运行 oracle 触发器中的多个插入和更新语句

Question

我有一个 oracle 触发器可以将数据插入另一个 table。如果我使用单个更新查询而不是它工作但是如果我使用多个命令如更新和插入它失败并出现错误。

ORA-04091: table ADMIN_SMS_HANDLER is mutating, trigger/function may not see it
ORA-06512: at "ADMIN_SMS_TRIG", line 16
ORA-04088: error during execution of trigger 'ADMIN_SMS_TRIG'

有效。

CREATE OR REPLACE TRIGGER ADMIN_SMS_TRIG AFTER
    INSERT ON ADMIN_SMS_HANDLER
    FOR EACH ROW
DECLARE BEGIN
    INSERT INTO SMS (
        SMSID,
        ANUMBER,
        BNUMBER,
        MSG,
        APP
    ) VALUES (
        SMSSEQ.NEXTVAL,
        :NEW.SMS_FROM,
        :NEW.SMS_TO,
        :NEW.SMS_TEXT,
        'APP'
    );
END;

但这不起作用

CREATE OR REPLACE TRIGGER ADMIN_SMS_TRIG AFTER
    INSERT ON ADMIN_SMS_HANDLER
    FOR EACH ROW
DECLARE BEGIN
    INSERT INTO SMS (
        SMSID,
        ANUMBER,
        BNUMBER,
        MSG,
        APP
    ) VALUES (
        SMSSEQ.NEXTVAL,
        :NEW.SMS_FROM,
        :NEW.SMS_TO,
        :NEW.SMS_TEXT,
        'app'
    );

    UPDATE ADMIN_SMS_HANDLER
    SET
        SENT_DATE = SYSDATE,
        SENT_STATUS = 1,
        UPDATED_BY = 'trigger',
        UPDATED_DATE = SYSDATE
    WHERE
        ID = :NEW.ID;
END;

Answer 1

该问题与多语句无关。问题是行级触发器（通常）无法引用定义它的 table。

假设目的是让触发器自动填充某些列，您可以通过直接在 :new 伪记录中设置值来实现，即

:new.sent_date := sysdate;
:new.sent_status := 1;

但是由于您要修改当前行中的数据，因此需要使用 before insert 触发器而不是 after insert 触发器。像

CREATE OR REPLACE TRIGGER ADMIN_SMS_TRIG 
    BEFORE INSERT ON ADMIN_SMS_HANDLER
    FOR EACH ROW
DECLARE 
BEGIN
    INSERT INTO SMS (
        SMSID,
        ANUMBER,
        BNUMBER,
        MSG,
        APP
    ) VALUES (
        SMSSEQ.NEXTVAL,
        :NEW.SMS_FROM,
        :NEW.SMS_TO,
        :NEW.SMS_TEXT,
        'app'
    );

    :new.SENT_DATE := SYSDATE;
    :new.SENT_STATUS := 1;
    :new.UPDATED_BY := 'trigger';
    :new.UPDATED_DATE := SYSDATE;
END;

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