cakePHP update table fields

Question

I have a cakePHP problem - I want to make a update query like this

UPDATE table SET field = field + some_var

and I don't know how to do it...

Can anyone help me?

Answer 1

The only "right" way would be using cake's "atomic query" wrapper methods. In your case that would be "updateAll". The question is a complete duplicate of a dozen other questions - like Incrementing Cakephp database field by a value

$var = 1;
$this->Article->updateAll(
    array('Article.viewed' => 'Article.viewed + ' . $var),                    
    array('Article.id' => $id)
);

This is also in the docs: http://book.cakephp.org/2.0/en/models/saving-your-data.html#model-updateall-array-fields-array-conditions

Answer 2

There are two ways to do an update:

If you are only updating one field you can do:

$this->Model->id = foo;
$this->Model->saveField('field_name', 'field_value');

or, you can do an update using $this->Model->save():

$data = array(
    'Model'=>array(
        'id'=>foo,
        'field_name'=>'field_value',
        'another_field_name'=>'another_field_value'
    )
);

$this->Model->save($data);

You want to avoid using $this->Model->query() and use CakePHP's built in methods because the build in methods are datasource agnostic (they work the same on MySQL, Oracle, MSSQL etc.)

Answer 3

You can use the callback method beforeSave to implement what you need.

Callback Method: BeforeSave

public function beforeSave($options = array()) {
    if (!empty($this->data['table']['field'])){
         $this->data['table']['field'] += $this->data['table']['some_var'];
    }
    return true;
}

Answer 4

I think the best method is using the Model::updateAll(array $fields, array $conditions) .

The Model::saveField(string $fieldName, string $fieldValue, $validate = false) this method when you try to update using same primary key it shows cannot replace duplicate key error . And think when one updates they must be using the primary key as a matching value to update value.

Answer 5

Use

$this->Baker->updateAll(
    array('Baker.approved' => 'Baker.approved + ' . $some_var),
    array('Baker.id' => $someId)
);

For more information see: http://book.cakephp.org/2.0/en/models/saving-your-data.html