[英]Wrong number or types of arguments in call to '||'
我們應該讀取一個文本文件,在處理異常的同時將該數據插入到表中。 這是我的函數的代碼:
set serveroutput ON;
CREATE OR replace FUNCTION Order_func(ldir VARCHAR2,
lfile VARCHAR2)
RETURN BOOLEAN
AS
result BOOLEAN;
f utl_file.file_type;
s VARCHAR2(200);
v_row VARCHAR2(2000);
v1 NUMBER;
v2 NUMBER;
v3 NUMBER;
v4 DATE;
v5 DATE;
v6 NUMBER;
v7 NUMBER;
v8 NUMBER;
v9 NUMBER;
customer_error EXCEPTION;
employee_error EXCEPTION;
item_error EXCEPTION;
customerids NUMBER;
employeeids NUMBER;
inventoryids NUMBER;
BEGIN
SELECT cno
INTO customerids
FROM customers;
SELECT employeeno
INTO employeeids
FROM employees;
SELECT itemno
INTO inventoryids
FROM inventory;
f := utl_file.Fopen(ldir, lfile, 'R');
LOOP
utl_file.Get_line(f, v_row);
v1 := Substr(v_row, 1, 4);
v2 := Substr(v_row, 6, 9);
v3 := Substr(v_row, 11, 12);
v4 := Substr(v_row, 15, 23);
v5 := Substr(v_row, 27, 35);
v6 := Substr(v_row, 38, 41);
v7 := Substr(v_row, 43);
v8 := Substr(v_row, 45, 48);
v9 := Substr(v_row, 50, 51);
IF v2 <> customerids THEN --checking customer id
RAISE customer_error;
ELSIF v3 <> employeeids THEN --checking employee id
RAISE employee_error;
ELSIF v6 <> inventoryids THEN --checking item1 id
RAISE item_error;
ELSIF v8 <> inventoryids THEN --checking item2 id
RAISE item_error;
ELSE
INSERT INTO transactions
(tid, orderno, cno, employeeno, received,
shipped, itemno1, quantity1, itemno2, quantity2)
VALUES (sequence_tid.NEXTVAL, v1, v2, v3, v4, v5,
v6, v7, v8, v9);
END IF;
END LOOP;
result := TRUE;
RETURN result;
EXCEPTION
WHEN customer_error THEN
dbms_output.Put_line('Customer not found in parent Customer table'); WHEN
employee_error THEN
dbms_output.Put_line('Employee not found in Employee table');
WHEN item_error THEN
dbms_output.Put_line('Item not found in inventory table'); WHEN OTHERS THEN
dbms_output.Put_line('Error code:'
|| SQLCODE
|| '. Error Message: '
|| SQLERRM);
utl_file.Fclose(f);
result := FALSE;
RETURN result;
END order_func;
這就是我調用函數的方式(但我認為這是錯誤的):
DECLARE
results boolean;
BEGIN
results := order_func('forQues','items.txt');
DBMS_OUTPUT.PUT_LINE('Result for ORDER_FUNC Function is: ' || results);
END;
這是我遇到的錯誤:
DECLARE
results boolean;
BEGIN
results := order_func('forQues','items.txt');
DBMS_OUTPUT.PUT_LINE('Result for ORDER_FUNC Function is: ' || results);
END;
Error report -
ORA-06550: line 5, column 26:
PLS-00306: wrong number or types of arguments in call to '||'
ORA-06550: line 5, column 5:
PL/SQL: Statement ignored
06550. 00000 - "line %s, column %s:\n%s"
*Cause: Usually a PL/SQL compilation error.
*Action:
我試圖刪除 dbms_output 中的結果,這就是發生的事情:
DECLARE
results boolean;
BEGIN
results := order_func('forQues','items.txt');
DBMS_OUTPUT.PUT_LINE('Result for ORDER_FUNC Function is:');
END;
運行后我得到:
Error code:-1422. Error Message: ORA-01422: exact fetch returns more than requested number of rows
Result for ORDER_FUNC Function is:
PL/SQL procedure successfully completed.
請有人幫忙,如何解決這個問題?
