feat: 初始提交云印享付费打印服务后端

cloudprint-backend/internal/repository/user_repository.go

@@ -0,0 +1,64 @@
+package repository
+
+import (
+	"context"
+	"errors"
+
+	"github.com/cloudprint/cloudprint-backend/internal/model"
+	"gorm.io/gorm"
+)
+
+type UserRepository struct {
+	db *gorm.DB
+}
+
+func NewUserRepository(db *gorm.DB) *UserRepository {
+	return &UserRepository{db: db}
+}
+
+func (r *UserRepository) Create(ctx context.Context, user *model.User) error {
+	return r.db.WithContext(ctx).Create(user).Error
+}
+
+func (r *UserRepository) GetByID(ctx context.Context, id int32) (*model.User, error) {
+	var user model.User
+	err := r.db.WithContext(ctx).First(&user, id).Error
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, nil
+		}
+		return nil, err
+	}
+	return &user, nil
+}
+
+func (r *UserRepository) GetByOpenid(ctx context.Context, openid string) (*model.User, error) {
+	var user model.User
+	err := r.db.WithContext(ctx).Where("openid = ?", openid).First(&user).Error
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, nil
+		}
+		return nil, err
+	}
+	return &user, nil
+}
+
+func (r *UserRepository) Update(ctx context.Context, user *model.User) error {
+	return r.db.WithContext(ctx).Save(user).Error
+}
+
+func (r *UserRepository) UpdateBalance(ctx context.Context, userID int32, balance float64) error {
+	return r.db.WithContext(ctx).Model(&model.User{}).Where("id = ?", userID).Update("balance", balance).Error
+}
+
+func (r *UserRepository) DeductBalance(ctx context.Context, userID int32, amount float64) error {
+	return r.db.WithContext(ctx).Model(&model.User{}).
+		Where("id = ? AND balance >= ?", userID, amount).
+		Update("balance", gorm.Expr("balance - ?", amount)).Error
+}
+
+func (r *UserRepository) AddBalance(ctx context.Context, userID int32, amount float64) error {
+	return r.db.WithContext(ctx).Model(&model.User{}).Where("id = ?", userID).
+		Update("balance", gorm.Expr("balance + ?", amount)).Error
+}