Django ORM queryset substring on a column

[BIJAL MANIAR]

Hello,

Consider below column in mysql table Employee. I need to write django orm query for below mysql query.

emp_number

4-DEF-A111

3-MNO-333

2-DEF-222

1-ABC-111

Mysql query which splits by '-' and matches against last index.

SELECT * from Employee WHERE substring_index(emp_number, '-', -1) = '111';

I cannot write endswith on a column like below:

Employee.objects.filter(emp_number__endswith='111').values('emp_number')

This will return below 2 records:

4-DEF-A111

1-ABC-111

 Any help would be appreciated. Thanks.

-Bijal

[BIJAL MANIAR]

Hello,

Can anyone please help with this.

Thanks,

Bijal

[Krishnasagar Subhedarpage]

You can try with __contains queryset.

Regards,

Krishnasagar Subhedarpage

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[Simon Charette]

You can use a Func expression for this purpose[0]

Employee.objects.annotate(

    emp_number_suffix=Func('emp_number', Value('-'), -1, function='substring_index'),

).filter(

    emp_number_suffix='111',

).values('emp_number')

Cheers,

Simon

[0] https://docs.djangoproject.com/en/2.1/ref/models/expressions/#func-expressions

[Todor Velichkov]

You said you cannot use `endswith` because `-A111` and `-111` will match, well what about just use endswith='-111' ?