除了已經指出的錯誤之外,您的函數至少還有一些問題。 我相信,最大的問題是您對Substring函數的誤解,尤其是第三個參數。 第三個參數可選地指示所需的長度而不是結束位置。 例如,變量 v5 被定義為日期,但值設置為“v5 := Substr(v_row, 27, 35);”。 你真的有一個 35 個字符長的日期嗎? 此外,當省略第三個參數時,結果值將從第二個參數擴展到字符串的末尾。 所以 v7 從位置 43 延伸到字符串的末尾。 V8、V9 分別是 48 位和 51 位的數字,每個字段都與后面的字段重疊。
另一個大問題是錯誤 NO_DATA_FOUND。 您有三個可能發生這種情況的地方(選擇)和 1 個可能發生的地方(utl_file.Get_line - 這就是 utl_file 表示文件結束的方式)。 按照結構,您無法知道是哪個引發了該錯誤。 下面我提出一種方法來解決這個問題。 我將這些元素中的每一個都分解為一個自己的程序。 我將子字符串問題留給您解決。
在此之前有點哲學。 名稱和分類很重要。 名稱應該描述代表什么,但 V1、V2 ... 沒有; 所以可能不是 v5,而是 v_shipped_dt。 同樣,應根據例程的目的來聲明過程與函數。 程序完成事情,功能得到事情。 似乎這里的目的是加載數據而不是返回布爾值。 所以我把它變成了一個過程(它通過一個 out 參數報告)。 (通常我什至不會這樣做。它運行成功並且不返回任何內容,或者如果失敗則引發異常。但這可能是風格。)
create or replace procedure load_order_file
( ldir varchar2
, lfile varchar2
, result out varchar2
)
as
customer_error exception;
employee_error exception;
item_error exception;
f utl_file.file_type;
v_row varchar2(2000);
v1 number;
v2 number;
v3 number;
v4 date;
v5 date;
v6 number;
v7 number;
v8 number;
v9 number;
EOF_Reached Boolean ;
-- procedure to handle all file processing
procedure load_order_buffer
is
begin
if f is null or not util_file.is_open(f)
then
f := utl_file.fopen(ldir, lfile, 'R');
EOF_Reached := False;
end if ;
utl_file.get_line(f, v_row);
exception
when no_data_found then
EOF_Reached := True;
util_file.fclose(f);
end load_order_buffer;
-- procedure to split file line into local variables
procedure parse_buffer
is
begin
v1 := substr(v_row, 1, 4);
v2 := substr(v_row, 6, 9);
v3 := substr(v_row, 11, 12);
v4 := substr(v_row, 15, 23);
v5 := substr(v_row, 27, 35);
v6 := substr(v_row, 38, 41);
v7 := substr(v_row, 43);
v8 := substr(v_row, 45, 48);
v9 := substr(v_row, 50, 51);
end parse_buffer;
-- procedures to validate customer, employee, and inventory
procedure validate_customer(cust_no_in number)
is
l_exists varchar2(1);
begin
select null
into l_exists
from customers
where cno = cust_no_in;
exception
when no_data_found then
raise customer_error;
end validate_customer;
procedure validate_employee(employee_no_in number)
is
l_exists varchar2(1);
begin
select null
into l_exists
from employees
where employeeno = employee_no_in;
exception
when no_data_found then
raise employee_error;
end validate_employee;
procedure validate_inventory(inventory_no_in number)
is
l_exists varchar2(1);
begin
select null
into l_exists
from inventory
where itemno = inventory_no_in;
exception
when no_data_found then
raise item_error;
end validate_inventory;
-- Main
begin
-- set up initial assumptions;
result := 'Failed';
EOF_Reached := False;
loop
load_order_buffer;
exit when EOF_Reached;
parse_buffer;
validate_customer(v2);
validate_employee(v3);
validate_inventory(v6);
validate_inventory(v8);
-- everything valid create transaction
insert into transactions
(tid, orderno, cno, employeeno, received,
shipped, itemno1, quantity1, itemno2, quantity2)
values (sequence_tid.nextval, v1, v2, v3, v4, v5,
v6, v7, v8, v9);
end loop;
result := 'Success';
exception
when customer_error then
dbms_output.put_line('Customer not found in parent Customer table');
when employee_error then
dbms_output.put_line('Employee not found in Employee table');
when item_error then
dbms_output.put_line('Item not found in inventory table');
when others then
dbms_output.put_line('Error code:'
|| sqlcode
|| '. Error Message: '
|| sqlerrm);
end load_order_file ;
/
這是一個測試驅動程序
declare
result varchar2(8);
begin
load_order_file('forQues','items.txt');
dbms_output.put_line('Load Order file terminated with ' || result);
if result <> 'Success'
then
rollback;
end if ;
end ;
由於您既未提供表 DDL 也未提供示例數據,因此未進行測試。 祝你好運。
錯誤ORA-01422: exact fetch returns more than requested number of rows
當您的查詢返回多行但您有一個只期望返回 1 行的INTO
子句時,會發生ORA-01422: exact fetch returns more than requested number of rows
。
例如,您的三個查詢:
select cno into customerids from customers;
select employeeno into employeeids from employees;
select itemno into inventoryids from inventory;
錯誤PLS-00306: wrong number or types of arguments in call to '||'
被拋出是因為您試圖將一個字符串與一個布爾值連接起來
DBMS_OUTPUT.PUT_LINE('Result for ORDER_FUNC Function is: ' || results);
這是不允許的。
ORA-01422
錯誤的可能修復:將您的SELECT
放入FOR
循環中,例如:
FOR c IN (
SELECT
cno
INTO customerids
FROM
customers
) LOOP
--do stuff, access column value like c.cno
END LOOP;
PLS-00306
錯誤的可能修復:將串聯更改為
DBMS_OUTPUT.PUT_LINE('Result for ORDER_FUNC Function is: ' || case when results then 'true' else 'false' end);
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