multiple datasinks in one test step.

Yes, We can do it. Put all the results and iterate using for loop and store inside DataSink like this:-

int j

def result = "get it from JDBC and iterate through all the results and store inside result"

for(int i=0; i<result.size(); i++) {

testRunner.testCase.testSteps["DataSink"].setPropertyValue(result[j], Value) //where "j" will give you the number of result

}