Skip to main content


Last week, when using the GROUP_CONCAT() function on a MySQL database, I got an unexpected result. :(

Indeed, instead of getting my result as VARCHAR types, I got it as BLOB types! For information, a BLOB is a binary large object that can hold a variable amount of data:
Because BLOB values are treated as binary strings, it is not easy to use. This is why we would prefer to have VARCHAR values.

So the question is how to get around this frustrating problem?

The answer is, for once, very simple! :D
You simply need to:

Open your my.ini or my.cnf file;
Change the value of the group_concat_max_len system variable to 512 (no ‘k’ suffix);
Restart the mysql service

To verify if the value has been successfully updated, execute the following command in your mysql client:
mysql> show variables like "%concat%";
| Variable_name | Value |
| group_concat_max_len | 512 |
1 row in set (0.00 sec)

Note that you cannot set the value of group_concat_max_len to less than 1Kb using the MySQL Administrator GUI. Which means that the only way to set this system variable to 512 (which is less than 1Kb) is to edit your MySQL configuration file as described above.


Popular posts from this blog

Odoo: Qweb Templates Cache Issue

Hi Everyone, Today I was working on a hotel booking template in Odoo and changes made in the Qweb template(.xml) were not reflecting on updating module with odoo service restart. Tried few times without any success :(. Finally, I decided to delete the old template from Odoo backend and then update module again and it worked like a charm!! :) Steps to delete template from backend: Settings --> User Interface --> Views --> Search by template name Delete the used template. Although it's a small post, but I'm sure it will meet the purpose and help someone in the future. Thanks!!! Enjoy Programming!! :) Reference Links: ===================================

Odoo12/13: Add an extra action in the tree view action button

This post will help you to add an action window in Odoo. Odoo13: <act_window id="action_make_bank_payment"              name="Do Bank Payment"              res_model="account.ob.payment"              binding_model="account.move"              view_mode="form"              target="new"              binding_views="list,form"              domain="[('type','=', 'in_invoice')]"              groups="account.group_account_user" /> Odoo12: <act_window id="action_make_bank_payment"              name="Do Bank Payment"              res_model="account.ob.payment"             view_mode="tree,form"              domain="[('type','=', 'in_invoice')]"              groups="account.group_account_user" /> Thanks!!! Enjoy Programming!! :) Reference:

Odoo/OpenERP: one2one relational field example

one2one relational field is deprecated in OpenERP version>5 but you can achieve the same using many2one relational field. You can achieve it in following two ways : 1) using many2one field in both the objects ( ) 2)  using inheritance by deligation You can easily find the first solution with little search over internet so let's start with 2nd solution. Scenario :  I want to create a one2one relation between two objects of openerp hr.employee and hr.employee.medical.details What I should do  i. Add _inherits section in hr_employee class ii. Add field medical_detail_id in hr_employee class class hr_employee(osv.osv):     _name = 'hr.employee'     _inherits = {' hr.employee.medical.details ': "medical_detail_id"}     _inherit = 'hr.employee'         _columns = {              'emp_code':fields.char('Employee Code', si