从 Oracle 存储过程返回输出参数

Question

我正在尝试设置输出参数thirdPartyId 的值，但在set thirdPartyId 语句中出现missing or invalid option 错误消息。

PROCEDURE usp_insert_user(  userType VARCHAR2,
                                logonId VARCHAR2,
                                title VARCHAR2,
                                firstName VARCHAR2,
                                middleName VARCHAR2,
                                lastName VARCHAR2,
                                comments VARCHAR2,
                                thirdPartyId OUT number) AS
      begin
        set thirdPartyId := select max(third_party_id) + 1 from third_party_user_temp;
        insert into THIRD_PARTY_USER_TEMP
            (Third_party_id,web_logon_id,prsn_type_cd,prsn_title_nm,
            prsn_first_nm,prsn_mdl_nm,prsn_last_nm,addtnl_third_party_txt)
            VALUES(thirdPartyId,logonId,upper(userType),title,
            firstName,middleName,lastName,comments)
        ;
    end usp_insert_user;

这样做的正确方法是什么？

谢谢！

更新：这样更安全吗？

insert into THIRD_PARTY_USER_TEMP
        (Third_party_id,web_logon_id,prsn_type_cd,prsn_title_nm,
        prsn_first_nm,prsn_mdl_nm,prsn_last_nm,addtnl_third_party_txt)
        VALUES((select max(third_party_id) + 1 from third_party_user_temp),logonId,upper(userType),title,
        firstName,middleName,lastName,comments)
        returning third_party_id into thirdPartyId

Answer 1

你可以这样做：

select max(third_party_id) + 1 into thirdPartyId from third_party_user_temp;

如果两个人可以同时运行它，这可能会出现争用问题 - 两者都可能最终得到相同的新 thirdPartyId。您可以查看序列来避免这种情况。

---

如果您定义了一个名为thirdPartyIdSeq 的序列，您可以这样做：

PROCEDURE usp_insert_user(  userType VARCHAR2,
                                logonId VARCHAR2,
                                title VARCHAR2,
                                firstName VARCHAR2,
                                middleName VARCHAR2,
                                lastName VARCHAR2,
                                comments VARCHAR2,
                                thirdPartyId OUT number) AS
      begin
        insert into THIRD_PARTY_USER_TEMP
            (Third_party_id,web_logon_id,prsn_type_cd,prsn_title_nm,
            prsn_first_nm,prsn_mdl_nm,prsn_last_nm,addtnl_third_party_txt)
            VALUES(third_party_id_seq.nextval,logonId,upper(userType),title,
            firstName,middleName,lastName,comments)
        returning third_party_id into thirdPartyId;
    end usp_insert_user;

这使用序列生成下一个 ID，returning 子句填充您的 OUT 参数。

您还可以避免该过程并在触发器中生成 ID，再次使用该序列。这种方法的例子很多，尤其是在这个网站上。

CREATE OR REPLACE TRIGGER third_party_user_temp_bi
BEFORE INSERT ON third_party_user_temp
FOR EACH ROW
BEGIN
    SELECT thirdPartyIdSeq.NEXTVAL
    INTO   :new.third_party_id
    FROM   dual;
END;
/

然后您的插入不需要指定要使用的 ID。