Go-pg is a convenient PostgreSQL client and ORM for Golang with the
 following features:
 .
  - Basic types: integers, floats, string, bool, time.Time.
                  sql.NullBool, sql.NullString, sql.NullInt64,
                  sql.NullFloat64 and pg.NullTime
  - sql.Scanner and sql/driver.Valuer interfaces
  - Structs, maps and arrays are marshalled as JSON by default
  - PostgreSQL multidimensional Arrays using array tag and Array wrapper
  - Hstore using hstore tag and Hstore wrapper
  - All struct fields are nullable by default and zero values (empty string,
     0, zero time) are marshalled as SQL NULL. ``sql:",notnull"` is used to
     reverse this behaviour
  - Transactions
  - Prepared statements
  - Notifications using LISTEN and NOTIFY
  - Copying data using COPY FROM and COPY TO
  - Timeouts
  - Automatic connection pooling
  - Queries retries on network errors
  - Working with models using ORM and SQL
  - Scanning variables using ORM and SQL
  - SelectOrInsert using on-conflict
  - INSERT ... ON CONFLICT DO UPDATE using ORM
  - Common table expressions using WITH and WrapWith
  - CountEstimate using EXPLAIN to get estimated number of matching rows
  - HasOne, BelongsTo, HasMany and ManyToMany-
  - Creating tables from structs
  - Migrations
  - Sharding