How do I obtain column names and types?

I am using Visual Studio C++ to connect and query an Oracle database using SQL commands. My code works, but I don't fully understand it because I'm new to Oracle and it is modified example code.
I need to obtain column names and types for a known table. The "Describe" SQL command fails when I call ->Execute, claiming this is an invalid SQL statement, although the same statement works when sent directly via sqlplus.
I need column names and types, but they don't have to come through Describe.

Hi,
Desc isn't really a SQL command. Rather its a command specific to Oracle. Thats why it will work in SQLPlus and not anywhere else. If you want the column information for a table you can user either the user_tab_columns or all_tab_columns, depending on which schema the table is in. The query would look like:
select * from all_tab_columns where table_name = 'BONUS'
Sanjay

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Any help is highly appricatable
Thanks & Regards
Srikkanth.M

2 solutions by Michaels (the latter is 11g upwards only)...
michaels> var val varchar2(5)
michaels> exec :val := 'as'
PL/SQL procedure successfully completed.
michaels> select distinct substr (:val, 1, 11) "Searchword",
                substr (table_name, 1, 14) "Table",
                substr (t.column_value.getstringval (), 1, 50) "Column/Value"
           from cols,
                table
                   (xmlsequence
                       (dbms_xmlgen.getxmltype ('select ' || column_name
                                                || ' from ' || table_name
                                                || ' where upper('
                                                || column_name
                                                || ') like upper(''%' || :val
                                                || '%'')'
                                               ).extract ('ROWSET/ROW/*')
                   ) t
--        where table_name in ('EMPLOYEES', 'JOB_HISTORY', 'DEPARTMENTS')
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SQL> select table_name,
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       :search_string search_string,
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from cols,
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       columns result varchar2(10) path '.'
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DEPT                 DNAME                ES                   RESEARCH
DEPT                 DNAME                ES                   SALES
EMP                  ENAME                ES                   JONES
EMP                  ENAME                ES                   JAMES
EMP                  JOB                  ES                   SALESMAN
EMP                  JOB                  ES                   SALESMAN
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How to get the column name and table name with value

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I have one difficult requirement
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Searching all the database for a word...
Courtesy of michaels...
michaels> var val varchar2(5)
michaels> exec :val := 'as'
PL/SQL procedure successfully completed.
michaels> select distinct substr (:val, 1, 11) "Searchword",
                substr (table_name, 1, 14) "Table",
                substr (t.column_value.getstringval (), 1, 50) "Column/Value"
           from cols,
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                       (dbms_xmlgen.getxmltype ('select ' || column_name
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                                                || ' where upper('
                                                || column_name
                                                || ') like upper(''%' || :val
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                   ) t
--        where table_name in ('EMPLOYEES', 'JOB_HISTORY', 'DEPARTMENTS')
       order by "Table"or
11g upwards
SQL> select table_name,
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from (select column_name,
               table_name,
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begin
dbms_xmlschema.registerSchema(
    schemaURL       => 'my_schema.xsd'
, schemaDoc       => xmltype(bfilename('TEST_DIR','my_schema.xsd'), nls_charset_id('AL32UTF8'))
, local           => true
, genTypes        => false
, genTables       => true
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2 from user_xml_tables
3 where xmlschema = 'my_schema.xsd'
4 and element_name = 'employee';
TABLE_NAME
employee1121_TAB
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<?xml version="1.0" encoding="UTF-8" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdb="http://xmlns.oracle.com/xdb">
<xs:element name="employee" xdb:defaultTable="EMPLOYEE_XML">
    <xs:complexType>
Next step : create a resource, or just directly insert an XML document into the table.
Example of creating a resource :
declare
res boolean;
doc xmltype := xmltype(
'<employee>
<details>
    <emp_id>1</emp_id>
    <emp_name>SMITH</emp_name>
    <emp_age>40</emp_age>
    <emp_dept>10</emp_dept>
</details>
</employee>'
begin
res := dbms_xdb.CreateResource(
           abspath   => '/public/test.xml'
         , data      => doc
         , schemaurl => 'my_schema.xsd'
         , elem      => 'employee'
end;
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It could also be achieved if the document possesses an xsi:noNamespaceSchemaLocation attribute :
SQL> declare
2
3    res boolean;
4    doc xmltype := xmltype(
5 '<employee xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
6             xsi:noNamespaceSchemaLocation="my_schema.xsd">
7    <details>
8      <emp_id>1</emp_id>
9      <emp_name>SMITH</emp_name>
10      <emp_age>40</emp_age>
11      <emp_dept>10</emp_dept>
12    </details>
13   </employee>'
14   );
15
16 begin
17    res := dbms_xdb.CreateResource(
18             abspath   => '/public/test.xml'
19           , data      => doc
20           );
21 end;
22 /
PL/SQL procedure successfully completed
SQL> set long 5000
SQL> select * from "employee1121_TAB";
SYS_NC_ROWINFO$
<employee xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceS
<details>
    <emp_id>1</emp_id>
    <emp_name>SMITH</emp_name>
    <emp_age>40</emp_age>
    <emp_dept>10</emp_dept>
</details>
</employee>
Then use XMLTABLE to shred the XML into relational format :
SQL> select x.*
2 from "employee1121_TAB" t
3     , xmltable('/employee/details'
4         passing t.object_value
5         columns emp_id   integer      path 'emp_id'
6               , emp_name varchar2(30) path 'emp_name'
7       ) x
8 ;
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Give small example on ...
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like
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import java.sql.DriverManager;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.SQLException;
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                    db_userid, db_password);
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SQL> desc emp
Nome                   Nullo?   Tipo
EMPNO                  NOT NULL NUMBER(4)
ENAME                           VARCHAR2(10)
JOB                             VARCHAR2(9)
MGR                             NUMBER(4)
HIREDATE                        DATE
SAL                             NUMBER(7,2)
COMM                            NUMBER(7,2)
DEPTNO                          NUMBER(2)
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EMPNO                  NOT NULL NUMBER(4)
ENAME                           VARCHAR2(10)
MGR                             VARCHAR2(10)
HIREDATE                        DATE
SAL                             NUMBER(7,2)
COMM                            NUMBER(7,2)
DEPTNO                          NUMBER(2)
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SQL> with t1 as
2 (select column_name, data_type from user_tab_columns where table_name='EMP'),
3 t2 as
4 (select column_name, data_type from user_tab_columns where table_name='EMP2')
5 Select a.column_name, a.data_type, b.column_name, b.data_type
6 from t1 a full outer join t2 b on a.column_name=b.column_name;
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Selezionate 9 righe.Max
http://oracleitalia.wordpress.com
Edited by: Massimo Ruocchio on Feb 21, 2010 1:27 AM
Changed query.

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TYPE ref_csr IS REF CURSOR;
insert_csr ref_csr;
v_select VARCHAR2 (4000) := NULL;
v_table VARCHAR2 (4000) := NULL;
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Edited by: kumar0828 on Feb 7, 2013 10:40 PM
Edited by: kumar0828 on Feb 7, 2013 10:42 PM

>
I Built the statement as required but i need the column list because the first column value of each row should be inserted into one more table.
So i was asking how to fetch the column list in a ref cursor so that value can be inserted in one more table.
>
Then add a RETURNING INTO clause to the query to have Oracle return the first column values into a collection.
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www.project-systems.co.nz

How do I obtain column names and types?

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