防止从sql更新sqlite中的特定列

Question

i am developing a twisted app which interacts with a sqlite backend, in the sqlite db there is a users table of which certain columns should not be updated if they already contain a value. one way of doing this would be to check the user table before each insert for existence of values in the columns of interest and proceed accordingly , but this will be a performance killer and people familiar with twisted will know how cumbersome this can be, can someone suggest a better way of doing this .

TIA

Answer 1

尝试INSERT语句的INSERT或IGNORE变体。