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:
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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