This page describes how to connect to a Cloud SQL instance from a service running in the App Engine flexible environment. For a more detailed overview, see [What is Cloud SQL](https://docs.cloud.google.com/sql/docs/postgres/introduction) in the Cloud SQL documentation. You can connect to your Cloud SQL instance using: - [MYSQL](https://docs.cloud.google.com/sql/docs/mysql/connect-app-engine-flexible) - [PostgreSQL](https://docs.cloud.google.com/sql/docs/postgres/connect-app-engine-flexible)