How to check if id already exists - codeigniter

Question

i am trying to check if an id in the database already exists and if it does not then only insert that id and not the other ones that exist

I have tried to do a where sta

Answer 1

For Checking An Id Or any column value exist not in database CI have a validation rule for it.

See it live here: Validation Rule

Rule: is_unique

Returns FALSE if the form element is not unique to the table and field name in the parameter. Note: This rule requires Query Builder to be enabled in order to work.

Example: is_unique[table.field]

$this->form_validation->set_rules(
        'username', 'Username',
        'required|min_length[5]|max_length[12]|is_unique[users.username]',
        array(
                'required'      => 'You have not provided %s.',
                'is_unique'     => 'This %s already exists.'
        )
);

For More Advance use of validation, You can add all validation Setting Rules Using an Array.

        $this->form_validation->set_rules(
            'username', 'Username',
            'required|min_length[5]|max_length[12]|is_unique[users.username]',
            array(
                    'required'      => 'You have not provided %s.',
                    'is_unique'     => 'This %s already exists.'
            )
    );


    $config = array(
        'your_rule_name' => array(
                array(
                        'username', 'Username',
                        'required|min_length[5]|max_length[12]|is_unique[users.username]',
                        array(
                                'required'      => 'You have not provided %s.',
                                'is_unique'     => 'This %s already exists.'
                        )
                )
        ),        
        array(
                'field' => 'email',
                'label' => 'Email',
                'rules' => 'required'
        )
);

$this->form_validation->set_rules($config);