/**
 * Created by Vaggelis on 26/7/2017.
 */

import groovy.sql.Sql
// import grails.util.Holders.ConfigurationHolder as CH
// PRODUCED ERROR: Error:(6, 1) Groovyc: unable to resolve class grails.util.Holders.ConfigurationHolder


static void main(String[] args)
{
    def sql = Sql.newInstance("jdbc:mysql://localhost:3306/test", "root","", "com.mysql.jdbc.Driver")

    // delete the table
    sql.execute('drop table users')

    //Create table users
    sql.execute('create table users(id INT NOT NULL AUTO_INCREMENT,name VARCHAR(15) NOT NULL,email VARCHAR(15), PRIMARY KEY(id))')

    //Insert some values
    sql.execute('insert into users values(null,"John Doe","jd@test.com")')
    sql.execute('insert into users values(null,"Joe Parker","jp@test.com")')
    sql.execute('insert into users values(null,"Tom Pecker","tp@test.com")')

    //We can also insert by prepared statements by
    sql.execute('insert into users values(null,?,?)',['Jill Peter','jill@test.com'])

    //Or for better reuse
    def InsertQuery = "insert into users values(null,?,?)"
    sql.execute(InsertQuery,['Harry Costa','hc@test.com'])

    //Print single row
    println "\n------------------------------Print Single Row--------------------------------------------------------\n"
    def row = sql.firstRow('select * from users where name = "John Doe"')
    println "Row: id = ${row.id} and email = ${row.email}"

    //Printing Multiple rows with rows (user handles each row with each)
    println "\n------------------------------Print Multiple Rows (using rows)----------------------------------------\n"
    println "ID    NAME         EMAIL"
    def fetch = sql.rows("select * from users")
    fetch.each { it ->
        println it.id + " " + it.name + " " +it.email
    }

    //Printing Multiple rows with eachRow (closure passed in as the second parameter should handle each row)
    println "\n------------------------------Print Multiple Rows (using eachRow)-------------------------------------\n"
    sql.eachRow("select * from users") { printrow ->
        println "$printrow.id $printrow.name $printrow.email"
    }

    //Delete a row
    println "\n------------------------------Delete an entry from table----------------------------------------------\n"
    sql.execute('delete from users where id = ?' , [5])
    printDbValues(sql)

    //Update a value
    println "\n------------------------------Update an entry in table------------------------------------------------\n"
    sql.executeUpdate('update users set email = ? where id=4', ["pj@test.com"])
    printDbValues(sql)

    //Define a function for print reuse
    println "\n------------------------------------------------------------------------------------------------------\n"

}

def printDbValues(sql)
{
    sql.eachRow("select * from users")
            {
                printrow ->
                    println "$printrow.id $printrow.name $printrow.email"
            }
}