Question

Deleting a row in a table based on the conditon whose data type is clob

Asked by: chaituu

Hi ,
i want to delete a row from a table where my column name is CLOB type.

when i proceeded like this it gave me ORA :00932 error (inconsistent Data Type)

delete from sailors where notespart ='socrates notes ';
here notespart is clob data type

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Asked On
2006-02-22 at 03:21:19ID21746635
Tags

data

,

delete

,

table

Topic

Oracle Database

Participating Experts
4
Points
500
Comments
4

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Answers

 

by: angelIIIPosted on 2006-02-22 at 03:22:23ID: 16017606

see here how it can be done (ie with a parametrized query):
http://forum.java.sun.com/thread.jspa?threadID=349880&start=15

 

by: ivostoykovPosted on 2006-02-22 at 03:53:39ID: 16017761

Hi chaituu,

>
you cannot use clob in where clause directly. You have to use a function for that.
Here is a sample function and a simple sample who to use it (into usage comment :-).

/*
 * usage:
 *  SELECT getlong('User_Views', 'text', ROWID)AS t, v.* FROM User_Views v
 *  WHERE getlong('User_Views', 'text', ROWID) LIKE '%month%'
*/
CREATE OR REPLACE FUNCTION getlong(p_tname IN VARCHAR2, p_cname IN VARCHAR2, p_rowid IN ROWID)
  RETURN VARCHAR2 AS
  l_cursor   INTEGER DEFAULT dbms_sql.open_cursor;
  l_n        NUMBER;
  l_long_val VARCHAR2(4000);
  l_long_len NUMBER;
  l_buflen   NUMBER := 4000;
  l_curpos   NUMBER := 0;
BEGIN
  dbms_sql.parse(l_cursor
                ,'select ' || p_cname || ' from ' || p_tname || ' where rowid = :x'
                ,dbms_sql.native);
  dbms_sql.bind_variable(l_cursor, ':x', p_rowid);

  dbms_sql.define_column_long(l_cursor, 1);
  l_n := dbms_sql.EXECUTE(l_cursor);

  IF (dbms_sql.fetch_rows(l_cursor) > 0) THEN
    dbms_sql.column_value_long(l_cursor, 1, l_buflen, l_curpos, l_long_val, l_long_len);
  END IF;
  dbms_sql.close_cursor(l_cursor);
  RETURN l_long_val;
END getlong;
/


HTH

I

 

by: JankovskyPosted on 2006-02-22 at 06:42:42ID: 16019329

delete from sailors where dbms_lob.instr(notespart,'socrates notes')=1

 

by: ram_0218Posted on 2006-02-22 at 07:12:51ID: 16019653

There are two things. Either you want to use a LIKE operator or you'r using a equal operator. Since you'r using an '=' operator I assume that your clob data is what you'r trying to match.

Simply you can write this procedure and it will work.

delete from sailors where to_char(notespart) ='socrates notes ';

Lets test this,

SQL> create table c8(c clob);

Table created.

SQL> insert into c8 values('abc');

1 row created.
SQL> insert into c8 values('def');

1 row created.
SQL>  delete from c8 where to_char(c)='abc';

1 row deleted.

SQL> select * from c8;

C
---------------------------------
def

20120131-EE-VQP-002

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