Question

Code in the controller

    def sql = groovy.sql.Sql.newInstance ( dbUrl, dbUser, dbPassword, dbDriver )
    String[] allUser = sql.rows("select user_id from users")
    allUser.each()
    {
        print "${it}"
    }

The output in the console

{user_id=9}
{user_id=10}
{user_id=11}
{user_id=12}
{user_id=13}
{user_id=14}

How do I print it in such a way that it will display just the value? Example:

9
10
11
12
13
14

Answer 1

This makes it a bit more intricate than it needs to be. Sql.rows() will return a list of GroovyRowResult objects, which make it easy to retrieve the fields; you have an implicit cast to String[], based on your variable declaration. You can change it as follows:

def allUser = sql.rows("select user_id from users") 

or, if you prefer,

List allUser = sql.rows("select user_id from users")  

Then you can print the userid’s like so:

allUser.each {
    println it["user_id"]
}