Question

i have a problem with double values i need to store in an android homed sqlite database. since these double values represent gps values (lat & lng), i really NEED an absolute precision down to the 9th number after the comma.

now i have a table like this:

CREATE TABLE x REAL lng;

and insert sth (hardcoded) like:

INSERT INTO x lng = '1.0';

and when reading lng from this table into some (java) double variable, i get a value like “0.999956837” – this renders the values pretty useless to me.

is there a way to enforce the precision i need other than storing the values as “text” fields (what would make expensive casts neccessary) or storing them as integers (meaning i need to multiply/divide at each write/read-op)?

Answer 1

SQLite is typeless, that means all representation is written as text, probably the wrapper api does some converts you don’t know of, that you get those results.

If you need to store the data as string do it.

Just when you read out the double make sure you saved in the right format, you can use getDouble on the column.