Oracle 仿 mysql的group_concat()函数
2014-04-14 09:04
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CREATE OR REPLACE FUNCTION F_CONCAT_ROW_COMMUNITY_LABEL(p_field IN VARCHAR2,
p_parent_id IN VARCHAR2,
p_splicing IN VARCHAR2)
RETURN VARCHAR2 IS
retResult VARCHAR2(32767);
TYPE cur_type IS REF CURSOR;
rscur cur_type;
rsVal VARCHAR2(2000);
cnt INTEGER;
BEGIN
cnt := 0;
--"select distinct " || p_field || " from community_label cl join bkm_relation br on(br.child_id = cl.id) where br.relation_type = '2' and br.parent_id in ( select v.id from v_community_knowledge v where v.deleted_flag
= '0' and v.root_id = (select v2.root_id from v_community_knowledge v2 where v2.id = " || p_parent_id || " ) )";
--dbms_output.put_line('select ' || p_field || ' from ' || p_tableName || ' where id in (select child_id from bkm_relation where parent_id = ''' || p_parent_id || ''' and relation_type
= ''' || p_relation_type || ''')');
--上面的是注释
OPEN rscur FOR 'select distinct cl.' || p_field || ' from community_label cl join bkm_relation br on(br.child_id = cl.id)
where br.relation_type = ''2'' and br.parent_id in (
select v.id from v_community_knowledge v
where v.deleted_flag = ''0'' and v.root_id = (
select v2.root_id from v_community_knowledge v2
where v2.id =''' || p_parent_id || ''' ))';
LOOP
FETCH rscur
INTO rsVal;
EXIT WHEN rscur%NOTFOUND;
IF cnt > 0 THEN
retResult := retResult || p_splicing;
END IF;
retResult := retResult || rsVal;
cnt := cnt + 1;
END LOOP;
CLOSE rscur;
return retResult;
EXCEPTION
-- exception handlers begin
WHEN VALUE_ERROR THEN
--
retResult := '';
RETURN retResult;
END F_CONCAT_ROW_COMMUNITY_LABEL;
/**
* example: select F_CONCAT_ROW('id','community_kn_catagory','3',id,',') from community_knowledge;
* 2013/3/11
**/
p_parent_id IN VARCHAR2,
p_splicing IN VARCHAR2)
RETURN VARCHAR2 IS
retResult VARCHAR2(32767);
TYPE cur_type IS REF CURSOR;
rscur cur_type;
rsVal VARCHAR2(2000);
cnt INTEGER;
BEGIN
cnt := 0;
--"select distinct " || p_field || " from community_label cl join bkm_relation br on(br.child_id = cl.id) where br.relation_type = '2' and br.parent_id in ( select v.id from v_community_knowledge v where v.deleted_flag
= '0' and v.root_id = (select v2.root_id from v_community_knowledge v2 where v2.id = " || p_parent_id || " ) )";
--dbms_output.put_line('select ' || p_field || ' from ' || p_tableName || ' where id in (select child_id from bkm_relation where parent_id = ''' || p_parent_id || ''' and relation_type
= ''' || p_relation_type || ''')');
--上面的是注释
OPEN rscur FOR 'select distinct cl.' || p_field || ' from community_label cl join bkm_relation br on(br.child_id = cl.id)
where br.relation_type = ''2'' and br.parent_id in (
select v.id from v_community_knowledge v
where v.deleted_flag = ''0'' and v.root_id = (
select v2.root_id from v_community_knowledge v2
where v2.id =''' || p_parent_id || ''' ))';
LOOP
FETCH rscur
INTO rsVal;
EXIT WHEN rscur%NOTFOUND;
IF cnt > 0 THEN
retResult := retResult || p_splicing;
END IF;
retResult := retResult || rsVal;
cnt := cnt + 1;
END LOOP;
CLOSE rscur;
return retResult;
EXCEPTION
-- exception handlers begin
WHEN VALUE_ERROR THEN
--
retResult := '';
RETURN retResult;
END F_CONCAT_ROW_COMMUNITY_LABEL;
/**
* example: select F_CONCAT_ROW('id','community_kn_catagory','3',id,',') from community_knowledge;
* 2013/3/11
**/
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