(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 this case, Oracle Database must verify that the cursor containing the SQLstatement is in the library...
首先，我有一个返回ref_cursor的过程Oracle存储过程: CREATE OR REPLACE PROCEDURE getcity ( citycod...
(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...
This Oracle tutorial explains how to use the CURSOR FOR LOOP in Oracle with syntax and examples. The syntax for the CURSOR FOR Loop in Oracle / PLSQL is:
SPACE_FOR_TIMEis set to true, then a cursorcan be deallocated only when all application cursors associated with itsstatement are closed. In this case, Oracle Database need not verify thata cursor is in the cache because it cannot be deallocated while an applicationcursor associated with it is...
在Oracle数据库中,游标(Cursor)是一个数据库查询的结果集的引用。它允许你逐行地处理查询结果,而不是一次性地处理整个结果集。游标分为隐式游标和显式游标两种。 显式游标(Explicit Cursor) 显式游标是你在PL/SQL程序中明确声明和操作的游标。当你需要对查询结果进行更复杂的处理时,比如逐行处理查询结果或者需要获...
(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...
Finally, we can declare a cursor with a return clause. Syntax The syntax for a cursor with a return clause in Oracle/PLSQL is: CURSOR cursor_name RETURN field%ROWTYPE IS SELECT_statement; Example For example, you could define a cursor called c3 as below. CURSOR c3 RETURN courses_tbl%ROW...
Suggested Reading: Numeric For Loop In Oracle PL/SQLSyntax of Cursor For Loop. FOR loop_index IN cursor_name LOOP Statements… END LOOP; Example 1: Cursor For Loop With Simple Explicit Cursor SET SERVEROUTPUT ON; DECLARE CURSOR cur_RebellionRider IS SELECT first_name, last_name FROM ...
Only allows statements with identical text to share the same cursor. --只有SQL语句完全相同的情况下,才会使用相同的cursor,即执行计划。 Notes: (1)If you set CURSOR_SHARING, then Oracle recommends the FORCE setting unless you are in a DSS environment. FORCE limits the growth of child cursors tha...