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8.7

Oracle JOIN

Asked by aman0711 in Java Programming Language, Oracle Database, New to Java Programming

Tags: Java, Oracle

Hi Experts,

With all your help I have made much progress with this task.
              Now I am at the last step :)

              So the requirement was to show every user that logged on to
              the website for a given time frame along with number of times
              he logged in.

              So as suggested by all the experts here, I created a small table
              with 2 Fields, ID and LOGIN_DATE.
              A new record is inserted everytime a user logs in.

              Now with the attached code and query, I am able to display
              ID, LAST_LOGIN and COUNT on my page, but actual requirement is to
              show users name as well.

              I have another table called USER_DETAILS which contains user's fname and
              last name along with the ID.

              How do I modify my present query to make use of JOIN to get First Name
              and last Name returned with this query.

              Hope I explained it well.

Query:

SELECT id, to_char(login_date, 'MM/DD/YYYY'), cnt FROM (SELECT id, login_date, ROW_NUMBER() OVER (PARTITION BY id ORDER BY login_date DESC) rn,
COUNT( * ) OVER (PARTITION BY id) cnt FROM siweb_login_history WHERE TRUNC(login_date) BETWEEN TO_DATE('2009-11-01', 'yyyy-mm-dd')
AND TO_DATE('2009-11-04', 'yyyy-mm-dd')) WHERE rn = 1

Get your answer NOW

         
           
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             package com.si.admin; 
import java.sql.*;
import java.sql.Date;
import java.util.*;
import java.text.*; 
import com.si.admin.*;
import com.si.dao.DbConn; 
public class TrackingTable {
	
	//prod
	String url = "jdbc:oracle:thin:@xyz122.abc.com:1522:T02";
	String user = "User1";
	String password = "pass1";
	String driver = "oracle.jdbc.driver.OracleDriver"; 

	 Connection conn= null;
     PreparedStatement pstmt = null;
     Statement stmt = null;
 	 ResultSet rs = null;
	
     DbConn db = null;
	    static String details;
		     
	     public Vector<Track> getUserDetails(Track tr) {
	      	   
	    	 String fromDate, toDate;
		 	    	
		    	fromDate = tr.getFromDate();
		    	toDate = tr.getToDate();
		    	
		    	DateFormat formatter;
		    	
				java.util.Date tDate, fDate=null;
				java.sql.Date sqlTDate=null; 
				java.sql.Date sqlFDate=null;
				
		    	 formatter = new SimpleDateFormat("MM/dd/yyyy");
		    	      try {
		    	    	  tDate= (java.util.Date)formatter.parse(toDate);
						   sqlTDate = new java.sql.Date(tDate.getTime());
						   
						   fDate= (java.util.Date)formatter.parse(fromDate);
						   sqlFDate = new java.sql.Date(fDate.getTime());
						 
						} catch (ParseException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
	    	    	   
	    	    Track track;
	    	 	     	
	            Vector<Track> trackVec = new Vector<Track>();
	    	    
	String qry = "SELECT id, to_char(login_date, 'MM/DD/YYYY'), cnt FROM (SELECT id, login_date, ROW_NUMBER() OVER (PARTITION BY id ORDER BY login_date DESC) rn," +
				 "COUNT( * ) OVER (PARTITION BY id) cnt FROM siweb_login_history " +
				 "WHERE TRUNC(login_date) BETWEEN TO_DATE('"+ sqlFDate +"', 'yyyy-mm-dd')" +
				 "AND TO_DATE('" + sqlTDate +"', 'yyyy-mm-dd')) WHERE rn = 1 ";
	
	   System.out.println("user query: " + qry);
	    	      
	    	     try {
	    	    	db = new DbConn();
	       		    Class.forName(driver);
	       		    conn = DriverManager.getConnection(url, user, password); 
	    	        	    	 
					pstmt = conn.prepareStatement(qry);
					
					rs = pstmt.executeQuery(qry);
					
					while (rs.next()) {
						
						track = new Track();
						
						track.setId(rs.getString(1));
						track.setLastLogin(rs.getString(2));
						track.setCount(rs.getString(3));
												
						trackVec.add(track);	
																							
						}
							
				  } catch (SQLException e) {
					// TODO Auto-generated catch block
				    	e.printStackTrace();
			      	} catch (ClassNotFoundException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} finally {
					           try {
					        	   pstmt.close();
					        	   rs.close();
					        	   conn.close();
					           } catch (Exception e) {
					        	   e.printStackTrace();
					           }
					
			      	}
			   	
			      	return trackVec;
				
	       }
	     
	     public static void main(String args[]) {
	    	 
	    	 System.out.println("detailsssss" + details);
	  	    	 
	     }
	
	
  } 
		   

           
         

Oracle JOIN

Asked by aman0711 in Java Programming Language, Oracle Database, New to Java Programming

Tags: Java, Oracle

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