Function Java_sz_1orm_1java_SzOrmPool_poolNew 

#[unsafe(no_mangle)]
pub extern "system" fn Java_sz_1orm_1java_SzOrmPool_poolNew<'local>(
    unowned_env: EnvUnowned<'local>,
    _class: JClass<'local>,
    dsn: JString<'local>,
    max_connections: jint,
) -> jlong

JNI entry: Create connection pool (real creation, SQLite backend)

Returns handle (jlong), 0 indicates failure.