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用DBMS_DDL包重新编译PL/SQL对象

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Release: 2016-06-07 15:15:59
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ALTER_COMPILE过程 这个过程等价于如下语句 ALTER PROCEDURE|FUNCTION|PACKAGE [ .] COMPILE [BODY] 语法 DBMS_DDL.ALTER_COMPILE ( type VARCHAR2, schema VARCHAR2, name VARCHAR2); 参数: 现在,如果想重 编译 一个程序,Oracle首先会重 编译 被标识invali

ALTER_COMPILE过程

这个过程等价于如下语句

ALTER PROCEDURE|FUNCTION|PACKAGE [.] COMPILE [BODY]

语法

DBMS_DDL.ALTER_COMPILE (

type

VARCHAR2,

schema VARCHAR2,

name

VARCHAR2);

参数:

用DBMS_DDL包重新编译PL/SQL对象


现在,如果想重编译一个程序,Oracle首先会重编译被标识invalid的程序所依赖的所有对象.

例1:

编译MYUSER方案的ACCESS_RIGHTS过程:

DBMS_DDL.ALTER_COMPILE('PROCEDURE','MYUSER','ACCESS_RIGHTS');

例2:

差不多每个实例中,PL/SQL对象名称以大写方式存储,如果创建时指定一个双引号的对象名称,那么当编译时应指定同样的方式.

如果指定不正确,则会报以下的错误

SQL> dbms_ddl.alter_compile('PROCEDURE','MYUSER','access_rights');

BEGIN dbms_ddl.alter_compile('PROCEDURE','MYUSER','access_rights'); END;

*

ERROR at line 1:

ORA-20000: Unable to compile PROCEDURE "MYUSER"."access_rights",

insufficient privileges or does not exist

ORA-06512: at "SYS.DBMS_DDL", line 68

ORA-06512: at line 1

因此如果你创建如下的对象:

CREATE or REPLACE PROCEDURE "My_Object" IS

BEGIN

...

得使用:

DBMS_DDL.ALTER_COMPILE('PROCEDURE','MYUSER','My_Object');

也可以使用ALTER PROCEDURE COMPILE命令来编译对象,用DBMS_DDL包最大的优势在于可以在以后的程序或PL/SQL中编译,这将拥有完全的灵活性以创建强有力的使用价值(请参照如下例子)

例3:

这个例子将获得所有无效的对象并且重新编译

set termout on

set serverout on

DECLARE

cursor cur_invalid_objects is

select object_name, object_type from user_objects where status='INVALID';

rec_columns cur_invalid_objects%ROWTYPE;

err_status NUMERIC;

BEGIN

dbms_output.enable(10000);

open cur_invalid_objects;

loop

fetch cur_invalid_objects into rec_columns;

EXIT WHEN cur_invalid_objects%NOTFOUND;

dbms_output.put_line

('Recompiling ' || rec_columns.object_type || '

' || rec_columns.object_name);

dbms_ddl.alter_compile(rec_columns.object_type,NULL,rec_columns.object_name);

end loop;

close cur_invalid_objects;

EXCEPTION

When others then

begin

err_status := SQLCODE;

dbms_output.put_line(' Recompilation failed : ' || SQLERRM(err_status));

if ( cur_invalid_objects%ISOPEN) then

CLOSE cur_invalid_objects;

end if;

exception when others then

null;

end;

end;

/

总结:

ALTER_COMPILE可以代替手工而自动编译对象,查找那些无效的对象从而一个一个地编译.
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