Oracle DB 更新语句，相同的值不同的目标行

Question

在我的程序中，我想插入 table 订单并更新 table 销售员

create or replace PROCEDURE place_order(
    PURCH_AMT   in varchar,
    CUSTOMER_ID in varchar,
    SALESMAN_ID in varchar
) AS
order_id varchar(50);
ORD_DATE varchar(50);

--INICIO
begin
    --VARS
        order_id := sys_guid();
        ORD_DATE := SYSDATE;
    --INSERT da order
        insert into ORDERS values (order_id, PURCH_AMT, ORD_DATE, CUSTOMER_ID, SALESMAN_ID);
        DBMS_OUTPUT.put_line('out put with variable salesman_id');
        DBMS_OUTPUT.put_line(SALESMAN_ID);
    --UPDATE sales do salesman
        update salesman
        set n_sales = n_sales + 1
        where salesman.SALESMAN_ID = SALESMAN_ID;
    --COMMIT
        COMMIT;
    EXCEPTION
        WHEN OTHERS THEN
            ROLLBACK;
            RAISE;     
        
end place_order;

但是当我运行它更新所有的销售员

当我更改程序更新并对销售员 ID 进行硬编码时，它起作用了

DBMS_OUTPUT.put_line('output with harcoded 5001');
        DBMS_OUTPUT.put_line(5001);
    --UPDATE sales do salesman
        update salesman
        set n_sales = n_sales + 1
        where salesman.SALESMAN_ID = '5001';

Answer 1

这是错误的：

create or replace PROCEDURE place_order(
    PURCH_AMT   in varchar,
    CUSTOMER_ID in varchar,
    SALESMAN_ID in varchar          --> this
) AS
<snip>
    --UPDATE sales do salesman
        update salesman
        set n_sales = n_sales + 1
        where salesman.SALESMAN_ID = SALESMAN_ID;
                       -----------   -----------
                         this

Never 名称参数与列名称相同。正如您所做的那样，where 子句被评估为类似于 where 1 = 1 的内容，这意味着 更新 table.

中的所有行

重命名参数；通常，我们前缀他们，例如

create or replace PROCEDURE place_order(
    PAR_PURCH_AMT   in varchar2,
    PAR_CUSTOMER_ID in varchar2,
    PAR_SALESMAN_ID in varchar2
) AS
<snip>
    --UPDATE sales do salesman
        update salesman
        set n_sales = n_sales + 1
        where salesman.SALESMAN_ID = PAR_SALESMAN_ID;

（此外，Oracle 建议我们使用 varchar2 而不是 varchar）

Oracle DB 更新语句，相同的值不同的目标行

Oracle DB Update statement, same value different targeted rows

sql

database

oracle

oracle-sqldeveloper

sql-update