automatic reconnect with retry after connection closed#37

7yyo wants to merge 7 commits intopingcap:5.0-mysql-support-opt-2.1pingcap/benchmarksql:5.0-mysql-support-opt-2.1from

7yyo:check_conn_before_rollback7yyo/benchmarksql:check_conn_before_rollbackCopy head branch name to clipboard