Grails 3.x multiple datasources - grails

Question

Back in Grails 2.x world I could create multiple dataSources in an environment:
development {
dataSource {
...
}
dataSource_new {
...
}
}
and reference them in the controller:
def db = new SQL(dataSource_new)
and everything worked awesome. In Grails 3.x, everything is not awesome:
development:
dataSource:
...
dataSource_new:
...
and calling
def db = new SQL(dataSource_new)
throws:
Ambiguous method overloading for method groovy.sql.Sql#
Anyone have success with this (or can point out what's changed that I've missed)?
Tried mapping in domain with no luck:
class abc {
String ...
static mapping = {
datasource: ['DEFAULT', 'dataSource_new']
}
throws:
Ambiguous method overloading for method groovy.sql.Sql#<init>. Cannot resolve which method to invoke for [null] due to overlapping prototypes between: [interface java.sql.Connection] [interface javax.sql.DataSource]

Answer 1

I work with multiply datasources in Grails 3.x like following:
assuming you have configuration:
development {
dataSources {
dataSource {
url = 'your_url'
password = 'psw'
...
}
second {
url = 'you_url_2'
password = 'psw2'
...
}
}
So in a service you will have mapped data source like this:
dataSource_second
And to create Sql instance you will need to do the following:
def sql = new Sql(dataSource_second)
It works in Grails 3.0.11.
Hope it will help.

Answer 2

In official docs you can find an example for injecting datasource into service:
https://grails.github.io/grails-doc/latest/guide/single.html#multipleDatasources
class DataService {
static datasource = 'lookup'
void someMethod(...) {
//…
}
}
or into command:
http://grails.github.io/grails-doc/latest/guide/upgrading.html
import grails.dev.commands.*
import javax.sql.*
import groovy.sql.*
import org.springframework.beans.factory.annotation.*
class RunQueryCommand implements ApplicationCommand {
#Autowired
DataSource dataSource
boolean handle(ExecutionContext ctx) {
def sql = new Sql(dataSource)
println sql.executeQuery("select * from foo")
return true
}
}
Moreover look at this thread and quoted examples: https://github.com/grails/grails-core/issues/701