chore(examples): fix db-access example with RO provider (#11670)

Co-authored-by: Matthias Seitz <[email protected]>

examples/db-access/src/main.rs

@@ -1,14 +1,15 @@
 use alloy_primitives::{Address, Sealable, B256};
 use alloy_rpc_types::{Filter, FilteredParams};
 use reth_chainspec::ChainSpecBuilder;
+use reth_db::{open_db_read_only, DatabaseEnv};
 use reth_node_ethereum::EthereumNode;
 use reth_node_types::NodeTypesWithDBAdapter;
 use reth_primitives::SealedHeader;
 use reth_provider::{
     providers::StaticFileProvider, AccountReader, BlockReader, BlockSource, HeaderProvider,
     ProviderFactory, ReceiptProvider, StateProvider, TransactionsProvider,
 };
-use std::path::Path;
+use std::{path::Path, sync::Arc};
 
 // Providers are zero cost abstractions on top of an opened MDBX Transaction
 // exposing a familiar API to query the chain's information without requiring knowledge
@@ -20,17 +21,16 @@ fn main() -> eyre::Result<()> {
     // Opens a RO handle to the database file.
     let db_path = std::env::var("RETH_DB_PATH")?;
     let db_path = Path::new(&db_path);
+    let db = open_db_read_only(db_path.join("db").as_path(), Default::default())?;
 
     // Instantiate a provider factory for Ethereum mainnet using the provided DB.
     // TODO: Should the DB version include the spec so that you do not need to specify it here?
     let spec = ChainSpecBuilder::mainnet().build();
-    let factory =
-        ProviderFactory::<NodeTypesWithDBAdapter<EthereumNode, _>>::new_with_database_path(
-            db_path,
-            spec.into(),
-            Default::default(),
-            StaticFileProvider::read_only(db_path.join("static_files"), false)?,
-        )?;
+    let factory = ProviderFactory::<NodeTypesWithDBAdapter<EthereumNode, Arc<DatabaseEnv>>>::new(
+        db.into(),
+        spec.into(),
+        StaticFileProvider::read_only(db_path.join("static_files"), true)?,
+    );
 
     // This call opens a RO transaction on the database. To write to the DB you'd need to call
     // the `provider_rw` function and look for the `Writer` variants of the traits.