Android SQLite query where column is not null and not empty

Question

I cannot figure out the syntax for the .query call. I need to select all records that match a certain column that do not have a null or empty value for a second (different) column

my best attempt:

Cursor cursor = mDatabase.query(DatabaseOpenHelper.TABLE_ROOMS, mAllColumns,
    DatabaseOpenHelper.KEY_ROOM_HOSPITAL_ID
    + " =? AND " + DatabaseOpenHelper.KEY_ISO + " IS NOT NULL OR NOT ?",
    new String[]{String.valueOf(hospitalId), ""}, null, null, null);

This is returning ALL records. If I use AND in place of OR, it returns records matching hospitalId, but ignores the NOT NULL OR NOT "" part.

Any tips? Should I use a rawQuery call?

score 70 · Accepted Answer · edited Aug 29 '17 at 11:54

70

I believe the correct syntax would be:

AND key IS NOT NULL AND key != ""

where key is your column

edited Aug 29 '17 at 11:54

Koopakiller

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answered Jul 12 '15 at 22:15

BladeCoder

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score 6 · Answer 2 · answered Jun 05 '19 at 16:33

6

If multiple spaces can be in your column and you also want to treat them as empty values use TRIM

column_name IS NOT NULL AND TRIM(column_name," ") != ""

answered Jun 05 '19 at 16:33

Hugo Matilla

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Or even TRIM(column_name) since space is used as the trim character by default. – vonWippersnap Feb 05 '21 at 05:10

Android SQLite query where column is not null and not empty

2 Answers2

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