Add example of OwningRows using Ouroboros

Cargo.toml

@@ -132,6 +132,7 @@ lazy_static = "1.4"
 regex = "1.5.5"
 uuid = { version = "1.0", features = ["v4"] }
 unicase = "2.6.0"
+ouroboros = "0.18"
 # Use `bencher` over criterion because it builds much faster and we don't have
 # many benchmarks
 bencher = "0.1"

examples/owning_rows.rs

@@ -0,0 +1,29 @@
+extern crate rusqlite;
+
+use ouroboros::self_referencing;
+use rusqlite::{CachedStatement, Connection, Result, Rows};
+
+#[self_referencing]
+struct OwningRows<'conn> {
+    stmt: CachedStatement<'conn>,
+    #[borrows(mut stmt)]
+    #[covariant]
+    rows: Rows<'this>,
+}
+
+fn main() -> Result<()> {
+    let conn = Connection::open_in_memory()?;
+    let stmt = conn.prepare_cached("SELECT 1")?;
+    let mut or = OwningRowsTryBuilder {
+        stmt,
+        rows_builder: |s| s.query([]),
+    }
+    .try_build()?;
+    or.with_rows_mut(|rows| -> Result<()> {
+        while let Some(row) = rows.next()? {
+            assert_eq!(Ok(1), row.get(0));
+        }
+        Ok(())
+    })?;
+    Ok(())
+}