Chapter 4: activiti RuntimeService settings get and get process variables, and the difference from taskService, set process variables when starting and completing tasks [easy to understand]

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上一章我们讲了taskServiceThe procedure for getting process variables,这里我们讲讲RuntimeServiceHow to set and get it,In fact, the process followstaskService是差不多的.

• RuntimeService Related to process instances and execution objects,The table for is：act_ru_execution
• TaskService 与任务相关 对应的表是act_ru_variable

代码如下：

/**
	 * RuntimeService设置流程变量数据
	 */
	@Test
	public void setVariableRunTimeValue(){
//		TaskService taskService=processEngine.getTaskService();//获取任务
		RuntimeService runtimeService=processEngine.getRuntimeService();
		String executionId="42501";//更加任务id知道是哪个人物,设置流程变量.可以更加查看任务方法查看任务的id,可以到数据库直接看
		//下面设置任务的内容,比如请假流程,任务的第一节点也就是申请人要写请节哀的原因
		runtimeService.setVariable(executionId, "days", 4);//请假天数
		runtimeService.setVariable(executionId, "date", new Date());//请假日期
		runtimeService.setVariable(executionId, "reason", "haha");//请假原因
		
		//下面我们再测试一个额外的知识点,就是流程传输变量,这里我们再新建一个student对象,对象有id 和name两个属性,还有就是序列化传输
		Student student=new Student();
		student.setId(1);
		student.setName("zhangsan");
		runtimeService.setVariable(executionId, "student",student);//序列化对象
		
	}
	
	/**
	 * RunTimeService获取流程变量数据
	 */
	@Test
	public void getVariableRunTimeValues(){
//		TaskService taskService=processEngine.getTaskService();//获取任务
		RuntimeService runtimeService=processEngine.getRuntimeService();
		String executionId="42501";
		Integer day=(Integer) runtimeService.getVariableLocal(executionId, "days");//获取请假天数
		Date date=(Date) runtimeService.getVariable(executionId, "date");//请假日期
		String reason=(String) runtimeService.getVariable(executionId, "reason");//请假原因
		
		Student student2=(Student) runtimeService.getVariable(executionId, "student");//序列化对象
		System.out.println("请假天数："+day);
		System.out.println("请假日期："+date);
		System.out.println("请假原因:"+reason);
		System.err.println("请假对象："+student2.getId()+",,,"+student2.getName());
	}

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执行过程是,start()启动一个流程实例,The object table is being executed at this pointact_ru_execution表生成数据,我们看看id值：

Then execute the set variable method,Look at the variable table and there will be corresponding values：

The result of executing the get variable table is the same：

请假天数：4
请假日期：Sun Apr 22 13:47:25 CST 2018
请假原因:haha
请假对象：1,,,zhangsan

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For setting multiple process variables and setting access to local variables is followed bytaskService 是一样的,New readers can refer to the blog post：

https://blog.csdn.net/csdnliuxin123524/article/details/80037416

Of course, you can also create process variables directly when you start the process：

/**
	 * Process variables are set when the process is started
	 */
	@Test
	public void RunTimeServicestart(){
		
		Student student=new Student();
		student.setId(1);
		student.setName("zhangsan");
		
		Map<String, Object> variables=new HashMap<String,Object>();
		variables.put("days", 66);
		variables.put("date",new Date());
		variables.put("reason", "faShao21111");
		variables.put("student", student);
		//Define the flow chartKEY字段值,keyThe value is what we defined earlierkey,可在act_re_procdef表中的key_字段中找到,
		//Run the startup processservicee
		ProcessInstance pi=processEngine.getRuntimeService()
		.startProcessInstanceByKey("studentLeaveProcess00",variables);
		System.out.println(pi.getId());
		System.out.println(pi.getProcessDefinitionId());
	}

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End the previous unfinished task first.Then just run the above method.

The variable table has the values ​​we set into it.

Another is to set a process variable when the character ends,This is a very common interface,For example, the first node when asking for leave,We generally set the content of the application at the end of the application task.

代码如下：

/**
	 * 完成任务时设置流程变量
	 */
	@Test
	public void completeTaskVariables(){
		Student student=new Student();
		student.setId(1);
		student.setName("zhangsan");
		
		Map<String, Object> variables=new HashMap<String,Object>();
		variables.put("days", 66);
		variables.put("date",new Date());
		variables.put("reason", "enenene2222");
		variables.put("student", student);
		processEngine.getTaskService().complete("50002",variables);
	}

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zhe

Here I directly use the result of the execution of the variables set at startup above,In order to verify here, we mainly focus on the value of the field of the reason for leave,The value before execution is ：

Below we execute the above code：

注意这里使用的id是任务id,不是对象id:

It can be seen that it has been modified.

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