Question

我有一个 oracle 触发器可以将数据插入到另一个表中。如果我使用单个更新查询，那么它会起作用，但是如果我使用多个命令（例如更新和插入），它会因错误跟随错误而失败。

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'

这行得通。

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

该问题与多个语句无关。问题是行级触发器（通常）无法引用定义它的表。

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;

但由于您想修改当前行中的数据，您需要使用 before insert 触发器而不是 after insert 触发器。类似的东西

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;

在 oracle 触发器中运行多个插入和更新语句

1 个答案: