Add a way to open the database

src/environment.rs

@@ -2,8 +2,11 @@ use crate::database::raw::{RawTable, RawTableTryBuilder};
 use crate::database::wrapped::WrappedTable;
 use crate::wrapper::{ByteWrapper, ZeroCopyByteWrapper};
 use anyhow::{ensure, Context};
-use libmdbx::{DatabaseFlags, Environment, Transaction, TransactionKind, WriteMap, RO, RW};
+use libmdbx::{
+    DatabaseFlags, Environment, EnvironmentFlags, Transaction, TransactionKind, WriteMap, RO, RW,
+};
 use std::marker::PhantomData;
+use std::path::Path;
 use std::sync::Arc;
 
 pub struct Env {
@@ -11,6 +14,20 @@ pub struct Env {
 }
 
 impl Env {
+    pub fn open(path: &Path) -> anyhow::Result<Env> {
+        let mut flags = EnvironmentFlags::default();
+        flags.no_sub_dir = true;
+
+        let environment = Environment::new()
+            .set_max_dbs(256)
+            .set_flags(flags)
+            .open(path)?;
+
+        Ok(Env {
+            mdbx_env: Arc::new(environment),
+        })
+    }
+
     pub fn open_raw_table<K: ZeroCopyByteWrapper + ?Sized, V: ZeroCopyByteWrapper + ?Sized>(
         &self,
         name: Option<&str>,