You would use aCURSOR FOR Loopwhen you want to fetch and process every record in a cursor. TheCURSOR FOR Loopwill terminate when all of the records in the cursor have been fetched. 译:当你每次想通过cursor来对每条记录进行取及操作时,就可以使用CURSOR FOR Loop。当cursor中所有的记录都取后,CUR...
domainNamevarchar2(50) :='';--存储每个域下的网元类型cursormoTypeNames(domainVARCHAR2)ISselectt1.modelnamefrompm4h_mo.mdl_resmodel t1,pm4h_mo.mdl_domain t2wheret2.domainname=domainandt1.domainid=t2.domainid; moTypeNamevarchar2(500) :='';--拼接sql临时变量v_sqlvarchar2(500) :='';--...
Introduction to PL/SQL cursor FOR LOOP statement# The cursorFOR LOOPstatement is an elegant extension of the numericFOR LOOPstatement. The numericFOR LOOPexecutes the body of a loop once for every integer value in a specified range. Similarly, the cursorFOR LOOPexecutes the body of the loop ...
OPEN my_cursor; LOOP FETCH my_cursor INTO my_variable; EXIT WHEN my_cursor%NOTFOUND; -- 在这里对my_variable进行更新操作,例如: UPDATE dept SET dname = 'New Name' WHERE CURRENT OF my_cursor; END LOOP; CLOSE my_cursor; END; 通过以上内容,我们了解了PL/SQL中游标的概念、使用方法和最佳实践。
在PL/SQL中,游标可以用于遍历结果集并对每一行进行操作。游标通常与FOR循环一起使用。以下是一个示例,展示了如何在PL/SQL中使用游标和FOR循环: DECLARE CURSOR my_cursor IS SELECT column1, column2 FROM my_table; BEGIN FOR my_record IN my_cursor LOOP -- 在此处编写对每一行记录的操作 DBMS_OUTPUT.PUT...
1.定义光标:cursor Cursor c1 is select ename from emp; 2.打开光标:open Open c1;(打开光标执行查询) 3.使用循环语句开始循环光标 3.1可以使用loop循环 4.取一行光标的值:fetch Fetch c1 into pename; (取出一行数据到变量中) 5.循环退出条件是 ...
plsql中常见的loop循环 Integer for loop for i in 1..10 loop …. end loop; Implicit cursor loop for c in (select ) loop …. end loop; While loop i:=5; while i >10 loop i:=i+1; ... end loop; Basic loop i:=5; loop
update departmentssetdepartment_name=department_name;dbms_output.put_line('update '||sql%rowcount||' records');end; CURSOR FOR IN LOOP隐式游标 代码语言:javascript 代码运行次数:0 运行 AI代码解释 //例子1:无参数,使用循环,无须打开关闭游标create or replace procedureTESTis ...
plsql的循环有三种类型: • The simple or infinite loop • The FOR loop (numeric and cursor) • The WHILE loop The simple loop It’s called simple for a reason: it starts simply with the LOOP keyword and ends with the END LOOP statement. The loop will terminate if you execute an ...
FETCH cursor_name INTO var_name [, var_name] ...--执行SQL语句 --关闭游标 CLOSE cursor_name --使用hr/123456登录,employees表数据 --查询前10名员工的信息 方法一:隐式游标 BEGIN FOR c IN (SELECT * FROM employees WHERE ROWNUM<=10) LOOP DBMS_OUTPUT.PUT_LINE(c.employee_id||' '||c.fir...