feat: support using session to execute statements in transaction (#3252)

core/stores/sqlx/tx.go

@@ -15,11 +15,27 @@ type (
 		Rollback() error
 	}
 
+	txConn struct {
+		Session
+	}
+
 	txSession struct {
 		*sql.Tx
 	}
 )
 
+func (s txConn) RawDB() (*sql.DB, error) {
+	return nil, errNoRawDBFromTx
+}
+
+func (s txConn) Transact(_ func(Session) error) error {
+	return errCantNestTx
+}
+
+func (s txConn) TransactCtx(_ context.Context, _ func(context.Context, Session) error) error {
+	return errCantNestTx
+}
+
 // NewSessionFromTx returns a Session with the given sql.Tx.
 // Use it with caution, it's provided for other ORM to interact with.
 func NewSessionFromTx(tx *sql.Tx) Session {