DatabaseConnection directly from PgPool (#2348)

* feat(postgres): create `DatabaseConnection` directly from `PgPool`

This allows sqlx-based connection pools that were already on-hand to be
easily converted into SeaORM types.

* Move `From` impls into driver

* impls for MySQL and SQLite

* CHANGELOG

* fmt

---------

Co-authored-by: Billy Chan <ccw.billy.123@gmail.com>

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Enhancements
 
 * [sea-orm-macros] Call `EnumIter::get` using fully qualified syntax https://github.com/SeaQL/sea-orm/pull/2321
+* Construct `DatabaseConnection` directly from `sqlx::PgPool`, `sqlx::SqlitePool` and `sqlx::MySqlPool` https://github.com/SeaQL/sea-orm/pull/2348
 
 ### Upgrades
 

src/driver/sqlx_mysql.rs

@@ -36,6 +36,21 @@ impl std::fmt::Debug for SqlxMySqlPoolConnection {
     }
 }
 
+impl From<MySqlPool> for SqlxMySqlPoolConnection {
+    fn from(pool: MySqlPool) -> Self {
+        SqlxMySqlPoolConnection {
+            pool,
+            metric_callback: None,
+        }
+    }
+}
+
+impl From<MySqlPool> for DatabaseConnection {
+    fn from(pool: MySqlPool) -> Self {
+        DatabaseConnection::SqlxMySqlPoolConnection(pool.into())
+    }
+}
+
 impl SqlxMySqlConnector {
     /// Check if the URI provided corresponds to `mysql://` for a MySQL database
     pub fn accepts(string: &str) -> bool {

src/driver/sqlx_postgres.rs

@@ -36,6 +36,21 @@ impl std::fmt::Debug for SqlxPostgresPoolConnection {
     }
 }
 
+impl From<PgPool> for SqlxPostgresPoolConnection {
+    fn from(pool: PgPool) -> Self {
+        SqlxPostgresPoolConnection {
+            pool,
+            metric_callback: None,
+        }
+    }
+}
+
+impl From<PgPool> for DatabaseConnection {
+    fn from(pool: PgPool) -> Self {
+        DatabaseConnection::SqlxPostgresPoolConnection(pool.into())
+    }
+}
+
 impl SqlxPostgresConnector {
     /// Check if the URI provided corresponds to `postgres://` for a PostgreSQL database
     pub fn accepts(string: &str) -> bool {

src/driver/sqlx_sqlite.rs

@@ -37,6 +37,21 @@ impl std::fmt::Debug for SqlxSqlitePoolConnection {
     }
 }
 
+impl From<SqlitePool> for SqlxSqlitePoolConnection {
+    fn from(pool: SqlitePool) -> Self {
+        SqlxSqlitePoolConnection {
+            pool,
+            metric_callback: None,
+        }
+    }
+}
+
+impl From<SqlitePool> for DatabaseConnection {
+    fn from(pool: SqlitePool) -> Self {
+        DatabaseConnection::SqlxSqlitePoolConnection(pool.into())
+    }
+}
+
 impl SqlxSqliteConnector {
     /// Check if the URI provided corresponds to `sqlite:` for a SQLite database
     pub fn accepts(string: &str) -> bool {