wip(lyra): 保存带选项列表查询的未完成设计

- 添加通用查询选项、分类过滤选项及动态缓存键生成
- 新增分类创建与更新时间字段

当前实现尚未完成，留待后续继续设计：
- 明确通用查询选项、模型过滤条件与缓存策略的边界
- 补齐数据库回源，修正分类返回类型及过滤条件生效问题
- 修正分页偏移计算，增加参数边界校验和稳定排序
- 完善缓存故障降级、空结果缓存及写后失效策略
- 修正缓存键参数编码歧义，补齐查询名和版本前缀
- 补充测试并验证编译与查询行为

go/projects/lyra/internal/cache/cache.go

@@ -2,6 +2,7 @@ package cache
 
 import (
 	"context"
+	"crypto/md5"
 	"encoding/json/v2"
 	"errors"
 	"fmt"
@@ -66,3 +67,19 @@ func (c *Cache) Set[T any](ctx context.Context, entry Entry[T]) error {
 	}
 	return nil
 }
+
+func GenCacheKey(table, sql string, args ...any) (key string, err error) {
+	prefix := fmt.Sprintf("lyra:cache:%s:", table)
+	h := md5.New()
+	// 写入查询语句
+	h.Write([]byte(sql))
+	// 序列化并写入每个参数
+	for _, arg := range args {
+		jsonData, err := json.Marshal(arg)
+		if err != nil {
+			return "", fmt.Errorf("序列化参数失败：%w", err)
+		}
+		h.Write(jsonData)
+	}
+	return prefix + fmt.Sprintf("%x", h.Sum(nil)), nil
+}

go/projects/lyra/internal/model/category.go

@@ -7,6 +7,7 @@ import (
 
 	"lyra/internal/cache"
 	"lyra/internal/pkg/constant"
+	"lyra/internal/pkg/query"
 	"lyra/internal/util"
 
 	sq "github.com/Masterminds/squirrel"
@@ -18,18 +19,22 @@ type Category struct {
 	Slug      string    `db:"slug"`
 	Title     string    `db:"title"`
 	Sort      int       `db:"sort"`
+	CreatedAt time.Time `db:"created_at"`
+	UpdatedAt time.Time `db:"updated_at"`
 }
 
 type CategoryModel interface {
 	FindAll(ctx context.Context) ([]*Category, error)
+	ListWithOptions(ctx context.Context, queryOpt query.Option, modelOpts ...ModelOption) (resp []*Link, err error)
 }
 type defaultCategoryModel struct {
 	db    *sqlx.DB
+	table string
 	cache *cache.Cache
 }
 
 func NewCategoryModel(db *sqlx.DB, cache *cache.Cache) CategoryModel {
-	return &defaultCategoryModel{db: db, cache: cache}
+	return &defaultCategoryModel{db: db, table: "categories", cache: cache}
 }
 
 const categoryListCacheTTL = 5 * time.Minute
@@ -68,3 +73,60 @@ func (m *defaultCategoryModel) FindAll(ctx context.Context) ([]*Category, error)
 	}
 	return rows, nil
 }
+
+type ModelOption func(*sq.SelectBuilder)
+
+func (m *defaultCategoryModel) ListWithOptions(ctx context.Context, queryOpt query.Option, modelOpts ...ModelOption) (resp []*Link, err error) {
+	// 1.先构建查询语句(还没有deleted字段)
+	// 2.根据queryOpt的参数，设置分页、排序等
+	sqBuilder := sq.Select("id", "slug", "title", "sort").
+		From("categories").Limit(uint64(queryOpt.PageSize)).
+		Offset(uint64(queryOpt.Page)).
+		PlaceholderFormat(sq.Dollar)
+	for _, opt := range modelOpts {
+		opt(new(sqBuilder))
+	}
+
+	query, args, err := sqBuilder.ToSql()
+	if err != nil {
+		return nil, fmt.Errorf("squirrel 构造SQL出错: %w", err)
+	}
+	cacheKey, err := cache.GenCacheKey(m.table, query, args...)
+	if err != nil {
+		return nil, err
+	}
+	result, hit, err := m.cache.Get[[]*Link](ctx, cacheKey)
+	if err != nil {
+		return nil, err
+	}
+	if hit {
+		return result, nil
+	}
+	if queryOpt.WithCacheWrite {
+		if err := m.cache.Set(ctx, cache.Entry[[]*Link]{
+			Key:   cacheKey,
+			Value: result,
+			TTL:   queryOpt.CacheTTL,
+		}); err != nil {
+			return nil, err
+		}
+	}
+	return result, nil
+}
+
+func WithCategorySlug(slug string) ModelOption {
+	return func(builder *sq.SelectBuilder) {
+		*builder = builder.Where(sq.Eq{"categories.slug": slug})
+	}
+}
+func WithCategoryTitle(title string) ModelOption {
+	return func(builder *sq.SelectBuilder) {
+		*builder = builder.Where(sq.Eq{"categories.title": title})
+	}
+}
+
+func WithCategorySort(sort int) ModelOption {
+	return func(builder *sq.SelectBuilder) {
+		*builder = builder.Where(sq.Eq{"categories.sort": sort})
+	}
+}

go/projects/lyra/internal/pkg/query/query.go

@@ -0,0 +1,82 @@
+package query
+
+import "time"
+
+const (
+	defaultPage             = 1
+	defaultPageSize         = 10
+	defaultIncludeDeleted   = false
+	defaultWithCacheWrite   = false
+	defaultCacheTTL         = 5 * time.Minute
+	defaultNotFoundCacheTTL = 1 * time.Minute
+)
+
+type Option struct {
+	Page             int
+	PageSize         int
+	IncludeDeleted   bool
+	WithCacheWrite   bool
+	CacheTTL         time.Duration
+	NotFoundCacheTTL time.Duration
+}
+
+type OptionFunc func(*Option)
+
+func NewOption(opts ...OptionFunc) *Option {
+	queryOpntion := &Option{
+		Page:             defaultPage,
+		PageSize:         defaultPageSize,
+		IncludeDeleted:   defaultIncludeDeleted,
+		WithCacheWrite:   defaultWithCacheWrite,
+		CacheTTL:         defaultCacheTTL,
+		NotFoundCacheTTL: defaultNotFoundCacheTTL,
+	}
+	for _, opt := range opts {
+		opt(queryOpntion)
+	}
+	return queryOpntion
+}
+
+func WithPage(page int) OptionFunc {
+	return func(o *Option) {
+		if page > 0 {
+			o.Page = page
+		}
+	}
+}
+
+func WithPageSize(pageSize int) OptionFunc {
+	return func(o *Option) {
+		if pageSize > 0 {
+			o.PageSize = pageSize
+		}
+	}
+}
+
+func WithIncludeDeleted(includeDeleted bool) OptionFunc {
+	return func(o *Option) {
+		o.IncludeDeleted = includeDeleted
+	}
+}
+
+func WithCacheWrite(withCacheWrite bool) OptionFunc {
+	return func(o *Option) {
+		o.WithCacheWrite = withCacheWrite
+	}
+}
+
+func WithCacheTTL(cacheTTL time.Duration) OptionFunc {
+	return func(o *Option) {
+		if cacheTTL >= 0 {
+			o.CacheTTL = cacheTTL
+		}
+	}
+}
+
+func WithNotFoundCacheTTL(notFoundCacheTTL time.Duration) OptionFunc {
+	return func(o *Option) {
+		if notFoundCacheTTL >= 0 {
+			o.NotFoundCacheTTL = notFoundCacheTTL
+		}
+	}
+}