Initialising parameters with jdbc feeder

Gatling (Open-Source)
1

Hi,

For me to start my stress run, i have to get lot of parameters from DB by executing n number of sql queries.

for this what i have done is

created a file named BasicSimulation .scala and the file is as below.

`

import io.gatling.core.Predef._
import io.gatling.http.Predef._
import io.gatling.jdbc.Predef._
import scala.concurrent.duration._
import Headers._
import MysqlDataFeeder._

class BasicSimulation extends Simulation {

val urlHost = System.getProperty(“URL_HOST”)
val nbUsers:Int = java.lang.Integer.getInteger(“users”, 1)
val myRamp:Long = java.lang.Long.getLong(“ramp”, 0L)

val jsonFileFeeder = jsonFile(“StressData.json”).circular

val httpProtocol = http
.baseURL(urlHost)
.acceptHeader("/")
.acceptEncodingHeader(“gzip,deflate,sdch”)
.acceptLanguageHeader(“en-US,en;q=0.8”)
.connection(“keep-alive”)
.userAgentHeader(“Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.146 Safari/537.36”)

val scn = scenario(“Sample”)
.feed(jdbcFileFeeder)
.exec(http(“Authentication”)
.post("""/authenticator""")
.headers(headers_1)
.header(“Developerid”, “${userName}”)
.header(“Developerpassword”,"${secondaryPassword}")
.header(“Origin”, “urlHost”)
.check(jsonPath("$.token").saveAs(“tokenId”))
.check(status.is(200)))

setUp(scn.inject(rampUsers(nbUsers) over (myRamp seconds)).protocols(httpProtocol))

}

`

and then created a seperate scala file named "MysqlDataFeeder.scala and file is as below

`

import io.gatling.core.Predef._
import io.gatling.http.Predef._
import io.gatling.jdbc.Predef._
import scala.concurrent.duration._

object MysqlDataFeeder {

val jdbcFileFeeder = jdbcFeeder(“jdbc:mysql://#########/#######”, “#######”, “#######”, “##########################################”)

}
`

I am able to get the values from the sql query.

but i dont want to do it as a feeder, as i want these queries to execute only during the start up and store the values for the rest of the session. ( like the init method we have in JAVA )

but i need to execute it only once prior to start up of the run and to use those values in my entire simulation ( like these values doesnt change with respect to user)

do we have any other way of achieving this?

Thanks,
Sujatha

2

And also, do we have any methodology to execute n number of sqls in a effective way?

3

Hi Sujatha,

There is nothing to do to achieve this, as this the feeder’s behavior : at the point your simulation starts, the JDBC feeder would have already retrieved your data from the database.
What you should know is that in Scala, every code written directly in the class/object body is, in fact, inside the class constructor.

Cheers,

Pierre

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