擴展activiti原表增加新字段

ctiviti自帶了很多表，如圖：

Activiti工作流引擎的數據庫表中的表名稱都是以 ACT_.第二部分兩個字母表示表的類型。使用模糊匹配的方式說明表的類型匹配activiti的服務API.

·         ACT_RE_*: RE代表倉儲(Repository).這種表前綴以“static”表示流程定義信息或者流程資源信息（如流程的圖表和規則等）.

·         ACT_RU_*: RU標識爲運行(Runtime)時表。包含流程實例，用戶任務和變量任務等在運行時的數據信息。這些表只存儲Activiti在流程實例運行執行的數據，在流程結束的時候從表中去除數據。從而保持運行時候數據的表的快速和小數據量.

·         ACT_ID_*:ID標識爲唯一(Identity)的。包含一些唯一的信息如用戶，用戶做等信息。

·         ACT_HI_*:HI表示歷史數據(History)表，包括過期的流程實例，過期的變量和過期的任務等。

·         ACT_GE_*:GE表示公用(General data)的數據庫表類型。

        ACT_GE_BYTEARRAY 表保存了開發時候的文件，在工作流部署的時候需要上傳相關的工作流文件到相關的項目中。其中如果是文件採用方式如下，將圖片和或者文件轉換爲二進制字節流存儲。

    bytes_字段保存了文件內容，如果是圖片，則是保存了二進制。

    由於各個項目的業務特殊性，想擴展ACT_GE_BYTEARRAY 的字段，增加2個新字段SYS_,SWITCHBOARD_字段。

怎麼把數據保存到表中，這裏採用的是修改源碼的辦法：

步驟1：修改ACT_GE_BYTEARRAY 表對應實體org.activiti.engine.impl.persistence.entity.ResourceEntity，添加SYS_,SWITCHBOARD_字段：

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public class ResourceEntity implements Serializable, PersistentObject {     private static final long serialVersionUID = 1L;     protected String id;   protected String name;   protected byte[] bytes;   protected String deploymentId;   protected boolean generated = false;       //-------------------------------   private String switchboard;   private boolean sys;   ... }

步驟2：修改相應的sql的配置，添加SYS_,SWITCHBOARD_字段。

文件org.activiti.db.mapping.entity.Resource.xml:

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<?xml version="1.0" encoding="UTF-8" ?>   <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">     <mapper namespace="org.activiti.engine.impl.persistence.entity.ResourceEntity">       <!-- RESOURCE INSERT -->     <insert id="insertResource" parameterType="org.activiti.engine.impl.persistence.entity.ResourceEntity">     insert into ${prefix}ACT_GE_BYTEARRAY(ID_, REV_, NAME_, BYTES_, DEPLOYMENT_ID_, GENERATED_,SWITCHBOARD_,SYS_) <span style="font-size:9pt;line-height:1.5;"> values (#{id, jdbc<span></span></span><span style="font-size:9pt;line-height:1.5;">Type=VARCHAR}, 1, #{name, jdbcType=VARCHAR}, #{bytes, jdbcType=BLOB}, #{deploymentId, jdbcType=VARCHAR}, #{generated, jdbcType=BOOLEAN}, #{switchboard, jdbcType=VARCHAR},#{sys, jdbcType=BOOLEAN}) </span> </insert>       <!-- RESOURCE UPDATE -->     <!-- RESOURCE DELETE -->     <delete id="deleteResourcesByDeploymentId" parameterType="string">     delete from ${prefix}ACT_GE_BYTEARRAY where DEPLOYMENT_ID_ = #{id}   </delete>       <!-- RESOURCE RESULTMAP -->     <resultMap id="resourceResultMap" type="org.activiti.engine.impl.persistence.entity.ResourceEntity">     <id property="id" column="ID_" jdbcType="VARCHAR" />     <result property="name" column="NAME_" jdbcType="VARCHAR"/>     <result property="bytes" column="BYTES_" jdbcType="BLOB"/>     <result property="generated" column="GENERATED_" jdbcType="BOOLEAN"/>     <result property="switchboard" column="SWITCHBOARD_" jdbcType="VARCHAR"/>     <result property="sys" column="SYS_" jdbcType="BOOLEAN"/>   </resultMap>       <!-- RESOURCE SELECT -->     <select id="selectResourceNamesByDeploymentId" parameterType="org.activiti.engine.impl.db.ListQueryParameterObject" resultType="string">     select NAME_ from ${prefix}ACT_GE_BYTEARRAY where DEPLOYMENT_ID_ = #{parameter} order by NAME_ asc   </select>       <select id="selectResourceByDeploymentIdAndResourceName" parameterType="map" resultMap="resourceResultMap">     select * from ${prefix}ACT_GE_BYTEARRAY     where DEPLOYMENT_ID_ = #{deploymentId}           AND NAME_ = #{resourceName}   </select>     <select id="selectResourcesByDeploymentId" parameterType="org.activiti.engine.impl.db.ListQueryParameterObject" resultMap="resourceResultMap">     select * from ${prefix}ACT_GE_BYTEARRAY where DEPLOYMENT_ID_ = #{parameter} order by NAME_ asc   </select>      <!-- postgresql specific -->   <resultMap id="resourceResultMap_postgres" type="org.activiti.engine.impl.persistence.entity.ResourceEntity">     <id property="id" column="ID_" jdbcType="VARCHAR" />     <result property="name" column="NAME_" jdbcType="VARCHAR"/>     <result property="bytes" column="BYTES_" jdbcType="BINARY"/>     <result property="generated" column="GENERATED_" jdbcType="BOOLEAN"/>     <result property="switchboard" column="SWITCHBOARD_" jdbcType="VARCHAR"/>     <result property="sys" column="SYS_" jdbcType="BOOLEAN"/>   </resultMap>         <!-- postgresql specific -->   <select id="selectResourceByDeploymentIdAndResourceName_postgres" parameterType="map" resultMap="resourceResultMap_postgres">     select * from ${prefix}ACT_GE_BYTEARRAY     where DEPLOYMENT_ID_ = #{deploymentId}           AND NAME_ = #{resourceName}   </select>       <!-- postgresql specific -->   <select id="selectResourcesByDeploymentId_postgres" parameterType="org.activiti.engine.impl.db.ListQueryParameterObject" resultMap="resourceResultMap_postgres">     select * from ${prefix}ACT_GE_BYTEARRAY where DEPLOYMENT_ID_ = #{parameter} order by NAME_ asc   </select>      </mapper>

主要就是修改<insert><resultMap>的內容

步驟3：加載數據文件時候，設置SYS_,SWITCHBOARD_的值

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ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();  RepositoryService repositoryService = processEngine.getRepositoryService();  DeploymentBuilderImpl deploymentBuilder =(DeploymentBuilderImpl) repositoryService.createDeployment()  .addClasspathResource("activiti/leave.bpmn");  DeploymentEntity deploymentEntity = deploymentBuilder.getDeployment();  ResourceEntity resourceEntity = deploymentEntity.getResource("activiti/leave.bpmn");  resourceEntity.setSwitchboard(getSwitchboard());  resourceEntity.setSys(true);  deploymentEntity.addResource(resourceEntity);  deploymentBuilder.deploy();

注：這裏主要是通過ResourceEntity resourceEntity = deploymentEntity.getResource("activiti/leave.bpmn");獲得數據庫獲得對應的實體，然後設置我們新添加的字段的值。 

測試結果：

看到上面的數據，SYS_,SWITCHBOARD_字段都有值了，activiti/leave.bpmn是正確的，但是activiti/leave.leave.png對應的值是不正確的。因爲這2個添加的值因該是一樣的。

下面繼續修改：

步驟4：org.activiti.engine.impl.bpmn.deployer.BpmnDeployer,加載activiti/leave.bpmn中的圖片

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public void deploy(DeploymentEntity deployment) { ...   createResource(resourceName,diagramResourceName, diagramBytes, deployment); ... }   protected void createResource(String resourceName ,String name, byte[] bytes, DeploymentEntity deploymentEntity) {     ResourceEntity resource = new ResourceEntity();     resource.setName(name);     resource.setBytes(bytes);     resource.setDeploymentId(deploymentEntity.getId());           ResourceEntity resourceEntity = deploymentEntity.getResource(resourceName);     if(resourceEntity!=null){         resource.setSwitchboard(resourceEntity.getSwitchboard());         resource.setSys(resourceEntity.isSys());     }     // Mark the resource as 'generated'     resource.setGenerated(true);           Context       .getCommandContext()       .getDbSqlSession()       .insert(resource);   }

有人要問，問什麼要這麼修改，沒辦法，我是一步一步debug，一步一步看源碼。

步驟5：文件org.activiti.db.mapping.entity.VariableInstance.xml，添加SYS_,SWITCHBOARD_字段：

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<!-- BYTE ARRAY INSERT -->   <insert id="insertByteArray" parameterType="org.activiti.engine.impl.persistence.entity.ByteArrayEntity">   insert into ${prefix}ACT_GE_BYTEARRAY(ID_, REV_, NAME_, BYTES_, DEPLOYMENT_ID_,SWITCHBOARD_,SYS_)   values (     #{id, jdbcType=VARCHAR},     1,     #{name, jdbcType=VARCHAR},     #{bytes, jdbcType=BLOB},     #{deploymentId, jdbcType=VARCHAR},     #{switchboard, jdbcType=VARCHAR},     #{sys, jdbcType=BOOLEAN}   )  </insert>

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然後測試結果：