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我正在用这个编写一个 PL/pgSQL 函数:

cols_to_select := according to a set of rules, we get the name of the columns

FOR I IN EXECUTE 'SELECT '||cols_to_select||' FROM tabl' LOOP
  -- how to access to fields of record I without knowing their names?
  -- 

END LOOP;
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1 回答 1

2

这是我想出的一种方法:

cols_to_select := according to a set of rules, we get the name of the columns

FOR I IN EXECUTE 'SELECT ARRAY['||cols_to_select||'] as AR FROM tabl' LOOP
  -- how to access to fields of record I without knowing their names?
  FOR j IN 1..array_upper(I.ar,1) LOOP
    RAISE NOTICE '%', I.AR[j];
  END LOOP;

END LOOP;

此解决方案的问题是当列具有不同类型时会失败。

于 2009-04-26T18:54:12.317 回答