程序无法返回大字符串响应（~293 个字符）

Question

下面是我的存储过程

create or replace PROCEDURE PR_GETECOUNT  
( ,P_YEAR IN NUMBER
,P_RECORDSET OUT  NVARCHAR2
) AS 
l_r_count varchar2(400);
l_v_count varchar2(400);
l_e_count varchar2(400);
l_p_count varchar2(400);
l_s_count varchar2(400);
l_n_count varchar2(400);
l_e_count_upadted  NVARCHAR2(4000);
BEGIN

l_r_count:=FN_GETECOUNT( 'R',P_YEAR);
l_v_count:=FN_GETECOUNT( 'V',P_YEAR);
l_e_count:=FN_GETECOUNT( 'E',P_YEAR);
l_p_count:=FN_GETECOUNT( 'P',P_YEAR);
l_s_count:=FN_GETECOUNT( 'S',P_YEAR);
l_n_count:=FN_GETECOUNT( 'N',P_YEAR);

--the values returned by FN_GETECOUNT are as below
l_r_count:='{"R":[375,127,136,650,130,169,009,015,094,027]}';
l_v_count:='{"V":[375,127,136,650,130,169,009,015,094,027]}';
l_e_count:='{"E":[375,127,136,650,130,169,009,015,094,027]}';
l_p_count:='{"P":[375,127,136,650,130,169,009,015,094,027]}';
l_s_count:='{"S":[375,127,136,650,130,169,009,015,094,027]}';
l_n_count:='{"N":[375,127,136,650,130,169,009,015,094,027]}';

--preparing response
l_e_count_upadted:='['||l_r_count||','||l_v_count||','||l_e_count||','||l_p_count||','||l_s_count||','||l_n_count||']'

  select l_e_count_upadted INTO P_RECORDSET FROM dual;
  

END PR_GETECOUNT;

预期回应

  [{"R":[375,127,136,650,130,169,009,015,094,027]},{"V":[375,127,136,650,130,169,009,015,094,027]},{"E":[375,127,136,650,130,169,009,015,094,027]},{"P":[375,127,136,650,130,169,009,015,094,027]},{"S":[375,127,136,650,130,169,009,015,094,027]},{"N":[375,127,136,650,130,169,009,015,094,027]}]

实际回复为空

但是，如果响应值的长度很短，则记录集返回正确的响应 例如

[{"R":[0,0,0,0,1,0,0,0,0,0]},{"V":[0,0,0,0,0,0,0,0,0,1]},{"E":[0,0,0,0,0,0,0,0,0,0]},{"P":[0,0,0,0,0,0,0,0,0,0]},{"S":[4,7,2,4,12,2,3,3,9,0]},{"N":[17,3,23,4,44,55,5,2,1,0]}]

这似乎是最大 varchar2 大小的限制。请建议如何解决。

Answer 1

您的程序可以简化为：

CREATE PROCEDURE PR_GETECOUNT(
  P_YEAR      IN  NUMBER
, P_RECORDSET OUT NVARCHAR2
) AS 
BEGIN
  P_RECORDSET := '['
              || FN_GETECOUNT( 'R',P_YEAR) || ','
              || FN_GETECOUNT( 'V',P_YEAR) || ','
              || FN_GETECOUNT( 'E',P_YEAR) || ','
              || FN_GETECOUNT( 'P',P_YEAR) || ','
              || FN_GETECOUNT( 'S',P_YEAR) || ','
              || FN_GETECOUNT( 'N',P_YEAR) || ']';
END PR_GETECOUNT;
/

然后假设你的其他功能是：

CREATE FUNCTION FN_GETECOUNT(
  p_VALUE IN VARCHAR2,
  p_year  IN NUMBER
) RETURN VARCHAR2
IS
BEGIN
  RETURN '{"' || p_value || '":[375,127,136,650,130,169,009,015,094,027]}';
END;
/

然后：

DECLARE
  p_recordset NVARCHAR2(400);
BEGIN
  PR_GETECOUNT(42, p_recordset);
  DBMS_OUTPUT.PUT_LINE(p_recordset);
END;
/

输出：

[{"R":[375,127,136,650,130,169,009,015,094,027]},{"V":[375,127,136,650,130,169,009,015,094,027]},{"E":[375,127,136,650,130,169,009,015,094,027]},{"P":[375,127,136,650,130,169,009,015,094,027]},{"S":[375,127,136,650,130,169,009,015,094,027]},{"N":[375,127,136,650,130,169,009,015,094,027]}]

但是，不清楚为什么您使用

NVARCHAR2

而不是像所有其他变量一样使用

VARCHAR2

。

当Oracle 12及更高版本支持生成JSON时，手动生成JSON似乎也是错误的。

小提琴