chore: initial commit

internal/service/category.go

@@ -0,0 +1,74 @@
+package service
+
+import (
+	"context"
+	db "server/internal/db/sqlc"
+	"server/internal/model/common"
+	"server/internal/model/request"
+	"server/internal/pkg/dberr"
+	"server/internal/pkg/errs"
+)
+
+type CategoryService struct {
+	queries *db.Queries
+}
+
+func NewCategoryService(queries *db.Queries) *CategoryService {
+	return &CategoryService{
+		queries: queries,
+	}
+}
+
+func (s *CategoryService) ListPage(ctx context.Context, p *common.Pagination) ([]db.Category, int64, error) {
+	params := db.ListCategoriesParams{
+		Limit:  p.PageSize,
+		Offset: (p.Page - 1) * p.PageSize,
+	}
+
+	total, err := s.queries.CountCategories(ctx)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	list, err := s.queries.ListCategories(ctx, params)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	return list, total, nil
+}
+
+func (s *CategoryService) ListAll(ctx context.Context) ([]db.Category, error) {
+	return s.queries.ListAllCategories(ctx)
+}
+
+func (s *CategoryService) Create(ctx context.Context, req request.CreateCategoryRequest) error {
+	params := db.CreateCategoryParams{
+		Name: req.Name,
+		Code: req.Code,
+	}
+
+	err := s.queries.CreateCategory(ctx, params)
+	return dberr.MapUniqueViolation(err, dberr.CategoryCodeKey, errs.ErrCategoryCodeAlreadyExists)
+}
+
+func (s *CategoryService) Update(ctx context.Context, id int32, req request.UpdateCategoryRequest) error {
+	params := db.UpdateCategoryParams{
+		ID:   id,
+		Name: req.Name,
+		Code: req.Code,
+	}
+	rows, err := s.queries.UpdateCategory(ctx, params)
+	// 先判断数据条目是否存在
+	if err = dberr.MapRowsAffected(rows, err, errs.ErrCategoryNotFound); err != nil {
+		// 再判断code是否重复
+		return dberr.MapUniqueViolation(err, dberr.CategoryCodeKey, errs.ErrCategoryCodeAlreadyExists)
+	}
+
+	return nil
+}
+
+func (s *CategoryService) Delete(ctx context.Context, id int32) error {
+	rows, err := s.queries.DeleteCategory(ctx, id)
+	return dberr.MapRowsAffected(rows, err, errs.ErrCategoryNotFound)
+}