Question

First of all, please bear with me, I have minimal experience with SQLite. I am writing an app in Java for the Android platform and I’ve run into an issue while attempted to query a SQLite database.

I have implemented a database and I am unsure of how to write a method which returns a cursor of only specific rows with a certain value in a certain column. Say there is a column titled “date”, I would like to write a method which returns all the columns that do not have the value string “null” in the “date” column.

I know how to write a fetchAll() method and how to write a fetch() for specific rows given an ID, but I not multiple specific rows.

If anyone can help me it would be greatly appreciated.

Answer 1

These will return all the row where Date!=null

public Cursor fetch() 
        {
            return db.query(DATABASE_TABLE,
                    null, 
                    DATE + "!=''",
                    null,
                    null, 
                    null, 
                    null);                        


        }

If you don’t need all columns then use

public Cursor fetch() 
            {
                return db.query(DATABASE_TABLE,new String[] {
                    DATE,
                    TIME
                    },                        
                        DATE + "!=''",
                        null,
                        null, 
                        null, 
                        null);                           


            }