public void Enumerator()
{
var writeOptions = Native.leveldb_writeoptions_create();
Native.leveldb_put(Database, writeOptions, "key1", "value1");
Native.leveldb_put(Database, writeOptions, "key2", "value2");
Native.leveldb_put(Database, writeOptions, "key3", "value3");
var entries = new List <KeyValuePair <string, string> >();
var readOptions = Native.leveldb_readoptions_create();
IntPtr iter = Native.leveldb_create_iterator(Database, readOptions);
for (Native.leveldb_iter_seek_to_first(iter);
(int)Native.leveldb_iter_valid(iter) != 0;
Native.leveldb_iter_next(iter))
{
string key = Native.leveldb_iter_key(iter);
string value = Native.leveldb_iter_value(iter);
var entry = new KeyValuePair <string, string>(key, value);
entries.Add(entry);
}
Native.leveldb_iter_destroy(iter);
Native.leveldb_readoptions_destroy(readOptions);
Assert.AreEqual(3, entries.Count);
Assert.AreEqual("key1", entries[0].Key);
Assert.AreEqual("value1", entries[0].Value);
Assert.AreEqual("key2", entries[1].Key);
Assert.AreEqual("value2", entries[1].Value);
Assert.AreEqual("key3", entries[2].Key);
Assert.AreEqual("value3", entries[2].Value);
Native.leveldb_writeoptions_destroy(writeOptions);
}
public static void Dump(IntPtr db)
{
var options = Native.leveldb_readoptions_create();
IntPtr iter = Native.leveldb_create_iterator(db, options);
for (Native.leveldb_iter_seek_to_first(iter);
Native.leveldb_iter_valid(iter);
Native.leveldb_iter_next(iter))
{
byte[] key = Native.leveldb_iter_key_raw(iter);
byte[] value = Native.leveldb_iter_value_raw(iter);
Console.WriteLine("'{0}' => '{1}'", key, value);
}
Native.leveldb_iter_destroy(iter);
}
public void IsValid()
{
var writeOptions = Native.leveldb_writeoptions_create();
Native.leveldb_put(Database, writeOptions, "key1", "value1");
var readOptions = Native.leveldb_readoptions_create();
IntPtr iter = Native.leveldb_create_iterator(Database, readOptions);
Native.leveldb_iter_seek_to_last(iter);
Assert.IsTrue(Native.leveldb_iter_valid(iter));
Native.leveldb_iter_next(iter);
Assert.IsFalse(Native.leveldb_iter_valid(iter));
}
public Iterator(DB db, ReadOptions readOptions)
{
if (db == null)
{
throw new ArgumentNullException("db");
}
DB = db;
// keep reference so it doesn't get GCed
ReadOptions = readOptions;
if (ReadOptions == null)
{
ReadOptions = new ReadOptions();
}
Handle = Native.leveldb_create_iterator(db.Handle, ReadOptions.Handle);
IsFirstMove = true;
}
public IEnumerator <KeyValuePair <string, string> > GetEnumerator()
{
CheckDisposed();
var options = new ReadOptions();
IntPtr iter = IntPtr.Zero;
try {
iter = Native.leveldb_create_iterator(Handle, options.Handle);
for (Native.leveldb_iter_seek_to_first(iter);
Native.leveldb_iter_valid(iter);
Native.leveldb_iter_next(iter))
{
string key = Native.leveldb_iter_key(iter);
string value = Native.leveldb_iter_value(iter);
var kvp = new KeyValuePair <string, string>(key, value);
yield return(kvp);
}
} finally {
if (iter != IntPtr.Zero)
{
Native.leveldb_iter_destroy(iter);
}
}
}