如何使用items表显示数据库中的所有记录?我当前的查询显示项目894的信息。我尝试使用循环,但没有运气。
我有两个表,库存和itemid。其中itemid具有项目编号和描述,库存表中包含项目的信息,例如大小,颜色,价格和库存数量。
set serveroutput on
DECLARE
current_item number(8);
totalvalue number(8,2);
description varchar2(50);
item_id number(3);
CURSOR Inventory_Info IS
SELECT
itemsize
,color
,curr_price
,qoh
,curr_price*qoh as Total
FROM inventory
WHERE itemid=Current_item;
BEGIN
current_item:=894;
totalvAlue:=0;
SELECT
itemdesc, itemid
INTO description, item_id
FROM item
WHERE itemid=current_item;
DBMS_OUTPUT.PUT_LINE('Item ID: ' || TO_CHAR(item_id) || ' Item Description: ' || description);
OPEN Inventory_Info;
LOOP
Fetch Inventory_Info INTO Inventory_rocord;
EXIT WHEN Inventory_Info%NOTFOUND;
DBMS_OUTPUT.PUT_LINE('Size: ' || Inventory_record.itemsize);
DBMS_OUTPUT.PUT_LINE('Color: ' || Inventory_record.color);
DBMS_OUTPUT.PUT_LINE('Price: ' || Inventory_record.curr_price);
DBMS_OUTPUT.PUT_LINE('QOH: ' || Inventory_record.qoh);
DBMS_OUTPUT.PUT_LINE('Value: ' || Inventory_record.total);
TotalValue:=TotalValue + Inventory_record.total;
End Loop;
DBMS_OUTPUT.PUT_LINE('TOTAL VALUE: ' || TotalValue);
Close Inventory_Info;
EXCEPTION
WHEN NO_DATA_FOUND THEN
DBMS_OUTPUT.PUT_LINE('No inventory for Item No. '|| current_item);
WHEN OTHERS THEN
DBMS_OUTPUT.PUT_LINE('Error Message: '|| SQLERRM);
END;
答案 0 :(得分:4)
如果我们暂时忘记格式化,可以使用游标for循环更简单地完成。
set serveroutput ON
DECLARE
BEGIN
FOR item_rec IN (SELECT itemdesc, itemid
FROM item
) LOOP
DBMS_OUTPUT.PUT_LINE('Item ID: ' || TO_CHAR(item_rec.itemid)
|| ' Item Description: ' || item_rec.itemdesc);
FOR Inventory_record IN (SELECT itemsize
, color
, curr_price
, qoh
, curr_price*qoh AS Total
FROM inventory
WHERE itemid = item_rec.itemid
) LOOP
DBMS_OUTPUT.PUT_LINE('Size: ' || Inventory_record.itemsize);
DBMS_OUTPUT.PUT_LINE('Color: ' || Inventory_record.color);
DBMS_OUTPUT.PUT_LINE('Price: ' || Inventory_record.curr_price);
DBMS_OUTPUT.PUT_LINE('QOH: ' || Inventory_record.qoh);
DBMS_OUTPUT.PUT_LINE('Value: ' || Inventory_record.total);
TotalValue:= TotalValue + Inventory_record.total;
END LOOP;
END LOOP;
END;
答案 1 :(得分:1)
您使用单独的SELECT..INTO
来抓取itemid
,但是您将itemid
分配给单个值,并且不会更改它。
查看您的查询,您可以将itemid
提取移动到游标&加入2个表。您将项目提取到inventory_record
,但我没有看到任何地方的定义/声明。
这里我声明一个记录类型变量,包括你要获取的内容,打开游标,将细节提取到该游标中。由于没有明确的where条件,它将在item&之间执行内连接。库存表&获取与连接条件匹配的所有行。
set serveroutput ON
DECLARE
TYPE inventory_rec IS RECORD (
itemid item.itemid%TYPE,
itemdesc item.itemdesc%TYPE,
itemsize inventory.itemsize%TYPE,
color inventory.color%TYPE,
curr_price inventory.curr_price%TYPE,
qoh inventory.qoh %TYPE,
total inventory.curr_price%TYPE); -- record type to hold what cursor will be fetching
inventory_record INVENTORY_REC;
current_item NUMBER(8);
totalvalue NUMBER(8, 2);
description VARCHAR2(50);
item_id NUMBER(3);
CURSOR inventory_info IS
SELECT itemid,
itemdesc,
itemsize,
color,
curr_price,
qoh,
curr_price * qoh AS Total
FROM inventory
join item USING (itemid);
-- join item & inventory, so that it shows listings for all items present in inventory
BEGIN
OPEN inventory_info;
LOOP
FETCH inventory_info INTO inventory_record;
EXIT WHEN inventory_info%NOTFOUND;
dbms_output.Put_line('Current item: '
|| inventory_record.itemdesc);
dbms_output.Put_line('Size: '
