[转]Oracle查询树形数据的叶节点和子节点

oracle 9i判断是叶子或根节点，是比较麻烦的一件事情，SQL演示脚本如下:

--表结构--

DROP TABLE idb_hierarchical;

create TABLE idb_hierarchical

(

id number,

parent_id number,

str varchar2(10)

);

--测试数据--

insert into idb_hierarchical values(1,null,'A');

insert into idb_hierarchical values(2,1,'B');

insert into idb_hierarchical values(3,2,'C');

insert into idb_hierarchical values(4,3,'D');

insert into idb_hierarchical values(5,2,'E');

insert into idb_hierarchical values(6,2,'F');

insert into idb_hierarchical values(7,3,'G');

insert into idb_hierarchical values(8,4,'H');

insert into idb_hierarchical values(9,4,'I');

insert into idb_hierarchical values(10,null,'J');

insert into idb_hierarchical values(11,10,'K');

insert into idb_hierarchical values(12,11,'L');

insert into idb_hierarchical values(13,10,'M');

[sql] view plaincopy

DROP TABLE idb_hierarchical;

create TABLE idb_hierarchical

(

id number,

parent_id number,

str varchar2(10)

);  

insert into idb_hierarchical values(1,null,'A');

insert into idb_hierarchical values(2,1,'B');

insert into idb_hierarchical values(3,2,'C');

insert into idb_hierarchical values(4,3,'D');

insert into idb_hierarchical values(5,2,'E');

insert into idb_hierarchical values(6,2,'F');

insert into idb_hierarchical values(7,3,'G');

insert into idb_hierarchical values(8,4,'H');

insert into idb_hierarchical values(9,4,'I');

insert into idb_hierarchical values(10,null,'J');

insert into idb_hierarchical values(11,10,'K');

insert into idb_hierarchical values(12,11,'L');

insert into idb_hierarchical values(13,10,'M');

示例数据清单如下:

view plaincopy to clipboardprint?

SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,
        ID,PARENT_ID,LEVEL LVL

         FROM idb_hierarchical

          START WITH PARENT_ID IS NULL

           CONNECT BY PARENT_ID = PRIOR ID;

SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,
        ID,PARENT_ID,LEVEL LVL

         FROM idb_hierarchical

          START WITH PARENT_ID IS NULL

           CONNECT BY PARENT_ID = PRIOR ID;

表1:数据清单

STR_LEVEL    ID    PARENT_ID    LVL

+..A    1         1

+….B    2    1    2

+……C    3    2    3

+……..D    4    3    4

+……….H    8    4    5

+……….I    9    4    5

+……..G    7    3    4

+……E    5    2    3

+……F    6    2    3

+..J    10         1

+….K    11    10    2

+……L    12    11    3

+….M    13    10    2

在表1中，ID为8、9、 7、5、6、12、13都没有子节点，因此称为叶节点。

1.oracle9i 查询叶节点

只显示叶子节点SQL

view plaincopy to clipboardprint?

SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL

  FROM idb_hierarchical I

  --在oracle 9i中显示叶节点，需要判断是否有子节点即可

  WHERE NOT EXISTS(SELECT 1

  FROM idb_hierarchical B

  WHERE I.ID=B.PARENT_ID)

 START WITH PARENT_ID IS NULL

CONNECT BY PARENT_ID = PRIOR ID;

[sql] view plaincopy

SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL

  FROM idb_hierarchical I

  --在oracle 9i中显示叶节点，需要判断是否有子节点即可

  WHERE NOT EXISTS(SELECT 1

  FROM idb_hierarchical B

  WHERE I.ID=B.PARENT_ID)

 START WITH PARENT_ID IS NULL

CONNECT BY PARENT_ID = PRIOR ID;

表2

STR_LEVEL    ID    PARENT_ID    LVL

+……….H    8    4    5

+……….I    9    4    5

+……..G    7    3    4

+……E    5    2    3

+……F    6    2    3

+……L    12    11    3

+….M    13    10    2

显示所有节点，标明该行是否为叶节点SQL

view plaincopy to clipboardprint?

SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL,

NVL((SELECT 'N'

  FROM idb_hierarchical B

  WHERE I.ID=B.PARENT_ID

  AND ROWNUM  < 2),'Y') IS_LEAF

  FROM idb_hierarchical I

 START WITH PARENT_ID IS NULL

CONNECT BY PARENT_ID = PRIOR ID;

[sql] view plaincopy

SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL,

NVL((SELECT 'N'

  FROM idb_hierarchical B

  WHERE I.ID=B.PARENT_ID

  AND ROWNUM  < 2),'Y') IS_LEAF

  FROM idb_hierarchical I

 START WITH PARENT_ID IS NULL

CONNECT BY PARENT_ID = PRIOR ID;

表3

STR_LEVEL    ID    PARENT_ID    LVL    IS_LEAF

+..A    1         1    N

+....B    2    1    2    N

+......C    3    2    3    N

+........D    4    3    4    N

+..........H    8    4    5    Y

+..........I    9    4    5    Y

+........G    7    3    4    Y

+......E    5    2    3    Y

+......F    6    2    3    Y

+..J    10         1    N

+....K    11    10    2    N

+......L    12    11    3    Y

+....M    13    10    2    Y

oracle 9i 查询根节点

view plaincopy to clipboardprint?

SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL

  FROM idb_hierarchical I

 START WITH id =2

CONNECT BY PARENT_ID = PRIOR ID;

[sql] view plaincopy

SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL

  FROM idb_hierarchical I

 START WITH id =2

CONNECT BY PARENT_ID = PRIOR ID;

表4

STR_LEVEL    ID    PARENT_ID    LVL

+..B    2    1    1

+....C    3    2    2

+......D    4    3    3

+........H    8    4    4

+........I    9    4    4

+......G    7    3    3

+....E    5    2    2

+....F    6    2    2

根节点ID应该为3、5、6，即lvl为1即可

查询根节点，只显示根节点SQL

view plaincopy to clipboardprint?

SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,

       ID,

       PARENT_ID,

       LEVEL LVL,

       (select b.str

          from idb_hierarchical b

         where level = 1

         start with b.id = 2

        connect by prior b.id =  b.parent_id

        ) root_str

  FROM idb_hierarchical I

 where level = 1

 START WITH id = 2

CONNECT BY PARENT_ID = PRIOR ID;

[sql] view plaincopy

SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,

       ID,

       PARENT_ID,

       LEVEL LVL,

       (select b.str

          from idb_hierarchical b

         where level = 1

         start with b.id = 2

        connect by prior b.id =  b.parent_id

        ) root_str

  FROM idb_hierarchical I

 where level = 1

 START WITH id = 2

CONNECT BY PARENT_ID = PRIOR ID;

表5

STR_LEVEL    ID    PARENT_ID    LVL    ROOT_STR

+..B    2    1    1    B

标明根节点SQL

view plaincopy to clipboardprint?

SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,

       ID,

       PARENT_ID,

       DECODE(LEVEL, 1, 'Y', 'N') is_root,

       LEVEL LVL,

       (select b.str

          from idb_hierarchical b

         where level = 1

         start with b.id = 2

        connect by prior b.id = b.parent_id) root_str

  FROM idb_hierarchical I

 START WITH id = 2

CONNECT BY PARENT_ID = PRIOR ID;

[sql] view plaincopy

SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,

       ID,

       PARENT_ID,

       DECODE(LEVEL, 1, 'Y', 'N') is_root,

       LEVEL LVL,

       (select b.str

          from idb_hierarchical b

         where level = 1

         start with b.id = 2

        connect by prior b.id = b.parent_id) root_str

  FROM idb_hierarchical I

 START WITH id = 2

CONNECT BY PARENT_ID = PRIOR ID;

表6

STR_LEVEL    ID    PARENT_ID    IS_ROOT    LVL    ROOT_STR

+..B    2    1    Y    1    B

+....C    3    2    N    2    B

+......D    4    3    N    3    B

+........H    8    4    N    4    B

+........I    9    4    N    4    B

+......G    7    3    N    3    B

+....E    5    2    N    2    B

+....F    6    2    N    2    B

在oracle 10g提供了connect_by_isleaf和connect_by_root

oracle 10g用connect_by_isleaf判断叶节点

view plaincopy to clipboardprint?

SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL

  FROM idb_hierarchical I

where connect_by_isleaf=1

 START WITH PARENT_ID IS NULL

CONNECT BY PARENT_ID = PRIOR ID;

[sql] view plaincopy

SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL

  FROM idb_hierarchical I

where connect_by_isleaf=1

 START WITH PARENT_ID IS NULL

CONNECT BY PARENT_ID = PRIOR ID;

表7

STR_LEVEL    ID    PARENT_ID    LVL

+..........H    8    4    5

+..........I    9    4    5

+........G    7    3    4

+......E    5    2    3

+......F    6    2    3

+......L    12    11    3

+....M    13    10    2

view plaincopy to clipboardprint?

SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL,

decode(connect_by_isleaf,1,'Y','N') IS_LEAF

  FROM idb_hierarchical I

 START WITH PARENT_ID IS NULL

CONNECT BY PARENT_ID = PRIOR ID;

[sql] view plaincopy

SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL,

decode(connect_by_isleaf,1,'Y','N') IS_LEAF

  FROM idb_hierarchical I

 START WITH PARENT_ID IS NULL

CONNECT BY PARENT_ID = PRIOR ID;

表8

STR_LEVEL    ID    PARENT_ID    LVL    IS_LEAF

+..A    1         1    N

+....B    2    1    2    N

+......C    3    2    3    N

+........D    4    3    4    N

+..........H    8    4    5    Y

+..........I    9    4    5    Y

+........G    7    3    4    Y

+......E    5    2    3    Y

+......F    6    2    3    Y

+..J    10         1    N

+....K    11    10    2    N

+......L    12    11    3    Y

+....M    13    10    2    Y

oracle 10g用connect_by_root判断根节点

view plaincopy to clipboardprint?

SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,

       ID,

       PARENT_ID,

       LEVEL LVL,

       connect_by_root STR ROOT_STR

  FROM idb_hierarchical I

 START WITH id = 2

CONNECT BY PARENT_ID = PRIOR ID;

[sql] view plaincopy

SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,

       ID,

       PARENT_ID,

       LEVEL LVL,

       connect_by_root STR ROOT_STR

  FROM idb_hierarchical I

 START WITH id = 2

CONNECT BY PARENT_ID = PRIOR ID;

表9

STR_LEVEL    ID    PARENT_ID    LVL    ROOT_STR

+..B    2    1    1    B

+....C    3    2    2    B

+......D    4    3    3    B

+........H    8    4    4    B

+........I    9    4    4    B

+......G    7    3    3    B

+....E    5    2    2    B

+....F    6    2    2    B

view plaincopy to clipboardprint?

SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,

       ID,

       PARENT_ID,

       DECODE(LEVEL, 1, 'Y', 'N') is_root,

       LEVEL LVL,

       connect_by_root STR ROOT_STR

  FROM idb_hierarchical I

 START WITH id = 3

CONNECT BY PARENT_ID = PRIOR ID;

[sql] view plaincopy

SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,

       ID,

       PARENT_ID,

       DECODE(LEVEL, 1, 'Y', 'N') is_root,

       LEVEL LVL,

       connect_by_root STR ROOT_STR

  FROM idb_hierarchical I

 START WITH id = 3

CONNECT BY PARENT_ID = PRIOR ID;

表10

STR_LEVEL    ID    PARENT_ID    IS_ROOT    LVL    ROOT_STR

+..C    3    2    Y    1    C

+....D    4    3    N    2    C

+......H    8    4    N    3    C

+......I    9    4    N    3    C

+....G    7    3    N    2    C

view plaincopy to clipboardprint?

SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,

       ID,

       PARENT_ID,

       DECODE(LEVEL, 1, 'Y', 'N') is_root,

       LEVEL LVL,

       connect_by_root STR ROOT_STR

  FROM idb_hierarchical I

 START WITH PARENT_ID = 2

CONNECT BY PARENT_ID = PRIOR ID;

[sql] view plaincopy

SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,

       ID,

       PARENT_ID,

       DECODE(LEVEL, 1, 'Y', 'N') is_root,

       LEVEL LVL,

       connect_by_root STR ROOT_STR

  FROM idb_hierarchical I

 START WITH PARENT_ID = 2

CONNECT BY PARENT_ID = PRIOR ID;

