Migrate to sql.DB driver

This is to reduce dependency on a particular driver. In the future this
will be used to implement different ways of cleaning the database.

LICENSE

@@ -1,6 +1,6 @@
 BSD 3-Clause License
 
-Copyright (c) 2023, Vasiliy Vasilyuk
+Copyright (c) 2023-2024, Vasiliy Vasilyuk
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:

testingpg/testingpg.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2023 Vasiliy Vasilyuk. All rights reserved.
+// Copyright (c) 2023-2024 Vasiliy Vasilyuk. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
@@ -7,6 +7,7 @@ package testingpg
 import (
 	"context"
 	"crypto/rand"
+	"database/sql"
 	"encoding/base64"
 	"fmt"
 	"net/url"
@@ -16,7 +17,7 @@ import (
 	"time"
 	"unicode"
 
-	"github.com/jackc/pgx/v5/pgxpool"
+	_ "github.com/jackc/pgx/v5/stdlib"
 	"github.com/stretchr/testify/require"
 )
 
@@ -40,8 +41,8 @@ type Postgres struct {
 	url string
 	ref string
 
-	pgxpool     *pgxpool.Pool
-	pgxpoolOnce sync.Once
+	sqlDB     *sql.DB
+	sqlDBOnce sync.Once
 }
 
 func newPostgres(t TestingT) *Postgres {
@@ -71,12 +72,12 @@ func (p *Postgres) URL() string {
 	return p.url
 }
 
-func (p *Postgres) PgxPool() *pgxpool.Pool {
-	p.pgxpoolOnce.Do(func() {
-		p.pgxpool = newPGxPool(p.t, p.URL())
+func (p *Postgres) DB() *sql.DB {
+	p.sqlDBOnce.Do(func() {
+		p.sqlDB = open(p.t, p.URL())
 	})
 
-	return p.pgxpool
+	return p.sqlDB
 }
 
 func (p *Postgres) cloneFromReference() *Postgres {
@@ -90,7 +91,7 @@ func (p *Postgres) cloneFromReference() *Postgres {
 		p.ref,
 	)
 
-	_, err := p.PgxPool().Exec(context.Background(), sql)
+	_, err := p.DB().ExecContext(context.Background(), sql)
 	require.NoError(p.t, err)
 
 	// Automatically drop database copy after the test is completed.
@@ -100,7 +101,7 @@ func (p *Postgres) cloneFromReference() *Postgres {
 		ctx, done := context.WithTimeout(context.Background(), time.Minute)
 		defer done()
 
-		_, err := p.PgxPool().Exec(ctx, sql)
+		_, err := p.DB().ExecContext(ctx, sql)
 		require.NoError(p.t, err)
 	})
 
@@ -169,17 +170,14 @@ func replaceDBName(t TestingT, dataSourceURL, dbname string) string {
 	return r.String()
 }
 
-func newPGxPool(t TestingT, dataSourceURL string) *pgxpool.Pool {
-	ctx, done := context.WithTimeout(context.Background(), 1*time.Second)
-	defer done()
-
-	pool, err := pgxpool.New(ctx, dataSourceURL)
+func open(t TestingT, dataSourceURL string) *sql.DB {
+	db, err := sql.Open("pgx/v5", dataSourceURL)
 	require.NoError(t, err)
 
 	// Automatically close connection after the test is completed.
 	t.Cleanup(func() {
-		pool.Close()
+		db.Close()
 	})
 
-	return pool
+	return db
 }

testingpg/testingpg_test.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2023 Vasiliy Vasilyuk. All rights reserved.
+// Copyright (c) 2023-2024 Vasiliy Vasilyuk. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
@@ -50,7 +50,7 @@ func TestNewPostgres(t *testing.T) {
 
 		// Act
 		var version string
-		err := postgres.PgxPool().QueryRow(ctx, "SELECT version();").Scan(&version)
+		err := postgres.DB().QueryRowContext(ctx, "SELECT version();").Scan(&version)
 
 		// Assert
 		require.NoError(t, err)
@@ -70,8 +70,8 @@ func TestNewPostgres(t *testing.T) {
 
 		// Act
 		const sql = `CREATE TABLE "no_conflict" (id integer PRIMARY KEY)`
-		_, err1 := postgres1.PgxPool().Exec(ctx, sql)
-		_, err2 := postgres2.PgxPool().Exec(ctx, sql)
+		_, err1 := postgres1.DB().ExecContext(ctx, sql)
+		_, err2 := postgres2.DB().ExecContext(ctx, sql)
 
 		// Assert
 		require.NoError(t, err1)

user_repository.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2023 Vasiliy Vasilyuk. All rights reserved.
+// Copyright (c) 2023-2024 Vasiliy Vasilyuk. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
@@ -6,18 +6,18 @@ package testing_go_code_with_postgres
 
 import (
 	"context"
+	"database/sql"
 	"fmt"
 
 	"github.com/google/uuid"
-	"github.com/jackc/pgx/v5/pgxpool"
 )
 
-func NewUserRepository(db *pgxpool.Pool) *UserRepository {
+func NewUserRepository(db *sql.DB) *UserRepository {
 	return &UserRepository{db: db}
 }
 
 type UserRepository struct {
-	db *pgxpool.Pool
+	db *sql.DB
 }
 
 func (r *UserRepository) ReadUser(ctx context.Context, userID uuid.UUID) (User, error) {
@@ -25,7 +25,7 @@ func (r *UserRepository) ReadUser(ctx context.Context, userID uuid.UUID) (User,
 
 	user := User{}
 
-	row := r.db.QueryRow(ctx, sql, userID)
+	row := r.db.QueryRowContext(ctx, sql, userID)
 
 	err := row.Scan(&user.ID, &user.Username, &user.CreatedAt)
 	if err != nil {
@@ -40,7 +40,7 @@ func (r *UserRepository) ReadUser(ctx context.Context, userID uuid.UUID) (User,
 func (r *UserRepository) CreateUser(ctx context.Context, user User) error {
 	const sql = `INSERT INTO users (user_id, username, created_at) VALUES ($1,$2,$3);`
 
-	_, err := r.db.Exec(
+	_, err := r.db.ExecContext(
 		ctx,
 		sql,
 		user.ID,

user_repository_test.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2023 Vasiliy Vasilyuk. All rights reserved.
+// Copyright (c) 2023-2024 Vasiliy Vasilyuk. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
@@ -36,7 +36,7 @@ func TestUserRepository_CreateUser(t *testing.T) {
 
 		// Arrange
 		postgres := testingpg.New(t)
-		repo := rootpkg.NewUserRepository(postgres.PgxPool())
+		repo := rootpkg.NewUserRepository(postgres.DB())
 
 		user := newFullyFiledUser()
 
@@ -57,7 +57,7 @@ func TestUserRepository_CreateUser(t *testing.T) {
 
 		// Arrange
 		postgres := testingpg.New(t)
-		repo := rootpkg.NewUserRepository(postgres.PgxPool())
+		repo := rootpkg.NewUserRepository(postgres.DB())
 
 		user := newFullyFiledUser()
 
@@ -85,7 +85,7 @@ func TestUserRepository_ReadUser(t *testing.T) {
 
 		// Arrange
 		postgres := testingpg.New(t)
-		repo := rootpkg.NewUserRepository(postgres.PgxPool())
+		repo := rootpkg.NewUserRepository(postgres.DB())
 
 		// Act
 		_, err := repo.ReadUser(context.Background(), uuid.New())