Difference Between setData() and addData()
setData
overrides the existing data and can receive as parameter either a pair key-value either an array.
if you set as parameters a pair key-value then $_data[key]
becomes value
. If you set as parameter an array $_data
becomes that array overwriting what ever it contained previously.
Example:
$_data = array('k1' => 'v1' , 'k2' => 'v2');
calling $obj->setData('k3','v3')
results in
$_data = array('k1' => 'v1' , 'k2' => 'v2', 'k3'=>'v3');
calling $obj->setData(array('k3'=>'v3'))
results in
$_data = array('k3'=>'v3');
calling $obj->setData('k2','v2000')
results in
$_data = array('k1' => 'v1' , 'k2' => 'v2000')
calling $obj->setData(array('k2'=>'v2000'))
results in
$_data = array('k2'=>'v2000');
addData
receives as parameter only an array and it merges that array with the existing data.
Example:
$_data = array('k1' => 'v1' , 'k2' => 'v2');
calling $obj->addData(array('k3'=>'v3'))
results in
$_data = array('k1' => 'v1' , 'k2' => 'v2', 'k3'=>'v3');
but calling $obj->addData(array('k2'=>'v2000'))
results in
$_data = array('k1' => 'v1' , 'k2' => 'v2000');
setData()
function is only set one field value on one call
. it can set multiple field value using multiple call of setData function
.
addData() function is set multiple field values using array with array key as field index.
Just Example:
You want two field to set at object.
- field a>Value->X
- field b>Value->Y
If i using setData()
then you need to do this type of works.need For two field you need call setData function two wise.
$ObVarien->setData('fieldA',$X);
$ObVarien->setData('fieldB',$Y);
But if i using addData()
then you can do this array key as field name
$Data=array('fieldA'=>$X,'fieldb'=>$Y)
$ObVarien->addData($Data)
addData() and setData() are two Library Varien_Object
class function.
addData() using setData() at lib file for set field value using loop.
public function addData(array $arr)
{
foreach($arr as $index=>$value) {
$this->setData($index, $value);
}
return $this;
}