### Perform database reads and writes

Source: https://rocksdb.org/docs

Use Get, Put, and Delete methods to manipulate key-value pairs.

```cpp
std::string value;
rocksdb::Status s = db->Get(rocksdb::ReadOptions(), key1, &value);
if (s.ok()) s = db->Put(rocksdb::WriteOptions(), key2, value);
if (s.ok()) s = db->Delete(rocksdb::WriteOptions(), key1);
```

--------------------------------

### Open a RocksDB database

Source: https://rocksdb.org/docs

Initialize a database connection and create the directory if it does not exist.

```cpp
#include <assert>
#include "rocksdb/db.h"

rocksdb::DB* db;
rocksdb::Options options;
options.create_if_missing = true;
rocksdb::Status status =
  rocksdb::DB::Open(options, "/tmp/testdb", &db);
assert(status.ok());
...
```

--------------------------------

### Configure database error on existence

Source: https://rocksdb.org/docs

Set the options to trigger an error if the database directory already exists.

```cpp
options.error_if_exists = true;
```

--------------------------------

### Handle RocksDB status

Source: https://rocksdb.org/docs

Check the result of a database operation and output error messages if the operation fails.

```cpp
rocksdb::Status s = ...;
if (!s.ok()) cerr << s.ToString() << endl;
```

--------------------------------

### Close a RocksDB database

Source: https://rocksdb.org/docs

Release database resources by deleting the database object.

```cpp
/* open the db as described above */
/* do something with db */
delete db;
```

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