Wraps postgres package with dart Objects and methods for performing sql queries

var db = PostgresDb.fromUrl('postgresql://username:password@hosturl/databaseName');
  await db.open();

var db = PostgresDb(host: 'host', databaseName: 'databaseName', username: 'username', password: 'password');
  await db.open();

     // insert
  await db.table('tableName').insert(columns: ['name', 'age'], values: ['Name Name', 30]);

  // update
  await db.table('tableName').update(update: {"age": 40}, where: Where('name', WhereOperator.isEqual, 'Name Name'));
  // update all
  await db.table('tableName').update(update: {"age": 40}, where: null);

  // delete
  await db.table('tableName').delete(Where('name', WhereOperator.isEqual, 'Name Name'));
  await db.table('tableName').deleteAll();

  // fetch
  await db.table('tableName').select(
    columns: [Column('id'), Column('name', columnAs: 'userName'), Column('age')],
    where: Where('name', WhereOperator.isEqual, 'Name Name'),
    orderBy: OrderBy('name', ascending: true)
  );

  // max, min, 
  await db.table('tableName').max([Max('age')]);
  await db.table('tableName').min([Min('age', label: 'minAge')]);

  // count
  await db.table('tableName').count([Count(columnName: '*')]);

  // sum, avg
  await db.table('tableName').sum([Sum(columnName: 'age', label: 'totalAge'), Sum(columnName: 'amount')]);
  await db.table('tableName').avg([Avg(columnName: 'age', label: 'averageAge'), Avg(columnName: 'amount')]);

  // aggregate
  await db.table('tableName').aggregate([
    Count(columnName: '*'),
    Sum(columnName: 'amount', label: 'totalAmount'),
    Avg(columnName: 'age', label: 'averageAge'),
  ]);

  // group
  await db.table('tableName').group(
    groupBy: ['gender'],
    columns: [Column('gender')],
    aggregates: [
      Count(columnName: '*'),
      Sum(columnName: 'amount', label: 'totalAmount'),
      Avg(columnName: 'age', label: 'averageAge'),
    ]
  );

  // join
  await db.table('tableName').join(
    tableAs: 't1',
    columns: [Column('t1.id', columnAs: 'id'), Column('t1.name', columnAs: 'name'), Column('t3.age', columnAs: 'age'),],
    joins: [
      Join(joinType: JoinType.inner, tableName: 'table2', tableAs: 't2', onorUsing: JoinOn(leftColumnName: 't1.id', rightColumnName: 't2.userid', operator: WhereOperator.isEqual)),
      Join(joinType: JoinType.inner, tableName: 'table3', tableAs: 't3', onorUsing: JoinUsing(columnName: 'userid')),
    ]
  );