Question

I am working with a simple database. It has three columns. _id (integer primary key autoincrement), jobnumber (text unique not null) and jobpart (text not null).

I am using a dialog with two EditText widgets to get the input and upon button press add it to the database.

When I enter a jobnumber but leave the jobpart empty I would expect that the record would not be added. However, it is being added and I get a blank jobpart. I was using “insert”. Looking, I thought perhaps I needed to use “insertWithOnConflict” instead, but that didn’t seem to make a difference, the same thing happened.

My next thought was perhaps an empty string did not count as a null value, so I tried the following:

if (jobpart == "") {
    jobpart1 = null;
}else{
    jobpart1 = jobpart;
}

Same thing happened, the database didn’t even hiccup and put an empty slot in.

So I started looking through the SQL documentation. I’m wondering if I need to set the db into strict mode, as perhaps an implicit default is being used? Although the section I found that in related to servers, so I’m not sure it even applies here, and if it does, how and when I would do it. (At db creation? On db open?).

Any pointers appreciated.

Answer 1

When you compare strings you need to user the equals() method, not == as String is an object so == just compares pointers.

i.e. You want:

if (jobpart.equals("")) {