JPA DB2-删除表后获取SQLCODE“ -204”，SQLSTATE“ 42704”和SQLCODE = -727，SQLSTATE = 56098

Question

在我们的一张桌子掉下来之后，我遇到了一个烦人的问题。

我试图持久化一个实体，但是每次我在其上调用persist（...）时，都会收到以下错误消息：

引起原因：com.ibm.db2.jcc.am.SqlException：隐式操作“ 3”期间发生错误。 SQLCODE“ -204”，SQLSTATE“ 42704”和消息“ MYDB2SCHEMA.TB_ABCD”中的令牌。.SQLCODE = -727，SQLSTATE = 56098，DRIVER = 4.12.56

看起来找不到“ MYDB2SCHEMA.TB_ABCD”，当然，因为DBA上周删除了它，所以找不到。 但这很奇怪，因为我要保留的实体与“ MYDB2SCHEMA.TB_ABCD”实体没有关系，我们称之为ABCDEntity。

为了使事情变得更加复杂，我删除了ABCDEntity，以使不再有与其相关的实体，然后在整个项目中搜索“ MYDB2SCHEMA.TB_ABCD”，也没有找到任何东西，但是仍然出现相同的错误。

我试图保留在DB2中的表与死表没有关系，我不是DBA，但我相信如果死表具有任何关系，它将在删除期间删除。

那么，如果不再有与之相关的实体/表，为什么DB2或JPA仍在尝试寻找该表？

Answer 1

数据库中必须有其他引用删除表的对象，例如触发器或视图。 当引用该对象时，DB2尝试重新验证该对象。 如果您跟踪由持久性框架生成的确切SQL语句，可能会更好地了解情况。

如果由于某种原因您不能要求您的DB2查找有问题的对象，则可以尝试使用该查询来查找还有哪些其他对象仍依赖于丢失的表：

with t(s,n) as (values ('YOURSCHEMA','YOURTABLE'))
select 'control'    as object_type, 
       dschema      as schema, 
       dname        as name, 
       case dtype when 'y' then 'row permission' when '2' then 'column mask' else 'unknown' end as depend_type
from syscat.controldep join t on btype = 'T' and (bschema,bname) = (s,n)
union all
select 'datatype'   as object_type, 
       typeschema   as schema, 
       typename     as name, 
       case when typemodulename is not null then 'in module '|| typemodulename else '' end as depend_type
from syscat.datatypedep join t on btype = 'T' and (bschema,bname) = (s,n)
union all
select 'index'      as object_type, 
       indschema    as schema, 
       indname      as name, 
       ''           as depend_type
from syscat.indexdep join t on btype = 'T' and (bschema,bname) = (s,n)
union all
select 'package'    as object_type, 
       pkgschema    as schema, 
       pkgname      as name, 
       ''           as depend_type
from syscat.packagedep join t on btype = 'T' and (bschema,bname) = (s,n)
union all
select 'routine'    as object_type, 
       routineschema    as schema, 
       specificname     as name, 
       case when routinemodulename is not null then 'in module '|| routinemodulename else '' end as depend_type
from syscat.routinedep join t on btype = 'T' and (bschema,bname) = (s,n)
union all
select 'table-ish'  as object_type, 
       tabschema    as schema, 
       tabname      as name, 
       case dtype when 'S' then 'MQT'
                  when 'T' then 'staging table'
                  when 'V' then 'view'
                  when '7' then 'synopsis table'
                  else dtype end as depend_type
from syscat.tabdep join t on btype = 'T' and (bschema,bname) = (s,n)
union all
select 'trigger'    as object_type, 
       trigschema   as schema, 
       trigname     as name, 
       ''           as depend_type
from syscat.trigdep join t on btype = 'T' and (bschema,bname) = (s,n)
union all
select 'global var'     as object_type, 
       varschema        as schema, 
       varname          as name, 
       case when varmodulename is not null then 'in module '|| varmodulename else '' end as depend_type
from syscat.variabledep join t on btype = 'T' and (bschema,bname) = (s,n)