Execute SQLs

Example code is available on github.com/vaadin-on-grails/groovy-sql.

TODO: steps how to create entities...

In order to execute a query with Groovy Sql just get dataSource bean from the application context, which we have created it in Create Sql article.

import com.vaadin.ui.UI
import com.vaadin.ui.VerticalLayout
import com.vaadin.server.VaadinRequest
import com.vaadin.ui.Label
import com.vaadin.grails.Grails
import groovy.sql.GroovyResultSet
import groovy.sql.Sql

class MyUI extends UI {

    @Override
    protected void init(VaadinRequest vaadinRequest) {
        VerticalLayout layout = new VerticalLayout()

        Sql sql = Grails.get(Sql)
        sql.eachRow("SELECT * FROM User") { GroovyResultSet result ->
            String firstName = result.getString('username')
            layout.addComponent(new Label(firstName))
        }

        setContent(layout)

        // Sql sql = new Sql(dataSource: Grails.applicationContext.getBean('dataSource'))
        // execute your queries
        // sql.close()
    }
}

Constructing SQL strings in Java or Groovy code is not easy and it is, for some of us, annoying. I recommend to use jOOQ library to construct SQL strings.