Question

Oracle 10g PL/SQL REF Cursor get Column Names Dynamically

Asked by: marbro

While looping through a cursor I need to loop through each column without knowing the column name.  For instance

This works:
LOOP
 FETCH MVAR_cursor into MVAR_record;
 EXIT WHEN MVAR_cursor%NOTFOUND;
    MVAR_record.COLUMNNAME1;
     MVAR_record.COLUMNNAME2;
 END LOOP;
CLOSE MVAR_cursor;

Since I won't know the column name,  I need something like this:
LOOP
 FETCH MVAR_cursor into MVAR_record;
 EXIT WHEN MVAR_cursor%NOTFOUND;
   i := i+1;
    MVAR_record.column(i);
 END LOOP;
CLOSE MVAR_cursor;

thx

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Asked On
2007-06-11 at 11:54:14ID22626717
Tags

oracle

,

cursor

,

column

,

get

,

name

Topics

Databases Miscellaneous

,

PL / SQL

,

Oracle Database

Participating Experts
3
Points
500
Comments
5

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Answers

 

by: SJT2003APosted on 2007-06-11 at 13:19:42ID: 19261452

As a quick one I would suggest to check the DBMS_SQL package provided by ORACLE.

May be the DBMS_SQL package would be helpful to achieve your goal.
It offers DESCRIBE functionality list out the columns stored in a REF CURSOR and enables you to program accordingly.
Check the following example (extract from OTN):



This can be used as a substitute to the SQL*Plus DESCRIBE call by using a SELECT * query on the table that you want to describe.

declare
  c number;
  d number;
  col_cnt integer;
  f boolean;
  rec_tab dbms_sql.desc_tab;
  col_num number;
  procedure print_rec(rec in dbms_sql.desc_rec) is
  begin
    dbms_output.new_line;
    dbms_output.put_line('col_type            =    '
                         || rec.col_type);
    dbms_output.put_line('col_maxlen          =    '
                         || rec.col_max_len);
    dbms_output.put_line('col_name            =    '
                         || rec.col_name);
    dbms_output.put_line('col_name_len        =    '
                         || rec.col_name_len);
    dbms_output.put_line('col_schema_name     =    '
                         || rec.col_schema_name);
    dbms_output.put_line('col_schema_name_len =    '
                         || rec.col_schema_name_len);
    dbms_output.put_line('col_precision       =    '
                         || rec.col_precision);
    dbms_output.put_line('col_scale           =    '
                         || rec.col_scale);
    dbms_output.put('col_null_ok         =    ');
    if (rec.col_null_ok) then
      dbms_output.put_line('true');
    else
      dbms_output.put_line('false');
    end if;
  end;
begin
  c := dbms_sql.open_cursor;

  dbms_sql.parse(c, 'select * from scott.bonus', dbms_sql);
 
  d := dbms_sql.execute(c);
 
  dbms_sql.describe_columns(c, col_cnt, rec_tab);

/*
 * Following loop could simply be for j in 1..col_cnt loop.
 * Here we are simply illustrating some of the PL/SQL table
 * features.
 */
  col_num := rec_tab.first;
  if (col_num is not null) then
    loop
      print_rec(rec_tab(col_num));
      col_num := rec_tab.next(col_num);
      exit when (col_num is null);
    end loop;
  end if;
 
  dbms_sql.close_cursor(c);
end;
/


And another option is using SYS_CONTEXT storing context/variables and retrieve later. Check it out.

Good luck :)

 

by: marbroPosted on 2007-06-11 at 14:40:23ID: 19262067

I checked out DBMS_SQL.DESCRIBE and I was able to get the column names.  But how do I get the values as well?  Basically I need Column Name/value pairs for each record.

I'll check out SYS_CONTEXT

thx

 

by: sujith80Posted on 2007-06-11 at 22:23:16ID: 19263806

See this code:
SQL> select * from tab1;

     EMPNO ENAME      JOB
---------- ---------- ---------
      7369 SMITH      CLERK
      7499 ALLEN      SALESMAN

declare
 l_cur number;
 l_stmt varchar2(2000);
 l_dtbl dbms_sql.desc_tab;
 l_cnt number;
 l_status number;
 l_val varchar2(200);
begin
 l_cur := dbms_sql.open_cursor;
 l_stmt := 'select * from tab1';
 dbms_sql.parse(l_cur,'select * from tab1',dbms_sql.native);
 dbms_sql.describe_columns(l_cur,l_cnt,l_dtbl);
 for i in 1..l_cnt loop
  dbms_sql.define_column(l_cur,i,l_val,30);
 end loop;
 l_status := dbms_sql.execute(l_cur);
 while ( dbms_sql.fetch_rows(l_cur) > 0 ) loop
 for i in 1..l_cnt loop
  dbms_sql.column_value(l_cur,i,l_val);
  dbms_output.put_line(l_dtbl(i).col_name||' --> '||l_val);
 end loop;
 end loop;
 dbms_sql.close_cursor(l_cur);
end;
/

 

by: tranz435Posted on 2007-06-12 at 08:58:30ID: 19267310

declare
stmt varchar2(2000) :=null;
begin
for col_names in (select COLUMN_NAME from all_tab_columns where table_Name = upper('TABLE_NAME') and owner = 'SCHEMA_NAME' and column_name like '%SOMETHING%' order by COLUMN_NAME)
loop
stmt := stmt||','||col_names.COLUMN_NAME;
end loop;
insert into temp select substr(stmt,2,length(stmt)) from dual;
commit;
end;

 

by: tranz435Posted on 2007-06-12 at 08:59:09ID: 19267319

I wrote an insert statement, but you can replace it with a dbms_output if you want to just display it on screen

20120131-EE-VQP-002

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