Question

I am getting a headache with PHPUnit’s behavior of always running TRUNCATE prior to inserting fixtures without first setting foreign key checks off:

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

Basically, PHPUnit tries to truncate a table before it inserts fixtures. How do I tell it to SET FOREIGN_KEY_CHECKS=0;?

Answer 1

I found the answer it seems. I ended up overriding some methods by extending a class.

<?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");
    }
}

Then example usage:

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()
        ));
    }
}

So I’m effectively disabling foreign key checks and setting them back if they were ever set. Obviously you should make a base class that has this functionality and you extend it rather than PHPUnit’s TestCase.