Extbase - get created sql from query

Question

i want to get some database tables from my typo3 extensions. The Extension is based on extbase.

The query always returns nothing but the data exists

I've tried this:

$query = $this->createQuery();
$query->statement('SELECT * FROM `my_table`
    WHERE field = ? ORDER BY date DESC LIMIT 1',
    array($condition));

$results = $query->execute();

and this:

$query = $this->createQuery();

$query->matching($query->equals('field', $condition));
$query->setOrderings(array('date' => Tx_Extbase_Persistence_QueryInterface::ORDER_DESCENDING));
$query->setLimit(1);

$results = $query->execute();

both returns null as result.

Is it possible to get the sql that the class creates to look where the bug is?

I've looked in some extbase persistent classes but didn't find a clue

EDIT: For those who are interested.. i found a "solution".

If you create the query with the statement() method, you can print the query with this function

echo $query->getStatement()->getStatement();

It doesn't replace the placeholder. But you can get the Variables with this method

var_dump($query->getStatement()->getBoundVariables());

Thats the best Solution that i found, without editing the extbase extenstions

Answer 1

In TYPO3 6.2 you can use Extbase DebuggerUtility to debug the query.

Add this code before $query->execute():

$queryParser = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Extbase\\Persistence\\Generic\\Storage\\Typo3DbQueryParser');
\TYPO3\CMS\Extbase\Utility\DebuggerUtility::var_dump($queryParser->parseQuery($query));

For TYPO3 8.7+ use this code instead:

$queryParser = \TYPO3\CMS\Core\Utility\GeneralUtilityGeneralUtility::makeInstance(\TYPO3\CMS\Extbase\Persistence\Generic\Storage\Typo3DbQueryParser::class);
$doctrineQueryBuilder = $queryParser->convertQueryToDoctrineQueryBuilder($query);
$doctrineQueryBuilderSQL = $doctrineQueryBuilder->getSQL();
$doctrineQueryBuilderParameters = $doctrineQueryBuilder->getParameters();

Answer 2

Improvement to biesiors answer:

As Extbase replaces some placeholders after calling buildQuery(), you might prefer to place the debug output into getObjectDataByQuery(), just after $this->replacePlaceholders($sql, $parameters, $tableName);

if (strpos($sql, "your_table_name.")) {
    debug($sql, 'my debug output');
};

Also, better use debug() instead of var_dump().
[File: typo3\sysext\extbase\Classes\Persistence\Generic\Storage\Typo3DbBackend.php. Line 339 in version 6.1]:

Answer 3

Check this snippet, although it's not very comfortable in use it helps a lot:

in general you need this code at the end of the buildQuery(array $sql) method (*) - right before return $statement;

if (in_array("your_table_name", $sql['tables'])) {
    var_dump($statement);
    print_r($statement);
}

(*) Class file:

• TYPO3 ver.: 4.x: typo3/sysext/extbase/Classes/Persistence/Storage/Typo3DbBackend.php
• TYPO3 ver.: 6.x: typo3/sysext/extbase/Classes/Persistence/Generic/Storage/Typo3DbBackend.php

---

In 6.2.x ...

You can try within \TYPO3\CMS\Core\Database\DatabaseConnection::exec_SELECTquery method, just add the condition after fetching the $query, like (trim is important!):

public function exec_SELECTquery($select_fields, $from_table, $where_clause, $groupBy = '', $orderBy = '', $limit = '') {
    $query = $this->SELECTquery($select_fields, $from_table, $where_clause, $groupBy, $orderBy, $limit);

    if (trim($from_table) == 'fe_users') {
        DebuggerUtility::var_dump($query);
    }

// rest of method

Answer 4

An easy way without changing any Typo3 core code and not mentioned in any forum so far is using the php "serialize()" method:

$result = $query->execute();
echo (serialize($result));

In the result object you find the SQL query ("statement;" ...)