Insert if not exists?

I'm prompting a user to add an item to an SQLiteDb. When they click add, I want to check if that item already exists... if it doesn't then I want to insert it.

I make the call

mDbHelper.createNote(inputLine.getText().toString().trim(), mTable[i]);

Which calls...

public long createNote(String value, String table) {
        ContentValues initialValues = new ContentValues();
        initialValues.put(table, va开发者_开发问答lue);

        return mDb.insert(table, null, initialValues);
    }

Thats works but it doesn't check if the item already exists, so it still inserts duplicates. So I tried

return mDb.insertWithOnConflict(table, null, initialValues, SQLiteDatabase.CONFLICT_FAIL);

However, it doesn't appear to recognize insertWIthOnConflict or SQLiteDatabase.CONFLICT_FAIL...

How can I get this to work?

Edit: it's 1 table, 2 rows. table name = note, rows = _id, note.

Use the REPLACE command

In such situation I perfrom such checking:

if (!checkRecordExist(DATABASE_TABLE, new String[] {KEY_1, KEY_2}, new String[] {value_1, value_2})) 
database.insert(DATABASE_TABLE, null, updateValues);

where

private boolean checkRecordExist(String tableName, String[] keys, String [] values) {
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < keys.length; i++) {
        sb.append(keys[i])
            .append("=\"")
            .append(values[i])
            .append("\" ");
        if (i<keys.length-1) sb.append("AND ");
    }

    Cursor cursor = database.query(tableName, null, sb.toString(), null, null, null, null);
    boolean exists = (cursor.getCount() > 0);
    cursor.close();
    return exists;
}

Add a Primary Key. If you try to insert another row with the same key, the insert will fail.

Have you tried using a primary key that isn't set to auto-increment? That might be why the REPLACE command isn't working