在使用activiti 的时候会经常遇到需要清空数据库中的数据，因此本文重点讲解如何解决该问题。

再删除数据的时候，需要注意有主外键约束的问题？下面罗列的DDL可以结合自身的业务需求进行灵活改造。

DELETE  FROM  `act_hi_attachment`;

DELETE  FROM  `act_hi_comment`;

DELETE  FROM  `act_hi_detail`;

DELETE  FROM  `act_hi_actinst`;

DELETE  FROM  `act_hi_identitylink`;

DELETE  FROM  `act_hi_procinst`;

DELETE  FROM  `act_hi_taskinst`;

DELETE  FROM  `act_hi_varinst`;

DELETE  FROM  `act_ru_identitylink`;

DELETE  FROM  `act_ru_task`;

DELETE  FROM  `act_ru_variable`;

DELETE  FROM  `act_ru_execution` WHERE `PARENT_ID_` IS NOT NULL AND `IS_SCOPE_`=0;

DELETE  FROM  `act_ru_execution` WHERE `PARENT_ID_` IS NOT NULL AND `IS_SCOPE_`=1;

DELETE  FROM  `act_ru_execution`;