About the usage of Zend_Db_Table_Rowset in Zend Framework

This article mainly introduces the usage of Zend_Db_Table_Rowset in the Zend Framework framework tutorial, and analyzes the related techniques of Zend_Db_Table_Rowset operation result set in the form of examples. Friends in need can refer to it

The examples of this article describe the Zend Framework framework Zend_Db_Table_Rowset usage. Share it with everyone for your reference, as follows:

1. Introduction

Zend_Db_Table_Rowset is an iterator of the Zend_Db_Table_Row object collection. Generally speaking, you cannot instantiate it yourself Zend_Db_Table_Rowset, instead, Zend_Db_Table_Rowset is returned as the result data by calling the Zend_Db_Table::find() method or the fetchAll() method. Then you can traverse the Zend_Db_Table_Row object collection and modify it.

2. Retrieve the result set

First, you need to instantiate a Zend_Db_Table class.

<?php
// 设置一个 adapter
require_once &#39;Zend/Db.php&#39;;
$params = array (
  &#39;host&#39;   => &#39;127.0.0.1&#39;,
  &#39;username&#39; => &#39;malory&#39;,
  &#39;password&#39; => &#39;******&#39;,
  &#39;dbname&#39;  => &#39;camelot&#39;
);
$db = Zend_Db::factory(&#39;PDO_MYSQL&#39;, $params);
// 为所有的Zend_Db_Table对象设置默认
require_once &#39;Zend/Db/Table.php&#39;;
Zend_Db_Table::setDefaultAdapter($db);
// 连接数据库表
class RoundTable extends Zend_Db_Table {}
$table = new RoundTable();
?>

Next, you can Use the Zend_Db_Table::find() method and multiple key values, or use the Zend_Db_Table::fetchAll() method to query the database.
The returned result is a Zend_Db_Table_Rowset object, through which each Zend_Db_Table_Row in the result set can be traversed Object.

<?php
// 从表中取回多条记录
$rowset = $table->fetchAll();
//
// $rowset现在是一个Zend_Db_Table_Rowset对象,该对象中每条记录就是一个Zend_Db_Table_Row对象
//
?>

3. Traverse the result set

Zend_Db_Table_Rowset implements the iterator interface of a simple programming language, In other words, you can loop through the Zend_Db_Table_Rowset object just like you use the foreach() function to process an array. Each value retrieved using this method is a Zend_Db_Table_Row object corresponding to the data in the table. You can view, modify and Save the attributes of the object (that is, the field values ​​in the table.)

<?php
// 连接到数据库中的表
class RoundTable extends Zend_Db_Table {}
$table = new RoundTable();
// 从表中取回多条记录
$rowset = $table->fetchAll();
// 显示所有的记录
foreach ($rowset as $row) {
  // $row 是一个 Zend_Db_Table_Row 对象
  echo "<p>" . htmlspecialchars($row->nobleTitle) . " "
    . htmlspecialchars($row->firstName) . "&#39;s "
    . "favorite color is " . htmlspecialchars($row->favoriteColor)
    . ".</p>/n";
  // 更新我们显示改行的次数
  // (对应表中的"times_displayed"字段)
  $row->timesDisplayed ++;
  // 保存新记录.
  $row->save();
}
?>

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