How to retrieve the last 5 accessed record ??
How to retrieve the last 5 accessed record ??
I am using a field for storing the accessed time.
Pls help with regard to this.
Thanks in Advance.
JG
Depending on your used databasee version, there are several options available, here are just a few examples:
Sorted Inline-Views & rownum:
SELECT *
FROM (SELECT *
FROM user_objects
ORDER BY timestamp desc)
WHERE ROWNUM <= 5;
;Inline-View with analytic function:
SELECT *
FROM (SELECT uo.*, ROW_NUMBER() OVER (ORDER BY timestamp desc) rn
FROM user_objects uo
WHERE rn <= 5;
;C.
Similar Messages
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HELP! How te retrieve the last row in MYSQL database using Servlet!
Hi ,
I am new servlets. I am trying to retireve the last row id inserted using the servlet.
Could someone show me a working sample code on how to retrieve the last record inserted?
Thanks
MY CODE
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class demo_gr extends HttpServlet {
//***** Servlet access to data base
public void doPost (HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
String url = "jdbc:mysql://sql2.njit.edu/ki3_proj";
String param1 = req.getParameter("param1");
PrintWriter out = resp.getWriter();
resp.setContentType("text/html");
String semail, sfname, slname, rfname, rlname, remail, message;
int cardType;
sfname = req.getParameter("sfname");
slname = req.getParameter("slname");
rfname = req.getParameter("rfname");
rlname = req.getParameter("rlname");
semail = req.getParameter("semail");
remail = req.getParameter("remail");
message = req.getParameter("message");
//cardType = req.getParameter("cardType");
cardType = Integer.parseInt(req.getParameter("cardType"));
out.println(" param1 " + param1 + "\n");
String query = "SELECT * FROM greeting_db "
+ "WHERE id =" + param1 + "";
String query2 ="INSERT INTO greeting_db (sfname, slname ,semail , rfname , rlname , remail , message , cardType ,sentdate ,vieweddate) values('";
query2 = query2 + sfname +"','"+ slname + "','"+ semail + "','"+ rfname + "','"+ rlname + "','"+ remail + "','"+ message + "','"+ cardType + "',NOW(),NOW())";
//out.println(" query2 " + query2 + "\n");
if (semail.equals("") || sfname.equals("") ||
slname.equals("") || rfname.equals("") ||
rlname.equals("") || remail.equals("") ||
message.equals(""))
out.println("<h3> Please Click the back button and fill in <b>all</b> fields</h3>");
out.close();
return;
String title = "Your Card Has Been Sent";
out.println("<BODY>\n" +
"<H1 ALIGN=CENTER>" + title + "</H1>\n" );
out.println("\n" +
"\n" +
" From " + sfname + ", " + slname + "\n <br> To "
+ rfname + ", " + rlname + "\n <br>Receiver Email " + remail + "\n<br> Your Message "
+ message + "\n<br> <br> :");
if (cardType ==1)
out.println("<IMG SRC=/WEB-INF/images/bentley.jpg>");
else if(cardType ==2) {
out.println("<IMG SRC=/WEB-INF/images/Bugatti.jpg>");
else if(cardType ==3) {
out.println(" <IMG SRC=/WEB-INF/images/castle.jpg>");
else if(cardType ==4) {
out.println(" <IMG SRC=/WEB-INF/images/motocross.jpg>");
else if(cardType ==5) {
out.println(" <IMG SRC=/WEB-INF/images/Mustang.jpg>");
else if(cardType ==6) {
out.println("<IMG SRC=/WEB-INF/images/Mustang.jpg>");
out.println("</BODY></HTML>");
try {
Class.forName ("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection
( url, "*****", "******" );
Statement stmt = con.createStatement ();
stmt.execute (query2);
//String query3 = "SELECT LAST_INSERT_ID()";
//ResultSet rs = stmt.executeQuery (query3);
//int questionID = rs.getInt(1);
System.out.println("Total rows:"+questionID);
stmt.close();
con.close();
} // end try
catch (SQLException ex) {
//PrintWriter out = resp.getWriter();
resp.setContentType("text/html");
while (ex != null) {
out.println ("SQL Exception: " + ex.getMessage ());
ex = ex.getNextException ();
} // end while
} // end catch SQLException
catch (java.lang.Exception ex) {
//PrintWriter out = resp.getWriter();
resp.setContentType("text/html");
out.println ("Exception: " + ex.getMessage ());
} // end doGet
private void printResultSet ( HttpServletResponse resp, ResultSet rs )
throws SQLException {
try {
PrintWriter out = resp.getWriter();
out.println("<html>");
out.println("<head><title>jbs jdbc/mysql servlet</title></head>");
out.println("<body>");
out.println("<center><font color=AA0000>");
out.println("<table border='1'>");
int numCols = rs.getMetaData().getColumnCount ();
while ( rs.next() ) {
out.println("<tr>");
for (int i=1; i<=numCols; i++) {
out.print("<td>" + rs.getString(i) + "</td>" );
} // end for
out.println("</tr>");
} // end while
out.println("</table>");
out.println("</font></center>");
out.println("</body>");
out.println("</html>");
out.close();
} // end try
catch ( IOException except) {
} // end catch
} // end returnHTML
} // end jbsJDBCServletI dont know what table names and fields you have but
say you have a table called XYZ which has a primary
key field called keyID.
So in order to get the last row inserted, you could
do something like
Select *
from XYZ
where keyID = (Select MAX(keyID) from XYZ);
Good Luckwhat gubloo said is correct ...But this is all in MS SQL Server I don't know the syntax and key words in MYSQL
This works fine if the emp_id is incremental and of type integer
Query:
select *
from employee e, (select max(emp_id) as emp_id from employee) z
where e.emp_id = z.emp_id
or
select top 1 * from employee order by emp_id descUday -
How to retrieve the Last sequence value of a sequence ?
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Rajesh Lathwal wrote:
Last Number Selected From Sequence :
SELECT sequence_name, last_number
FROM user_sequences;That's wrong, this is taking the CACHE in account :
SQL> create sequence seq ;
Sequence created.
SQL> select seq.nextval from dual;
NEXTVAL
1
SQL> SELECT sequence_name, last_number
2 FROM user_sequences where sequence_name='SEQ';
SEQUENCE_NAME LAST_NUMBER
SEQ 21
SQL> select seq.currval from dual;
CURRVAL
1
SQL>Nicolas. -
How to get the last time a record was modified or created ?
Is there a way (hidden system fields for example, system view, other ?) to get the last time a record of a table was modified or the date it was created.
Thanks for any help.
Stiphane CAMPIONblarman74 wrote:
I know I could do this with a trigger, but I was wondering if there is a data dictionary view I can query to find the date/time a table was last updated. What I have is a table that is constantly getting hammered with new data being uploaded from a third party. We need to keep close tabs to verify that this datafeed is constantly running and bringing in new data. Because the data that comes in comes from multiple timezones and there are hundreds of lines, our attempts at monitoring by just looking at the data leave something to be desired.
Any ideas?refer this links
How to find Last modified/updated time of a particular table
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1590655700346557237
Thanks -
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This may be a question with a very known answer but I couldn't find any within this forum.
What is the proper way to retrieve the just inserted record ?
I'm accessing the DB from external Java and at this moment I use a timestamp column in order to retrieve the inserted row. So I generate an unique timestamp ('20020615184524356') which I inserted during the insert operation. I retrieve the just inserted row using "select * from fooTable where(timestamp='20020615184524356')".
Is this the general idea or am I totally wrong ?hi Shaik Khaleel,
Just wanted to clarify my doubts regarding rowid.
Please refer the subject as "abt rowid" in previous posting and ur reply for that was
"its an unique number throughout the database, its an hexadecimal number. it assigns the rowid of the deleted row in future , but not to the immediate insertation row."
As u have mentioned the rowid of the deleted row can be assigned to a new row in future,
wont the following query fail.
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Hi,
Oracle 10g, FGA - Fine grained auditing, supports DML statements (9i only select).
Set up FGA using the DBMS_FGA.ADD_POLICY procudure:
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audit_column => SALARY',
audit_condition => '',
statement_type => 'UPDATE');
END;
NEXT:
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SQL> desc fga_log$
Name Null? Type
SESSIONID NOT NULL NUMBER
TIMESTAMP# DATE
DBUID VARCHAR2(30)
OSUID VARCHAR2(255)
OSHST VARCHAR2(128)
CLIENTID VARCHAR2(64)
EXTID VARCHAR2(4000)
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OBJ$NAME VARCHAR2(128)
POLICYNAME VARCHAR2(30)
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LSQLTEXT CLOB
SQLBIND VARCHAR2(4000)
COMMENT$TEXT VARCHAR2(4000)
PLHOL LONG
STMT_TYPE NUMBER
NTIMESTAMP# TIMESTAMP(6)
PROXY$SID NUMBER
USER$GUID VARCHAR2(32)
INSTANCE# NUMBER
PROCESS# VARCHAR2(16)
XID RAW(8)
AUDITID VARCHAR2(64)
STATEMENT NUMBER
ENTRYID NUMBER
DBID NUMBER
LSQLBIND CLOB
SQL> spool off -
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How to find the last update date time and user of record field peoplecode
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>
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