PostgreSQL函数中的用户定义类型作为输入参数

Question

你好，我正在创建一个插入元数据的过程。我创建了类型，并将一种类型包含在另一种类型中，在过程中我正在迭代它以获取值。由于我是 PostgreSQL 的新手，有人可以帮忙告诉我如何调用该过程吗？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;

这不是完整的过程。但我正在尝试用它进行测试。您能否告诉我我的方法是否正确，以及我如何从DB侧进行测试。我将如何传递此参数。顺便说一句，我创建的类型来自Java对象。此存储过程将从Java端调用。非常感谢任何帮助。

- Rose

Answer 1

要从SQL查询中调用函数，您必须将参数转换为自定义类型，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 数组没有 .COUNT 属性。您可以使用 array_upper 函数按索引范围迭代数组：

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

自从PostgreSQL 9.1以来，您可以使用FOREACH语句循环遍历数组：

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;

- Bolzan