Question

您好我正在创建一个插入元数据的过程。我创建了类型，我在另一种类型中包含了1种类型，在程序中我正在迭代它以获取值。因为我是PostgreSQL的新手任何人都可以帮助我如何调用该程序。输入参数是

类型

Create Type Form_details as(
                     formName character varying(100),
                     submittedBy numeric,
                      createdDate date,    
                     updatedBy numeric,
                     updatedDate date,
                     comments character varying(500),
                  Sections Section[]  

)

create type Section as (
                           sectionName character varying(100),
                           sectionLabel character varying(100),                           
                           sectionOrder numeric                           



                     )

我写的程序是

    CREATE OR REPLACE FUNCTION form_insertion(formdetails form_details[])
  RETURNS character varying AS
$BODY$

DECLARE 
         form_details_seq integer;
         section_seq integer;
         formName character varying(100);
         submittedBy numeric;
         createdDate date;    
         comments character varying(500);
                formStatusId numeric;

         sectionOrder numeric;
         sectionName character varying(100);
         sectionLabel character varying(100);
         attributeId numeric;

         I integer;
         J integer;
begin
FOR I IN 1..formdetails.COUNT

LOOP

formName             :=formdetails[I].formName;
formStatusId         :=formdetails[I].formStatusId;
comments             :=formdetails[I].comments;
  RAISE NOTICE '%', formName;

  FOR J IN 1..formdetails.Section.COUNT
   LOOP

   sectionName             :=formdetails[I].Section[J].sectionName;
 RAISE NOTICE '%', sectionName;

   END LOOP ;


END LOOP;

Return formName,sectionName;
end;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;

这不是完整的程序。但我试图用这个来测试。您能告诉我我的方法是否正确，如何从数据库端进行测试。我将如何传递此参数。顺便说一下，我创建的类型来自Java对象。这个过程将从Java端调用。任何帮助将不胜感激。

Answer 1

要从SQL查询调用该函数，必须将参数强制转换为自定义类型，如以下示例所示。

select form_insertion(array[
    cast(row('Form 1', 1, current_date, 1, current_date, 'This is form 1', 
        array[
            cast(row('section-1', 'Section One', 1) as section),
            cast(row('section-2', 'Section Two', 2) as section),
            cast(row('section-3', 'Section Three', 3) as section)
        ]
    ) as form_details),
    cast(row('Form 2', 2, current_date, 1, current_date, 'This is form 2', 
        array[
            cast(row('section-2', 'Section Two', 2) as section),
            cast(row('section-3', 'Section Three', 3) as section)
        ]
    ) as form_details),
    cast(row('Form 3', 1, current_date, 1, current_date, 'This is form 3', 
        array[
            cast(row('section-1', 'Section One', 1) as section),
            cast(row('section-3', 'Section Three', 3) as section)
        ]
    ) as form_details)
])

请注意，PostgreSQL数组不具有.COUNT属性。您可以使用array_upper函数遍历索引范围的数组：

for i IN 1..array_upper(formdetails, 1)
LOOP 
   -- your code here
END LOOP;

自PostgreSQL 9.1以来，您可以使用FOREACH语句遍历数组：

create or replace function form_insertion(formdetails form_details[])
    returns varchar as $$
declare
    detail form_details;
    sec section;
begin
    foreach detail in array formdetails
    LOOP 
       RAISE NOTICE '%', detail.formName;

       foreach sec in array detail.sections
       LOOP
         raise NOTICE '%', sec.sectionName;
       END LOOP;
    END LOOP;
    return '';
end;$$
    language plpgsql;

用户定义类型作为PostgreSQL函数中的输入参数

1 个答案: