Oracle Database need not verify thata cursor is in the cache because it cannot be deallocated while an applicationcursor associated with it is open.
Oracle Database need not verify thata cursor is in the cache because it cannot be deallocated while an applicationcursor associated with it is open.
(1)If CURSOR_SPACE_FOR_TIMEis set to false (the default), then a cursor can be deallocated from the library cache regardless ofwhether application cursors associated with its SQL statement are open.In this case, Oracle Database must verify that the cursor containing the SQLstatement is in th...
Oracle Database need not verify thata cursor is in the cache because it cannot be deallocated while an applicationcursor associated with it is open.
Use the %ROWCOUNT cursor attribute to retrieve an exact number of rows . Use the %NOTFOUND cursor attribute to determine when to exit the loop . EXIT WHENemp_cursor%NOTFOUNDORemp_cursor%NOTFOUND IS NULL; FOR record_name IN cursor_name LOOP ...
Oracle internally manages the whole execution cycle of implicit cursors and reveals only the cursor’s information and statuses such asSQL%ROWCOUNT,SQL%ISOPEN,SQL%FOUND, andSQL%NOTFOUND. The implicit cursor is not elegant when the query returns zero or multiple rows which causeNO_DATA_FOUNDorTOO...
1.2、FOR循环游标：采用遍历方式，自动打开、提取和关闭游标。（能否利用%ROWCOUNT获得游标提取的行数？） DECLARE /*定义带参数游标*/ CURSORcur_para(idvarchar2)IS SELECTbooks_nameFROMbooksWHEREbooks_id=id; BGEIN /*调用带参数游标，并以FOR循环方式处理*/ FORcurINcur_para('0001')LOOP
%FOUND checks whether a fetch succeeded in bringing a record into a variable. Returns TRUE if the fetch succeeded, FALSE otherwise. %NOTFOUND reverse of %FOUND. Returns FALSE if the fetch succeeded, TRUE otherwise. %ISOPEN checks whether a cursor is open. %ROWCOUNT returns the number of rows...
Oracle SQL的cursor理解 在PL/SQL开发中,会涉及到很多cursor的处理操作,这个cursor通常被翻译成游标。游标又分成显式和隐式两类。使用updatedeleteinsert操作,都是隐式游标;而使用select操作,可能是隐式游标也可能是显示游标。 隐式游标中大写的"SQL"标识,如SQL%ROWCOUNT表示隐式游标有几行记录;显式游标由开发者自...
ORACLE中RECORD、VARRAY、TAB、IS REF CURSOR LE的使用及实例详解 create or replace procedure PRO_RECORD_ROW_TAB_EXAMPLE IS --记录一行二列的数据 type V_REC is RECORD( FACT_NO char(4), FACT_ODR_NO char(20) ); --对变量进行实例化