feat: get storage by id api

internal/db/storage.go

@@ -0,0 +1,50 @@
+package db
+
+import (
+	"github.com/alist-org/alist/v3/internal/model"
+	"github.com/pkg/errors"
+)
+
+// why don't need `cache` for storage?
+// because all storage store in `operations.storagesMap`
+// the most of the read operation is from `operations.storagesMap`
+// just for persistence in database
+
+// CreateStorage just insert storage to database
+func CreateStorage(storage *model.Storage) error {
+	return errors.WithStack(db.Create(storage).Error)
+}
+
+// UpdateStorage just update storage in database
+func UpdateStorage(storage *model.Storage) error {
+	return errors.WithStack(db.Save(storage).Error)
+}
+
+// DeleteStorageById just delete storage from database by id
+func DeleteStorageById(id uint) error {
+	return errors.WithStack(db.Delete(&model.Storage{}, id).Error)
+}
+
+// GetStorages Get all storages from database order by index
+func GetStorages(pageIndex, pageSize int) ([]model.Storage, int64, error) {
+	storageDB := db.Model(&model.Storage{})
+	var count int64
+	if err := storageDB.Count(&count).Error; err != nil {
+		return nil, 0, errors.Wrapf(err, "failed get storages count")
+	}
+	var storages []model.Storage
+	if err := storageDB.Order(columnName("index")).Offset((pageIndex - 1) * pageSize).Limit(pageSize).Find(&storages).Error; err != nil {
+		return nil, 0, errors.WithStack(err)
+	}
+	return storages, count, nil
+}
+
+// GetStorageById Get Storage by id, used to update storage usually
+func GetStorageById(id uint) (*model.Storage, error) {
+	var storage model.Storage
+	storage.ID = id
+	if err := db.First(&storage).Error; err != nil {
+		return nil, errors.WithStack(err)
+	}
+	return &storage, nil
+}