PHP ORM架構ezpdo（3）之事務

ezpdo也有交易處理了，可以支援自動交易回復和手工復原
首先看自動復原的事務

// 獲得 EZPDO管理器
$m = epManager::instance();
 

$os = $m->find("from SomeClass as c where c.var = 'x'");
if (!$os) {
  echo "no object found\n";
  exit(-1);
}
 
$o = $os[0];
 
//用start_t()開始事務
$m->start_t();
 
// 改變值了
$o->var = 'y';
 
// 結束事務提交
$m->commit_t(); // by default: auto-rollback
 
另外是需要用try catch的，手工來復原
// get the EZPDO manager
$m = epManager::instance();
 
// find an object using EZOQL
$os = $m->find("from SomeClass as c where c.var = 'x'");
if (!$os) {
  echo "no object found\n";
  exit(-1);
}
 
$o = $os[0];
 
// call manager to start transaction
$m->start_t();
try {
 
  // change the value of var in object
  $o->var = 'y';
 
  // end transaction and save changed objects
  $m->commit_t(false); // false: no auto rollback
 
}
catch (Exception $e) {
 
  // something wrong. rollback to old values
  $m->rollback_t();
 
  // do something here
  // ......
}
 
// 'y' if transaction successful; 'x' if failed.
echo $o->var;