扩展activiti原表增加新字段

ctiviti自带了很多表，如图：

Activiti工作流引擎的数据库表中的表名称都是以 ACT_.第二部分两个字母表示表的类型。使用模糊匹配的方式说明表的类型匹配activiti的服务API.

·         ACT_RE_*: RE代表仓储(Repository).这种表前缀以“static”表示流程定义信息或者流程资源信息（如流程的图表和规则等）.

·         ACT_RU_*: RU标识为运行(Runtime)时表。包含流程实例，用户任务和变量任务等在运行时的数据信息。这些表只存储Activiti在流程实例运行执行的数据，在流程结束的时候从表中去除数据。从而保持运行时候数据的表的快速和小数据量.

·         ACT_ID_*:ID标识为唯一(Identity)的。包含一些唯一的信息如用户，用户做等信息。

·         ACT_HI_*:HI表示历史数据(History)表，包括过期的流程实例，过期的变量和过期的任务等。

·         ACT_GE_*:GE表示公用(General data)的数据库表类型。

        ACT_GE_BYTEARRAY 表保存了开发时候的文件，在工作流部署的时候需要上传相关的工作流文件到相关的项目中。其中如果是文件采用方式如下，将图片和或者文件转换为二进制字节流存储。

    bytes_字段保存了文件内容，如果是图片，则是保存了二进制。

    由于各个项目的业务特殊性，想扩展ACT_GE_BYTEARRAY 的字段，增加2个新字段SYS_,SWITCHBOARD_字段。

怎么把数据保存到表中，这里采用的是修改源码的办法：

步骤1：修改ACT_GE_BYTEARRAY 表对应实体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;   ... }

步骤2：修改相应的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>的内容

步骤3：加载数据文件时候，设置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：这里主要是通过ResourceEntity resourceEntity = deploymentEntity.getResource("activiti/leave.bpmn");获得数据库获得对应的实体，然后设置我们新添加的字段的值。 

测试结果：

看到上面的数据，SYS_,SWITCHBOARD_字段都有值了，activiti/leave.bpmn是正确的，但是activiti/leave.leave.png对应的值是不正确的。因为这2个添加的值因该是一样的。

下面继续修改：

步骤4：org.activiti.engine.impl.bpmn.deployer.BpmnDeployer,加载activiti/leave.bpmn中的图片

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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);   }

有人要问，问什么要这么修改，没办法，我是一步一步debug，一步一步看源码。

步骤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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然后测试结果：