如何使用oracle从存储的函数中检索多行

时间:2012-12-12 17:05:35

标签: oracle plsql

我正在尝试在oracle中创建一个返回多行的存储函数。

我的问题与this one非常相似,只是我想要提取select *查询

简而言之,我想创建一个返回此查询结果的函数

select * from t_email_queue

我试过的是:

create or replace
PACKAGE email_queue AS 

  type t_email_queue_type is table of T_EMAIL_QUEUE%ROWTYPE;  

  FUNCTION lock_and_get return t_email_queue_type;

END email_queue;

create or replace
PACKAGE BODY email_queue AS 

    FUNCTION lock_and_get RETURN t_email_queue_type AS 
      queue_obj t_email_queue_type;

      cursor c (lockid in varchar2) is select * from t_email_queue where lockedby = lockid;
      lockid varchar2(100) := 'alf';
    BEGIN

      OPEN c(lockid);
      FETCH c bulk collect INTO queue_obj;

      return queue_obj;

    END lock_and_get;

END email_queue;

包编译得很好,但是当我尝试使用此查询调用它时

select * from table(email_queue.lock_and_get);

Oracle抛出以下错误

ORA-00902: invalid datatype
00902. 00000 -  "invalid datatype"
*Cause:    
*Action:
Error at Line: 1 Column: 20

我认为Oracle希望我在架构级别创建我的返回类型,但是当我尝试

create type t_email_queue_type is table of T_EMAIL_QUEUE%ROWTYPE;  

Oracle抱怨

Type IMAIL.T_EMAIL_QUEUE_TYPE@imail dev
Error(1): PL/SQL: Compilation unit analysis terminated
Error(2,37): PLS-00329: schema-level type has illegal reference to IMAIL.T_EMAIL_QUEUE

有人能指出我正确的方向吗?我在这里缺少什么?

感谢阅读!

3 个答案:

答案 0 :(得分:4)

使用SQL类型,你不能做%ROWTYPE,你必须键入每一列以匹配表*。

* sys.anydataset放在一边。但是沿着这条路走下来会有更复杂的编码。

e.g。如果你的表是

create table foo (id number, cola varchar2(1));

然后

create type email_queue_type is object (id number, cola varchar2(1));
/
create type t_email_queue_type as table of email_queue_type;
/

并使用该表email_queue_type_tab作为函数的输出。

但我建议使用流水线功能,因为您当前的代码不可扩展。

例如:

SQL> create table foo (id number, cola varchar2(1));

Table created.

SQL>
SQL> create type email_queue_type is object (id number, cola varchar2(1));
  2  /

Type created.

SQL> create type t_email_queue_type as table of email_queue_type;
  2  /

Type created.

SQL> insert into foo select rownum, 'a' from dual connect by level <= 10;

10 rows created.

SQL>
SQL> create or replace PACKAGE email_queue AS
  2
  3
  4    FUNCTION lock_and_get return t_email_queue_type pipelined;
  5
  6  END email_queue;
  7  /

Package created.

SQL> create or replace PACKAGE BODY email_queue AS
  2
  3      FUNCTION lock_and_get RETURN t_email_queue_type pipelined AS
  4        queue_obj t_email_queue_type;
  5
  6      BEGIN
  7
  8       for r_row in (select * from foo)
  9              loop
 10                pipe row(email_queue_type(r_row.id, r_row.cola));
 11              end loop;
 12
 13      END lock_and_get;
 14
 15  END email_queue;
 16  /

Package body created.

SQL> select * from table(email_queue.lock_and_get());

        ID C
---------- -
         1 a
         2 a
         3 a
         4 a
         5 a
         6 a
         7 a
         8 a
         9 a
        10 a

10 rows selected.

SQL>

答案 1 :(得分:4)

如果您不是特别热衷于使用SQL类型,则可以使用sys_refcursor代替:

create or replace package email_queue as 
    function lock_and_get return sys_refcursor;
end email_queue;
/

create or replace package body email_queue as 
    function lock_and_get return sys_refcursor AS 
        c sys_refcursor;
        lockid varchar2(100) := 'alf';
    begin
        open c for
            select * from t_email_queue
            where lockedby = lockid;

         return c;
    end lock_and_get;
end email_queue;
/

从SQL * Plus中你可以称之为:

var cur refcursor;
exec :cur := email_queue.lock_and_get;
print cur

并且exec是简单匿名块的简写,您也可以从其他PL / SQL对象调用。但是你不能做的是:

select * from table(email_queue.lock_and_get);

我不熟悉从PHP调用函数,但是从Java可以直接使用它作为可调用语句的返回,因此根本不需要select * from table()构造。我不知道你是否可以在PHP调用中执行一个匿名块,比如begin $cur = email_queue.lock_and_get; end;,并且$cur作为你的结果集然后可以迭代通过?

我意识到这不是一个完整的答案,因为PHP方面过于模糊,但可能会给你一些想法。

答案 2 :(得分:1)

如果您正在使用PHP,并且要访问oracle存储函数。您可以使用类似这样的

//Your connection details
$conn = oci_connect($username, $password, '(DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))(CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = XE)))' );

/* Your query string; you can use oci_bind_by_name to bind parameters or just pass the variable in it*/

$query = "begin :cur := functionName('".$param1."','".$param2."','".$param3."'); end;";
$stid = oci_parse($conn, $query); 
$OUTPUT_CUR = oci_new_cursor($conn);
oci_bind_by_name($stid, ':cur', $OUTPUT_CUR, -1, OCI_B_CURSOR);
oci_execute($stid); 
oci_execute($OUTPUT_CUR);
oci_fetch_all($OUTPUT_CUR, $res);

// To get your result  
var_dump($res);

我希望这会有所帮助。