PostgreSQL client

A library for connecting to and querying PostgreSQL databases (see Postgres Protocol). This driver uses the more efficient and secure extended query format of the PostgreSQL protocol.

Usage

Create a Connection:

  final conn = await Connection.open(Endpoint(
    host: 'localhost',
    database: 'postgres',
    username: 'user',
    password: 'pass',
  ));

Execute queries with execute:

  final result = await conn.execute("SELECT 'foo'");
  print(result[0][0]); // first row and first field

Named parameters, returning rows as map of column names:

  final result = await conn.execute(
    Sql.named('SELECT * FROM a_table WHERE id=@id'),
    parameters: {'id': 'xyz'},
  );
  print(result.first.toColumnMap());

Execute queries in a transaction:

  await conn.runTx((s) async {
    final rs = await s.execute('SELECT count(*) FROM foo');
    await s.execute(
      r'UPDATE a_table SET totals=$1 WHERE id=$2',
      parameters: [rs[0][0], 'xyz'],
    );
  });

See the API documentation: https://pub.dev/documentation/postgres/latest/

Connection pooling

The library supports connection pooling (and masking the connection pool as regular session executor).

Custom type codecs

The library supports registering custom type codecs (and generic object encoders) through theConnectionSettings.typeRegistry.

Streaming replication protocol

The library supports connecting to PostgreSQL using the Streaming Replication Protocol. See Connection documentation for more info. An example can also be found at the following repository: postgresql-dart-replication-example

Other notes

This library originally started as StableKernel's postgres library, but got a full API overhaul and partial rewrite of the internals.

Please file feature requests and bugs at the issue tracker.