Feat: pgxpool, added more example using pgx driver

examples/go-pgx-migration/go.mod

@@ -0,0 +1,48 @@
+module go-pgx-migration
+
+go 1.21.1
+
+require (
+	github.com/jackc/pgx/v5 v5.5.1
+	github.com/ory/dockertest/v3 v3.10.0
+	github.com/pressly/goose/v3 v3.17.0
+)
+
+require (
+	github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161 // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5 // indirect
+	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
+	github.com/containerd/continuity v0.4.3 // indirect
+	github.com/docker/cli v24.0.7+incompatible // indirect
+	github.com/docker/docker v24.0.7+incompatible // indirect
+	github.com/docker/go-connections v0.4.0 // indirect
+	github.com/docker/go-units v0.5.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
+	github.com/imdario/mergo v0.3.16 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/jackc/puddle/v2 v2.2.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/moby/term v0.5.0 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.1.0-rc5 // indirect
+	github.com/opencontainers/runc v1.1.10 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/rogpeppe/go-internal v1.12.0 // indirect
+	github.com/sethvargo/go-retry v0.2.4 // indirect
+	github.com/sirupsen/logrus v1.9.3 // indirect
+	github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
+	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
+	github.com/xeipuuv/gojsonschema v1.2.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	golang.org/x/crypto v0.16.0 // indirect
+	golang.org/x/mod v0.14.0 // indirect
+	golang.org/x/sync v0.5.0 // indirect
+	golang.org/x/sys v0.15.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	golang.org/x/tools v0.15.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)

examples/go-pgx-migration/main.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"database/sql"
+	"embed"
+	"errors"
+	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/pressly/goose/v3"
+)
+
+type Migration struct {
+	db *sql.DB
+}
+
+//go:embed migrations/*.sql
+var embedMigrations embed.FS
+
+func NewMigration(pool *pgxpool.Pool) (*Migration, error) {
+	if pool == nil {
+		return &Migration{}, errors.New("pool is nil")
+	}
+
+	goose.SetBaseFS(embedMigrations)
+
+	if err := goose.SetDialect("postgres"); err != nil {
+		return &Migration{}, err
+	}
+
+	cp := pool.Config().ConnConfig.ConnString()
+	db, err := sql.Open("pgx/v5", cp)
+	if err != nil {
+		return &Migration{}, err
+	}
+
+	return &Migration{db: db}, nil
+}
+
+func (m *Migration) Up() error {
+	if err := goose.Up(m.db, "migrations"); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (m *Migration) Down() error {
+	if err := goose.Down(m.db, "migrations"); err != nil {
+		return err
+	}
+	return nil
+}

examples/go-pgx-migration/main_test.go

@@ -0,0 +1,83 @@
+package main_test
+
+import (
+	"context"
+	"fmt"
+	"github.com/jackc/pgx/v5/pgxpool"
+	_ "github.com/jackc/pgx/v5/stdlib"
+	"github.com/ory/dockertest/v3"
+	"github.com/ory/dockertest/v3/docker"
+	main "go-pgx-migration"
+	"log"
+	"os"
+	"testing"
+	"time"
+)
+
+var pool *pgxpool.Pool
+
+func TestMain(m *testing.M) {
+	dockerPool, err := dockertest.NewPool("")
+	if err != nil {
+		log.Fatalf("Could not connect to docker %v", err)
+	}
+
+	resource, err := dockerPool.RunWithOptions(&dockertest.RunOptions{
+		Repository: "postgres",
+		Tag:        "16",
+		Env: []string{
+			"POSTGRES_PASSWORD=secret",
+			"POSTGRES_USER=postgres",
+			"POSTGRES_DB=postgres",
+			"listen_addresses = '*'",
+		},
+	}, func(config *docker.HostConfig) {
+		config.AutoRemove = true
+		config.RestartPolicy = docker.RestartPolicy{
+			Name: "no",
+		}
+	})
+	if err != nil {
+		log.Fatalf("Could not start resource %v", err)
+	}
+
+	hostAndPort := resource.GetHostPort("5432/tcp")
+	databaseUrl := fmt.Sprintf("postgres://postgres:secret@%s/postgres?sslmode=disable", hostAndPort)
+
+	if err := resource.Expire(120); err != nil {
+		log.Fatalf("Could not set expire %v", err)
+	} // Tell docker to hard kill the container in 120 seconds
+
+	dockerPool.MaxWait = 120 * time.Second
+	if err := dockerPool.Retry(func() error {
+		var err error
+		pool, err = pgxpool.New(context.Background(), databaseUrl)
+		if err != nil {
+			return err
+		}
+		return pool.Ping(context.Background())
+	}); err != nil {
+		log.Fatalf("Could not connect to docker %v", err)
+	}
+	os.Exit(m.Run())
+}
+
+func TestMigration(t *testing.T) {
+	migration, err := main.NewMigration(pool)
+	if err != nil {
+		t.Errorf("NewMigration failed %v", err)
+	}
+
+	t.Run("Up Migration", func(t *testing.T) {
+		err = migration.Up()
+		if err != nil {
+			t.Errorf("Migration failed %v", err)
+		}
+	})
+	t.Run("Down Migration", func(t *testing.T) {
+		err = migration.Down()
+		if err != nil {
+			t.Errorf("Migration failed %v", err)
+		}
+	})
+}

