/// <summary>
/// If the database contains an entry for "key" return the value,
/// otherwise return null.
/// </summary>
public unsafe byte[] Get(byte[] key, ReadOptions options)
{
IntPtr error;
IntPtr lengthPtr;
var valuePtr = LevelDBInterop.leveldb_get(this.Handle, options.Handle, key, (IntPtr)key.Length, out lengthPtr, out error);
LevelDBException.Check(error);
if (valuePtr == IntPtr.Zero)
{
return(null);
}
try {
var length = (long)lengthPtr;
var value = new byte[length];
var valueNative = (byte *)valuePtr.ToPointer();
for (long i = 0; i < length; ++i)
{
value[i] = valueNative[i];
}
return(value);
} finally {
LevelDBInterop.leveldb_free(valuePtr);
GC.KeepAlive(options);
GC.KeepAlive(this);
}
}
/// <summary>
/// If an error has occurred, throw it.
/// </summary>
void Throw()
{
IntPtr error;
LevelDBInterop.leveldb_iter_get_error(Handle, out error);
LevelDBException.Check(error);
GC.KeepAlive(this);
}
/// <summary>
/// Destroy the contents of the specified database.
/// Be very careful using this method.
/// Options should not be modified after calling this method.
/// </summary>
public static void Destroy(string name, Options options)
{
IntPtr error;
LevelDBInterop.leveldb_destroy_db(options.Handle, name, out error);
LevelDBException.Check(error);
GC.KeepAlive(options);
}
/// <summary>
/// Open the database with the specified "name".
/// Options should not be modified after calling this method.
/// </summary>
public DB(string name, Options options)
{
Options = options ?? new Options();
IntPtr error;
Handle = LevelDBInterop.leveldb_open(Options.Handle, name, out error);
LevelDBException.Check(error);
GC.KeepAlive(Options);
}
/// <summary>
/// Remove the database entry (if any) for "key".
/// It is not an error if "key" did not exist in the database.
/// </summary>
public void Delete(byte[] key, WriteOptions options)
{
IntPtr error;
LevelDBInterop.leveldb_delete(this.Handle, options.Handle, key, (IntPtr)key.Length, out error);
LevelDBException.Check(error);
GC.KeepAlive(options);
GC.KeepAlive(this);
}
/// <summary>
/// Set the database entry for "key" to "value".
/// </summary>
public void Put(byte[] key, byte[] value, WriteOptions options)
{
IntPtr error;
LevelDBInterop.leveldb_put(this.Handle, options.Handle, key, (IntPtr)key.Length, value, (IntPtr)value.LongLength, out error);
LevelDBException.Check(error);
GC.KeepAlive(options);
GC.KeepAlive(this);
}
public void Write(WriteBatch batch, WriteOptions options)
{
IntPtr error;
LevelDBInterop.leveldb_write(this.Handle, options.Handle, batch.Handle, out error);
LevelDBException.Check(error);
GC.KeepAlive(batch);
GC.KeepAlive(options);
GC.KeepAlive(this);
}
