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Extension Development, add a startingpoint

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How to add a startingpoint

Remove pages from subtypes_excludelist in ext_tables.php:

    = 'layout,select_key';

The current settings for pages and recursivity are in $this->cObj->data. The plugin base class provides a method pi_getPidList() to transform both data in a comma separated string:

$pidList = $this->pi_getPidList($this->cObj->data['pages'], $this->cObj->data['recursive']);
//if "pages" contains 312 and 313, and 314 is below 313
// and recursive is set to 1, $pidList will be
// 312,313,314

Now we may use MySQL's IN operator to make sure we select only records on the desired pages. We also use t3lib_DB::cleanIntList() to stay safe of sql injections:

// Get resource records:
$res = $GLOBALS['TYPO3_DB']->exec_SELECTquery(
    "*", "tx_myext_table",
    "pid IN (" . $GLOBALS['TYPO3_DB']->cleanIntList($selectedPids) . ")" 
    . " AND my_criteria=" . $criteria//extend that as you like

//displaying retrieved records				
while ($row = $GLOBALS['TYPO3_DB']->sql_fetch_assoc($res)) {
    $content.= "found record uid=".$row['uid']; 

Speed improvements

You can do like this if you want to hardcode the sql statement and avoid recursion and gain some speed:

$this->andWhere('uid' => '666');

$res = $GLOBALS['TYPO3_DB']->exec_SELECTquery(
    '*,V.title VT,V.uid VU,S.title ST,S.uid SU,S1.uid S1U, S1.title S1T, S2.uid S2U, S2.title S2T',
    'pages WA INNER JOIN pages V ON INNER JOIN pages S ON INNER JOIN pages S1 ON INNER JOIN pages S2 ON',
    'S2.uid='..$GLOBALS['TYPO3_DB']->cleanIntList($parentUid).' AND WA.deleted=0 AND WA.hidden=0'.(count($this->andWhere)?' AND '.implode(' AND ',$this->andWhere):'').(count($this->orWhere)?' AND ('.implode(' OR ',$this->orWhere).')':''),

--Chibox 15:38, 12 February 2008 (CET)