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在Flowable中,你可以通过自定义查询来使用MySQL视图。以下是一个简单的步骤来说明如何在Flowable中使用MySQL视图:
- 首先,创建一个MySQL视图。假设我们有一个名为
process_instance_with_variables
的视图,它包含了流程实例和相关变量的信息。
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_;
- 在Flowable的配置文件(例如:flowable.cfg.xml)中,添加一个自定义的查询。这将允许你在Flowable中使用这个视图。
<bean id="customQuery" class="org.flowable.engine.impl.cfg.StandaloneProcessEngineConfiguration"> <property name="customMybatisMappers"> <list> <value>com.example.CustomMybatisMapper</value> </list> </property> </bean>
- 创建一个自定义的MyBatis映射器接口(例如:CustomMybatisMapper.java),并定义一个方法来查询视图。
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); }
- 在Flowable中调用自定义查询。你可以通过
RuntimeService
或ManagementService
来调用这个自定义查询。
@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); }
现在,你已经成功地在Flowable中使用了MySQL视图。你可以根据需要修改查询和视图,以满足你的业务需求。