(kohana) Unittest DbUnit foreign key constraint - mysql

Question

I've searched through google/stackoverflow for a solution but failed to find a satisfying solution.
My issue:
[SQLSTATE[42000]: Syntax error or access violation: 1701 Cannot truncate a table referenced in a
foreign key constraint (integration.b_node_leafs, CONSTRAINT fk_node_id
FOREIGN KEY (node_id) REFERENCES integration.b_nodes (id))]
And I can't find anywhere in the docs who to solve this issue neither a order for the XmlDataSet (which I use).
This doesn't work.
public function setUp() {
$conn=$this->getConnection();
$conn->getConnection()->query("set foreign_key_checks=0");
parent::setUp();
$conn->getConnection()->query("set foreign_key_checks=1");
}
Results in mysql.log
Connect root#localhost on integration_db
Query set foreign_key_checks=0
Connect root#localhost on integration_db
Query TRUNCATE `table_name`
Quit
Quit
This is my dataset.xml (As you can see I start from the bottom).
<?xml version="1.0" encoding="UTF-8"?>
<dataset>
<!-- Meta for node -->
<b_meta id="4321" created_by="###NULL###" deleted="0" />
<!-- Meta for leaf -->
<b_meta id="1010" created_by="###NULL###" deleted="0" />
<!-- Meta for post -->
<b_meta id="1050" created_by="###NULL###" deleted="0" />
<!-- meta for comment -->
<b_meta id="7894" created_by="###NULL###" deleted="0" />
<!-- Add comment -->
<b_comments id="5555" meta_id="7894" text="This is a integrationtest" />
<!-- Add Post -->
<b_posts id="4646" meta_id="1050" title="How to integration" seo_title="how-to-integration" text="Explain why to use integrationtests" />
<!-- Link comment to post -->
<b_post_comments post_id="4646" comment_id="5555" />
<!-- Add Leaf -->
<b_leafs id="3535" meta_id="1010" title="App Testing" seo_title="app-testing" />
<!-- Link leaf to post -->
<b_leaf_posts leaf_id="3535" post_id="4646" />
<!-- Add node -->
<b_nodes id="1234" meta_id="4321" type="forum" title="PHP" />
<!-- Link node to leaf -->
<b_node_leafs node_id="1234" leaf_id="3535" />
</dataset>
PS: I run on PHPUnit 3.7.28

Answer 1

My solution was to save the connection for multiple uses instead of creating new connection for each operation.
In your test setUp function add
public function setUp()
{
$conn = $this->getConnection();
$conn->getConnection()->query("set foreign_key_checks=0");
return parent::setUp();
}
In Kohana_Unittest_Database_TestCase
protected $_connection;
public function getConnection()
{
if ($this->_connection !== NULL)
{
return $this->_connection;
}
// Get the unittesting db connection
$config = Kohana::$config->load('database.'.$this->_database_connection);
if(strtolower($config['type']) !== 'pdo')
{
$config['connection']['dsn'] = strtolower($config['type']).':'.
'host='.$config['connection']['hostname'].';'.
'dbname='.$config['connection']['database'];
}
$pdo = new PDO(
$config['connection']['dsn'],
$config['connection']['username'],
$config['connection']['password']
);
$this->_connection = $this->createDefaultDBConnection($pdo, $config['connection']['database']);
return $this->_connection;
}
See my pull request: https://github.com/kohana/unittest/pull/36