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Table doesn't exist error in Django when using two databases

By : le-moon
Date : August 02 2020, 12:00 AM
will help you You need to pass the .using(..) [Django-doc] to the queryset, not after the get_object_or_404(..)[Django-doc], since then it is too late: the query is then already done. So:
code :
data = get_object_or_404(MyModel.objects.using('second'), ticker=ticker)

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Query from two databases where a table might not exist in either of the databases

By : Renee Croston Human
Date : March 29 2020, 07:55 AM
it should still fix some issue The names used in a query must exist at the time when the SQL optimizer tries to plan the execution of the query. If they don't, you will get back rude messages about the relevant table or column not existing. There isn't any standard way around this. And it is highly unlikely there's a non-standard way around this either.
At least, no way around it that takes the query text verbatim. If you're prepared to do the system catalog queries (either through the native system catalog tables or via the information schema, which is more or less standardized), then you can decide how to build the query at runtime, so that it has a maximal chance of succeeding. This is an unusual requirement; few programs are designed to tolerate such deviations from the expected norm for the database to which they connect.

using multiple databases in django and get table doesn't exist error

By : Hardwood Bao
Date : March 29 2020, 07:55 AM
it fixes the issue I overrode the routing class as mentioned here:
code :
class AuthRouter(object):
    A router to control all database operations on models in the
    auth application.
    def db_for_read(self, model, **hints):
        Attempts to read auth models go to auth_db.
        if model._meta.app_label == 'auth':
            return 'auth_db'
        return None

    def db_for_write(self, model, **hints):
        Attempts to write auth models go to auth_db.
        if model._meta.app_label == 'auth':
            return 'auth_db'
        return None

Why am i getting a column doesnt exist error with the name of the table

By : Chow hoo tuck
Date : March 29 2020, 07:55 AM
seems to work fine Put aa1000 into single quotes ('aa1000'):
Your SQL query should look like:
code :
Select Train_name From Train_list Where Train_no='aa1000'
"Select Train_name From Train_list Where Train_no='"+message.substring(0,(message.length()-3))+"'";

Django 1.4 Multiple Databases Foreignkey relationship (1146, "Table 'other.orders_iorder' doesn't exist")

By : xxxxxxxxxxxxxxxxxx
Date : March 29 2020, 07:55 AM
I hope this helps you . I already resolved my issue changing super(Order,self).delete() with a raw SQL delete command. Anyway I would love to know if there is a more proper way of doing this

MySQL error 'Key Column doesnt exist in table'

By : jrheinlaender
Date : March 29 2020, 07:55 AM
With these it helps The error statement is clear. You do not have a column named 'm_no' in your rental table.
Is this what you were after:
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