SHOW VARIABLES LIKE '%XA%'

SET innodb_support_xa = ON

<"172.20.101.17","public","public","dbtest1")or die("dbtest1 连接失败");
$dbtest2   = new mysqli("172.20.101.18","public","public","dbtest2")or die("dbtest2 连接失败");
//为XA事务指定一个id，xid 必须是一个唯一值。
$xid = uniqid("");
//两个库指定同一个事务id，表明这两个库的操作处于同一事务中
$dbtest1->query("XA START '$xid'");//准备事务1
$dbtest2->query("XA START '$xid'");//准备事务2
try {
  //$dbtest1
  $return = $dbtest1->query("UPDATE member SET name='唐大麦' WHERE id=1") ;
  if($return == false) {
    throw new Exception("库dbtest1@172.20.101.17执行update member操作失败！");
  }
  //$dbtest2
  $return = $dbtest2->query("UPDATE memberpoints SET point=point+10 WHERE memberid=1") ;
  if($return == false) {
    throw new Exception("库dbtest1@172.20.101.18执行update memberpoints操作失败！");
  }
  //阶段1：$dbtest1提交准备就绪
  $dbtest1->query("XA END '$xid'");
  $dbtest1->query("XA PREPARE '$xid'");
  //阶段1：$dbtest2提交准备就绪
  $dbtest2->query("XA END '$xid'");
  $dbtest2->query("XA PREPARE '$xid'");
  //阶段2：提交两个库
  $dbtest1->query("XA COMMIT '$xid'");
  $dbtest2->query("XA COMMIT '$xid'");
}
catch (Exception $e) {
  //阶段2：回滚
  $dbtest1->query("XA ROLLBACK '$xid'");
  $dbtest2->query("XA ROLLBACK '$xid'");
  die($e->getMessage());
}
$dbtest1->close();
$dbtest2->close();
?>