examples/go-pgx-migration/migrations/00001_create_users_table.sql

@@ -0,0 +1,14 @@
+-- +goose Up
+CREATE TABLE users (
+    id SERIAL PRIMARY KEY,
+    username TEXT,
+    name TEXT,
+    surname TEXT
+);
+
+INSERT INTO users VALUES
+(0, 'root', '', ''),
+(1, 'vojtechvitek', 'Vojtech', 'Vitek');
+
+-- +goose Down
+DROP TABLE users;

examples/go-pgx-migration/migrations/00002_rename_root.go

@@ -0,0 +1,22 @@
+package migrations
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/pressly/goose/v3"
+)
+
+func init() {
+	goose.AddMigrationContext(Up00002, Down00002)
+}
+
+func Up00002(ctx context.Context, tx *sql.Tx) error {
+	_, err := tx.ExecContext(ctx, "UPDATE users SET username='admin' WHERE username='root';")
+	return err
+}
+
+func Down00002(ctx context.Context, tx *sql.Tx) error {
+	_, err := tx.ExecContext(ctx, "UPDATE users SET username='root' WHERE username='admin';")
+	return err
+}

examples/go-pgx-migration/migrations/00003_add_user_no_tx.go

@@ -0,0 +1,44 @@
+package migrations
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+
+	"github.com/pressly/goose/v3"
+)
+
+func init() {
+	goose.AddMigrationNoTxContext(Up00003, Down00003)
+}
+
+func Up00003(ctx context.Context, db *sql.DB) error {
+	id, err := getUserID(db, "jamesbond")
+	if err != nil {
+		return err
+	}
+	if id == 0 {
+		query := "INSERT INTO users (username, name, surname) VALUES ($1, $2, $3)"
+		if _, err := db.ExecContext(ctx, query, "jamesbond", "James", "Bond"); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func getUserID(db *sql.DB, username string) (int, error) {
+	var id int
+	err := db.QueryRow("SELECT id FROM users WHERE username = $1", username).Scan(&id)
+	if err != nil && !errors.Is(err, sql.ErrNoRows) {
+		return 0, err
+	}
+	return id, nil
+}
+
+func Down00003(ctx context.Context, db *sql.DB) error {
+	query := "DELETE FROM users WHERE username = $1"
+	if _, err := db.ExecContext(ctx, query, "jamesbond"); err != nil {
+		return err
+	}
+	return nil
+}

examples/go-pgx-migration/readme.md

@@ -0,0 +1,7 @@
+# STACKS
+- Postgres
+- Go
+- [Pgx/v5](https://github.com/jackc/pgx/tree/v5.5.1)
+- [Pgx/v5/stdlib](https://github.com/jackc/pgx/blob/master/stdlib/sql.go#L69)
+- [Pgx/v5/pgxpool](https://github.com/jackc/pgx/blob/master/pgxpool/pool.go#L1)
+- [Dockertest](https://github.com/ory/dockertest)