Question

这是动态选择查询SP，如果值不为null，则包含在where子句中，否则不包括。

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;

我们如何为更新做同样的事情，意味着更新那些非空的列。

Answer 1

您真的想知道要更新的行（密钥），否则您将更新整个表。因此，您需要在表上使用每个行唯一的主键（我添加了一个名为storekey的列）。然后，您可以使用nvl函数仅更新非空值：

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;
/

在存储过程中动态更新

2 个答案: