Mega Code Archive
Use dbms_sql describe_columns
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SQL>
SQL> CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
2 ENAME VARCHAR2(10),
3 JOB VARCHAR2(9),
4 MGR NUMBER(4),
5 HIREDATE DATE,
6 SAL NUMBER(7, 2),
7 COMM NUMBER(7, 2),
8 DEPTNO NUMBER(2));
Table created.
SQL>
SQL> INSERT INTO EMP VALUES (7369, 'SMITH', 'CLERK', 7902, TO_DATE('17-DEC-1980', 'DD-MON-YYYY'), 800, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7499, 'ALLEN', 'SALESMAN', 7698, TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 1600, 300, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7521, 'WARD', 'SALESMAN', 7698, TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 1250, 500, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7566, 'JONES', 'MANAGER', 7839, TO_DATE('2-APR-1981', 'DD-MON-YYYY'), 2975, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7654, 'MARTIN', 'SALESMAN', 7698,TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250, 1400, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7698, 'BLAKE', 'MANAGER', 7839,TO_DATE('1-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7782, 'CLARK', 'MANAGER', 7839,TO_DATE('9-JUN-1981', 'DD-MON-YYYY'), 2450, NULL, 10);
1 row created.
SQL> INSERT INTO EMP VALUES (7788, 'SCOTT', 'ANALYST', 7566,TO_DATE('09-DEC-1982', 'DD-MON-YYYY'), 3000, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7839, 'KING', 'PRESIDENT', NULL,TO_DATE('17-NOV-1981', 'DD-MON-YYYY'), 5000, NULL, 10);
1 row created.
SQL> INSERT INTO EMP VALUES (7844, 'TURNER', 'SALESMAN', 7698,TO_DATE('8-SEP-1981', 'DD-MON-YYYY'), 1500, 0, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7876, 'ADAMS', 'CLERK', 7788,TO_DATE('12-JAN-1983', 'DD-MON-YYYY'), 1100, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7900, 'JAMES', 'CLERK', 7698,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 950, NULL, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7902, 'FORD', 'ANALYST', 7566,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 3000, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7934, 'MILLER', 'CLERK', 7782,TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10);
1 row created.
SQL>
SQL> set echo on
SQL>
SQL> create or replace procedure desc_query( p_query in varchar2 )
2 is
3 l_columnValue varchar2(4000);
4 l_status integer;
5 l_colCnt number default 0;
6 l_cnt number default 0;
7 l_line long;
8 l_descTbl dbms_sql.desc_tab;
9 l_theCursor integer default dbms_sql.open_cursor;
10 begin
11 dbms_sql.parse( l_theCursor, p_query, dbms_sql.native );
12 dbms_sql.describe_columns( c => l_theCursor,
13 col_cnt => l_colCnt,
14 desc_t => l_descTbl );
15
16 for i in 1 .. l_colCnt
17 loop
18 dbms_output.put_line( 'Column Type:' || l_descTbl(i).col_type );
19 dbms_output.put_line( 'Max Length:' || l_descTbl(i).col_max_len );
20 dbms_output.put_line( 'Name:' || l_descTbl(i).col_name );
21 dbms_output.put_line( 'Name Length:' || l_descTbl(i).col_name_len );
22 dbms_output.put_line( 'ObjColumn Schema Name.' || l_descTbl(i).col_schema_name );
23 dbms_output.put_line( 'Schema Name Length:' || l_descTbl(i).col_schema_name_len );
24 dbms_output.put_line( 'Precision:' || l_descTbl(i).col_precision );
25 dbms_output.put_line( 'Scale:' || l_descTbl(i).col_scale );
26 dbms_output.put_line( 'Charsetid:' || l_descTbl(i).col_Charsetid );
27 dbms_output.put_line( 'Charset Form:' || l_descTbl(i).col_charsetform );
28 if ( l_desctbl(i).col_null_ok ) then
29 dbms_output.put_line( 'Nullable:Y' );
30 else
31 dbms_output.put_line( 'Nullable:N' );
32 end if;
33 end loop;
34 dbms_sql.close_cursor(l_theCursor);
35 exception
36 when others then dbms_sql.close_cursor( l_theCursor );
37 raise;
38 end desc_query;
39 /
Procedure created.
SQL>
SQL> set serveroutput on
SQL> exec desc_query( 'select rowid, ename from emp' );
Column Type:11
Max Length:16
Name:ROWID
Name Length:5
ObjColumn Schema Name.
Schema Name Length:0
Precision:0
Scale:0
Charsetid:0
Charset Form:0
Nullable:N
Column Type:1
Max Length:10
Name:ENAME
Name Length:5
ObjColumn Schema Name.
Schema Name Length:0
Precision:0
Scale:0
Charsetid:178
Charset Form:1
Nullable:Y
PL/SQL procedure successfully completed.
SQL>
SQL> drop table emp;
Table dropped.
SQL>
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