SQL RETURNING ID总是返回1作为结果

Question

i use CodeIgniter and PostgreSQL

I write SQL like this :

$sql = "INSERT INTO(a,b) VALUES (1,2) RETURNING id";

I execute that query like this :

$id = $this->db->query($sql);

The question is , why i alway get "1" as return value of the query? I can sure in database the next value of id (auto increment) is 100 not 1.If i execute that query directly inside phppgadmin the return value is 100 not 1 like execute from my php code.

Answer 1

1 means True and query executed successfully

Use $this->db->insert_id(); to get the last insert id

Answer 2

CodeIgniter's insert_id() will only return an ID of an insert()

Ex:

$this->db->insert('posts', $post_data);
$insert_id = $this->db->insert_id();

Note: Insert query will return 0, 1. 0: failure, 1: success