在工作过程中涉及到过有时要进行INFORMIX和ORACLE之间的移植，有时应用需要既支持INFORMIX数据库又要支持ORACLE数据库，如果应用程序涉及到存储过程的话，就需要既熟悉INFORMIX存储过程的写法，又需要熟悉ORACLE存储过程的写法。

笔者将在工作中总结的一些经验写出来与大家共享。

建立存储过程的语法:

一、Informix

create procedure proc_name( [….in_parameter_list])

returning out_para_list / out_result_set;

二、Oracle

create [or replace] procedure procedue_name

[ (arg1 [ {in | out | in out }] type

(argn [ {in | out | in out }] type,)]

{is | as} –代替DECLARE关键字

[ 变量定义区]

begin

end procedure_name;

三、几个简单的例子

1、没有参数也没有返回值

1）Informix

create procedure pNoParam()

begin

on exception

rollback work;

return;

end exception

begin work;

delete from t1;

delete from t2;

commit work;

end;

end procedure;

2）Oracle

create or replace procedure pNoParam

as

begin

delete from t1;

delete from t2;

commit;

exception

when others then

begin

rollback;

end;

end pNoParam;

2、有输入输出

往t1表中插入一条记录，返回值表示插入是否成功。

1）Informix

create procedure pNormalParam(f1 integer, f2 varchar(10))

returning integer;

begin

on exception

rollback work;

return -1;

end exception

begin work;

insert into t1 values(f1, f2);

commit work;

return 0;

2）Oracle

create or replace procedure pNormalParam(f1 number,

f2 varchar2, v_Result out number)

as

begin

insert into t1 values(f1,f2);

commit;

v_Result = 0;

return;

exception

when others then

begin

rollback;

v_Result := -1;

end;

end pNormalParam;

需要注意的是，在oracle存储过程中，参数是不能加上size的，比如f1，在t1表中该字段是number(10,0)，而这里只能写number，而不能写number(10,0)。

3、返回记录集

1）Informix

create procedure pReturnSet() returning integer, varchar(10);

define i integer;

define j varchar(10);

foreach

select f1, f2 into i, j from t1

return i, j with resume;

end foreach;

end procedure;

2）Oracle

create or replace package TestRefCursorPkg as type TestRefCursorTyp is ref cursor; procedure pReturnSet(RefCursor out TestRefCursorTyp); end TestRefCursorPkg;

create or replace package body TestRefCursorPkg as

procedure pReturnSet (RefCursor out TestRefCursorTyp)

as

localCursor TestRefCursorTyp;

begin

open localCursor for select f1, f2 from t1;

RefCursor := localCursor;

end pReturnSet;

end TestRefCursorPkg;

/

四、其他差异说明

1、错误捕捉

1）Informix

使用

on exception

end exception

2）Oracle

使用

exception

when others then

2、对游标的处理

1）Informix

create procedure pHasCursor()

define v_f1 integer；

begin

on exception

rollback work;

return;

end exception

begin work;

foreach curt1 with hold for

select f1 into v_f1 from t1 — 注意这里没有分号

if (v_f1 = 1) then

update t1 set f2 = ’one’ where current of curt1;

elif (v_f1 = 2) then

update t1 set f2 = ’two’ where current of curt1;

else

update t1 set f2 = ’others’ where current of curt1;

end if;

end foreach;

commit work;

end；

end procedure;

2）Oracle

create or replace procedure pHasCursor

as

v_f1 number(10,0);

cursor curt1 is

select f1 from t1 for update;

begin

open curt1;

loop

fetch curt1 into v_f1;

exit when curt1%notfound;

if (v_f1 = 1) then

update t1 set f2 = ’one’ where current of curt1;

elsif (v_f1 = 2) then

update t1 set f2 = ’two’ where current of curt1;

else

update t1 set f2 = ’others’ where current of curt1;

end if;

end loop;

commit;

return;

exception

when others then

begin

rollback;

end;

end pHasCursor;