Example2:检验游标是否打开,如果打开显示提取行数 DECLARE CURSOR emp_cursor IS SELECT empno,ename,job FROM emp; v_empno emp.empno%TYPE; v_name emp.ename%TYPE; v_job emp.job%TYPE; BEGIN OPEN emp_cursor; LOOP FETCH emp_cursor INTO v_empno,v_name,v_job; EXIT WHEN emp_cursor%NOTFOUND; E...
Oracle Database need not verify thata cursor is in the cache because it cannot be deallocated while an applicationcursor associated with it is open.
一个session cursor只能对应一个shared cursor,而一个shared cursor却可能同时对应多个session cursor。 当某个session cursor和其对应的shared cursor建立关联后,如果把cursor_space_for_time调成true,当一个session cursor处理完一条sql后,它就不会被destroy,Oracle会把其cache起来(我们称之为soft closed session curso...
Oracle Database need not verify thata cursor is in the cache because it cannot be deallocated while an applicationcursor associated with it is open.
这里严格按照显示游标的书写规则:DECLARE emp_cursor定义游标OPEN emp_cursor打开游标FETCH emp_cursor INTO...提取数据CLOSE emp_cursor关闭游标,因为提取出来的数据属于多行,所以通过loop循环打印即可。 Example2:检验游标是否打开,如果打开显示提取行数 DECLARE ...
In this example, an implicit cursor FOR LOOP statement prints the last name and job ID of every clerk whose manager has an ID greater than 120. BEGINFORitemIN(SELECTlast_name,job_idFROMemployeesWHEREjob_idLIKE'%CLERK%'ANDmanager_id>120ORDERBYlast_name)LOOPDBMS_OUTPUT.PUT_LINE('Name = '...
Declaring a cursor without any parameters is the simplest cursor. Let's take a closer look. Syntax The syntax for a cursor without parameters in Oracle/PLSQL is: CURSOR cursor_name IS SELECT_statement; Example For example, you could define a cursor called c1 as below. ...
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...
A partial update may be performed only with Cursor.putCurrent. A null or partial DatabaseEntry output parameter may also be used in other cases, for example, to retrieve a partial key item. However, in practice this has limited value since the entire key is usually needed by the ...
1、ORACLE SID查看设置 查看SID、用户名 $ env|grep SID 、select * from v$instance、select instance_name,host_name from v$instance; 查看数据库所有用户及用户状态: SQL> select usernames,account_status from dba_users; 设置SID $ export ORACLE_SID=hisvhfs ...