Module instance_cache 

Database instance cache (DuckDB 1.5.0+).

An InstanceCache lets multiple connections share a single underlying DuckDB instance for a given database path. Opening the same path twice through the cache returns handles backed by the same instance, which avoids the “database is already open in another process/instance” conflict and saves the cost of re-initialising the database.

This is primarily useful for extensions or host integrations that open secondary databases on behalf of a query.

Example

use quack_rs::instance_cache::InstanceCache;

let cache = InstanceCache::new();
// Returns a duckdb_database the caller owns and must close with duckdb_close.
let db = cache.get_or_create(c"my.db", None)?;

Structs

InstanceCache

RAII wrapper for a duckdb_instance_cache.