Flowable工作流之查询历史流程信息

1. 前言

上篇文章 和大家分享的流程操作主要是正在执行的流程，我们有一个非常常见的场景是查询执行过的流程信息，在上篇文章中，小伙伴们已经知道，对于正在执行的流程，会在 act_ru_execution 表中保存一条对应的记录，不过流程执行结束之后，act_ru_execution 表中的记录会被删除掉，此时要是想查询已经执行过的流程信息，去哪里查询呢？今天我们就来看看 HistoryService 的使用

本文使用的流程图依然是上篇文章中使用过的，如下

<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:flowable="http://flowable.org/bpmn"
             xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"
             xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI"
             typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath"
             targetNamespace="http://www.flowable.org/processdef" exporter="Flowable Open Source Modeler"
             exporterVersion="6.7.2">
    <process id="MyLeave" name="MyLeave" isExecutable="true">
        <documentation>员工请假流程documentation>
        <startEvent id="sid-159DD77D-9878-4288-AC29-B898E08DC216" flowable:formFieldValidation="true">startEvent>
        <userTask id="zgID" name="主管审批" flowable:assignee="张主管" flowable:formFieldValidation="true">
            <extensionElements>
                <modeler:initiator-can-complete xmlns:modeler="http://flowable.org/modeler">
                    modeler:initiator-can-complete>
            extensionElements>
        userTask>
        <sequenceFlow id="sid-1E8F84D7-6C11-4D88-84C9-B818474F880E" sourceRef="sid-159DD77D-9878-4288-AC29-B898E08DC216"
                      targetRef="zgID">sequenceFlow>
        <exclusiveGateway id="sid-A6E285DA-5C65-4BA7-8BB4-5F4D97AC12E0">exclusiveGateway>
        <sequenceFlow id="sid-08020782-2DDE-4C56-BFC0-224DC99FB50E" sourceRef="zgID"
                      targetRef="sid-A6E285DA-5C65-4BA7-8BB4-5F4D97AC12E0">sequenceFlow>
        <endEvent id="sid-5BFB0FC6-B2A5-4F6E-9BDB-8785F2883AEB">endEvent>
        <userTask id="jlID" name="经理审批" flowable:assignee="李经理" flowable:formFieldValidation="true">
            <extensionElements>
                <modeler:initiator-can-complete xmlns:modeler="http://flowable.org/modeler">
                    modeler:initiator-can-complete>
            extensionElements>
        userTask>
        <exclusiveGateway id="sid-0DA07C30-2930-40F5-A887-FA1C5BF307EF">exclusiveGateway>
        <sequenceFlow id="sid-833DAA1C-F1C2-41A1-8455-3FAB79893C14" sourceRef="jlID"
                      targetRef="sid-0DA07C30-2930-40F5-A887-FA1C5BF307EF">sequenceFlow>
        <endEvent id="sid-8941849E-B17F-4848-BFC8-C6B05CC21A9F">endEvent>
        <endEvent id="sid-3596170A-0E0F-4C07-BD32-F04AFB375EB1">endEvent>
        <sequenceFlow id="sid-A74937CE-02B1-493B-8033-08CA2D652771" name="同意"
                      sourceRef="sid-A6E285DA-5C65-4BA7-8BB4-5F4D97AC12E0" targetRef="jlID">
            <conditionExpression xsi:type="tFormalExpression">conditionExpression>
        sequenceFlow>
        <sequenceFlow id="sid-BE2005E1-26F7-4E42-8AC2-7C4F25274F1A" name="同意"
                      sourceRef="sid-0DA07C30-2930-40F5-A887-FA1C5BF307EF"
                      targetRef="sid-3596170A-0E0F-4C07-BD32-F04AFB375EB1">
            <conditionExpression xsi:type="tFormalExpression">conditionExpression>
        sequenceFlow>
        <sequenceFlow id="sid-67F146AA-C9F5-4A21-AF26-A77A349D80B7" name="拒绝"
                      sourceRef="sid-A6E285DA-5C65-4BA7-8BB4-5F4D97AC12E0"
             
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