Oracle存储过程总结(一、基本应用)

本文引自Squirrel的专栏：http://blog.csdn.net/squirrelrao/archive/2008/07/11/2639571.aspx

1、创建存储过程
create or replace procedure test(var_name_1 in type,var_name_2 out type) as
--声明变量(变量名 变量类型)
begin
--存储过程的执行体
end test;
打印出输入的时间信息
E.g:
create or replace procedure test(workDate in Date) is
begin
dbms_output.putline('The input date is:'||to_date(workDate,'yyyy-mm-dd'));
end test;
2、变量赋值

变量名 := 值;

E.g：

create or replace procedure test(workDate in Date) is

x number(4,2);

begin

x := 1;

end test;

3、判断语句:

if 比较式 then begin end; end if;

E.g

create or replace procedure test(x in number) is

begin

        if x >0 then

         begin

        x := 0 - x;

        end;

    end if;

    if x = 0 then

       begin

        x: = 1;

    end;

    end if;

end test;

4、For 循环

For ... in ... LOOP

--执行语句

end LOOP;

(1)循环遍历游标

create or replace procedure test() as

Cursor cursor is select name from student; name varchar(20);

begin

for name in cursor LOOP

begin

dbms_output.putline(name); 

end;

end LOOP;

end test;

(2)循环遍历数组

create or replace procedure test(varArray in myPackage.TestArray) as

--(输入参数varArray 是自定义的数组类型，定义方式见标题6)

i number;

begin

i := 1;  --存储过程数组是起始位置是从1开始的，与java、C、C++等语言不同。因为在Oracle中本是没有数组的概念的，数组其实就是一张

--表(Table),每个数组元素就是表中的一个记录，所以遍历数组时就相当于从表中的第一条记录开始遍历

for i in 1..varArray.count LOOP     

dbms_output.putline('The No.'|| i || 'record in varArray is:'||varArray(i));  

end LOOP;

end test;

5、While 循环

while 条件语句 LOOP

begin

end;

end LOOP;

E.g

create or replace procedure test(i in number) as

begin

while i >  average := total / 5;

update student t set t.total=total and t.average = average where t.stdId = stdId;

end LOOP;

end;

end autocomputer;

--取得学生评论信息的存储过程

create or replace procedure get_comment(commentArray out myPackage.myArray) is

rs SYS_REFCURSOR；

record myPackage.stdInfo;

stdId varchar(30);

comment varchar(1);

i number;

begin

open rs for select stdId,comment from out_school

i := 1;

LOOP

fetch rs into stdId,comment; exit when rs%NOTFOUND;

record.stdId := stdId;

record.comment := comment;

recommentArray(i) := record;

i:=i + 1;

end LOOP;

end get_comment;

--定义数组类型myArray

create or replace package myPackage is begin

type stdInfo is record(stdId varchar(30),comment varchar(1));

type myArray is table of stdInfo index by binary_integer;

end myPackage;