一个ref cursor的使用例子

create or replace
procedure prod_fixing_datacb IS
    
    type cur_userId is ref cursor; -- 游动浮标定义

    c_msgUserIds    cur_userId;
    c_actionUserIds cur_userId;
    c_msgUids       cur_userId;
    c_todoUserIds   cur_userId;
    
    mysql           varchar2(4000);    
    n_msgUserId     number:=0; -- 承办用户wf_msg.nUserId
    n_actionUserId  number:=0; -- 承办用户wf_proc_action.nUserId
    n_msgUid        number:=0; -- 来文登记用户wf_msg.nUserId
    v_todoUserIds   varchar2(2000);
    
    n_userId        number:=0; -- 获取的承办用户结果
    n_nDocId        number:=0;
    n_nFlowId       number:=0;

    CURSOR c_fixing_docIds IS
	-- 修复收文中批示，拟办节点缺少续办对象的数据
        select 
            gwe.nDocId, gwe.nFlowId
        from 
            wf_doc_gw gw, wf_doc_gw_entity gwe
        where gw.ndocId = gwe.ndocId
            and gw.ndocsortId = 1
            and gw.nstate=0
            and gw.cProcUserList is null
            and gw.nProcId in (66,10)
        order by gw.nDocId;

begin
   open c_fixing_docIds;  
   Loop   
     Fetch c_fixing_docIds into 
        n_nDocId,n_nFlowId;
        
        if (n_nFlowId>0) then
          -- 获得承办用户USERID
          mysql := 'select msgUserId from ('||
            'select nMsgId, nUserId as msgUserId,currentProcId,'||
            'row_number() over(partition by currentProcId order by dwrite desc) rowNumberId '||
            'from wf_msg '||
            'where currentProcId = 64 and ndocid='||n_nDocId||') a where rowNumberId=1';
          
          open c_msgUserIds for mysql;  
          loop  
            fetch c_msgUserIds into n_msgUserId;
            exit when c_msgUserIds%notfound;  
            
            if(n_msgUserId>0) then
                n_userId := n_msgUserId;
            end if;
          end loop; 
          close c_msgUserIds;
          
          if (n_userId=0) then
            mysql := 'select actionUserId from '||
								'(select nUserId as actionUserId, '||
								'row_number() over(partition by nFlowId order by dRecvDate desc) rowNumberId '||
								'from wf_proc_action '||
								'where nProcId = 64 and '||
								'ndocid='||n_nDocId||') a where rowNumberId=1";';
          
            open c_actionUserIds for mysql;  
            loop  
              fetch c_actionUserIds into n_actionUserId;
              exit when c_actionUserIds%notfound;  
              if(n_actionUserId>0) then
                  n_userId := n_actionUserId;
              end if;
            end loop; 
            close c_actionUserIds;
          end if;
          
          if (n_userId=0) then
            mysql := 'select msgUserId from ('||
            'select nMsgId, nUserId as msgUserId,currentProcId,'||
            'row_number() over(partition by currentProcId order by dwrite desc) rowNumberId '||
            'from wf_msg '||
            'where currentProcId = 20 and ndocid='||n_nDocId||') a where rowNumberId=1';
          
            open c_msgUids for mysql;  
            loop  
              fetch c_msgUids into n_msgUid;
              exit when c_msgUids%notfound;  
              if(n_msgUid>0) then
                  n_userId := n_msgUid;
              end if;
            end loop; 
            close c_msgUids;
          end if;
          Dbms_Output.put_line('n_userId:'||n_userId);  
            
          mysql:='update dispatch_entitylog '||
                'set sendstatus=1, receiveuserid='||n_userId||','||
								'receivedate=sysdate,receivestatus=1,'||
								'receiveusername=(select u.realname from tbuser u where u.userid='||n_userId||'),'||
								'receiveentityname=(select e1.entityname from tbuser u, tbentity e1 where u.currententityid=e1.entityid and u.userid='||n_userId||'),'||
								'receiveorgname=(select e2.entityname from tbuser u, tbentity e1, tbentity e2 where u.currententityid=e1.entityid and e1.belongedentityid = e2.entityid and u.userid = '||n_userId||') '||
								'where nFlowId='||n_nFlowId||' and receivedate is null and nProcId = 64'; -- 承办部门修改，其它暂时不修改
					execute immediate mysql;
          Dbms_Output.put_line(mysql);  
            
