Question

我只是熟悉准备好的陈述。我有一个查询工作，有一个循环将结果绑定到我可以更容易使用的东西。

现在，我想添加另一个查询，我不确定正确的语法

/* Create a new mysqli object with database connection parameters */
$mysqli = new mysqli($hostname_db, $username_db, $password_db, $database_db);
if(mysqli_connect_errno()) {
  echo "Connection Failed: " . mysqli_connect_errno();
  exit();
}

/* Create a prepared statement */
if($stmt = $mysqli -> prepare("SELECT * FROM table WHERE id = ?")) {

    /* Bind parameters, s - string, b - blob, i - int, etc */
    $stmt -> bind_param("i", $rid);
    $stmt -> execute();

    /* USE loop to bind result and fetch */
    $meta = $stmt->result_metadata();
    while ($field = $meta->fetch_field()) {$parameters[] = &$row[$field->name];}
    call_user_func_array(array($stmt, 'bind_result'), $parameters);
    while ($stmt->fetch()) {
      foreach($row as $key => $val) { $x[$key] = $val;
      }
      $results[] = $x;
    }
    /* Close statement */
    $stmt -> close();

------------------>SHOULD I PUT ANOTHER QUERY HERE?


   }

------------------>OR SHOULD I PUT ANOTHER QUERY HERE INSTEAD?

   /* Close connection */
   $mysqli -> close();

----------------->Or, should I put it here

//END mysqli query method

我不确定这三个职位中哪一个是最佳位置/最佳实践。我可以通过反复试验来完成它，但我想知道什么是最佳实践，我似乎无法找到明确的答案。

提前致谢。

Answer 1

将你的陈述置于另一个之下。不要使用close（），不要使用mysqli预处理语句，不要收集200：

$stmt = $pdo -> prepare("SELECT * FROM table WHERE id = ?");
$stmt -> execute(array($rid));
$results = $stmt -> fetchAll(); // for many rows

$stmt = $pdo -> prepare("SELECT id FROM table WHERE name = ?");
$stmt -> execute(array($name));
$id = $stmt -> fetchColumn(); // for single scalar value

$stmt = $pdo -> prepare("SELECT * FROM table WHERE id = ? LIMIT 1");
$stmt -> execute(array($rid));
$row = $stmt -> fetch(); // for single row

等等

或者，使用even more intelligent library，它甚至可以

// one single line to get your $results instead of screenful of code, mind you
$results = $db->getAll("SELECT * FROM table WHERE id = ?i",$rid);
// as well as others
$id      = $db->getOne("SELECT id FROM table WHERE name = ?s", $name);
$row     = $db->getRow("SELECT * FROM table WHERE id = ?i LIMIT 1",$rid)

还想坚持使用原始的mysqli？

准备好的语句 - 多个查询

1 个答案: