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Flowable中如何使用MySQL視圖

小樊
90
2024-09-13 19:29:41
欄目: 云計算

在Flowable中,你可以通過自定義查詢來使用MySQL視圖。以下是一個簡單的步驟來說明如何在Flowable中使用MySQL視圖:

  1. 首先,創(chuàng)建一個MySQL視圖。假設(shè)我們有一個名為process_instance_with_variables的視圖,它包含了流程實例和相關(guān)變量的信息。
CREATE VIEW process_instance_with_variables AS
SELECT
    pi.id_ AS process_instance_id,
    pi.name_ AS process_instance_name,
    pv.name_ AS variable_name,
    pv.value_ AS variable_value
FROM
    act_ru_execution pi
JOIN
    act_ru_variable pv ON pi.id_ = pv.execution_id_;
  1. 在Flowable的配置文件(例如:flowable.cfg.xml)中,添加一個自定義的查詢。這將允許你在Flowable中使用這個視圖。
<bean id="customQuery" class="org.flowable.engine.impl.cfg.StandaloneProcessEngineConfiguration">
   <property name="customMybatisMappers">
        <list>
           <value>com.example.CustomMybatisMapper</value>
        </list>
    </property>
</bean>
  1. 創(chuàng)建一個自定義的MyBatis映射器接口(例如:CustomMybatisMapper.java),并定義一個方法來查詢視圖。
package com.example;

import java.util.List;
import org.apache.ibatis.annotations.Select;

public interface CustomMybatisMapper {
    @Select("SELECT * FROM process_instance_with_variables WHERE process_instance_id = #{processInstanceId}")
    List<ProcessInstanceWithVariables> getProcessInstanceWithVariables(String processInstanceId);
}
  1. 在Flowable中調(diào)用自定義查詢。你可以通過RuntimeServiceManagementService來調(diào)用這個自定義查詢。
@Autowired
private RuntimeService runtimeService;

public List<ProcessInstanceWithVariables> getProcessInstanceWithVariables(String processInstanceId) {
    CustomMybatisMapper customMybatisMapper = (CustomMybatisMapper) runtimeService.getCommandExecutor()
            .execute(new Command<Object>() {
                @Override
                public Object execute(CommandContext commandContext) {
                    return commandContext.getDbSqlSession().getSqlSession().getMapper(CustomMybatisMapper.class);
                }
            });
    return customMybatisMapper.getProcessInstanceWithVariables(processInstanceId);
}

現(xiàn)在,你已經(jīng)成功地在Flowable中使用了MySQL視圖。你可以根據(jù)需要修改查詢和視圖,以滿足你的業(yè)務(wù)需求。

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