Is it possible to apply primary key on the text fields in android database

Question

I have created a simple table that contains the name and email id\'s of the persons. When i am giving the create query like this:

\"create table contacts (name

Answer 1

as per the faq of sqlite documentation, using TEXT as a datatype for primary key should work.

i used your query and here it is, the table is created.

CREATE TABLE contacts ( email text primary key not null, name text not null);

INSERT INTO contacts VALUES ('sample@email.com', 'sample')
INSERT INTO contacts VALUES ('people@email.com', 'sample')

now here is where it went wrong.

when i ran this again

INSERT INTO contacts VALUES ('sample@email.com', 'sample')

nothing happened, no errors. But it did not update the record. so i conclude data integrity is there but you don't get any feedback about the failure.

Answer 2

SQLiteDatabase.insertOrThrow() should throw an exception if the value could not be inserted. Also its return values, as well the one from SQLiteDatabase.insert() is the rowid of the inserted row or -1 if it fails. You should opt for any of these alternatives in your code.