测试一下，查询节点7的所有3度关联节点信息，如下

dap=# select * from demo.f_get_rel(7,0,3);
 direct | cur_depth | up_node | down_node | trace
--------+-----------+---------+-----------+-----------
  1 |   1 |  7 |   2 | {7,2}
  1 |   1 |  7 |   4 | {7,4}
  1 |   2 |  2 |   4 | {7,2,4}
  -1 |   1 |  3 |   7 | {3,7}
  -1 |   1 |  4 |   7 | {4,7}
  -1 |   1 |  5 |   7 | {5,7}
  -1 |   2 |  2 |   4 | {2,4,7}
  -1 |   2 |  6 |   5 | {6,5,7}
  -1 |   3 |  1 |   2 | {1,2,4,7}
  -1 |   3 |  5 |   2 | {5,2,4,7}
(10 rows)

图形显示结果

ECharts模板

在没有集成图形界面之前，使用ECharts的示例代码（地址），可以直观的查看关系图谱。对官方样表进行微调之后，代码如下
注意 代码中的 data 和 links 部分需要进行替换

option = {
 title: {
  text: '数据图谱'
 },
 tooltip: {},
 animationDurationUpdate: 1500,
 animationEasingUpdate: 'quinticInOut',
 series : [
  {
   type: 'graph',
   layout: 'force',
   force: {
     repulsion: 1000
    },
   focusNodeAdjacency: true,
   symbolSize: 30,
   roam: true,
   label: {
    normal: {
     show: true
    }
   },
   edgeSymbol: ['circle', 'arrow'],
   edgeSymbolSize: [4, 10],
   edgeLabel: {
    normal: {
     textStyle: {
      fontSize: 20
     }
    }
   },
   data: [
    { name:"2", draggable: true, symbolSize:20},
   ],
   links: [
    { source:"2", target:"4"},
   ],

  }
 ]
};

造显示用数据

构造 data 部分

-- 根据节点的关联点数量，设置图形大小
with rel as (select * from f_get_rel(7,0,2)),
	up_nodes as (select up_node, count(distinct down_node) as out_cnt from rel group by up_node),
	down_nodes as (select down_node, count(distinct up_node) as in_cnt from rel group by down_node),
	node_cnt as ( select up_node as node, out_cnt as cnt from up_nodes union all select * from down_nodes )
select '{ name:"' || n.node || '", draggable: true, symbolSize:' || sum(n.cnt) * 10 || '},' as node
	from node_cnt n
group by n.node
order by 1;

构造 links 部分

select distinct r.up_node, r.down_node, '{ source:"'|| r.up_node ||'", target:"'|| r.down_node ||'"},' as links 
	from f_get_rel(7,0,3) r
order by r.up_node	;

图形显示

把构造的data和links替换到ECharts代码里面

查询节点7的所有2度关联节点信息，结果显示如下

查询节点7的所有关联节点信息（不限层级数），结果显示如下

总结

以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，谢谢大家对IIS7站长之家的支持。