initial commit

category/internal/logic/getcategorylogic.go

@@ -0,0 +1,85 @@
+package logic
+
+import (
+	"context"
+	"errors"
+
+	"godemo/category/category"
+	"godemo/category/internal/model"
+	"godemo/category/internal/svc"
+
+	"github.com/zeromicro/go-zero/core/logx"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+type GetCategoryLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewGetCategoryLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetCategoryLogic {
+	return &GetCategoryLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+func (l *GetCategoryLogic) GetCategory(in *category.GetCategoryRequest) (*category.CategoryInfoResponse, error) {
+	// 1. 参数校验
+	if in.Id == "" {
+		return nil, status.Error(codes.InvalidArgument, "分类ID不能为空")
+	}
+
+	// 2. 查询数据库
+	categoryData, err := l.svcCtx.CategoryModel.FindOne(l.ctx, in.Id)
+	if err != nil {
+		if errors.Is(err, model.ErrNotFound) {
+			l.Logger.Errorf("分类不存在, ID: %s", in.Id)
+			return nil, status.Error(codes.NotFound, "分类不存在")
+		}
+		l.Logger.Errorf("数据库查询失败: %v", err)
+		return nil, status.Error(codes.Internal, "内部错误")
+	}
+
+	// 3. 转换响应格式
+	return l.convertToResponse(categoryData), nil
+}
+
+func (l *GetCategoryLogic) convertToResponse(c *model.Categories) *category.CategoryInfoResponse {
+	// 处理可能为空的字段
+	var alias, parentID, description string
+
+	if c.Alias.Valid {
+		alias = c.Alias.String
+	}
+	if c.ParentId.Valid {
+		parentID = c.ParentId.String
+	}
+	if c.Description.Valid {
+		description = c.Description.String
+	}
+
+	// 处理时间戳
+	var updatedAt int64
+	if c.UpdatedAt.Valid {
+		updatedAt = c.UpdatedAt.Time.Unix()
+	} else {
+		updatedAt = c.CreatedAt.Unix() // 如果未更新过，使用创建时间
+	}
+
+	return &category.CategoryInfoResponse{
+		Category: &category.CategoryInfo{
+			Id:          c.Id,
+			SystemId:    c.SystemId,
+			Name:        c.Name,
+			Alias:       alias,
+			ParentId:    parentID,
+			Description: description,
+			CreatedAt:   c.CreatedAt.Unix(),
+			UpdatedAt:   updatedAt,
+		},
+	}
+}