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Natural Left Join of tables using DBCP

This tutorial demonstrate natural left join of the tables using DBCP.


import java.sql.*;
import org.apache.commons.dbcp.BasicDataSource;

public class NaturalLeftJoin {
  public static void main(String[] args) {
    BasicDataSource bds = new BasicDataSource();
    try {
      Connection con = bds.getConnection();
      try {
        Statement st = con.createStatement();
        ResultSet res = st.executeQuery("SELECT *FROM " "employee"
        " NATURAL LEFT JOIN " "salary");
        System.out.println("Emp_name" "\t" "Emp_sal");
        while ( {
          String name = res.getString("emp_name");
          int sal1 = res.getInt("sal");
          System.out.println(name + "\t\t" + sal1);
      catch (SQLException s) {
        System.out.println("SQL statement is not executed!");
    catch (Exception e) {

Before running this program you need to make two tables. Below shown two tables and record stored in it.



Directory structure of files:

In the lib folder place all required jar files ie. commons-collections.jar, commons-dbcp.jar, commons-pool.jar, j2ee.jar and mysql-connector-java-5.1.7-bin.jar

In the pathset.bat write following statement

set classpath=.;lib/commons-collections.jar;lib/commons-dbcp.jar;lib/commons-pool.jar;lib/j2ee.jar;lib/mysql-connector-java-5.1.7-bin.jar



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