问题描述:

I am working with Codeigniter with mysql databases,

I have a model function

public function get_all_data(){

$this->output->enable_profiler(TRUE);

$years = $this->input->post('year');

$months = $this->input->post('month');

$exec_ids = $this->input->post('exec_id');

$query = $this->db->query("SELECT * FROM client_booking AS cb

RIGHT OUTER JOIN executive_client_unit_relation AS ecur ON cb.id = ecur.booking_id

LEFT OUTER JOIN new_invoice ON cb.id = new_invoice.booking_id

WHERE ecur.executive_id IN (" . implode(',', $exec_ids) . ") AND MONTH(cb.booking_date) IN (" . implode(',', $months) . ") AND YEAR(cb.booking_date) IN (" . implode(',', $years) . ")");

return $query->result();

}

The sql generated by this is (as seen in the profiler) :

SELECT * FROM client_booking AS cb

RIGHT OUTER JOIN executive_client_unit_relation AS ecur ON cb.id = ecur.booking_id

LEFT OUTER JOIN new_invoice ON cb.id = new_invoice.booking_id

WHERE ecur.executive_id IN (4,5,6) AND MONTH(cb.booking_date) IN (1,2,3,4,5) AND YEAR(cb.booking_date) IN (2013,2014)

My problem is that the booking_id value is set to NULL when I var_dump() the result of this query.

On the other hand, when I run the SQL in my phpmyadmin, everything goes well and I can see the booking_id

PS: client_booking table's primary key is id which is the booking_id for all the other tables.

Can anyone help me to resolve this?

网友答案:

You are using LEFT/RIGHT joins so when there is no association found between your tables a null row will be returned ,second thing is your tables new_invoice and executive_client_unit_relation both have common names for the column name booking_id and in your select statement you are doing select * so for the columns with same name i guess the last one is picked which is null,for the solution you either you select only needed columns not all like SELECT cb.* or either the columns have same name with your query table then specify them individually with the alias you wish to provide but in the end of select statement in query like SELECT *,cb.id AS booking_id,....

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