first commit

internal/mysqldao/like.go

@@ -0,0 +1,102 @@
+package mysqldao
+
+import (
+	"context"
+
+	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/global"
+	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/internal/mysqlmodel"
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+// LikeDao 点赞数据访问
+type LikeDao struct {
+	db *gorm.DB
+}
+
+// NewLikeDao 创建点赞 DAO
+func NewLikeDao() *LikeDao {
+	return &LikeDao{db: global.MysqlEngine}
+}
+
+// LikeCreate 创建点赞记录
+func (d *LikeDao) LikeCreate(ctx context.Context, like *mysqlmodel.Like) error {
+	ctx, span := global.Tracer.Start(ctx, "mysqldao.LikeCreate")
+	defer span.End()
+
+	if err := d.db.WithContext(ctx).Create(like).Error; err != nil {
+		span.RecordError(err)
+		return err
+	}
+	return nil
+}
+
+// LikeUpsertOn 点赞幂等写入：唯一索引冲突时仅置 status=1，防并发重复插入。
+func (d *LikeDao) LikeUpsertOn(ctx context.Context, like *mysqlmodel.Like) error {
+	ctx, span := global.Tracer.Start(ctx, "mysqldao.LikeUpsertOn")
+	defer span.End()
+
+	if err := d.db.WithContext(ctx).Clauses(clause.OnConflict{
+		Columns:   []clause.Column{{Name: "like_type"}, {Name: "target_id"}, {Name: "user_id"}},
+		DoUpdates: clause.AssignmentColumns([]string{"status"}),
+	}).Create(like).Error; err != nil {
+		span.RecordError(err)
+		return err
+	}
+	return nil
+}
+
+// LikeUpdateStatus 更新点赞状态（1=已点赞 0=已取消）
+func (d *LikeDao) LikeUpdateStatus(ctx context.Context, id int64, status int8) error {
+	ctx, span := global.Tracer.Start(ctx, "mysqldao.LikeUpdateStatus")
+	defer span.End()
+
+	if err := d.db.WithContext(ctx).Model(&mysqlmodel.Like{}).Where("id = ?", id).UpdateColumn("status", status).Error; err != nil {
+		span.RecordError(err)
+		return err
+	}
+	return nil
+}
+
+// LikeGetByTargetAndUser 查询用户在目标上的点赞记录
+func (d *LikeDao) LikeGetByTargetAndUser(ctx context.Context, likeType int8, targetID, userID int64) (*mysqlmodel.Like, error) {
+	ctx, span := global.Tracer.Start(ctx, "mysqldao.LikeGetByTargetAndUser")
+	defer span.End()
+
+	var like mysqlmodel.Like
+	if err := d.db.WithContext(ctx).Where("like_type = ? AND target_id = ? AND user_id = ?", likeType, targetID, userID).First(&like).Error; err != nil {
+		span.RecordError(err)
+		return nil, err
+	}
+	return &like, nil
+}
+
+// LikeCountByTarget 统计目标点赞数（仅 status=1）
+func (d *LikeDao) LikeCountByTarget(ctx context.Context, likeType int8, targetID int64) (int64, error) {
+	ctx, span := global.Tracer.Start(ctx, "mysqldao.LikeCountByTarget")
+	defer span.End()
+
+	var count int64
+	if err := d.db.WithContext(ctx).Model(&mysqlmodel.Like{}).
+		Where("like_type = ? AND target_id = ? AND status = ?", likeType, targetID, int8(1)).
+		Count(&count).Error; err != nil {
+		span.RecordError(err)
+		return 0, err
+	}
+	return count, nil
+}
+
+// LikeListUserIDsByTarget 查询点赞用户ID列表（仅 status=1）
+func (d *LikeDao) LikeListUserIDsByTarget(ctx context.Context, likeType int8, targetID int64) ([]int64, error) {
+	ctx, span := global.Tracer.Start(ctx, "mysqldao.LikeListUserIDsByTarget")
+	defer span.End()
+
+	var ids []int64
+	if err := d.db.WithContext(ctx).Model(&mysqlmodel.Like{}).
+		Where("like_type = ? AND target_id = ? AND status = ?", likeType, targetID, int8(1)).
+		Pluck("user_id", &ids).Error; err != nil {
+		span.RecordError(err)
+		return nil, err
+	}
+	return ids, nil
+}