feat: add postgres-backed repositories

internal/postgres/training_repository.go

@@ -0,0 +1,61 @@
+package postgres
+
+import (
+	"database/sql"
+
+	"gitlab.mareshq.com/hq/backoffice/backoffice-api/pkg/training"
+)
+
+type TrainingRepository struct {
+	db *sql.DB
+}
+
+func NewTrainingRepository(db *sql.DB) *TrainingRepository {
+	return &TrainingRepository{db: db}
+}
+
+func (r *TrainingRepository) Save(t *training.Training) error {
+	_, err := r.db.Exec("INSERT INTO training (id, name, days, description, price) VALUES ($1, $2, $3)", t.ID, t.Name, t.Days, t.Description, t.Price)
+	return err
+}
+
+func (r *TrainingRepository) Get(id training.ID) (*training.Training, error) {
+	var t training.Training
+	err := r.db.QueryRow("SELECT * FROM training WHERE id = $1", id).Scan(&t.ID, &t.Name, &t.Days, &t.Description, &t.Price)
+	if err != nil {
+		return nil, err
+	}
+
+	return &t, nil
+}
+
+func (r *TrainingRepository) Update(t *training.Training) error {
+	_, err := r.db.Exec("UPDATE training SET name = $1, days = $2, description = $3, price = $4 WHERE id = $5", t.Name, t.Days, t.Description, t.Price, t.ID)
+	return err
+}
+
+func (r *TrainingRepository) Delete(id training.ID) error {
+	_, err := r.db.Exec("DELETE FROM training WHERE id = $1", id)
+	return err
+}
+
+func (r *TrainingRepository) FindAll() ([]training.Training, error) {
+	rows, err := r.db.Query("SELECT * FROM training")
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var trainings []training.Training
+	for rows.Next() {
+		var t training.Training
+		err := rows.Scan(&t.ID, &t.Name, &t.Days, &t.Description, &t.Price)
+		if err != nil {
+			return nil, err
+		}
+
+		trainings = append(trainings, t)
+	}
+
+	return trainings, nil
+}