Publish an example testing go code with Postgres

user_repository.go

@@ -0,0 +1,55 @@
+// Copyright (c) 2023 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.
+
+package testing_go_code_with_postgres
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/google/uuid"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+func NewUserRepository(db *pgxpool.Pool) *UserRepository {
+	return &UserRepository{db: db}
+}
+
+type UserRepository struct {
+	db *pgxpool.Pool
+}
+
+func (r *UserRepository) ReadUser(ctx context.Context, userID uuid.UUID) (User, error) {
+	const sql = `SELECT user_id, username, created_at FROM users WHERE user_id = $1;`
+
+	user := User{}
+
+	row := r.db.QueryRow(ctx, sql, userID)
+	err := row.Scan(&user.ID, &user.Username, &user.CreatedAt)
+	if err != nil {
+		const format = "failed selection of User from database: %v"
+		return User{}, fmt.Errorf(format, err)
+	}
+
+	return user, nil
+}
+
+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(
+		ctx,
+		sql,
+		user.ID,
+		user.Username,
+		user.CreatedAt,
+	)
+
+	if err != nil {
+		const format = "failed insertion of User to database: %v"
+		return fmt.Errorf(format, err)
+	}
+
+	return nil
+}