procedure close_cursor(c in out integer);关闭一个动态游标,参数为open_cursor所打开的游标; procedure parse(c in integer, statement in varchar2, language_flag in integer):对动态游标所提供的sql语句进行解析,参数C表示游标,statement为sql语句,language-flag为解析sql语句所用oracle版本,一般有V6,V7跟native...
2.省去了fetch,open,close 操作。for内部自动完成。 不易出错: 只有输出语句,不用再思考fetch,notfound/found,output之间的前后逻辑关系,傻瓜操作,出错都难! 在pl/sql developer软件中要用command窗口操作: 带参数的游标使用如下: vtmp 可以不声明--vtmp c%rowtype; (for循环中in cursorName即自动设置了vtmp...
('empno is:'||emp_record.empno||'-- emp name is:'||emp_record.ename||'-- dept is:'||emp_record.dname);ENDLOOP;IFemp_cursor%ISOPENTHENdbms_output.put_line('Now to close cursor!');CLOSEemp_cursor;ENDIF;END; 这个时候再执行,就会一直等待,等待对方释放资源。 结束...
Ref Cursors A cursor references a result set. The REF CURSOR allows you to pass a cursor reference from one PL/SQL program unit to another. In other words, it allows you to create a variable that will receive a cursor and enable access to its result set,but in this blog I am giving ...
Oracle的PL/SQL中FOR语句循环游标的奇幻之旅 简介:【4月更文挑战第19天】在Oracle PL/SQL中,FOR语句与游标结合,提供了一种简化数据遍历的高效方法。传统游标处理涉及多个步骤,而FOR循环游标自动处理细节,使代码更简洁、易读。通过示例展示了如何使用FOR循环游标遍历员工表并打印姓名和薪资,对比传统方式,FOR语句不仅...
cursorINTO student； EXIT WHENstudent_cursor%NOTFOUND; UPDATE students SET salary=student .salary*0.3 WHERE id=student.id; END LOOP; CLOSEstudent_cursor;END;方式二：DECLARE CURSOR student_cursor IS SELECT id, name, salaray FROM employers;BEGIN LOOP student INstudent_cursor UPDATE ...
1) PL/SQL cursor FOR LOOP example# The following example declares an explicit cursor and uses it in the cursorFOR LOOPstatement. DECLARECURSORc_productISSELECTproduct_name, list_priceFROMproductsORDERBYlist_priceDESC;BEGINFORr_productINc_productLOOPdbms_output.put_line( r_product.product_name ||...
FORindex_variableINcursor_name[value[,value]...]LOOP--游标数据处理代码ENDLOOP; index_variable为游标FOR循环语句隐含声明的索引变量,无需在DECLARE中声明,该变量为RECORD类型,其结构与游标查询语句返回的结构集合的结构相同。 在程序中可以通过引用该索引记录变量元素来读取所提取的游标数据,index_variable中各元素...
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:
pl/sql用for in和for select into循环遍历表 create or replace procedure test_procedure_job as v1 varchar2(50); v2 varchar2(50); v3 varchar2(50); begin for v1 in (select t.id from test_table t) loop select t.username,t.password into v2,v3 from sshtest t where t.id = v1.id;...