9.5. Zend_Db_Table_Row
السابق | فصل 9. Zend_Db | التالي

## 9.5. Zend_Db_Table_Row

### 9.5.1. Introduction

Zend_Db_Table_Row is a row data gateway for the Zend Framework. In general, you do not instantiate Zend_Db_Table_Row by itself; instead, you get a Zend_Db_Table_Row back as a return result from Zend_Db_Table::find() or Zend_Db_Table::fetchRow(). Once you have a Zend_Db_Table_Row, you can edit the record values (represented as class properties) and then save() the changes back to the originating table.

### 9.5.2. Fetching a Row

The first thing to do is instantiate a Zend_Db_Table class.

    <?php
    // set up an adapter
    require_once 'Zend/Db.php';
    $params = array (
        'host'     => '127.0.0.1',
        'username' => 'malory',
        'password' => '******',
        'dbname'   => 'camelot'
    );

    $db = Zend_Db::factory('PDO_MYSQL', $params);

    // set the default adapter for all Zend_Db_Table objects
    require_once 'Zend/Db/Table.php';
    Zend_Db_Table::setDefaultAdapter($db);

    // connect to a table in the database
    class RoundTable extends Zend_Db_Table {}
    $table = new RoundTable();
    ?>

Next, retrieve one record from the database using Zend_Db_Table::find() with a single key, or by using Zend_Db_Table::fetchRow(). The returned result will be a Zend_Db_Table_Row object where each property in the object is a "camelCaps" name mapped to an "underscore_words" column name from the table. E.g., "first_name" in the table will become "firstName" in the object properties.

    <?php
    // fetch a record from the table as a Zend_Db_Table_Row object
    $row = $table->fetchRow('first_name = "Robin"');

    //
    // $row is now a Zend_Db_Table_Row object with public properties
    // that map to table columns:
    //
    // $row->id = '3'
    // $row->nobleTitle = 'Sir'
    // $row->firstName = 'Robin'
    // $row->favoriteColor = 'yellow'
    //

    ?>

### 9.5.3. Modifying Values

Modifying row values is very easy: just work with the object properties the way you would with any other object. Then you can save() the row back to the table when you are done.

    <?php
    // connect to a table in the database
    class RoundTable extends Zend_Db_Table {}
    $table = new RoundTable();

    // fetch a record from the table as a Zend_Db_Table_Row object
    $row = $table->fetchRow('first_name = "Robin"');

    //
    // $row is now a Zend_Db_Table_Row object() with public properties
    // that map to table columns:
    //
    // $row->id = '3'
    // $row->nobleTitle = 'Sir'
    // $row->firstName = 'Robin'
    // $row->favoriteColor = 'yellow'
    //
    // change the favorite color and save back to the table.
    $row->favoriteColor = 'blue';'
    $row->save();
    ?>

However, you are not allowed to change primary key values; if you do so, Zend_Db_Table_Row will throw an exception.

    <?php
    // connect to a table in the database
    class RoundTable extends Zend_Db_Table {}
    $table = new RoundTable();

    // fetch a record from the table as a Zend_Db_Table_Row object
    $row = $table->fetchRow('first_name = "Robin"');

    // can we change the primary key "id"?
    try {
        $row->id = 5;
        echo "We should not see this message, as an exception was thrown.";
    } catch (Zend_Db_Table_RowException $e) {
        echo $e->getMessage();
    }
    ?>

السابق | أعلى | التالي
9.4. Zend_Db_Table | البداية | 9.6. Zend_Db_Table_Rowset