使用不同功能的where子句的Codeigniter

Question

I have a Postgres database with a table for orders and a table order_contents , which includes all items of the order , and the order_id . I'm trying to make a view with order history.

In my model I have two functions, one to retrieve orders, and another to retrieve all the contents of an order, like so:

function retrieve_orders($userID){
    $query = $this->db->get('orders');
    $this->db->where('user_id', $userID);
    return $query->result_array();
}

function get_order_contents($orderID){
    $query = $this->db->get('order_contents');
    $this->db->where('order_id', $orderID);
    return $query->result_array();
}

So in my controller I call retrieve_orders() and pass the resulting array to the view. In the view, I want to create an HTML table for each order with all it's contents. So I iterate through each order and call get_order_contents in the loop.

Everything should work, however what happens is this error shows up in the source:

Error Number:

ERROR: column "user_id" does not exist LINE 3: WHERE "user_id" = '3' ^

SELECT * FROM "order_contents" WHERE "user_id" = '3'

As you can see, for some reason, when I call get_order_contents() in the view, it uses the where clause I specified for the retrieve_orders() function.

What I have done so far is try to manually stop caching, but to no avail. Any help here is appreciated.

Answer 1

In each function, try to put where() before get().

When you try to get() order_contents it will use where clause from previous where().

Common practice is, use get() at the last call of $this->db after other calls such as where(), etc. See the Active Record documentation in codeigniter.

Answer 2

Chain your db functions like this

return $this->db->where('user_id', $userID)
                ->get('orders')
                ->result_array();

Answer 3

为什么不使用$this->db->get_where()