Map<String, Object> map = runtimeService.getVariables(task.getExecutionId());

protected DeploymentWithDefinitions doExecute(final CommandContext commandContext) {
??DeploymentManager deploymentManager = commandContext.getDeploymentManager();


??// load deployment handler
??ProcessEngine processEngine = commandContext.getProcessEngineConfiguration().getProcessEngine();
??deploymentHandler = commandContext.getProcessEngineConfiguration()
??????.getDeploymentHandlerFactory()
??????.buildDeploymentHandler(processEngine);


??Set<String> deploymentIds = getAllDeploymentIds(deploymentBuilder);
??if (!deploymentIds.isEmpty()) {
????String[] deploymentIdArray = deploymentIds.toArray(new String[deploymentIds.size()]);
????List<DeploymentEntity> deployments = deploymentManager.findDeploymentsByIds(deploymentIdArray);
????ensureDeploymentsWithIdsExists(deploymentIds, deployments);
??}


??checkCreateAndReadDeployments(commandContext, deploymentIds);


??// set deployment name if it should retrieved from an existing deployment
??String nameFromDeployment = deploymentBuilder.getNameFromDeployment();
??setDeploymentName(nameFromDeployment, deploymentBuilder, commandContext);


??// get resources to re-deploy
??List<ResourceEntity> resources = getResources(deploymentBuilder, commandContext);
??// .. and add them the builder
??addResources(resources, deploymentBuilder);


??Collection<String> resourceNames = deploymentBuilder.getResourceNames();
??if (resourceNames == null || resourceNames.isEmpty()) {
????throw new NotValidException("No deployment resources contained to deploy.");
??}


??// perform deployment ??
??DeploymentWithDefinitions deployment =?commandContext.runWithoutAuthorization(() -> {
????acquireExclusiveLock(commandContext);
????DeploymentEntity deploymentToRegister = initDeployment();
????Map<String, ResourceEntity> resourcesToDeploy =
????????resolveResourcesToDeploy(commandContext, deploymentToRegister);
????Map<String, ResourceEntity> resourcesToIgnore = new HashMap<>(deploymentToRegister.getResources());
????resourcesToIgnore.keySet().removeAll(resourcesToDeploy.keySet());


????// save initial deployment resources before they are replaced with only the deployed ones
????CandidateDeployment candidateDeployment =
????????CandidateDeploymentImpl.fromDeploymentEntity(deploymentToRegister);
????if (!resourcesToDeploy.isEmpty()) {
??????LOG.debugCreatingNewDeployment();
??????deploymentToRegister.setResources(resourcesToDeploy);
??????deploy(commandContext, deploymentToRegister);
????} else {
??????// if there are no resources to be deployed, find an existing deployment
??????String duplicateDeploymentId =
??????????deploymentHandler.determineDuplicateDeployment(candidateDeployment);
??????deploymentToRegister =
??????????commandContext.getDeploymentManager().findDeploymentById(duplicateDeploymentId);
????}


????scheduleProcessDefinitionActivation(commandContext, deploymentToRegister);


????if(deploymentBuilder instanceof ProcessApplicationDeploymentBuilder) {
??????// for process application deployments, job executor registration
??????// is managed by the ProcessApplicationManager
??????ProcessApplicationRegistration registration = registerProcessApplication(
??????????commandContext,
??????????deploymentToRegister,
??????????candidateDeployment,
??????????resourcesToIgnore.values());


??????return new ProcessApplicationDeploymentImpl(deploymentToRegister, registration);
????} else {
??????registerWithJobExecutor(commandContext, deploymentToRegister);
????}


????return deploymentToRegister;
??});


??createUserOperationLog(deploymentBuilder, deployment, commandContext);


??return deployment;
}


public <T> T runWithoutAuthorization(Callable<T> runnable) {
??CommandContext commandContext = Context.getCommandContext();
??boolean authorizationEnabled = commandContext.isAuthorizationCheckEnabled();
??try {
????commandContext.disableAuthorizationCheck();
????return runnable.call();
??} catch (RuntimeException e) {
????throw e;
??} catch (Exception e) {
????throw new ProcessEngineException(e);
??} finally {
????if (authorizationEnabled) {
??????commandContext.enableAuthorizationCheck();
????}
??}
}

public VariableMap execute(CommandContext commandContext) {
??ensureNotNull("executionId", executionId);


??ExecutionEntity execution = commandContext
????.getExecutionManager()
????.findExecutionById(executionId);


??ensureNotNull("execution " + executionId + " doesn't exist", "execution", execution);


??checkGetExecutionVariables(execution, commandContext);


??VariableMapImpl executionVariables = new VariableMapImpl();


??// collect variables from execution ?核心方法
??execution.collectVariables(executionVariables, variableNames, isLocal, deserializeValues);


??return executionVariables;
}

?

?

//?selectVariablesByExecutionId 对应执行的SQL语句
SELECT RES.*,
???????( case when RES.TASK_ID_ is not null and RES.EXECUTION_ID_ is not null then EXECUTION.ACT_INST_ID_
???????????when RES.CASE_EXECUTION_ID_ is not null then RES.CASE_EXECUTION_ID_ when EXECUTION.PARENT_ID_ is null
??????????and RES.IS_CONCURRENT_LOCAL_ = 0 then EXECUTION.ID_ when EXECUTION.IS_SCOPE_ = 1 and EXECUTION.PARENT_ID_ is not null
??????????and RES.IS_CONCURRENT_LOCAL_ = 0 then PARENT_EXECUTION.ACT_INST_ID_ else EXECUTION.ACT_INST_ID_ end ) ACT_INST_ID_
FROM ACT_RU_VARIABLE RES LEFT JOIN ACT_RU_EXECUTION EXECUTION ON RES.EXECUTION_ID_ = EXECUTION.ID_
????LEFT JOIN ACT_RU_EXECUTION PARENT_EXECUTION ON EXECUTION.PARENT_ID_ = PARENT_EXECUTION.ID_
WHERE EXECUTION_ID_ = '54854e59-a5c7-11ec-a5f8-92b1d713a145' AND TASK_ID_ is null