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Chapter 12 — Tri-dialect + cross-cutting

2 live tests against a docker MySQL 8.0 container, exercising the same cookbook model that PG tests use through the dialect-agnostic Pool + save_pool / fetch_pool ORM API. Run with:

docker run -d --name rustango-mysql \
  -e MYSQL_ROOT_PASSWORD=rustango -e MYSQL_DATABASE=cookbook_blog_my \
  -e MYSQL_USER=rustango -e MYSQL_PASSWORD=rustango \
  -p 3406:3306 mysql:8.0

MYSQL_TEST_URL=mysql://rustango:rustango@127.0.0.1:3406/cookbook_blog_my \
  cargo test --test cookbook_chapter12_bidialect

§12.140 / §12.141 — Rating model save + fetch + multi-row decode via Pool::Mysql and save_pool / fetch_pool. Exercises AUTO_INCREMENT for Auto<i64>, BIGINT round-trip, and the Backend trait dispatch the v0.17.1 macro refactor enabled. → cookbook_rating_round_trips_against_mysql, mysql_decodes_multi_row_select

Surfaced limitation: the cookbook's Author model can't run on MySQL because it has two Auto<T> columns (id: Auto<i64> PK + joined_at: Auto<DateTime> from auto_now_add). MySQL only supports single-column RETURNING via LAST_INSERT_ID(), so save_pool errors with OperatorNotSupportedInDialect { op: "multi-column RETURNING", dialect: "mysql" }. Not a bug — a known dialect divergence the framework surfaces as a clear runtime error. Workaround: drop the auto_now_add mixin on MySQL-targeted models, or split the timestamp column off into a trigger-managed shape.

Sub-sections 12.142 (connection-pool tuning), 12.143 (tracing subscriber + structured logs), 12.144 (manage check warnings), 12.145 (health endpoint), 12.146 (graceful shutdown), 12.147 (test client utilities), 12.148 (inventory mechanism), 12.149 (macro hygiene), 12.150 (project-shape conventions) queued for Slice 12b.

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