pl/sql 中for和while循环([PL/SQL] 用For Loop 替代Cursor)

for循环：
[PL/SQL] 用For Loop 替代Cursor
http://www.itwenzhai.com/data/2006/0523/article_9377.htm 
http://blog.csdn.net/heyday/archive/2005/07/27/435804.aspx
CURSOR FOR Loop
     FOR  employee_rec in c1  ---employee_rec直接用，不用提前定义
     LOOP
     total_val := total_val + employee_rec.monthly_income;
     END LOOP;
     当使用CURSOR FOR Loop时，不用我手工open cursor close cursor
应用：
begin
         FOR emm IN ( SELECT ro_site, ns_site, product_line, wh_type
                      FROM eis_hq_invhl_mail_data
                     WHERE report_type = 'Detailed' )
        LOOP
        DBMS_OUTPUT.put_line( emm.product_line );
            eis_hq_invhl_pkg.make_mail_detailed_data
                                        ( p_ro_site =>            emm.ro_site,
                                          p_ns_site =>            emm.ns_site,
                                          p_product_line =>       emm.product_line,
                                          p_wh_type =>            emm.wh_type,
                                          p_current_day =>        to_date('2005-11-07','yyyy-MM-dd') );
        END LOOP;
end;
存储过程DIY2----游标与循环
http://blog.csdn.net/brave1/archive/2005/06/08/390160.aspx 

while循环：
WHILE( i <= CEIL( LENGTH( p_clob_data ) / 4000 ))
    LOOP
        v_clob_data := TRIM( SUBSTR( p_clob_data,
                                     i * 4000,
                                     4000 ));
        DBMS_OUTPUT.put_line( SUBSTR( v_clob_data,
                                      0,
                                      255 ));
      
        i := i + 1;
    END LOOP;