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A replase wont work when DB name exceeds 30 characters #423

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Description

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Software versions

  • Django: 4.2.0
  • mssql-django: 1.5
  • python: 3.11
  • SQL Server: 18
  • OS: debian

Problem description and steps to reproduce
precondition
A db name should be more than 30 characters lenght, e.g. aaa0123456789012345678901234567890123456789

code
when I'd run the code. below

MyObject.objects.filter(some_field="some value")
.update(some_field=Replace("some_field", Value('value'), Value('data')))

When run the code above I've got exception like this one #420 (comment)

the issue with the DB name and sqlserver_replace
the SQL QUERY
SELECT CONVERT(varchar, DATABASEPROPERTYEX(CONVERT(varchar, (SELECT DB_NAME())), 'collation'))
is truncate DB name to 30
e.g.

select 
      CONVERT(varchar, 'aaa0123456789012345678901234567890123456789') as a, 
                   len('aaa0123456789012345678901234567890123456789') as b, 
  len(CONVERT(varchar, 'aaa0123456789012345678901234567890123456789')) as c

will return

a b c
aaa012345678901234567890123456 43 30

Expected behavior and actual behavior
Need to change to SELECT CONVERT(varchar(max), DATABASEPROPERTYEX(CONVERT(varchar(max), (SELECT DB_NAME())), 'collation'))

Error message/stack trace

  File "/usr/local/lib/python3.11/site-packages/django/db/models/sql/compiler.py", line 1982, in execute_sql
    cursor = super().execute_sql(result_type)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/sql/compiler.py", line 1547, in execute_sql
    sql, params = self.as_sql()
                  ^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/mssql/compiler.py", line 666, in as_sql
    sql, params = super().as_sql()
                  ^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/sql/compiler.py", line 1954, in as_sql
    sql, params = self.compile(val)
                  ^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/mssql/compiler.py", line 442, in compile
    return super().compile(node, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/sql/compiler.py", line 542, in compile
    sql, params = vendor_impl(self, self.connection)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/mssql/functions.py", line 65, in sqlserver_replace
    current_collation = default_collation.replace('_CI', '_CS')
                        ^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'replace'

Any other details that can be helpful
A db name should be more than 30 characters lenght, e.g. aaa0123456789012345678901234567890123456789

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