MySQL cross-database transaction XA operation example

SHOW VARIABLES LIKE '%XA%'

SET innodb_support_xa = ON

<?PHP
$dbtest1 = new mysqli("172.20.101.17","public","public","dbtest1")or die("dbtest1 connection failed");
$dbtest2 = new mysqli("172.20.101.18","public","public","dbtest2")or die("dbtest2 connection failed");
//Specify an id for the XA transaction. xid must be a unique value.
$xid = uniqid("");
//The two databases specify the same transaction ID, indicating that the operations of the two databases are in the same transaction $dbtest1->query("XA START '$xid'"); //Prepare transaction 1
$dbtest2->query("XA START '$xid'"); //Prepare transaction 2
try {
  //$dbtest1
  $return = $dbtest1->query("UPDATE member SET name='唐大麦' WHERE id=1");
  if($return == false) {
    throw new Exception("The update member operation failed in the library [email protected]!");
  }
  //$dbtest2
  $return = $dbtest2->query("UPDATE memberpoints SET point=point+10 WHERE memberid=1");
  if($return == false) {
    throw new Exception("The update memberpoints operation failed in the database [email protected]!");
  }
  //Phase 1: $dbtest1 is ready to submit $dbtest1->query("XA END '$xid'");
  $dbtest1->query("XA PREPARE '$xid'");
  //Phase 1: $dbtest2 is ready to submit $dbtest2->query("XA END '$xid'");
  $dbtest2->query("XA PREPARE '$xid'");
  //Phase 2: Submit two databases $dbtest1->query("XA COMMIT '$xid'");
  $dbtest2->query("XA COMMIT '$xid'");
}
catch (Exception $e) {
  //Phase 2: Rollback $dbtest1->query("XA ROLLBACK '$xid'");
  $dbtest2->query("XA ROLLBACK '$xid'");
  die($e->getMessage());
}
$dbtest1->close();
$dbtest2->close();
?>