在存儲過程中動態更新

Question

這是動態選擇查詢SP，如果該值不爲空，它將包含在where子句中否則不包含。

create or replace PROCEDURE GET_STORE(
     _storeId IN NUMBER DEFAULT NULL, 
     _storename IN VARCHAR2 DEFAULT NULL, 
     _return_Result OUT SYS_REFCURSOR 
    )AS 
     BEGIN 
     OPEN _return_Result FOR 
     SELECT S.* FROM STORE S 
     WHERE (NVL(_storeId,0) =0 OR S.STOREID=_storeId) 
      AND (_storename IS NULL OR S.STORENAME=_storename); 
END RD_CITY; 

我們如何才能做到同樣的事情更新，意味着更新那些非空的列。

Answer 1

你真的想知道你正在更新哪一行（鍵），否則你會更新整個表。所以你需要在表格上爲每行唯一的一個主鍵（我添加了一個名爲storekey的列）。然後你可以使用NVL函數來不爲空只更新值：

create or replace PROCEDURE UPDATE_STORE(
     pstorekey IN NUMBER, 
     pstoreid IN VARCHAR2 DEFAULT NULL, 
     pstorename IN VARCHAR2 DEFAULT NULL 
    ) 
AS 
BEGIN 

    update store 
    set storeid = nvl(pstoreid,storeid), 
    storename = nvl(pstorename,storename) 
    where storekey = pstorekey; 

    commit; 

END update_store; 

Answer 2

CREATE OR REPLACE PROCEDURE GET_STORE(
    _storeId  IN STORE.STOREID%TYPE DEFAULT NULL, 
    _storename  IN STORE.STORENAME%TYPE DEFAULT NULL, 
    _return_Result OUT SYS_REFCURSOR 
) 
AS 
BEGIN 
    OPEN _return_Result FOR 
    SELECT * 
    FROM STORE 
    WHERE (_storeId IS NULL OR STOREID=_storeId) 
    AND (_storename IS NULL OR STORENAME=_storename); 
END GET_STORE; 
/

CREATE OR REPLACE PROCEDURE UPDATE_STORE(
    _storeId  IN STORE.STOREID%TYPE DEFAULT NULL, 
    _storename  IN STORE.STORENAME%TYPE DEFAULT NULL, 
    _othervalue IN STORE.OTHERVALUE%TYPE 
) 
AS 
BEGIN 
    UPDATE store 
    SET othervalue = _othervalue 
    WHERE (_storeId IS NULL OR STOREID=_storeId) 
    AND (_storename IS NULL OR STORENAME=_storename); 
END UPDATE_STORE; 
/