Oracle/PLSQL: FOR Loop 循环语句

Oracle/PLSQL: FOR Loop:
http://www.techonthenet.com/oracle/loops/for_loop.php

Loops with PL/SQL：
http://www.adp-gmbh.ch/ora/plsql/loops.html


The syntax for the FOR Loop is:

Sql代码

1. FOR loop_counter IN [REVERSE] lowest_number..highest_number
2. LOOP
3. {.statements.}
4. END LOOP;

You would use a FOR Loop when you want to execute the loop body a fixed number of times.

Let's take a look at an example.

Sql代码

1. FOR Lcntr IN 1..20
2. LOOP
3. LCalc := Lcntr * 31;
4. END LOOP;

This example will loop 20 times. The counter will start at 1 and end at 20.

The FOR Loop can also loop in reverse. For example:

Sql代码

1. FOR Lcntr IN REVERSE 1..15
2. LOOP
3. LCalc := Lcntr * 31;
4. END LOOP;

This example will loop 15 times. The counter will start at 15 and end at 1. (loops backwards)

oracle学习--循环语句：

http://www.cnblogs.com/happyday56/archive/2007/06/22/793102.html

On Cursor FOR Loops:

http://www.oracle.com/technology/oramag/oracle/08-nov/o68plsql.html

A Example：

Sql代码

1. CREATE OR REPLACE
2. procedure TEST_p(eq_id varchar,eq_id_new varchar,etp_no number) is
3. v_eq_id varchar2(20) :=eq_id;
4. v_eq_id_new varchar2(20) := eq_id_new;
5. v_etp_no number:=etp_no;
6. begin
7. for vRows in (select AQD_SEQ_MD_ET_PROCEDURES.nextval as id,certify_yn,required_yn,tpr_no from AQD_MD_ET_PROCEDURES where rownum <5)
8. LOOP
9. dbms_output.put_line(vRows.id);
10. insert into test(id,col2,col3,col4) values(vRows.id,vRows.certify_yn,vRows.required_yn,vRows.tpr_no);
11. END LOOP;
12. end TEST_p;
14. create table TEst(
15. id number(38),
16. col2 varchar2(1),
17. col3 varchar2(1),
18. col4 number(38)
19. )