

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

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

#commit_db_transaction ⇒ Object

Commits a transaction.



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 133

def commit_db_transaction # :nodoc:
  internal_execute("COMMIT", "TRANSACTION", allow_retry: false, uses_transaction: true)
end

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

:nodoc:



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 85

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 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 105

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, allow_retry: false, uses_transaction: true) ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 72

def exec_query(sql, name = "SQL", binds = [], prepare: false, async: false, allow_retry: false, uses_transaction: true) # :nodoc:
  execute_and_clear(sql, name, binds, prepare: prepare, async: async, allow_retry: allow_retry, uses_transaction: uses_transaction) do |result|
    types = {}
    fields = result.fields
    fields.each_with_index do |fname, i|
      ftype = result.ftype i
      fmod  = result.fmod i
      types[fname] = get_oid_type(ftype, fmod, fname)
    end
    build_result(columns: fields, rows: result.values, column_types: types)
  end
end

#exec_restart_db_transaction ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 143

def exec_restart_db_transaction # :nodoc:
  cancel_any_running_query
  internal_execute("ROLLBACK AND CHAIN", "TRANSACTION", allow_retry: false, uses_transaction: true)
end

#exec_rollback_db_transaction ⇒ Object

Aborts a transaction.



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 138

def exec_rollback_db_transaction # :nodoc:
  cancel_any_running_query
  internal_execute("ROLLBACK", "TRANSACTION", allow_retry: false, uses_transaction: true)
end

#execute(sql, name = nil, allow_retry: false) ⇒ Object

Executes an SQL statement, returning a PG::Result object on success or raising a PG::Error exception otherwise.

Setting allow_retry to true causes the db to reconnect and retry executing the SQL statement in case of a connection-related exception. This option should only be enabled for known idempotent queries.

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 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 44

def execute(sql, name = nil, allow_retry: false)
  sql = transform_query(sql)
  check_if_write_query(sql)

  mark_transaction_written_if_write(sql)

  with_raw_connection(allow_retry: allow_retry) do |conn|
    log(sql, name) do
      result = conn.async_exec(sql)
      handle_warnings(sql)
      result
    end
  end
ensure
  @notice_receiver_sql_warnings = []
end

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



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# 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 = exec_query(sql, "EXPLAIN", binds)
  PostgreSQL::ExplainPrettyPrinter.new.pp(result)
end

#high_precision_current_timestamp ⇒ Object 



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 152

def high_precision_current_timestamp
  HIGH_PRECISION_CURRENT_TIMESTAMP
end

#internal_execute(sql, name = "SCHEMA", allow_retry: true, uses_transaction: false) ⇒ Object 



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 61

def internal_execute(sql, name = "SCHEMA", allow_retry: true, uses_transaction: false)
  sql = transform_query(sql)
  check_if_write_query(sql)

  with_raw_connection(allow_retry: allow_retry, uses_transaction: uses_transaction) do |conn|
    log(sql, name) do
      conn.async_exec(sql)
    end
  end
end

#query(sql, name = nil) ⇒ Object

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



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb', line 14

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

  log(sql, name) do
    with_raw_connection do |conn|
      conn.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 'activerecord/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