SoapUI installation also provides command line tools(%SOAPUI_HOME%/bin/testrunner.bat) to execute the SoapUI project / test suite / test case. Please check here
And windows scheduler task allows to run the commands. So you are good.
Coming to the actual problem, i think, saving the response xml of jdbc test step is easily possible with below script.
Add this script as Script Assertion to the JDBC Request step itself: And provide the directory for path variable in the script.
//Check if there is response
assert context.request, "Request is empty or null"
//Update the below value
def path = '/directory/path/to/store/responses'
def name_prefix = java.time.LocalDate.now().toString()
//Save the contents to a file
def saveToFile(file, content) {
if (!file.parentFile.exists()) {
file.parentFile.mkdirs()
log.info "Directory did not exist, created"
}
file.write(content)
assert file.exists(), "${file.name} not created"
}
def f = new File("${path}/${name_prefix}_Response.xml")
saveToFile(f, context.response)
Try to execute the SoapUI project using command line and ensure response is saved before putting that into windows scheduler.
NOTE: the above script saves the response with today's date as prefix in its file name.