oracle - PLS-00497 : cannot mix between single row and multi-row (BULK) in INTO list

Question

我创建了一个采购程序来使用BULK COLLECT显示两个表中的数据，但我不断收到此错误。

PLS-00497: cannot mix between single row and multi-row (BULK) in INTO list

但是，如果我删除 BULK COLLECT 并在语句中包含 where 子句，它就会起作用。

create or replace PROCEDURE sktReport IS

  TYPE inventory_table_type is RECORD (
                    v_WH_ID                  INVENTORY.WH_ID%TYPE,
                    v_wa_Product_quantity_id Product_quantity.ST_ID%TYPE); 
  v_inventory_table inventory_table_type;
BEGIN

  SELECT INVENTORY.WH_ID, Product_quantity.ST_ID,  
    BULK COLLECT INTO
     v_inventory_table.v_WH_ID, 
     v_inventory_table.v_wa_Product_quantity_id,  
   FROM INVENTORY
  INNER JOIN Product_quantity
     ON Product_quantity.ST_ID = INVENTORY.ST_ID;

  FOR i IN v_inventory_table.v_WH_ID..v_inventory_table.v_WH_ID
  LOOP
    DBMS_OUTPUT.PUT_LINE ('ID : ' || v_inventory_table.v_WH_ID
                          || ' quantity ID : ' || v_inventory_table.v_in_Product_quantity_id);
  END LOOP;

END;

Answer 1

这是一个简单的展示，我刚刚写的，可能会对您有所帮助:)

SET SERVEROUTPUT ON;
DECLARE
  TYPE t_some_type IS RECORD (
    the_id  NUMBER
    ,the_name VARCHAR2(1)
  );
  TYPE t_some_type_tab IS TABLE OF t_some_type;

  lt_some_record  t_some_type;
  lt_some_array t_some_type_tab := NEW t_some_type_tab();
BEGIN

  WITH some_values AS (
    SELECT
      DECODE(LEVEL,1,1,2,2,3,3,4,4) AS the_id
      ,DECODE(LEVEL,1,'A',2,'B',3,'C',4,'D') AS the_name
    FROM
      dual
    CONNECT BY LEVEL < 5
  )
  SELECT
    sv.the_id
    ,sv.the_name
  BULK COLLECT INTO -- use this to select into an array/collection type variable
    lt_some_array
  FROM
    some_values sv;

  DBMS_OUTPUT.PUT_LINE(lt_some_array.COUNT);

  WITH some_values AS (
    SELECT
      DECODE(LEVEL,1,1,2,2,3,3,4,4) AS the_id
      ,DECODE(LEVEL,1,'A',2,'B',3,'C',4,'D') AS the_name
    FROM
      dual
    CONNECT BY LEVEL < 5
  )
  SELECT
    sv.the_id
    ,sv.the_name
  INTO -- use this to select into a regular variables
    lt_some_record.the_id
    ,lt_some_record.the_name
  FROM
    some_values sv
  WHERE
    sv.the_id = 1;

  DBMS_OUTPUT.PUT_LINE(lt_some_record.the_id||': '||lt_some_record.the_name);

  -- you can also insert such record into your array type variable
  lt_some_array := NEW t_some_type_tab();
  lt_some_array.EXTEND; -- extend the array type variable (so it could store one more element, than now - which was 0)
  lt_some_array(lt_some_array.LAST) := lt_some_record; -- assign the first element of array type variable

  DBMS_OUTPUT.PUT_LINE(lt_some_array.COUNT||'  '||lt_some_array(lt_some_array.LAST).the_id||': '||lt_some_array(lt_some_array.LAST).the_name);

END;
/

此外，由于您想迭代结果，因此可以仅使用光标(隐式或显式)，例如

DECLARE
  -- cursor declaration
  CURSOR c_some_cursor IS
  WITH some_values AS (
    SELECT
      DECODE(LEVEL,1,1,2,2,3,3,4,4) AS the_id
      ,DECODE(LEVEL,1,'A',2,'B',3,'C',4,'D') AS the_name
    FROM
      dual
    CONNECT BY LEVEL < 5
  )
  SELECT
    sv.the_id
    ,sv.the_name
  FROM
    some_values sv;

BEGIN
  -- using explicit, earlier declared cursor
  FOR c_val IN c_some_cursor
  LOOP
    DBMS_OUTPUT.PUT_LINE(c_val.the_id||': '||c_val.the_name);
  END LOOP;


  -- using implicit, not declared cursor
  FOR c_val IN (
    WITH some_values AS (
      SELECT
        DECODE(LEVEL,1,1,2,2,3,3,4,4) AS the_id
        ,DECODE(LEVEL,1,'A',2,'B',3,'C',4,'D') AS the_name
      FROM
        dual
      CONNECT BY LEVEL < 5
    )
    SELECT
      sv.the_id
      ,sv.the_name
    FROM
      some_values sv
  )
  LOOP
    DBMS_OUTPUT.PUT_LINE(c_val.the_id||': '||c_val.the_name);
  END LOOP;
END;
/