My first table category contain categoryid and categories.
Second table bloggers contains bloggercategory.
bloggercategory contain array of categoryid (more than one categoryid).
function selectusercategories($sess_id)
{
$this->db->select('*');
$this->db->from('categories');
$this->db->join('bloggers', 'blogger_category = category_ID');
$this->db->where('ID', $sess_id);
$querycat = $this->db->get();
return $querycat->result();
}
Can I join the two tables to display the bloggercategory individualy from the array with its categories. I tried this way but its not working.
For comma separated field, use MySQL FIND_IN_SET()
SELECT *
FROM categories c
JOIN bloggers b
ON FIND_IN_SET(c.category_ID ,b.blogger_category)
Try this..
$this->db->select("*");
$this->db->from('categories');
$this->db->join('bloggers', 'categories.category_ID= bloggers.blogger_category ');
$query = $this->db->get();
return $query->result();
Related
code:
public function draft_post($idd)
{
$this->db->select('*');
$this->db->from('registration');
$this->db->join('draft_registration', 'registration.user_id= draft_registration.user_id','INNER');
$this->db->where('registration.user_id', $idd);
$query = $this->db->get();
$result = $query->result_array();
return $result;
}
In this codes, I have two table i.e. registration and draft_registration. Now, What am I doing here I want to run inner join in Codeigniter. Now, What happening when I hit this query on phpmyadmin it shows wrong data i.e. I have two rows in draft_registration and one row in registration table but it always shows two table which is wrong and my query looks like when I was print as mention below:
SELECT *
FROM `registration`
INNER JOIN `draft_registration` ON `registration`.`user_id`= `draft_registration`.`user_id`
WHERE `registration`.`user_id` = '20181121064044'
So, How can I resolve this issue? Please help me.
Thank You
$this->db->select('*'); //This code get all rows from both table.If you want a particular row you mention the column name.
For example:
$this->db->select('registration.name,draft_registration.city,draft_registration.state');
Specify column that you want to select. Or if you want select all column of your table, you can use :
SELECT registration.* with backticks `` on column name
Use the Below Code
public function draft_post($idd)
{
$this->db->select('registration.*,draft_registration.*');
$this->db->from('registration');
$this->db->join('draft_registration', 'registration.user_id= draft_registration.user_id');
$this->db->where('registration.user_id', $idd);
$query = $this->db->get();
$result = $query->result_array();
return $result;
}
Or you can use with objects
public function draft_post($idd)
{
$this->db->select('a.*,b.*');
$this->db->from('registration a');
$this->db->join('draft_registration b', 'a.user_id= b.user_id');
$this->db->where('a.user_id', $idd);
$query = $this->db->get();
$result = $query->result_array();
return $result;
}
using code igniter! I have two tables student and student_class with foreign key student_id, i want to pick data which exists on student table but not found on class_student
here is my sql
function student_class(){
$this->db->SELECT ('student.student_id, student.firstname, student.middlename, student.lastname');
$this->db->FROM('student');
$this->db->WHERE('student.status',0);
$this->db->JOIN('student_class', 'student_class.student_id=student_class.student_id', 'left');
$this->db->where_not_in('student_class.student_id');
$query =$this->db->get();
return $query->result_array();
}
it does not work out!!
can i get help..
Try like this..
First find all student ids that are matched with student_class table.Then use $this->db->where_not_in to get your required result.
function student_class(){
$this->db->select ('student.student_id');
$this->db->from ('student');
$this->db->join('student_class', 'student.student_id=student_class.student_id', 'left');
$this->db->where('student.status',0);
$data = $this->db->result_array();//array of matched id's
$this->db->select('student_id,firstname, middlename,lastname');
$this->db->from('student');
$this->db->where_not_in($data);
$query = $this->db->get();
return $query->result_array();
}
Hope it will works.
Hello i want to join three tables but it fetch all data from user table, i just want firstname and lastname parameter in that
Here is my join query. i want something like join(user.firstname).
$this->db->select('*');
$this->db->from('post');
$this->db->join('user', 'user.id = post.cop_id');
$this->db->join('source', 'post.source_id = source.id');
$query = $this->db->get();
return $query->result();
You can do something like this:
$this->db->select('post.*, source.*, user.firstname, user.lastname');
$this->db->from('post');
$this->db->join('user', 'user.id = post.cop_id');
$this->db->join('source', 'post.source_id = source.id');
$query = $this->db->get();
return $query->result();
The table.* indicates that you want all the fields from that table.
change $this->db->select('*');
to $this->db->select('user.firstname, user.lastname');
You can define that in the select:
$this->db->select(['post.id', 'post.title', 'post.description', 'user.firstname']);
Take a look at this answer https://stackoverflow.com/a/15402766/1897484
I have two functions that I am using 2 different queries. I need to make one function that will retrieve the number of views for an item. Below are the two functions:
public function products_views(){
$this->db->select('*');
$this->db->from('products');
$this->db->order_by('view_count', 'DESC');
$query = $this->db->get();
return $query->result();
}
public function getViewCount($product_id) {
$this->db->select('COUNT(*) AS cnt');
$this->db->from(views);
$this->db->where('product_id', $product_id);
$query = $this->db->get();
return $query->row()->cnt;
}
I want a query that will return all the total view count for each product from the views table and display all the products from the products table showing the total view count.
You need to use JOIN for tables products and views connecting products.id with views.product_id. As a result, the request should look like this:
SELECT products.id, COUNT(views.id) as cnt
FROM views JOIN product ON products.id = views.product_id
GROUP BY views.product_id
You need to interpret this request using your active records.
hi everyone i am new to codeigniter and currently working on a small project in the project i am trying to join two tables and display there data in single table. i looked at the user guide that codeigniter has an i am not sure how this work
$this->db->join();
what table should be first and what id key should be firs. Can someone explain me more in detail about this please use examples if u can. I am trying to join credential table and tblanswers. Tnx for answering.
i have tried to code a function using this example:
$this->db->select('*');
$this->db->from('blogs');
$this->db->join('comments', 'comments.id = blogs.id');
$query = $this->db->get();
EDIT:
instead of using join method in codeigniter is it possible to use a simple function to retrieve the two table data separately? all i want is to echo the data from database table on to a html table in my website page to be displayed is it possible to write two get functions to retrieve two tables separately ?
It doesn't matter what table is first... Simply:
<?php
$this->db->select('t1.name, t2.something, t3.another')
->from('table1 as t1')
->where('t1.id', $id)
->join('table2 as t2', 't1.id = t2.id', 'LEFT')
->join('table3 as t3', 't1.id = t3.id', 'LEFT')
->get();
?>
here is how it works:
suppose we have two tables namely student, library.
note: but remember that one of the column should match if you want to use where condition/ here we assume that both tables have std_id column
Write the the select query as follows, in the brackets write what are all the things you want
note:write as shown below don't put quotes to each single one put it on whole at once.
*note: suppose we want name, phone_no. from student table and book_name form library table.*
$this->db->select('name, phone_number, book_name');
Now write the from query and write one of the table name(No rule)
$this->db->from('student');
Now join this with the another table with join query
$this->db->join('library', 'students.std_id=library_std_id');
Now write the where condition that like you want book name form library table where std id=1(in practical you need to fetch this id from view/database)
$this->db->where('std_id', 1);
$q= $this->db->get();
That's it it's done now you can print and check the result.
$this->db->join('comments', 'comments.id = blogs.id');
With this line you tell: search me inside comments all comments with id equal blogs.id.
Usually is something like that I think:
$this->db->join('comments', 'comments.blogs_id = blogs.id');
You have to insert into your table a field named blogs_id (int value unisgned) because blogs can have more comments.
Isn't important the position of first or second value
Hi this will work for joining two tables in codeIgnator.
$this->db->select("chat.id,chat.name,chat.email,chat.phone,chat.date,post.post");
$this->db->from('chat');
$this->db->join('post', 'chat.id = post.id');
$query = $this->db->get();
if($query->num_rows() != 0)
{
return $query->result();
}
else
{
return false;
}
You can change to the query as you like do trail and error method to get your appropriate results.
This is my code for joint many tables as possible.
I have 3 tables professeurs,publications and support.
public function toutesdonnées(){
$this->db->select("*");
$this->db->from('publication');
$this->db->join('support', 'publication.idsup = support.idsup');
$this->db->join('professeurs', 'publication.emailprof = professeurs.emailprof');
$query = $this->db->get();
if($query->num_rows() != 0)
{
return $query->result();
}
else
{
return false;
}