How to check if a column is existed?

[zhenghongyi]

In FMDB, there is a api 'columnExists:inTableName:', to check if a column is existed in a table, before i add a new column to the table. Now, How to do this with the SQLite.swift? I let the db execute the 'PRAGMA table_info(MyTable)', but it return no elements. Wish to reply, Thanks!