oracle 函数中游标及递归的应用 博客分类： 编程相关SQL数据库 oracle函数递归游标

  在代码中使用递归可能大部分程序员都不陌生，但是在存储过程或者函数中写个递归估计就不多见了。
 
  今天遇到了一个在oracle函数中使用递归的例子，特记录下来，方便以后查阅

CREATE OR REPLACE FUNCTION F_Func(v_pcatalogue IN NUMBER, i_newPcatalogue IN NUMBER, v_authTypeId in number)
  RETURN NUMBER
  as
  v_newCatalogueId number(10);
  v_oldCatalogueId number(10);
  v_newPcatalogue number(10);
  v_count number(10);
  v_value number(10);
  --根据目录表父节点ID查询目录表数据的游标
  Cursor cusor_1(v_pcatalogue number) is 
         select id, cname, ename, cdescription, edescription, authtype, pcatalogue, orderb, createtime, userid, creater, updatetime, updateuserid, updator, state from t_catalogue
         where authtype=v_authTypeId and pcatalogue=v_pcatalogue;

BEGIN
  --记录下旧的父节点ID
  v_oldCatalogueId := v_pcatalogue;
  --记录下新的父节点ID
  v_newPcatalogue := i_newPcatalogue;
  select count(1) into v_count from t_catalogue where authtype=v_authTypeId and pcatalogue=v_pcatalogue;
  if v_count = 0 then
    return 1;
  else
    for c2 in cusor_1(v_oldCatalogueId) loop
	--生成新的id及拷贝工作
      v_oldCatalogueId := c2.id;
      select HIBERNATE_SEQUENCE.NEXTVAL into v_newCatalogueId from dual;
      if v_newPcatalogue is null then
        select HIBERNATE_SEQUENCE.NEXTVAL into v_newPcatalogue from dual;
      end if;
      insert into t_catalogue_20140619(id, cname, ename, cdescription, edescription, authtype, pcatalogue, orderb, createtime, userid, creater, updatetime, updateuserid, updator, state)
             values(v_newCatalogueId, c2.cname, c2.ename, c2.cdescription, c2.edescription, c2.authtype, v_newPcatalogue, c2.orderb, c2.createtime, c2.userid, c2.creater, c2.updatetime, c2.updateuserid, c2.updator, c2.state);
      commit;
      --不用变量接值，编译过不了
      v_value := F_Func(v_oldCatalogueId, v_newCatalogueId, v_authTypeId);
    end loop;
    --这个返回很重要
    return 1;
  end if;

END F_Func;
/