|| inventory_record.itemsize);
dbms_output.Put_line('Color: '
|| inventory_record.color);
dbms_output.Put_line('Price: '
|| inventory_record.curr_price);
dbms_output.Put_line('QOH: '
|| inventory_record.qoh);
dbms_output.Put_line('Value: '
|| inventory_record.total);
totalvalue := totalvalue + inventory_record.total;
END LOOP;
dbms_output.Put_line('TOTAL VALUE: '
|| totalvalue);
CLOSE inventory_info;
EXCEPTION
WHEN no_data_found THEN
dbms_output.Put_line('No inventory for Item No. '
|| current_item);
WHEN OTHERS THEN
dbms_output.Put_line('Error Message: '
|| SQLERRM);
END;
答案 2 :(得分:1)
如果它只是一个报告(似乎是)。请考虑使用sql*plus
报告格式化命令以您希望的方式显示查询的输出。
以下是一个例子:
SQL> create table Items(
2 i_num number,
3 i_descr varchar2(101),
4 i_size varchar2(3),
5 i_price number,
6 i_qoh number
7 );
Table created
SQL> create table Inventories(
2 id number,
3 i_num number
4 );
Table created
SQL> insert into items(i_num,i_size,i_price,i_qoh,i_descr)
2 select 1, 'S', 123, 25, 'Item_1' from dual union all
3 select 2, 'L', 424, 12, 'Item_1' from dual union all
4 select 4, 'S', 45, 54, 'Item_4' from dual union all
5 select 5, 'S', 78, 54, 'Item_4' from dual union all
6 select 6, 'S', 123, 22, 'Item_5' from dual union all
7 select 7, 'S', 127, 65, 'Item_5' from dual
8 ;
6 rows inserted
SQL> commit;
Commit complete
SQL> insert into inventories
2 select i_num, i_num
3 from items;
6 rows inserted
SQL> commit;
Commit complete
现在我们的报告:
SQL> column i_descr format a10
SQL> column i_size format a3
SQL> column i_price format 99999
SQL> column i_qoh format 99999
SQL> column value format 99999
SQL> break on i_descr skip 2
SQL> compute sum label 'Total: ' of value on i_descr;
SQL> select itm.i_descr
2 , itm.i_size
3 , itm.i_price
4 , itm.i_qoh
5 , sum(i_price*i_qoh) Value
6 from inventories inv
7 join items itm on (inv.i_num = itm.i_num)
8 group by itm.i_num
9 , itm.i_descr
10 , itm.i_size
11 , itm.i_price
12 , itm.i_qoh
13 order by i_descr, i_price;
I_DESCR I_S I_PRICE I_QOH VALUE
---------- --- ---------- ------ ------
Item_1 S 123 25 3075
L 424 12 5088
********** ------
Total: 8163
Item_4 L 45 54 2430
S 78 54 4212
********** ------
Total: 6642
Item_5 S 123 22 2706
L 127 65 8255
********** ------
Total: 10961
6 rows selected.
答案 3 :(得分:1)
请勿使用嵌套查找,请使用加入。数据库非常擅长连接,并且集合操作的性能比逐行处理要好得多。
此外,在大多数情况下,您不需要声明游标和变量。使用游标循环让Oracle为您做繁重的工作。
set serveroutput on
DECLARE
totalvalue number(8,2);
BEGIN
totalvAlue:=0;
FOR inv_itm_rec IN (
SELECT itm.itemid
, itm.itemdesc
, inv.itemsize
, inv.color
,inv.curr_price
,inv.qoh
,inv.curr_price*inv.qoh as Total
FROM inventory inv
JOIN item itm
ON itm.itemid=inv.itemid
)
LOOP
DBMS_OUTPUT.PUT_LINE('ItemId: ' || inv_itm_rec.itemid);
DBMS_OUTPUT.PUT_LINE('Description: ' || inv_itm_rec.itemdesc);
DBMS_OUTPUT.PUT_LINE('Size: ' || inv_itm_rec.itemsize);
DBMS_OUTPUT.PUT_LINE('Color: ' || inv_itm_rec.color);
DBMS_OUTPUT.PUT_LINE('Price: ' || inv_itm_rec.curr_price);
DBMS_OUTPUT.PUT_LINE('QOH: ' || inv_itm_rec.qoh);
DBMS_OUTPUT.PUT_LINE('Value: ' || inv_itm_rec.total);
TotalValue:=TotalValue + inv_itm_rec.total;
END LOOP;
DBMS_OUTPUT.PUT_LINE('TOTAL VALUE: ' || TotalValue);
END;
注意,此解决方案假定evry ITEM确实具有匹配的INVENTORY记录。如果数据模型允许其他任何情况,那将是一个朗姆酒旧仓库应用程序。