feat: derive Copy and Clone on Queries (#11)

## Summary
- Derive `Copy` and `Clone` on `Queries<E>` so it inherits those traits
from `E`
- Enables ergonomic use with cheap-to-clone executors like `&Pool`

## Test plan
- [x] `cargo test` — 21 codegen snapshots + lib tests pass
- [x] `cargo check` on all four examples passes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jrandolf

examples/advanced-types/src/queries.rs

@@ -1,10 +1,7 @@
-// Code generated by sqlc-gen-sqlx v0.1.1. DO NOT EDIT.
+// Code generated by sqlc-gen-sqlx v0.1.4. DO NOT EDIT.
 // sqlc version: v1.30.0
 
-#![allow(
-    dead_code,
-    reason = "generated queries may expose items a caller does not use"
-)]
+#![allow(dead_code, reason = "generated queries may expose items a caller does not use")]
 
 const GET_EVENT: &str = "SELECT id, name, flags, event_window FROM events WHERE id = $1";
 #[derive(Debug, Clone, sqlx::FromRow)]
@@ -55,6 +52,7 @@ impl<T: AsExecutor + ?Sized> AsExecutor for &mut T {
         (**self).as_executor()
     }
 }
+#[derive(Copy, Clone)]
 pub struct Queries<E> {
     db: E,
 }

examples/basic/src/queries.rs

@@ -1,10 +1,7 @@
-// Code generated by sqlc-gen-sqlx v0.1.1. DO NOT EDIT.
+// Code generated by sqlc-gen-sqlx v0.1.4. DO NOT EDIT.
 // sqlc version: v1.30.0
 
-#![allow(
-    dead_code,
-    reason = "generated queries may expose items a caller does not use"
-)]
+#![allow(dead_code, reason = "generated queries may expose items a caller does not use")]
 
 const GET_AUTHOR: &str = "SELECT id, name, bio FROM authors WHERE id = $1";
 #[derive(Debug, Clone, sqlx::FromRow)]
@@ -25,8 +22,7 @@ pub struct CreateAuthorParams {
     pub name: String,
     pub bio: Option<String>,
 }
-const CREATE_AUTHOR: &str =
-    "INSERT INTO authors (name, bio) VALUES ($1, $2) RETURNING id, name, bio";
+const CREATE_AUTHOR: &str = "INSERT INTO authors (name, bio) VALUES ($1, $2) RETURNING id, name, bio";
 #[derive(Debug, Clone, sqlx::FromRow)]
 pub struct CreateAuthorRow {
     pub id: i64,
@@ -68,6 +64,7 @@ impl<T: AsExecutor + ?Sized> AsExecutor for &mut T {
         (**self).as_executor()
     }
 }
+#[derive(Copy, Clone)]
 pub struct Queries<E> {
     db: E,
 }
@@ -102,10 +99,7 @@ impl<E: AsExecutor> Queries<E> {
             .await
     }
     pub async fn delete_author(&mut self, id: i64) -> Result<(), sqlx::Error> {
-        sqlx::query(DELETE_AUTHOR)
-            .bind(id)
-            .execute(self.db.as_executor())
-            .await?;
+        sqlx::query(DELETE_AUTHOR).bind(id).execute(self.db.as_executor()).await?;
         Ok(())
     }
     pub async fn delete_author_rows(&mut self, id: i64) -> Result<u64, sqlx::Error> {

examples/batch/src/queries.rs

@@ -1,10 +1,7 @@
-// Code generated by sqlc-gen-sqlx v0.1.1. DO NOT EDIT.
+// Code generated by sqlc-gen-sqlx v0.1.4. DO NOT EDIT.
 // sqlc version: v1.30.0
 
-#![allow(
-    dead_code,
-    reason = "generated queries may expose items a caller does not use"
-)]
+#![allow(dead_code, reason = "generated queries may expose items a caller does not use")]
 
 const BATCH_GET_AUTHOR: &str = "SELECT id, name, bio FROM authors WHERE id = $1";
 #[derive(Debug, Clone, sqlx::FromRow)]
@@ -47,6 +44,7 @@ impl<T: AsExecutor + ?Sized> AsExecutor for &mut T {
         (**self).as_executor()
     }
 }
+#[derive(Copy, Clone)]
 pub struct Queries<E> {
     db: E,
 }
@@ -62,7 +60,9 @@ impl<E: AsExecutor> Queries<E> {
     pub fn batch_get_author<'a, I>(
         &'a mut self,
         items: I,
-    ) -> impl futures_core::stream::Stream<Item = Result<BatchGetAuthorRow, sqlx::Error>> + 'a
+    ) -> impl futures_core::stream::Stream<
+        Item = Result<BatchGetAuthorRow, sqlx::Error>,
+    > + 'a
     where
         I: IntoIterator<Item = i64> + 'a,
         I::IntoIter: 'a,

examples/enums/src/queries.rs

@@ -1,10 +1,7 @@
-// Code generated by sqlc-gen-sqlx v0.1.1. DO NOT EDIT.
+// Code generated by sqlc-gen-sqlx v0.1.4. DO NOT EDIT.
 // sqlc version: v1.30.0
 
-#![allow(
-    dead_code,
-    reason = "generated queries may expose items a caller does not use"
-)]
+#![allow(dead_code, reason = "generated queries may expose items a caller does not use")]
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, sqlx::Type)]
 #[sqlx(type_name = "status")]
@@ -69,6 +66,7 @@ impl<T: AsExecutor + ?Sized> AsExecutor for &mut T {
         (**self).as_executor()
     }
 }
+#[derive(Copy, Clone)]
 pub struct Queries<E> {
     db: E,
 }
@@ -96,7 +94,10 @@ impl<E: AsExecutor> Queries<E> {
             .fetch_all(self.db.as_executor())
             .await
     }
-    pub async fn create_user(&mut self, arg: CreateUserParams) -> Result<(), sqlx::Error> {
+    pub async fn create_user(
+        &mut self,
+        arg: CreateUserParams,
+    ) -> Result<(), sqlx::Error> {
         sqlx::query(CREATE_USER)
             .bind(arg.name)
             .bind(arg.status)

src/codegen/mod.rs

@@ -92,6 +92,7 @@ pub fn generate(request: &GenerateRequestView<'_>, config: &Config) -> Result<St
             }
         }
 
+        #[derive(Copy, Clone)]
         pub struct Queries<E> {
             db: E,
         }

tests/snapshots/codegen__batch_dynamic_slice_param.snap

@@ -47,6 +47,7 @@ impl<T: AsExecutor + ?Sized> AsExecutor for &mut T {
         (**self).as_executor()
     }
 }
+#[derive(Copy, Clone)]
 pub struct Queries<E> {
     db: E,
 }

tests/snapshots/codegen__batchexec.snap

@@ -41,6 +41,7 @@ impl<T: AsExecutor + ?Sized> AsExecutor for &mut T {
         (**self).as_executor()
     }
 }
+#[derive(Copy, Clone)]
 pub struct Queries<E> {
     db: E,
 }

tests/snapshots/codegen__batchmany.snap

@@ -47,6 +47,7 @@ impl<T: AsExecutor + ?Sized> AsExecutor for &mut T {
         (**self).as_executor()
     }
 }
+#[derive(Copy, Clone)]
 pub struct Queries<E> {
     db: E,
 }

tests/snapshots/codegen__batchone.snap

@@ -47,6 +47,7 @@ impl<T: AsExecutor + ?Sized> AsExecutor for &mut T {
         (**self).as_executor()
     }
 }
+#[derive(Copy, Clone)]
 pub struct Queries<E> {
     db: E,
 }

tests/snapshots/codegen__composite_types.snap

@@ -47,6 +47,7 @@ impl<T: AsExecutor + ?Sized> AsExecutor for &mut T {
         (**self).as_executor()
     }
 }
+#[derive(Copy, Clone)]
 pub struct Queries<E> {
     db: E,
 }