cakePHP复杂查找查询

how do I build a find() query in cakePHP using these conditions:

Find where 
MyModel.x = 1 and MyModel.y = 2 OR 
MyModel.x = 1 and MyModel.y value does not exist (or is equal to empty string)

Can somebody tell me how I can go about building such find query?

I'm gonna give you some pointers, but you need to try to do this as it's very basic and it's always good to practice.

A basic find in cake is in the form of

$this->ModelName->find('all');

This in its default form does a SELECT * from model_names (convention is to have singular ModelName for plural table name - model_names)

To add conditions:

$this->ModelName->find('all', array('conditions' => array('ModelName.x' => 1));

To add AND conditions

$this->ModelName->find('all', array('conditions' => array(
   'ModelName.x' => 1, 'ModelName.y' => 2
));

To add OR conditions

$this->ModelName->find('all', array('conditions' => array(
   'OR' => array(
      'ModelName.x' => 1, 'ModelName.y' => 2
    )
));

To combine both

$this->ModelName->find('all', array('conditions' => array(
   'ModelName.y is not' => null,
   'OR' => array(
      'ModelName.x' => 1, 'ModelName.y' => 2
    )
));

// where y is not null and (x = 1 or y = 2) 

http://book.cakephp.org/1.3/view/1030/Complex-Find-Conditions

(btw I'm sure there will be users giving you the exact answers, so just take my answer for your reference :) )

$this->MyModel->find('all', array('conditions' => array(
    'OR' => array(
         array(
             'MyModel.x' => 1,
             'MyModel.y' => 1
         ),
         array(
             'MyModle.x' => 1,
             'OR' => array(
                  array('MyModel.y' => NULL),
                  array('MyModel.y' => '')
             )
         )
    )
)));