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                # 數據庫連接 API 由數據庫 TestCase 中的 `getConnection()` 方法所返回的連接界面有三個很有意思的方法: ~~~ <?php interface PHPUnit_Extensions_Database_DB_IDatabaseConnection { public function createDataSet(Array $tableNames = NULL); public function createQueryTable($resultName, $sql); public function getRowCount($tableName, $whereClause = NULL); // ... } ?> ~~~ 1. `createDataSet()` 方法創建一個在數據集實現一節描述過的 Database (DB) DataSet(數據庫數據集)。 ~~~ <?php class ConnectionTest extends PHPUnit_Extensions_Database_TestCase { public function testCreateDataSet() { $tableNames = array('guestbook'); $dataSet = $this->getConnection()->createDataSet(); } } ?> ~~~ 1. `createQueryTable()` 方法用于創建 QueryTable 的實例,需要為其指定結果名稱和所使用的 SQL 查詢。當涉及到結果/表的斷言(如后面關于數據庫斷言 API 那一節所示)時,這個方法會很方便。 ~~~ <?php class ConnectionTest extends PHPUnit_Extensions_Database_TestCase { public function testCreateQueryTable() { $tableNames = array('guestbook'); $queryTable = $this->getConnection()->createQueryTable('guestbook', 'SELECT * FROM guestbook'); } } ?> ~~~ 1. `getRowCount()` 方法提供了一種方便的方式來取得表中的行數,并且還可以選擇附加一個 WHERE 子句來在計數前對數據行進行過濾。它可以和一個簡單的相等斷言合用: ~~~ <?php class ConnectionTest extends PHPUnit_Extensions_Database_TestCase { public function testGetRowCount() { $this->assertEquals(2, $this->getConnection()->getRowCount('guestbook')); } } ?> ~~~
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