php - PHPUnit 和 MySQL 截断错误

Question

TRUNCATE我对 PHPUnit在插入夹具之前总是运行而不首先设置外键检查的行为感到头疼：

Syntax error or access violation: 1701 Cannot truncate a table referenced in a foreign key constraint

基本上，PHPUnit 在插入固定装置之前会尝试截断表格。我该如何告诉它SET FOREIGN_KEY_CHECKS=0;？

Answer 1

我似乎找到了答案。我最终通过扩展一个类来覆盖一些方法。

<?php

/**
 * Disables foreign key checks temporarily.
 */
class TruncateOperation extends \PHPUnit_Extensions_Database_Operation_Truncate
{
    public function execute(\PHPUnit_Extensions_Database_DB_IDatabaseConnection $connection, \PHPUnit_Extensions_Database_DataSet_IDataSet $dataSet)
    {
        $connection->getConnection()->query("SET foreign_key_checks = 0");
        parent::execute($connection, $dataSet);
        $connection->getConnection()->query("SET foreign_key_checks = 1");
    }
}

然后示例用法：

class FooTest extends \PHPUnit_Extensions_Database_TestCase
{
    public function getSetUpOperation()
    {
        $cascadeTruncates = true; // If you want cascading truncates, false otherwise. If unsure choose false.

        return new \PHPUnit_Extensions_Database_Operation_Composite(array(
            new TruncateOperation($cascadeTruncates),
            \PHPUnit_Extensions_Database_Operation_Factory::INSERT()
        ));
    }
}

因此，我有效地禁用了外键检查，并在它们被设置时将它们重新设置。显然，您应该创建一个具有此功能的基类并扩展它，而不是 PHPUnit 的 TestCase。

Answer 2

或者，您可以通过删除所有记录然后重新设置自动增量计数器的组合来模拟截断。

首先，您必须创建新的数据库操作类来处理重置表的自动增量值。

/**
 * Resets all AUTO_INCREMENT counters on all tables in a dataset.
 * @see PHPUnit_Extensions_Database_Operation_IDatabaseOperation
 */
class ResetAutoincrementOperation implements PHPUnit_Extensions_Database_Operation_IDatabaseOperation
{

    /* 
     * @see PHPUnit_Extensions_Database_Operation_IDatabaseOperation::execute()
     */
    public function execute(PHPUnit_Extensions_Database_DB_IDatabaseConnection $connection, 
            PHPUnit_Extensions_Database_DataSet_IDataSet $dataSet)
    {
        foreach ($dataSet->getReverseIterator() as $table) {
            $query = "ALTER TABLE {$connection->quoteSchemaObject($table->getTableMetaData()->getTableName())}"
                . " AUTO_INCREMENT = 1
            ";

            try {
                $connection->getConnection()->query($query);
            } catch (PDOException $e) {
                throw new PHPUnit_Extensions_Database_Operation_Exception('RESET_AUTOINCREMENT', 
                        $query, array(), $table, $e->getMessage());
            }
        }
    }
}

现在覆盖上面描述的getSetUpOperation()和方法。getTearDownOperation()

class FooTest extends PHPUnit_Extensions_Database_TestCase
{
    /**
     * @see PHPUnit_Extensions_Database_TestCase::getTearDownOperation()
     */
    protected function getTearDownOperation ()
    {
        // Clean up after ourselves
        return new PHPUnit_Extensions_Database_Operation_Composite(array(
            PHPUnit_Extensions_Database_Operation_Factory::DELETE_ALL(), // 1. delete all records from table
            new ResetAutoincrementOperation() // 2. reset auto increment value
        ));
    }

    /**
     * @see PHPUnit_Extensions_Database_TestCase::getSetUpOperation ()
     */
    protected function getSetUpOperation ()
    {
        return new PHPUnit_Extensions_Database_Operation_Composite(array(
                PHPUnit_Extensions_Database_Operation_Factory::DELETE_ALL(), // 1. delete all records from table
                new ResetAutoincrementOperation(), // 2. reset auto increment value
                PHPUnit_Extensions_Database_Operation_Factory::INSERT() // 3. insert new records
        ));
    }
}

使用 MySQL 5.5.24 和 PHPUnit 3.6.10 为我工作

Answer 3

\DB::statement('SET FOREIGN_KEY_CHECKS=0;');