Kotlin Programming Cookbook

How to do it…

If you have read and implemented the previous recipe, you must already have a customers table in your database. Follow the mentioned steps to understand the difference between parseSingle and parseOpt:

1. In the previous recipe, we used parseList to get a list of rows as objects. If we need to get only a single row as an object, then we need to use parseSingle. The following is the syntax of parseSingle:

parseSingle(rowParser): T

2. Now we use it in the following way in our previous code:

btn_read.onClick {    var c = database.use {        select(Customer.TABLE_NAME)            .whereArgs("(id = {userId})",            "userId" to 1)            .parseSingle(classParser<Customer>())    }    debug(c.name + " (" + c.phone_num + ")")}

3. We are using parseSingle because we will only ...