          mysql:='insert into wf_proc_flow (nFlowId,nDocId, nProcId, nDocsortId, '||
                  'dRecvDate,dFnshDate, nFinishStatus,nOrder, nAndOr)'||
								'select '||n_nFlowId||', '||n_nDocId||', 64, 1, sysdate,sysdate,1, 0,0 from dual where not exists '||
								'(select nFlowId from wf_proc_flow where nDocId='||n_nDocId||' '||
								'and nProcId=64 and nFlowId='||n_nFlowId||')';
          execute immediate mysql;                
          Dbms_Output.put_line(mysql);  
          
					mysql := 'update wf_proc_flow set cUserList='||to_char(n_userId)||' '||
								'where nFlowId = '||n_nFlowId||' and nDocId='||n_nDocId||' '||  
								'and cUserList is null';
					execute immediate mysql;                
          Dbms_Output.put_line(mysql);  
										
					mysql := 'update wf_proc_flow set dFnshDate=sysdate, nFinishStatus=1 '||
                  'where nFlowId ='||n_nFlowId||' and nDocId='||n_nDocId||' '||  
                  'and dFnshDate is null';
					execute immediate mysql;                
          Dbms_Output.put_line(mysql);  
						
					mysql := 'insert into wf_proc_action (nDocId, nUserId, nDocsortId, nProcId,dRecvDate,dFnshDate, nFinishStatus,nOrder, nAndOr, nFlowId) '||
								'select '||n_nDocId||','||n_userId||',1,64,sysdate,sysdate,1,0,0,'||n_nFlowId||' '||
								'from dual where not exists '||
								'(select nFlowId from wf_proc_action where nDocId='||n_nDocId||' and nProcId=64 and nFlowId='||n_nFlowId||')';
					execute immediate mysql;                
          Dbms_Output.put_line(mysql);  
						
					mysql:= 'update wf_proc_action set nUserId='||n_userId||' '||  
								'where nFlowId ='||n_nFlowId||' and nDocId='||n_nDocId||' and nUserId is null';
					execute immediate mysql;                
          Dbms_Output.put_line(mysql);  
										
					mysql := 'update wf_proc_action set dFnshDate=sysdate, nFinishStatus=1 '||
                'where nFlowId = '||n_nFlowId||' and nDocId='||n_nDocId||' and dFnshDate is null';
					execute immediate mysql;                
          Dbms_Output.put_line(mysql);  
					
					mysql := 'delete from wf_doc_gw_entity where nFlowid='||n_nFlowId;
					execute immediate mySql;                
          Dbms_Output.put_line(mysql);  
          
          mysql := 'select wmsys.wm_concat(d.nUserId) from (select wpa.nFlowId, wpa.nUserId,'||
              'row_number() over (partition by wpa.nDocId order by wpa.nFlowId) rowNumId,'||
              'row_number() over (partition by wpa.nFlowId order by wpa.nOrder desc) rowNumberId '||
              'from wf_proc_action wpa, wf_doc_gw gw '||
              'where wpa.ndocid = gw.nDocId '||
              'and wpa.nProcId = gw.nProcId '||
              'and wpa.dfnshdate is null '||
              'and gw.nDocId = '||n_nDocId||') d where d.rowNumberId=1 and d.rowNumId=1';
          Dbms_Output.put_line(mysql);  
          
          open c_todoUserIds for mysql;  
          loop  
              fetch c_todoUserIds into v_todoUserIds;
              exit when c_todoUserIds%notfound;  
              Dbms_Output.put_line('v_todoUserIds:'||v_todoUserIds);  
          end loop; 
          close c_todoUserIds;
          
          if(v_todoUserIds is null) then
            mysql:='update wf_doc_gw set cProcUserList='||n_userId||', nProcStatus=1 where nDocId='||n_nDocId;
          else
            mysql:='update wf_doc_gw set cProcUserList='||v_todoUserIds||',nProcStatus=0 where nDocId='||n_nDocId;
          end if;
          execute immediate mySql;                
          Dbms_Output.put_line(mysql);  

        end if;
     Exit when c_fixing_docIds%notfound;  
           
   end loop;  
   commit;
   
   Exception   
     when others then  
         close c_fixing_docIds;  
         rollback;
         Dbms_Output.put_line(Sqlerrm);  
           
   if c_fixing_docIds%isopen then     
      close c_fixing_docIds;  
   end if;  
end prod_fixing_datacb;