/// <summary>
/// 查询某个Key
/// </summary>
/// <typeparam name="T">值泛型</typeparam>
/// <param name="db">待查询db</param>
/// <param name="options">读选项</param>
/// <param name="prefix">待查询前缀</param>
/// <param name="key">待查询Key</param>
/// <param name="resultSelector">值处理回调函数</param>
/// <returns>T</returns>
public static T Get <T>(this DB db, ReadOptions options, byte prefix, ISerializable key, Func <Slice, T> resultSelector)
{
return(resultSelector(db.Get(options, SliceBuilder.Begin(prefix).Add(key))));
}
/// <summary>
/// 查询前缀匹配的元素
/// </summary>
/// <typeparam name="T">值泛型</typeparam>
/// <param name="db">待查询db</param>
/// <param name="options">读选项</param>
/// <param name="prefix">待查询前缀</param>
/// <returns>T列表</returns>
public static IEnumerable <T> Find <T>(this DB db, ReadOptions options, byte prefix) where T : class, ISerializable, new()
{
return(Find(db, options, SliceBuilder.Begin(prefix), (k, v) => v.ToArray().AsSerializable <T>()));
}
/// <summary>
/// 查询某个Key
/// </summary>
/// <typeparam name="T">值泛型</typeparam>
/// <param name="db">待查询db</param>
/// <param name="options">读选项</param>
/// <param name="prefix">待查询前缀</param>
/// <param name="key">待查询Key</param>
/// <returns>T</returns>
public static T Get <T>(this DB db, ReadOptions options, byte prefix, ISerializable key) where T : class, ISerializable, new()
{
return(db.Get(options, SliceBuilder.Begin(prefix).Add(key)).ToArray().AsSerializable <T>());
}
public Iterator NewIterator(ReadOptions options)
{
return(new Iterator(Native.leveldb_create_iterator(handle, options.handle)));
}