背景
在构建项目jeecgflow过程中，出现了启动异常。我们这边用的是JeecgBoot3.6.2集成flowable6.7.2。大家可以参考之前的文章，有讲解jeecgboot如何集成flowable
在集成之后，确实可以正常启动， 然后我们就开始了模型建模了。
然后再次启动项目，就出现了如下的报错信息了。
//部分报错信息摘抄如下。
Caused by: liquibase.exception.DatabaseException:
Table 'act_dmn_deployment' already exists
Caused by: org.flowable.common.engine.api.FlowableException:
Error updating dmn engine tables
Caused by: org.flowable.common.engine.api.FlowableException:
Error initialising dmn data model
Invocation of init method failed; nested exception is
org.flywaydb.core.internal.command.DbMigrate$FlywayMigrateException:
Migration V3.6.2__all_upgrade.sql failed
SQL State : 42S21
Error Code : 1060
Message : Duplicate column name 'visits_num'
Location : flyway/sql/mysql/V3.6.2__all_upgrade.sql
Error creating bean with name 'flywayInitializer' defined in class path resource
[org/springframework/boot/autoconfigure/flyway/FlywayAutoConfiguration$FlywayConfiguration.class]: Invocation of init method failed; nested exception is
org.flywaydb.core.api.exception.FlywayValidateException: Validate failed: Migrations have failed validation
Detected failed migration to version 3.6.2 (all upgrade).
Please remove any half-completed changes then run repair to fix the schema history.
删除表中记录的有错误的sql并重新跑, 将flyway_schema_history中的数据进行清除。
Caused by: org.flywaydb.core.internal.command.DbMigrate$FlywayMigrateException:
Migration V3.6.2__all_upgrade.sql failed
Caused by: java.sql.SQLSyntaxErrorException: Duplicate column name 'visits_num'
