在觸發器中循環

Question

我試圖實現一個觸發器來搜索表上的值，並且，如果它檢查條件然後插入另一個表中。該觸發看起來是這樣的：

TRIGGER DISTANCIA 
AFTER INSERT ON OBSERVACION FOR EACH ROW 
DECLARE 
importe_multa NUMBER (3,0); 
BEGIN 
FOR ROW IN (SELECT fecha_foto, hora_foto, pto_km_radar, sentido_radar, carretera_foto FROM OBSERVACION) LOOP 
    IF((ROW.fecha_foto = :NEW.fecha_foto) 
    AND 
    (ROW.carretera_foto= :NEW.carretera_foto) 
    AND 
    (ROW.pto_km_radar=:NEW.pto_km_radar) 
    AND 
    (ROW.sentido_radar=:NEW.sentido_radar)) 
    THEN 

    IF(ROW.hora_foto<:NEW.hora_foto-3,6/86400) 
    THEN 
    importe_multa:= (:NEW.hora_foto - ROW.hora_foto - 3,6/86400)*100; 
    END IF; 
    IF(:NEW.hora_foto < ROW.hora_foto-3,6/86400) 
    THEN 
    importe_multa:= (ROW.hora_foto - :NEW.hora_foto - 3,6/86400)*100; 
    END IF; 

    IF(importe_multa IS NOT NULL) 
    THEN 
    --Introducimos el valor en el campo. 
    INSERT INTO SANCION(importe, fecha_foto, hora_foto, coche, tipo) 
    VALUES 
    (importe_multa, :NEW.fecha_foto, :NEW.hora_foto, :NEW.coche, '2'); 
    END IF; 
    END IF; 
END LOOP; 
END; 

當我試圖編譯的SQLDeveloper軟件引發此錯誤：

ORA-01008: Not all variables bound. 

難道我引用在觀察右邊的變量？

Answer 1

1）OBSERVACION上的行級觸發器不能再查詢OBSERVACION表。如果你這樣做，你會得到一個突變的觸發錯誤。所以這種方法從根本上是有問題的。

2）我想你會得到編譯錯誤，因爲你需要用小數點表示十進制數字作爲分隔符，而不是逗號。逗號用於將參數分隔到一個函數。

3）如果你的確實是想要在觸發器中實現這種邏輯，而不是將它放在真正屬於它的過程中，那麼需要用一系列觸發器解決突變觸發器錯誤。這會讓你的代碼更加複雜，難以遵循，而且更難調試。但它可以讓你只用觸發器來做到這一點。

CREATE OR REPLACE PACKAGE pkg_new_rows 
AS 
    TYPE typ_new_row_array 
    IS TABLE OF rowid; 
    g_new_rows typ_new_row_array; 
END; 

CREATE OR REPLACE TRIGGER trg_before_statement 
    BEFORE INSERT ON OBSERVACION 
DECLARE 
BEGIN 
    pkg_new_rows.g_new_rows := new pkg_new_rows.typ_new_row_array(); 
END; 

CREATE OR REPLACE TRIGGER trg_before_row 
    BEFORE INSERT ON observacion 
    FOR EACH ROW 
DECLARE 
BEGIN 
    pkg_new_rows.g_new_rows.extend; 
    pkg_new_rows.g_new_rows(pkg_new_rows.g_new_rows.count) := :new.rowid; 
END; 

CREATE OR REPLACE TRIGGER trg_after_statement 
    AFTER INSERT ON observacion 
DECLARE 
    l_row observacion%rowtype; 
BEGIN 
    FOR i IN 1 .. pkg_new_rows.g_new_rows.count 
    LOOP 
    SELECT * 
     INTO l_row 
     FROM observacion 
    WHERE rowid := pkg_new_rows.g_new_rows(i); 

    <<implement your logic by querying the other rows of the OBSERVACION table 
    and comparing that to the data in the l_row record>> 
    END LOOP; 
END;