表11

STR_LEVEL    ID    PARENT_ID    IS_ROOT    LVL    ROOT_STR

+..C    3    2    Y    1    C

+....D    4    3    N    2    C

+......H    8    4    N    3    C

+......I    9    4    N    3    C

+....G    7    3    N    2    C

+..E    5    2    Y    1    E

+..F    6    2    Y    1    F

[转]Oracle查询树形数据的叶节点和子节点的更多相关文章

ORACLE 查询一个数据表后通过遍历再插入另一个表中的两种写法
ORACLE 查询一个数据表后通过遍历再插入另一个表中的两种写法语法第一种: 通过使用Oracle语句块 --指定文档所有部门都能查看 declare cursor TABLE_DEPT and ...
oracle 查询本周数据生成下周数据
CreateTime--2018年1月4日16:38:01 Author:Marydon oracle 查询本周数据生成下周数据第一步:查询指定区间数据第二步:改变查询结果的值查询日期字段+ ...
SqlServer父节点与子节点查询及递归
在最近老是用到这个SQL,所以记下来了: 1:创建表 CREATE TABLE [dbo].[BD_Booklet]( [ObjID] [int] IDENTITY(1,1) NOT NULL, [P ...
Web网页树形列表中实现选中父节点则子节点全选和不选中父则子全不选
需要实现的功能:选中父节点对应子节点全选:不选中父节点,对应子节点也不选中如下图所示,选中车队,对应车队中车辆也全部选中,以实现车队中所有车辆在地图上的显示. 选中cqupt ...
zTree实现清空选中的第一个节点的子节点
zTree实现清空选中的第一个节点的子节点 1.实现源代码 <!DOCTYPE html> <html> <head> <title>zTree实现基本 ...
总结获取原生JS(javascript)的父节点、子节点、兄弟节点
关于原生JS获取节点,一直是个头疼的问题,而且调用方法的名字又贼长了,所以我选择用JQ,好像跑题了-- 话不多说看代码获取父节点及父节点下所有子节点(兄弟节点) <ul> <l ...
C#中treeview的问题，如何区分根节点和子节点以及根节点和根节点的兄弟节点？
根节点的Level属性为0,一级子节点Level属性为1,二级子节点Level属性为2,以此类推:同级节点可以用索引.名称.文本来区分.用索引区分根节点时,TreeView.Nodes[0]就是第一个 ...
JavaScript的DOM编程--04--获取元素节点的子节点
获取元素节点的子节点(**只有元素节点才有子节点!!) 1). childNodes 属性获取全部的子节点, 但该方法不实用. 因为如果要获取指定的节点的指定子节点的集合, 可以直接调用元素节点的 ...
jQuery获取节点和子节点文本的方法
本节主要介绍了jQuery如何获取节点和子节点文本,下面有个示例,大家可以参考下对于下面的html片段, ? 1 <div id="text_test">test t ...

随机推荐

ReactNative-----环境搭建二(android)
一.初始化一个ReactNative项目在指定目录运行命令:react-native init Vince(项目名称) //其过程就是在使用CLI工具构建项目, 命令行代码 F:\React> ...
专题二、ArrayList序列化技术细节详解
一.绪论所谓的JAVA序列化与反序列化,序列化就是将JAVA 对象以一种的形式保持,比如存放到硬盘,或是用于传输.反序列化是序列化的一个逆过程. JAVA规定被序列化的对象必须实现java.io.S ...
Python没有执行__init__
疑惑提出问题前天同事问我一个问题,为什么这个脚本中的没有调用A 的__init__.脚本如下: class A(object): def __init__(self, *args, **kwarg ...
在hyper安装openwrt
写了长长长一篇文章,结果把标签关了,这篇文章就不见了,草稿箱也没有!!! 只好直接copy原来作者的文章了下载地址 openwrt image tulip driver 引用 Want to add ...
HTML块
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content ...
用javascript操作xml(三)关于Jquery的html()不兼容IE的解决办法
当 $("#xxx").html(data); 不兼容,方法替换为 document.getElementById("xxx").innerHTML=data;
禁止选择文本和禁用右键 v1.0
var zhonghao={ //绑定事件 myAddEvent: function(obj, sEvent, fn){if(obj.attachEvent){obj.attachEvent('on' ...
限制apache错误日志大小
①配置错误日志在http.conf配置: ErrorLog "| /opt/lampp/bin/rotatelogs /opt/lampp/logs/%Y_%m_%d_error_log ...
安装 SQL Server 2012 的硬件和软件要求(官方全面)
以下各节列出了安装和运行 SQL Server 2012 的最低硬件和软件要求. 有关 SharePoint 集成模式下 Analysis Services 的要求的详细信息,请参阅硬件和软件要求(S ...
一个Highcharts的例子
关键字:Highcharts <!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Typ ...

[转]Oracle查询树形数据的叶节点和子节点

[转]Oracle查询树形数据的叶节点和子节点的更多相关文章

随机推荐

热门专题