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php连接数据库类(后续再加)

query('set names utf8');
if(!$dbh){
    exit('连接数据库失败');
}
$context = $dbh->query("select * from my_test");
$res = $context->fetchAll(PDO::FETCH_ASSOC);
var_dump($res);
$dbh->beginTransaction();
$count = $dbh->exec("delete from `my_test` where my_id<150");
$dbh->rollback();
$dbh->commit();

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