How can I filter SqlAlchemy column by number of resulting Characters,
Here is a kind of implementation I am looking at,
query = query.filter(Take_Last_7_Characters(column_1) == '0321334')
Where "Take_Last_7_Characters" fetches the last 7 characters from the resulting value of column_1
So How can I implement Take_Last_7_Characters(column_1) ??
use sqlalchemy.sql.expression.func
, to generate SQL functions.
Please use the func
to generate SQL functions as directed by @tuxuday.
Note that the code is RDBMS-dependant. The code below runs for SQLite
, which offers SUBSTR
and LENGTH
functions. Your actual database might have different names for those ( LEN, SUSBSTRING, LEFT, RIGHT
, etc).
qry = session.query(Test)
qry = qry.filter(func.SUBST(Test.column_1, func.LENGTH(Test.column_1) - 6, 7) == '0321334')
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