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Oracle 树操作(select…start with…connect by…prior)

2017-07-23 11:41 344 查看

Oracle树操作(select…startwith…connectby…prior)

oracle树查询的最重要的就是select…startwith…connectby…prior语法了。依托于该语法，我们可以将一个表形结构的以树的顺序列出来。在下面列述了oracle中树型查询的常用查询方式以及经常使用的与树查询相关的oracle特性函数等，在这里只涉及到一张表中的树查询方式而不涉及多表中的关联等。1、准备测试表和测试数据13579111315171921232527293133353739414345474951535557596163

table

not

--标题

parentnumber(10)

--父菜单insert

tb_menu(id,title,parent)

(1,

);

insert

tb_menu(id,title,parent)

(2,

);

insert

tb_menu(id,title,parent)

(3,

);

insert

tb_menu(id,title,parent)

(4,

);

insert

tb_menu(id,title,parent)

(5,

);

--一级菜单insert

tb_menu(id,title,parent)

(6,

,1);

insert

tb_menu(id,title,parent)

(7,

,1);

insert

tb_menu(id,title,parent)

(8,

,1);

insert

tb_menu(id,title,parent)

(9,

,2);

insert

tb_menu(id,title,parent)

(10,

,2);

insert

tb_menu(id,title,parent)

(11,

,2);

insert

tb_menu(id,title,parent)

(12,

,3);

insert

tb_menu(id,title,parent)

(13,

,3);

insert

tb_menu(id,title,parent)

(14,

,3);

insert

tb_menu(id,title,parent)

(15,

,4);

insert

tb_menu(id,title,parent)

(16,

,4);

insert

tb_menu(id,title,parent)

(17,

,4);

insert

tb_menu(id,title,parent)

(18,

,5);

insert

tb_menu(id,title,parent)

(19,

,5);

insert

tb_menu(id,title,parent)

(20,

,5);

--二级菜单insert

tb_menu(id,title,parent)

(21,

,6);

insert

tb_menu(id,title,parent)

(22,

,6);

insert

tb_menu(id,title,parent)

(23,

,7);

insert

tb_menu(id,title,parent)

(24,

,7);

insert

tb_menu(id,title,parent)

(25,

,8);

insert

tb_menu(id,title,parent)

(26,

,9);

insert

tb_menu(id,title,parent)

(27,

,10);

insert

tb_menu(id,title,parent)

(28,

,11);

insert

tb_menu(id,title,parent)

(29,

,12);

insert

tb_menu(id,title,parent)

(30,

,13);

insert

tb_menu(id,title,parent)

(31,

,14);

insert

tb_menu(id,title,parent)

(32,

,15);

insert

tb_menu(id,title,parent)

(33,

,16);

insert

tb_menu(id,title,parent)

(34,

,17);

insert

tb_menu(id,title,parent)

(35,

,18);

insert

tb_menu(id,title,parent)

(36,

,19);

insert

tb_menu(id,title,parent)

(37,

,20);

--三级菜单insert

tb_menu(id,title,parent)

(38,

,21);

insert

tb_menu(id,title,parent)

(39,

,22);

insert

tb_menu(id,title,parent)

(40,

,23);

insert

tb_menu(id,title,parent)

(41,

,24);

insert

tb_menu(id,title,parent)

(42,

,25);

insert

tb_menu(id,title,parent)

(43,

,26);

insert

tb_menu(id,title,parent)

(44,

,27);

insert

tb_menu(id,title,parent)

(45,

,28);

insert

tb_menu(id,title,parent)

(46,

,28);

insert

tb_menu(id,title,parent)

(47,

,29);

insert

tb_menu(id,title,parent)

(48,

,30);

insert

tb_menu(id,title,parent)

(49,

,31);

insert

tb_menu(id,title,parent)

(50,

,31);

commit

select

from

null

--c-->child,p->parentselectc.id,c.title,p.idparent_id,p.titleparent_titlefromtb_menuc,tb_menupwherec.parent=p.idandc.id=

2468

withtmpas(

fromtb_menua

null

246810121416182022

selecttb_menu.*,levellev

startwithparentis

connectbyparent=priorid)

selectb.*fromtmpb,(select*

whereid=

andlev=

)
a

whereb.lev=

unionall

fromtmpx,--祖父

(select*

whereid=

andlev>

)z--儿子

2468

withtmpas(

fromtb_menua

null

'/'

startwithparentis

selectsys_connect_by_path(title,

fromtb_menustartwithid=

selectconnect_by_roottitle,tb_menu.*fromtb_menustartwithid=

selectconnect_by_isleaf,tb_menu.*fromtb_menustartwithparentis

<codestyle='background:none!important;margin:0px!important;padding:0px!important;outline:0px!important;border-radius:0px!important;border:0pxcurrentColor!important;border-image:none!important;left:auto!important;top:auto!important;width:auto!important;height:auto!important;right:auto!important;bottom:auto!important;color:rgb(0,0,0)!important;line-height:1.8em!important;overflow:visible!important;font-family:Consolas,"BitstreamVeraSansMono","CourierNew",Courier,monospace!important;vertical-align:baseline!important;float:none!important;white-space:pre-wrap;position:static!important;min-height:auto!important;box-sizing:content-box!important;'plain"="">connectbyparent=priorid;

connect_by_isleaf函数用来判断当前节点是否包含下级节点，如果包含的话，说明不是叶子节点，这里返回0；反之，如果不包含下级节点，这里返回1。至此，oracle树型查询基本上讲完了，以上的例子中的数据是使用到做过的项目中的数据，因为里面的内容可能不好理解，所以就全部用一些新的例子来进行阐述。以上所有sql都在本机上测试通过，也都能实现相应的功能，但是并不能保证是解决这类问题的最优方案（如第8条明显写成存储过程会更好）.转载自：http://www.cnblogs.com/walk-the-Line/p/4882866.html感谢学无止境

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