pl/sql 处理重复

Question

你好，当 table 中存在其他具有相同姓氏的工作人员时，我必须制作插入新行并执行回滚的程序。

我在网上和这里查过，但找不到具体信息。我必须使用异常 dup_val_on_index

create or replace PROCEDURE insert_date(
   p_id IN WORKERS.ID%TYPE,
   p_PESEL IN WORKERS.PESEL%TYPE,
   p_name IN WORKERS.NAME%TYPE,
   p_surname IN WORKERS.SURNAME%TYPE,
   p_date_birth IN WORKERS.DATE_BIRTH%TYPE,
   p_salary IN WORKERS.SALARY%TYPE)
IS
BEGIN

INSERT INTO WORKERS VALUES (p_id, p_PESEL,p_name,p_surname, p_date_birth,p_salary);

COMMIT;
EXCEPTION
   when DUP_VAL_ON_INDEX then
   dbms_output.put_line('DUP_VAL_ON_INDEX exception.');
    ROLLBACK;
END;

BEGIN
insert_date(5,92060111111,'wikta','dss',TO_DATE('2003/07/10',    'yyyy/mm/dd'),100);
END;

Answer 1

您只需要检查 table 中是否已经存在 SURNAME。如果不存在，那么您可以插入并提交该行。试试这个：

create PROCEDURE insert_date(
p_id IN WORKERS.ID%TYPE,
p_PESEL IN WORKERS.PESEL%TYPE,
p_name IN WORKERS.NAME%TYPE,
p_surname IN WORKERS.SURNAME%TYPE,
p_date_birth IN WORKERS.DATE_BIRTH%TYPE,
p_salary IN WORKERS.SALARY%TYPE)

IS 
  varTmp NUMBER:=0;
BEGIN
-- check here whether the surname already exist or not
SELECT decode((select max(t.d) from (SELECT 1 d FROM WORKERS WHERE SURNAME = p_surname) t),1, 2) INTO varTmp FROM dual;

-- insert
IF (varTmp <> 2) THEN
    INSERT INTO WORKERS VALUES (p_id, p_PESEL,p_name,p_surname, p_date_birth,p_salary);
 ELSE
    DBMS_OUTPUT.PUT_LINE('Row can not be inserted.');
END IF;
 COMMIT;
EXCEPTION
 when DUP_VAL_ON_INDEX then
 dbms_output.put_line('DUP_VAL_ON_INDEX exception.');
  ROLLBACK;
END;

Answer 2

我试过你的代码，没有问题，它按预期工作（执行两次时属于 dup_val_on_index 异常）

我能想到的唯一错误是您没有定义主键或唯一键。所以你的 table 定义应该是例如像这样

create table workers 
 (  id number,
    PESEL number,
    name varchar2(20),
    surname varchar2(20),
    date_birth date,
    salary number,
  CONSTRAINT worker_pk PRIMARY KEY (id)
)

或者您可以将主键或唯一键添加到现有列

alter table workers
  add constraint PK_workers primary key (ID);

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