/// <summary>
/// 当某个迁移操作升级完成后，为它添加相应的历史记录。
/// </summary>
/// <param name="database"></param>
/// <param name="migration"></param>
/// <returns></returns>
internal Result AddAsExecuted(string database, DbMigration migration)
{
var history = new HistoryItem()
{
IsGenerated = false,
TimeId = migration.TimeId,
Description = migration.Description,
MigrationClass = migration.GetType().AssemblyQualifiedName,
};
if (migration.MigrationType == MigrationType.AutoMigration)
{
history.IsGenerated = true;
history.MigrationContent = SerializationHelper.XmlSerialize(migration);
}
return this.AddHistoryCore(database, history);
}
protected override Result AddHistoryCore(string database, HistoryItem history)
{
var item = new DbMigrationHistory();
item.Database = database;
item.TimeId = history.TimeId.Ticks;
item.Description = history.Description;
item.IsGenerated = history.IsGenerated;
item.MigrationClass = history.MigrationClass;
item.MigrationContent = history.MigrationContent;
try
{
this._historyRepo.Save(item);
return true;
}
catch (Exception ex)
{
return "添加数据库更新日志 时出错：" + ex.Message;
}
}
/// <summary>
/// 从历史记录中还原迁移对象
/// </summary>
/// <param name="history"></param>
/// <returns></returns>
internal DbMigration TryRestore(HistoryItem history)
{
Type type = null;
try
{
type = Type.GetType(history.MigrationClass);
}
catch (TypeLoadException)
{
//如果当前这个类已经不存在了，无法还原，则直接返回 null，跳过该项。
return null;
}
//如果这个类型已经被变更了，或者找不到，则直接返回 null
if (type == null) { return null; }
DbMigration migration = null;
if (history.IsGenerated)
{
migration = SerializationHelper.XmlDeserialize(type, history.MigrationContent).CastTo<DbMigration>();
(migration as MigrationOperation).RuntimeTimeId = history.TimeId;
}
else
{
migration = Activator.CreateInstance(type, true).CastTo<DbMigration>();
}
return migration;
}
internal Result Remove(string database, HistoryItem history)
{
return this.RemoveHistoryCore(database, history);
}
/// <summary> /// 为指定数据库删除某条历史记录。 /// </summary> /// <param name="database"></param> /// <param name="history"></param> /// <returns></returns> protected abstract Result RemoveHistoryCore(string database, HistoryItem history);
/// <summary> /// 为指定数据库删除某条历史记录。 /// </summary> /// <param name="database"></param> /// <param name="history"></param> /// <returns></returns> protected abstract Result RemoveHistoryCore(string database, HistoryItem history);
internal Result Remove(string database, HistoryItem history)
{
return(this.RemoveHistoryCore(database, history));
}
protected override Result RemoveHistoryCore(string database, HistoryItem history)
{
var item = history.DataObject.CastTo<DbMigrationHistory>();
item.PersistenceStatus = PersistenceStatus.Deleted;
try
{
this._historyRepo.Save(item);
return true;
}
catch (Exception ex)
{
return "添加数据库更新日志 时出错：" + ex.Message;
}
}