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POUpdate a column with hierarchy structure in oracle
 

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  1. POUpdate a column with hierarchy structure in oracle
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    <p>I have a <code>service</code>'s table as below:</p> <pre><code>CREATE TABLE service Id number, Name varchar2(50), ParentId number, PcCode varchar(50); </code></pre> <p>And data of the <code>service</code>'s table:</p> <pre><code>ID NAME PARENTID PCCODE 1 Test1 0 Null 2 Test2 0 Null 3 Test3 1 Null 4 Test4 1 Null 5 Test5 1 Null 6 Test6 2 Null 7 Test7 2 Null 8 Test8 2 Null 9 Test9 2 Null 10 Test10 3 Null 11 Test11 3 Null </code></pre> <p>And I want to update the <code>PcCode</code> column. This is dependent on the <code>Id</code> column and the <code>ParentId</code> column. Example: </p> <pre><code> Id = 1, ParentId = 0 =&gt; PcCode = '001' Id = 2, ParentId = 0 =&gt; PcCode = '002' Id = 3, ParentId = 1 =&gt; PcCode = '001001' Id = 4, ParentId = 1 =&gt; PcCode = '001002' ..... </code></pre> <p><strong>Update</strong></p> <p>I have written 2 sp (2 way) for update <code>PcCode</code>'s column, but I think it's not doing very good.</p> <p><code>Sp1</code>: (done)</p> <pre><code>create or replace procedure service_hierarchy is cursor c_service is select * from service d; cursor c_parents is select k.parentid from service k group by k.parentid order by k.parentid; begin for obj1 in c_service loop update service e set e.pccode = lpad(to_char(rownum), 3, '0') where e.parentid = service.parentid; end loop; for obj2 in c_parents loop update service e set e.pccode = (select f.pccode from service f where f.id = obj2.parentid) || e.pccode where e.parentid = obj2.parentid; end loop; end; </code></pre> <p><code>Sp2</code>: error - It's done. But it returns a result false. And I don't know how to work correctly.</p> <pre><code>CREATE OR REPLACE PROCEDURE service_hierarchy_2 ( parentId NUMBER := 0 ) IS CURSOR v_data IS SELECT * FROM service WHERE parentId = parentId; BEGIN IF (parentId = 0) THEN UPDATE service SET pccode = LPAD(ROWNUM , 3, '0') WHERE parentid = parentId; ELSE FOR data IN v_data LOOP UPDATE service SET pccode = (SELECT 1 FROM service WHERE Id = parentId) || LPAD(ROWNUM , 3, '0') WHERE parentid = parentId; service_hierarchy_2(data.Id); END LOOP; END IF; END; </code></pre> <p>Please help me to resolve <code>sp2</code> or one way be better than 2 sp on top. Thanks!</p>
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