How to select values if I know the fieldname in PL*SQL? [SOLVED]

There was a simple trick in SQL*PLUS:
DEFINE var='EMP_NUMBER';
SELECT &var FROM emp;
And the result was the same as:
SELECT emp_number FROM emp;
Does anybody know how to write this in PL*SQL procedure? I didn't find any similar things in forum... I have db8i and 10g.
m.

Thank's a lot! I found this usefull article on Metalink as well:
Subject: Dynamic SQL
Doc ID: Note:62592.1 Type: BULLETIN
Last Revision Date: 06-MAR-2007 Status: PUBLISHED

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Hi Roshni Shankar,
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<?xml version="1.0" encoding="UTF-8"?>

<xs:schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:qbl="http://10.0.1.233:8080/home/cpa/xsd/qbl.xsd" xmlns:xdb="http://xmlns.oracle.com/xdb" xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified" version="1.0" xdb:storeVarrayAsTable="true">
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Hi Mark,
Thank you for your reply and I really appreciate!
I tried the select statement you gave me but I got error:
SQL*Plus: Release 9.2.0.3.0 - Production on Fri Aug 1 09:11:03 2003
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production
With the Partitioning, Oracle Label Security, OLAP and Oracle Data Mining options
JServer Release 9.2.0.3.0 - Production
SQL> set long 10000;
SQL> set pagesize 10000
SQL> select * from myqbl;
SYS_NC_ROWINFO$
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<Transmission_Date>030531</Transmission_Date>
<QBL>
<QBL_Number>316180J2</QBL_Number>
<Priority>3</Priority>
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<Line_Item_Cube_Qualifier>E</Line_Item_Cube_Qualifier>
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<Line_Item_Cube_Qualifier>E</Line_Item_Cube_Qualifier>
</Line_Item_Cube_Info>
</Line_Item>
</QBL>
</QBL_Envelope>
SQL> select extractValue(value(q), '/QBL/QBL_Number'),
2 extractValue(value(q), '/QBL/Priority'),
3 extractValue(value(q), '/QBL/Date_Prepared'),
4 extractValue(value(n), '/Item_Name'),
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8 from MYQBL e,
9 table (xmlsequence(extract(value(e), '/QBL_Envelope/QBL'))) q,
10 table (xmlsequence(extract(value(q), '/QBL/Line_Item'))) l,
11 table (xmlsequence(extract(value(l), '/Line_Item/Item_Name'))) n;
select extractValue(value(q), '/QBL/QBL_Number'),
ERROR at line 1:
ORA-00904: "SYS_NT0jPUiVR5SS6VqgqEvU1LkQ=="."SYS_NC_ROWINFO$": invalid
identifier
SQL>
Do you have any idea about it?
Actually before I posted the message I had tried the same select statement and had got the same error.
Again, thank you very much and I really appreciate your help.
Mary Wu

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Is there any way to do this (I think in C this is done by argc and argv, but a string containing all the information (as you get it from the WebDb when something goes wrong) would be enough)?
Thx in advance,
Nomike aka Michael Postmann

Name of procedure or function can be retrieved using DBMS_UTILITY.FORMAT_CALL_STACK:
CREATE OR REPLACE FUNCTION fn_whoami (v_in varchar2)
RETURN varchar2
AS
v_stack varchar2(1000) DEFAULT DBMS_UTILITY.FORMAT_CALL_STACK;
v_job varchar2(500);
v_name varchar2(100);
BEGIN
v_job := SUBSTR(v_stack,INSTR(v_stack,'function'),256);
v_name := SUBSTR(v_job,1,INSTR(v_job,CHR(10))-1);
return v_name;
END fn_whoami;
select fn_whoami('1') from dual;
CREATE OR REPLACE PROCEDURE pr_whoami
AS
v_stack varchar2(1000) DEFAULT DBMS_UTILITY.FORMAT_CALL_STACK;
v_job varchar2(500);
v_name varchar2(100);
BEGIN
v_job := SUBSTR(v_stack,INSTR(v_stack,'procedure'),256);
v_name := SUBSTR(v_job,1,INSTR(v_job,CHR(10))-1);
dbms_output.put_line(v_name);
END pr_whoami;
exec pr_whoami;

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