Question

测试查询：

select * from testarray(1120,'{"oserial":
["10002695","10002692"],"nserial":[{"serial":"10002693","price":"180.00"},
{"serial":"10002697","price":"180.00"}]}');

CREATE OR REPLACE FUNCTION public.testarray(salesid int,items json) 
RETURNS int
LANGUAGE plpgsql
AS $$
declare
  resu text;
  resu2 text := 'TH';
  ssrow RECORD;
  oserlen int := 0;
  counter int := 0;
begin
  select json_array_length(items::json->'oserial') into oserlen;
  while counter < oserlen loop
    -- if I change 0 to counter, this function does not work
    select (items::json#>>'{oserial,0}') into resu; 
    select * into ssrow 
    from salesserial 
    where fk_salesid=salesid 
      and serialnum=resu::int;

    insert into stockloct(serialnum,fk_barcode,source,exflag) 
    values(ssrow.serialnum,ssrow.fk_barcode,ssrow.fk_salesid,true);

    counter := counter + 1;
  end loop; 
  select items::json#>'{nserial,0,serial}' into resu2;
  return oserlen;
end;
$$;

我正在测试PostgreSQL函数。

下面的这一行似乎无效，有人可以帮我吗。提前致谢。我正在使用9.5版的Postgresql。如果我将json字符串中的0更改为counter变量，则select不返回值。它仅适用于数字，不适用于变量。

select (items::json#>>'{oserial,0}') into resu; 
-- if i change 0 to counter variable, this select returns null i think as the insert below the line fails;

Answer 1

#>>的右侧参数是一个文本数组。替换

select (items::json#>>'{oserial,0}') into resu;

使用

select items::json#>>array['nserial',counter::text] into resu;

Json运算符似乎不适用于变量

1 个答案: