( Urgent ) Date Formatting

Question

I want to know how to get a date value with Milliseconds by using Date Format or any.
For Eg: I am having a LOG( Transactions) table wherein I have a date_create column of a DATE Datatype.
I want to get( Display or retrieve) the value in Milliseconds after formatting. Is there anyway out.
Does ORACLE provide that..
Thanks in Advance for your Response..
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Answer 1

2 solutions:
1) write a java stored procedure. java has time functionality
that is much more granular then the Oracle DATE type. This will
work in 8.1.5 and up. It can look like this:
[email protected]> CREATE or replace JAVA SOURCE
2 NAMED "MyTimestamp"
3 AS
4 import java.lang.String;
5 import java.sql.Timestamp;
6
7 public class MyTimestamp
8 {
9 public static String getTimestamp()
10 {
11 return (new
12 Timestamp(System.currentTimeMillis())).toString();
13 }
14 };
15 /
Java created.
[email protected]> create or replace function my_timestamp
return varchar2
2 AS LANGUAGE JAVA
3 NAME 'MyTimestamp.getTimestamp() return java.lang.String';
4 /
Function created.
[email protected]> l
1* select my_timestamp, to_char(sysdate,'yyyy-mm-dd
hh24:mi:ss') from dual
[email protected]> /
MY_TIMESTAMP
TO_CHAR(SYSDATE,'YY
2000-06-22 13:47:53.376
2000-06-22 13:47:53
[email protected]>
2) use an external procedure written in C. C has api's to the
system that allow for much more granular time components. This
will work in 8.0 and up. For example if you run something like:
[email protected]> create or replace library timelib as
2 '/export/home/tkyte/src/t/extproc.so'
3 /
Library created.
[email protected]> create or replace
2 procedure get_extended_time( p_timestring out varchar2 )
3 is external
4 name "get_extended_time"
5 library timelib
6 language C
7 with context
8 parameters ( CONTEXT,
9 p_timestring STRING,
10 p_timestring INDICATOR short,
11 p_timestring MAXLEN int,
12 p_timestring LENGTH int );
13
14 /
Procedure created.
[email protected]> declare
2 l_timestring varchar2(30);
3 begin
4 get_extended_time( l_timestring );
5 dbms_output.put_line(
to_char( sysdate, 'mm/dd/yy hh24:mi:ss' ) );
6 dbms_output.put_line( l_timestring );
7 end;
8 /
06/22/00 13:26:28
06/22/00 13:26:28.103243
PL/SQL procedure successfully completed.
In sqlplus after compiling the following C code into a .so or
.dll or .sl (depending on platform) you can get the
milliseconds.
Here is the C code:
#include <stdio.h>
#include <stdarg.h>
#include <time.h>
#ifndef OCI_ORACLE
# include <oci.h>
#endif
#define raise_application_error return raise_application_error_x
static long raise_application_error_x( OCIExtProcContext * ctx,
int errCode,
char * errMsg, ...)
char msg[8192];
va_list ap;
va_start(ap,errMsg);
vsprintf( msg, errMsg, ap );
va_end(ap);
OCIExtProcRaiseExcpWithMsg(ctx,errCode,msg,strlen(msg));
return -1;
long
get_extended_time( OCIExtProcContext * ctx,
char * p_data,
short * p_data_i,
int * p_data_maxl,
int * p_data_l )
struct timeval tp;
if ( *p_data_maxl < 25 )
raise_application_error( ctx, 20001,
"String must be 25 bytes or more" );
gettimeofday(&tp, NULL);
cftime( p_data, "%D %T", &tp.tv_sec );
sprintf( p_data+strlen(p_data), ".%d", tp.tv_usec );
*p_data_l = strlen(p_data);
*p_data_i = 0;
return 0;
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