public void Snapshot()
{
// modify db
var writeOptions = Native.leveldb_writeoptions_create();
Native.leveldb_put(Database, writeOptions, "key1", "value1");
Native.leveldb_writeoptions_destroy(writeOptions);
// create snapshot
var snapshot = Native.leveldb_create_snapshot(Database);
// modify db again
writeOptions = Native.leveldb_writeoptions_create();
Native.leveldb_put(Database, writeOptions, "key2", "value2");
Native.leveldb_writeoptions_destroy(writeOptions);
// read from snapshot
var readOptions = Native.leveldb_readoptions_create();
Native.leveldb_readoptions_set_snapshot(readOptions, snapshot);
var val1 = Native.leveldb_get(Database, readOptions, "key1");
Assert.AreEqual("value1", val1);
var val2 = Native.leveldb_get(Database, readOptions, "key2");
Assert.IsNull(val2);
Native.leveldb_readoptions_destroy(readOptions);
// release snapshot
Native.leveldb_release_snapshot(Database, snapshot);
snapshot = IntPtr.Zero;
}
public void WriteBatch()
{
var writeOptions = Native.leveldb_writeoptions_create();
Native.leveldb_put(Database, writeOptions, "key1", "value1");
var writeBatch = Native.leveldb_writebatch_create();
Native.leveldb_writebatch_delete(writeBatch, "key1");
Native.leveldb_writebatch_put(writeBatch, "key2", "value2");
Native.leveldb_write(Database, writeOptions, writeBatch);
var readOptions = Native.leveldb_readoptions_create();
var value1 = Native.leveldb_get(Database, readOptions, "key1");
Assert.IsNull(value1);
var value2 = Native.leveldb_get(Database, readOptions, "key2");
Assert.AreEqual("value2", value2);
Native.leveldb_writebatch_delete(writeBatch, "key2");
Native.leveldb_writebatch_clear(writeBatch);
Native.leveldb_write(Database, writeOptions, writeBatch);
value2 = Native.leveldb_get(Database, readOptions, "key2");
Assert.AreEqual("value2", value2);
Native.leveldb_writebatch_destroy(writeBatch);
Native.leveldb_writeoptions_destroy(writeOptions);
Native.leveldb_writeoptions_destroy(readOptions);
}
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 void Get()
{
var options = Native.leveldb_readoptions_create();
Native.leveldb_put(Database, options, "key1", "value1");
var value1 = Native.leveldb_get(Database, options, "key1");
Assert.AreEqual("value1", value1);
Native.leveldb_put(Database, options, "key2", "value2");
var value2 = Native.leveldb_get(Database, options, "key2");
Assert.AreEqual("value2", value2);
Native.leveldb_put(Database, options, "key3", "value3");
var value3 = Native.leveldb_get(Database, options, "key3");
Assert.AreEqual("value3", value3);
// verify checksums
Native.leveldb_readoptions_set_verify_checksums(options, true);
value1 = Native.leveldb_get(Database, options, "key1");
Assert.AreEqual("value1", value1);
// no fill cache
Native.leveldb_readoptions_set_fill_cache(options, false);
value2 = Native.leveldb_get(Database, options, "key2");
Assert.AreEqual("value2", value2);
Native.leveldb_readoptions_destroy(options);
}
public void Put()
{
var options = Native.leveldb_writeoptions_create();
Native.leveldb_put(Database, options, "key1", "value1");
Native.leveldb_put(Database, options, "key2", "value2");
Native.leveldb_put(Database, options, "key3", "value3");
}
public void Put(WriteOptions options, string key, string value)
{
CheckDisposed();
if (options == null)
{
options = new WriteOptions();
}
Native.leveldb_put(Handle, options.Handle, key, value, encoding);
}
public void Put(WriteOptions options, byte[] key, byte[] value)
{
CheckDisposed();
if (options == null)
{
options = new WriteOptions();
}
Native.leveldb_put(Handle, options.Handle, key, value);
}
public void Put()
{
var options = Native.leveldb_writeoptions_create();
Native.leveldb_put(Database, options, "key1", "value1");
Native.leveldb_put(Database, options, "key2", "value2");
Native.leveldb_put(Database, options, "key3", "value3");
// sync
Native.leveldb_writeoptions_set_sync(options, true);
Native.leveldb_put(Database, options, "key4", "value4");
}
public void Delete()
{
var options = Native.leveldb_writeoptions_create();
Native.leveldb_put(Database, options, "key1", "value1");
var value1 = Native.leveldb_get(Database, options, "key1");
Assert.AreEqual("value1", value1);
Native.leveldb_delete(Database, options, "key1");
value1 = Native.leveldb_get(Database, options, "key1");
Assert.IsNull(value1);
}
public static void leveldb_put(IntPtr db,
IntPtr writeOptions,
byte[] key,
byte[] value)
{
string error;
var keyLength = GetArrayLength(key);
var valueLength = GetArrayLength(value);
Native.leveldb_put(db, writeOptions,
key, keyLength,
value, valueLength, out error);
CheckError(error);
}
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 void Delete()
{
var writeOptions = Native.leveldb_writeoptions_create();
Native.leveldb_put(Database, writeOptions, "key1", "value1");
var readOptions = Native.leveldb_readoptions_create();
var value1 = Native.leveldb_get(Database, readOptions, "key1");
Assert.AreEqual("value1", value1);
Native.leveldb_delete(Database, writeOptions, "key1");
value1 = Native.leveldb_get(Database, readOptions, "key1");
Assert.IsNull(value1);
Native.leveldb_writeoptions_destroy(writeOptions);
Native.leveldb_readoptions_destroy(readOptions);
}
public void Get()
{
var options = Native.leveldb_readoptions_create();
Native.leveldb_put(Database, options, "key1", "value1");
var value1 = Native.leveldb_get(Database, options, "key1");
Assert.AreEqual("value1", value1);
Native.leveldb_put(Database, options, "key2", "value2");
var value2 = Native.leveldb_get(Database, options, "key2");
Assert.AreEqual("value2", value2);
Native.leveldb_put(Database, options, "key3", "value3");
var value3 = Native.leveldb_get(Database, options, "key3");
Assert.AreEqual("value3", value3);
}
