select 来自多列：codeIgniter

Question

I want to select multiple columns in a table using codeIgniter active records. Selecting using

    $this->db->select('*');
    $this->db->from($this->table_name);

but selecting a number of columns eg

   $this->db->select('username','email','last_login','created','modified','group_id');
    $this->db->from($this->table_name);

does not work.It only returns an array with the values from the first column. How should I do this?

according to the CodeIgniter user guide they gave the following example. so I thought it should work in my case.

$this->db->select('title, content, date');

$query = $this->db->get('mytable');

// Produces: SELECT title, content, date FROM mytable

Answer 1

The second query will not work as you expect, as select() expects a string or array as the first parameter rather than taking unlimited arguments. In your example, only username would be selected. The correct string syntax is this:

$this->db->select('username, email, last_login, created, modified, group_id');

There's much more I could share with you, but I suggest you have another read or two through the Active Record documentation instead. Good luck, and enjoy Codeigniter!

AFTER YOUR EDIT : Please note the differences in these two examples:

1 - This line passes each column as a separate argument:

$this->db
    ->select('username','email','last_login','created','modified','group_id');

2 - This line correctly passes one argument (comma separated string):

$this->db
    ->select('username, email, last_login, created, modified, group_id');

Note the absence of quotes around each column name in the (correct) example 2 . In example 1, there are several arguments passed to the function, and only the first one is used, while the rest are ignored.