how to read a specific column from existing SQLiteBatabase in Android?

I have a database having 28 rows just for saving app data. My goal i开发者_C百科s to read One specific column (not one value) from it.

However, I don't want to read all columns at once, because it's slow as I have blob's in db too. Instead, I'd like to read just one column at a time, separately. Can you plese help me to solve this problem.

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If you want to read one ROW do something along those lines:

SELECT * FROM tablename WHERE id='5' LIMIT 1;

where 'id' is supposer do be in the table 'tablename' or else try something like this:

SELECT datafield FROM tablename WHERE 1;

which will give you all the 'datafield' data from the table (ie. a Column).

If this doesn't help you at all then post the code you are already using.