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Datatypes

Arrays

PostgreSQL arrays are materialized as Go slices. Currently, only one-dimensional arrays are supported.

CREATE TABLE places (
  name text   not null,
  tags text[]
);
package db

type Place struct {
	Name string
	Tags []string
}

Dates and Time

All PostgreSQL time and date types are returned as time.Time structs. For null time or date values, the NullTime type from database/sql is used.

CREATE TABLE authors (
  id         SERIAL    PRIMARY KEY,
  created_at timestamp NOT NULL DEFAULT NOW(),
  updated_at timestamp
);
package db

import (
	"database/sql"
	"time"
)

type Author struct {
	ID        int
	CreatedAt time.Time
	UpdatedAt sql.NullTime
}

Enums

PostgreSQL enums are mapped to an aliased string type.

CREATE TYPE status AS ENUM (
  'open',
  'closed'
);

CREATE TABLE stores (
  name   text    PRIMARY KEY,
  status status  NOT NULL
);
package db

type Status string

const (
	StatusOpen   Status = "open"
	StatusClosed Status = "closed"
)

type Store struct {
	Name   string
	Status Status
}

Null

For structs, null values are represented using the appropriate type from the database/sql package.

CREATE TABLE authors (
  id   SERIAL PRIMARY KEY,
  name text   NOT NULL,
  bio  text
);
package db

import (
	"database/sql"
)

type Author struct {
	ID   int
	Name string
	Bio  sql.NullString
}

UUIDs

The Go standard library does not come with a uuid package. For UUID support, sqlc uses the excellent github.com/google/uuid package.

CREATE TABLE records (
  id   uuid PRIMARY KEY
);
package db

import (
	"github.com/google/uuid"
)

type Author struct {
	ID uuid.UUID
}